From 25621bcc89762fe1329ae9c9dab75bc70ef1aee0 Mon Sep 17 00:00:00 2001
From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Date: Thu, 3 Nov 2022 16:57:43 +0100
Subject: HID: Kconfig: split HID support and hid-core compilation

Currently, we step into drivers/hid/ based on the value of
CONFIG_HID.

However, that value is a tristate, meaning that it can be a module.

As per the documentation, if we jump into the subdirectory by
following an obj-m, we can not compile anything inside that
subdirectory in vmlinux. It is considered as a bug.

To make things more friendly to HID-BPF, split HID (the HID core
parameter) from HID_SUPPORT (do we want any kind of HID support in the
system?), and make this new config a boolean.

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
 drivers/Makefile                |  2 +-
 drivers/hid/Kconfig             | 16 +++++++++++-----
 drivers/hid/amd-sfh-hid/Kconfig |  2 +-
 3 files changed, 13 insertions(+), 7 deletions(-)

(limited to 'drivers')

diff --git a/drivers/Makefile b/drivers/Makefile
index bdf1c66141c9..cf5d8b86da8f 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -137,7 +137,7 @@ obj-$(CONFIG_CRYPTO)		+= crypto/
 obj-$(CONFIG_SUPERH)		+= sh/
 obj-y				+= clocksource/
 obj-$(CONFIG_DCA)		+= dca/
-obj-$(CONFIG_HID)		+= hid/
+obj-$(CONFIG_HID_SUPPORT)	+= hid/
 obj-$(CONFIG_PPC_PS3)		+= ps3/
 obj-$(CONFIG_OF)		+= of/
 obj-$(CONFIG_SSB)		+= ssb/
diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index 185a077d59cd..72bbf9899993 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -2,12 +2,18 @@
 #
 # HID driver configuration
 #
-menu "HID support"
-     depends on INPUT
+menuconfig HID_SUPPORT
+	bool "HID bus support"
+	default y
+	depends on INPUT
+	help
+	  This option adds core support for human interface device (HID).
+	  You will also need drivers from the following menu to make use of it.
+
+if HID_SUPPORT
 
 config HID
-	tristate "HID bus support"
-	depends on INPUT
+	tristate "HID bus core support"
 	default y
 	help
 	  A human interface device (HID) is a type of computer device that
@@ -1290,4 +1296,4 @@ source "drivers/hid/amd-sfh-hid/Kconfig"
 
 source "drivers/hid/surface-hid/Kconfig"
 
-endmenu
+endif # HID_SUPPORT
diff --git a/drivers/hid/amd-sfh-hid/Kconfig b/drivers/hid/amd-sfh-hid/Kconfig
index db069a83e9a2..56e473fc3c93 100644
--- a/drivers/hid/amd-sfh-hid/Kconfig
+++ b/drivers/hid/amd-sfh-hid/Kconfig
@@ -2,10 +2,10 @@
 menu "AMD SFH HID Support"
 	depends on X86_64 || COMPILE_TEST
 	depends on PCI
-	depends on HID
 
 config AMD_SFH_HID
 	tristate "AMD Sensor Fusion Hub"
+	select HID
 	help
 	  If you say yes to this option, support will be included for the
 	  AMD Sensor Fusion Hub.
-- 
cgit v1.2.3


From f5c27da4e3c8a2e42fb4f41a0c685debcb9af294 Mon Sep 17 00:00:00 2001
From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Date: Thu, 3 Nov 2022 16:57:44 +0100
Subject: HID: initial BPF implementation

Declare an entry point that can use fmod_ret BPF programs, and
also an API to access and change the incoming data.

A simpler implementation would consist in just calling
hid_bpf_device_event() for any incoming event and let users deal
with the fact that they will be called for any event of any device.

The goal of HID-BPF is to partially replace drivers, so this situation
can be problematic because we might have programs which will step on
each other toes.

For that, we add a new API hid_bpf_attach_prog() that can be called
from a syscall and we manually deal with a jump table in hid-bpf.

Whenever we add a program to the jump table (in other words, when we
attach a program to a HID device), we keep the number of time we added
this program in the jump table so we can release it whenever there are
no other users.

HID devices have an RCU protected list of available programs in the
jump table, and those programs are called one after the other thanks
to bpf_tail_call().

To achieve the detection of users losing their fds on the programs we
attached, we add 2 tracing facilities on bpf_prog_release() (for when
a fd is closed) and bpf_free_inode() (for when a pinned program gets
unpinned).

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
 drivers/hid/Kconfig                             |   2 +
 drivers/hid/Makefile                            |   2 +
 drivers/hid/bpf/Kconfig                         |  17 +
 drivers/hid/bpf/Makefile                        |  11 +
 drivers/hid/bpf/entrypoints/Makefile            |  93 ++++
 drivers/hid/bpf/entrypoints/README              |   4 +
 drivers/hid/bpf/entrypoints/entrypoints.bpf.c   |  66 +++
 drivers/hid/bpf/entrypoints/entrypoints.lskel.h | 648 ++++++++++++++++++++++++
 drivers/hid/bpf/hid_bpf_dispatch.c              | 223 ++++++++
 drivers/hid/bpf/hid_bpf_dispatch.h              |  27 +
 drivers/hid/bpf/hid_bpf_jmp_table.c             | 568 +++++++++++++++++++++
 drivers/hid/hid-core.c                          |  21 +
 12 files changed, 1682 insertions(+)
 create mode 100644 drivers/hid/bpf/Kconfig
 create mode 100644 drivers/hid/bpf/Makefile
 create mode 100644 drivers/hid/bpf/entrypoints/Makefile
 create mode 100644 drivers/hid/bpf/entrypoints/README
 create mode 100644 drivers/hid/bpf/entrypoints/entrypoints.bpf.c
 create mode 100644 drivers/hid/bpf/entrypoints/entrypoints.lskel.h
 create mode 100644 drivers/hid/bpf/hid_bpf_dispatch.c
 create mode 100644 drivers/hid/bpf/hid_bpf_dispatch.h
 create mode 100644 drivers/hid/bpf/hid_bpf_jmp_table.c

(limited to 'drivers')

diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index 72bbf9899993..ff40c18f4a2b 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -1284,6 +1284,8 @@ config HID_KUNIT_TEST
 
 endmenu
 
+source "drivers/hid/bpf/Kconfig"
+
 endif # HID
 
 source "drivers/hid/usbhid/Kconfig"
diff --git a/drivers/hid/Makefile b/drivers/hid/Makefile
index e8014c1a2f8b..c45b516eb767 100644
--- a/drivers/hid/Makefile
+++ b/drivers/hid/Makefile
@@ -5,6 +5,8 @@
 hid-y			:= hid-core.o hid-input.o hid-quirks.o
 hid-$(CONFIG_DEBUG_FS)		+= hid-debug.o
 
+obj-$(CONFIG_HID_BPF)		+= bpf/
+
 obj-$(CONFIG_HID)		+= hid.o
 obj-$(CONFIG_UHID)		+= uhid.o
 
diff --git a/drivers/hid/bpf/Kconfig b/drivers/hid/bpf/Kconfig
new file mode 100644
index 000000000000..298634fc3335
--- /dev/null
+++ b/drivers/hid/bpf/Kconfig
@@ -0,0 +1,17 @@
+# SPDX-License-Identifier: GPL-2.0-only
+menu "HID-BPF support"
+
+config HID_BPF
+	bool "HID-BPF support"
+	default HID_SUPPORT
+	depends on BPF && BPF_SYSCALL
+	help
+	This option allows to support eBPF programs on the HID subsystem.
+	eBPF programs can fix HID devices in a lighter way than a full
+	kernel patch and allow a lot more flexibility.
+
+	For documentation, see Documentation/hid/hid-bpf.rst
+
+	If unsure, say Y.
+
+endmenu
diff --git a/drivers/hid/bpf/Makefile b/drivers/hid/bpf/Makefile
new file mode 100644
index 000000000000..cf55120cf7d6
--- /dev/null
+++ b/drivers/hid/bpf/Makefile
@@ -0,0 +1,11 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for HID-BPF
+#
+
+LIBBPF_INCLUDE = $(srctree)/tools/lib
+
+obj-$(CONFIG_HID_BPF) += hid_bpf.o
+CFLAGS_hid_bpf_dispatch.o += -I$(LIBBPF_INCLUDE)
+CFLAGS_hid_bpf_jmp_table.o += -I$(LIBBPF_INCLUDE)
+hid_bpf-objs += hid_bpf_dispatch.o hid_bpf_jmp_table.o
diff --git a/drivers/hid/bpf/entrypoints/Makefile b/drivers/hid/bpf/entrypoints/Makefile
new file mode 100644
index 000000000000..a12edcfa4fe3
--- /dev/null
+++ b/drivers/hid/bpf/entrypoints/Makefile
@@ -0,0 +1,93 @@
+# SPDX-License-Identifier: GPL-2.0
+OUTPUT := .output
+abs_out := $(abspath $(OUTPUT))
+
+CLANG ?= clang
+LLC ?= llc
+LLVM_STRIP ?= llvm-strip
+
+TOOLS_PATH := $(abspath ../../../../tools)
+BPFTOOL_SRC := $(TOOLS_PATH)/bpf/bpftool
+BPFTOOL_OUTPUT := $(abs_out)/bpftool
+DEFAULT_BPFTOOL := $(BPFTOOL_OUTPUT)/bootstrap/bpftool
+BPFTOOL ?= $(DEFAULT_BPFTOOL)
+
+LIBBPF_SRC := $(TOOLS_PATH)/lib/bpf
+LIBBPF_OUTPUT := $(abs_out)/libbpf
+LIBBPF_DESTDIR := $(LIBBPF_OUTPUT)
+LIBBPF_INCLUDE := $(LIBBPF_DESTDIR)/include
+BPFOBJ := $(LIBBPF_OUTPUT)/libbpf.a
+
+INCLUDES := -I$(OUTPUT) -I$(LIBBPF_INCLUDE) -I$(TOOLS_PATH)/include/uapi
+CFLAGS := -g -Wall
+
+VMLINUX_BTF_PATHS ?= $(if $(O),$(O)/vmlinux)				\
+		     $(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux)	\
+		     ../../../../vmlinux				\
+		     /sys/kernel/btf/vmlinux				\
+		     /boot/vmlinux-$(shell uname -r)
+VMLINUX_BTF ?= $(abspath $(firstword $(wildcard $(VMLINUX_BTF_PATHS))))
+ifeq ($(VMLINUX_BTF),)
+$(error Cannot find a vmlinux for VMLINUX_BTF at any of "$(VMLINUX_BTF_PATHS)")
+endif
+
+ifeq ($(V),1)
+Q =
+msg =
+else
+Q = @
+msg = @printf '  %-8s %s%s\n' "$(1)" "$(notdir $(2))" "$(if $(3), $(3))";
+MAKEFLAGS += --no-print-directory
+submake_extras := feature_display=0
+endif
+
+.DELETE_ON_ERROR:
+
+.PHONY: all clean
+
+all: entrypoints.lskel.h
+
+clean:
+	$(call msg,CLEAN)
+	$(Q)rm -rf $(OUTPUT) entrypoints
+
+entrypoints.lskel.h: $(OUTPUT)/entrypoints.bpf.o | $(BPFTOOL)
+	$(call msg,GEN-SKEL,$@)
+	$(Q)$(BPFTOOL) gen skeleton -L $< > $@
+
+
+$(OUTPUT)/entrypoints.bpf.o: entrypoints.bpf.c $(OUTPUT)/vmlinux.h $(BPFOBJ) | $(OUTPUT)
+	$(call msg,BPF,$@)
+	$(Q)$(CLANG) -g -O2 -target bpf $(INCLUDES)			      \
+		 -c $(filter %.c,$^) -o $@ &&				      \
+	$(LLVM_STRIP) -g $@
+
+$(OUTPUT)/vmlinux.h: $(VMLINUX_BTF) $(BPFTOOL) | $(INCLUDE_DIR)
+ifeq ($(VMLINUX_H),)
+	$(call msg,GEN,,$@)
+	$(Q)$(BPFTOOL) btf dump file $(VMLINUX_BTF) format c > $@
+else
+	$(call msg,CP,,$@)
+	$(Q)cp "$(VMLINUX_H)" $@
+endif
+
+$(OUTPUT) $(LIBBPF_OUTPUT) $(BPFTOOL_OUTPUT):
+	$(call msg,MKDIR,$@)
+	$(Q)mkdir -p $@
+
+$(BPFOBJ): $(wildcard $(LIBBPF_SRC)/*.[ch] $(LIBBPF_SRC)/Makefile) | $(LIBBPF_OUTPUT)
+	$(Q)$(MAKE) $(submake_extras) -C $(LIBBPF_SRC)			       \
+		    OUTPUT=$(abspath $(dir $@))/ prefix=		       \
+		    DESTDIR=$(LIBBPF_DESTDIR) $(abspath $@) install_headers
+
+ifeq ($(CROSS_COMPILE),)
+$(DEFAULT_BPFTOOL): $(BPFOBJ) | $(BPFTOOL_OUTPUT)
+	$(Q)$(MAKE) $(submake_extras) -C $(BPFTOOL_SRC)			       \
+		    OUTPUT=$(BPFTOOL_OUTPUT)/				       \
+		    LIBBPF_BOOTSTRAP_OUTPUT=$(LIBBPF_OUTPUT)/		       \
+		    LIBBPF_BOOTSTRAP_DESTDIR=$(LIBBPF_DESTDIR)/ bootstrap
+else
+$(DEFAULT_BPFTOOL): | $(BPFTOOL_OUTPUT)
+	$(Q)$(MAKE) $(submake_extras) -C $(BPFTOOL_SRC)			       \
+		    OUTPUT=$(BPFTOOL_OUTPUT)/ bootstrap
+endif
diff --git a/drivers/hid/bpf/entrypoints/README b/drivers/hid/bpf/entrypoints/README
new file mode 100644
index 000000000000..147e0d41509f
--- /dev/null
+++ b/drivers/hid/bpf/entrypoints/README
@@ -0,0 +1,4 @@
+WARNING:
+If you change "entrypoints.bpf.c" do "make -j" in this directory to rebuild "entrypoints.skel.h".
+Make sure to have clang 10 installed.
+See Documentation/bpf/bpf_devel_QA.rst
diff --git a/drivers/hid/bpf/entrypoints/entrypoints.bpf.c b/drivers/hid/bpf/entrypoints/entrypoints.bpf.c
new file mode 100644
index 000000000000..41dd66d5fc7a
--- /dev/null
+++ b/drivers/hid/bpf/entrypoints/entrypoints.bpf.c
@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2022 Benjamin Tissoires */
+
+#include ".output/vmlinux.h"
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+
+#define HID_BPF_MAX_PROGS 1024
+
+extern bool call_hid_bpf_prog_release(u64 prog, int table_cnt) __ksym;
+
+struct {
+	__uint(type, BPF_MAP_TYPE_PROG_ARRAY);
+	__uint(max_entries, HID_BPF_MAX_PROGS);
+	__uint(key_size, sizeof(__u32));
+	__uint(value_size, sizeof(__u32));
+} hid_jmp_table SEC(".maps");
+
+struct {
+	__uint(type, BPF_MAP_TYPE_HASH);
+	__uint(max_entries, HID_BPF_MAX_PROGS * HID_BPF_PROG_TYPE_MAX);
+	__type(key, void *);
+	__type(value, __u8);
+} progs_map SEC(".maps");
+
+SEC("fmod_ret/__hid_bpf_tail_call")
+int BPF_PROG(hid_tail_call, struct hid_bpf_ctx *hctx)
+{
+	bpf_tail_call(ctx, &hid_jmp_table, hctx->index);
+
+	return 0;
+}
+
+static void release_prog(u64 prog)
+{
+	u8 *value;
+
+	value = bpf_map_lookup_elem(&progs_map, &prog);
+	if (!value)
+		return;
+
+	if (call_hid_bpf_prog_release(prog, *value))
+		bpf_map_delete_elem(&progs_map, &prog);
+}
+
+SEC("fexit/bpf_prog_release")
+int BPF_PROG(hid_prog_release, struct inode *inode, struct file *filp)
+{
+	u64 prog = (u64)filp->private_data;
+
+	release_prog(prog);
+
+	return 0;
+}
+
+SEC("fexit/bpf_free_inode")
+int BPF_PROG(hid_free_inode, struct inode *inode)
+{
+	u64 prog = (u64)inode->i_private;
+
+	release_prog(prog);
+
+	return 0;
+}
+
+char LICENSE[] SEC("license") = "GPL";
diff --git a/drivers/hid/bpf/entrypoints/entrypoints.lskel.h b/drivers/hid/bpf/entrypoints/entrypoints.lskel.h
new file mode 100644
index 000000000000..aa7b7ab31abb
--- /dev/null
+++ b/drivers/hid/bpf/entrypoints/entrypoints.lskel.h
@@ -0,0 +1,648 @@
+/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
+/* THIS FILE IS AUTOGENERATED BY BPFTOOL! */
+#ifndef __ENTRYPOINTS_BPF_SKEL_H__
+#define __ENTRYPOINTS_BPF_SKEL_H__
+
+#include <bpf/skel_internal.h>
+
+struct entrypoints_bpf {
+	struct bpf_loader_ctx ctx;
+	struct {
+		struct bpf_map_desc hid_jmp_table;
+		struct bpf_map_desc progs_map;
+	} maps;
+	struct {
+		struct bpf_prog_desc hid_tail_call;
+		struct bpf_prog_desc hid_prog_release;
+		struct bpf_prog_desc hid_free_inode;
+	} progs;
+	struct {
+		int hid_tail_call_fd;
+		int hid_prog_release_fd;
+		int hid_free_inode_fd;
+	} links;
+};
+
+static inline int
+entrypoints_bpf__hid_tail_call__attach(struct entrypoints_bpf *skel)
+{
+	int prog_fd = skel->progs.hid_tail_call.prog_fd;
+	int fd = skel_raw_tracepoint_open(NULL, prog_fd);
+
+	if (fd > 0)
+		skel->links.hid_tail_call_fd = fd;
+	return fd;
+}
+
+static inline int
+entrypoints_bpf__hid_prog_release__attach(struct entrypoints_bpf *skel)
+{
+	int prog_fd = skel->progs.hid_prog_release.prog_fd;
+	int fd = skel_raw_tracepoint_open(NULL, prog_fd);
+
+	if (fd > 0)
+		skel->links.hid_prog_release_fd = fd;
+	return fd;
+}
+
+static inline int
+entrypoints_bpf__hid_free_inode__attach(struct entrypoints_bpf *skel)
+{
+	int prog_fd = skel->progs.hid_free_inode.prog_fd;
+	int fd = skel_raw_tracepoint_open(NULL, prog_fd);
+
+	if (fd > 0)
+		skel->links.hid_free_inode_fd = fd;
+	return fd;
+}
+
+static inline int
+entrypoints_bpf__attach(struct entrypoints_bpf *skel)
+{
+	int ret = 0;
+
+	ret = ret < 0 ? ret : entrypoints_bpf__hid_tail_call__attach(skel);
+	ret = ret < 0 ? ret : entrypoints_bpf__hid_prog_release__attach(skel);
+	ret = ret < 0 ? ret : entrypoints_bpf__hid_free_inode__attach(skel);
+	return ret < 0 ? ret : 0;
+}
+
+static inline void
+entrypoints_bpf__detach(struct entrypoints_bpf *skel)
+{
+	skel_closenz(skel->links.hid_tail_call_fd);
+	skel_closenz(skel->links.hid_prog_release_fd);
+	skel_closenz(skel->links.hid_free_inode_fd);
+}
+static void
+entrypoints_bpf__destroy(struct entrypoints_bpf *skel)
+{
+	if (!skel)
+		return;
+	entrypoints_bpf__detach(skel);
+	skel_closenz(skel->progs.hid_tail_call.prog_fd);
+	skel_closenz(skel->progs.hid_prog_release.prog_fd);
+	skel_closenz(skel->progs.hid_free_inode.prog_fd);
+	skel_closenz(skel->maps.hid_jmp_table.map_fd);
+	skel_closenz(skel->maps.progs_map.map_fd);
+	skel_free(skel);
+}
+static inline struct entrypoints_bpf *
+entrypoints_bpf__open(void)
+{
+	struct entrypoints_bpf *skel;
+
+	skel = skel_alloc(sizeof(*skel));
+	if (!skel)
+		goto cleanup;
+	skel->ctx.sz = (void *)&skel->links - (void *)skel;
+	return skel;
+cleanup:
+	entrypoints_bpf__destroy(skel);
+	return NULL;
+}
+
+static inline int
+entrypoints_bpf__load(struct entrypoints_bpf *skel)
+{
+	struct bpf_load_and_run_opts opts = {};
+	int err;
+
+	opts.ctx = (struct bpf_loader_ctx *)skel;
+	opts.data_sz = 10624;
+	opts.data = (void *)"\
+\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
+\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
+\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
+\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
+\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
+\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
+\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
+\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
+\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
+\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
+\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
+\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
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+	opts.insns_sz = 3152;
+	opts.insns = (void *)"\
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+\0\0\0\0\x63\x78\x04\0\0\0\0\0\xbf\x79\0\0\0\0\0\0\x77\x09\0\0\x20\0\0\0\x55\
+\x09\x02\0\0\0\0\0\x6a\x08\x02\0\0\0\0\0\x05\0\x04\0\0\0\0\0\x18\x60\0\0\0\0\0\
+\0\0\0\0\0\0\x01\0\0\x63\x90\0\0\0\0\0\0\x6a\x08\x02\0\x40\0\0\0\xb7\x01\0\0\
+\x05\0\0\0\x18\x62\0\0\0\0\0\0\0\0\0\0\xc0\x28\0\0\xb7\x03\0\0\x8c\0\0\0\x85\0\
+\0\0\xa6\0\0\0\xbf\x07\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\0\x01\0\0\x61\
+\x01\0\0\0\0\0\0\xd5\x01\x02\0\0\0\0\0\xbf\x19\0\0\0\0\0\0\x85\0\0\0\xa8\0\0\0\
+\x18\x60\0\0\0\0\0\0\0\0\0\0\x30\x29\0\0\x61\x01\0\0\0\0\0\0\xd5\x01\x02\0\0\0\
+\0\0\xbf\x19\0\0\0\0\0\0\x85\0\0\0\xa8\0\0\0\xc5\x07\x92\xfe\0\0\0\0\x63\x7a\
+\x88\xff\0\0\0\0\x61\xa1\x78\xff\0\0\0\0\xd5\x01\x02\0\0\0\0\0\xbf\x19\0\0\0\0\
+\0\0\x85\0\0\0\xa8\0\0\0\x61\xa0\x80\xff\0\0\0\0\x63\x06\x38\0\0\0\0\0\x61\xa0\
+\x84\xff\0\0\0\0\x63\x06\x3c\0\0\0\0\0\x61\xa0\x88\xff\0\0\0\0\x63\x06\x40\0\0\
+\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x61\x10\0\0\0\0\0\0\x63\x06\x18\0\0\
+\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x04\0\0\0\x61\x10\0\0\0\0\0\0\x63\x06\x28\0\
+\0\0\0\0\xb7\0\0\0\0\0\0\0\x95\0\0\0\0\0\0\0";
+	err = bpf_load_and_run(&opts);
+	if (err < 0)
+		return err;
+	return 0;
+}
+
+static inline struct entrypoints_bpf *
+entrypoints_bpf__open_and_load(void)
+{
+	struct entrypoints_bpf *skel;
+
+	skel = entrypoints_bpf__open();
+	if (!skel)
+		return NULL;
+	if (entrypoints_bpf__load(skel)) {
+		entrypoints_bpf__destroy(skel);
+		return NULL;
+	}
+	return skel;
+}
+
+__attribute__((unused)) static void
+entrypoints_bpf__assert(struct entrypoints_bpf *s __attribute__((unused)))
+{
+#ifdef __cplusplus
+#define _Static_assert static_assert
+#endif
+#ifdef __cplusplus
+#undef _Static_assert
+#endif
+}
+
+#endif /* __ENTRYPOINTS_BPF_SKEL_H__ */
diff --git a/drivers/hid/bpf/hid_bpf_dispatch.c b/drivers/hid/bpf/hid_bpf_dispatch.c
new file mode 100644
index 000000000000..600b00fdf6c1
--- /dev/null
+++ b/drivers/hid/bpf/hid_bpf_dispatch.c
@@ -0,0 +1,223 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+/*
+ *  HID-BPF support for Linux
+ *
+ *  Copyright (c) 2022 Benjamin Tissoires
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/bitops.h>
+#include <linux/btf.h>
+#include <linux/btf_ids.h>
+#include <linux/filter.h>
+#include <linux/hid.h>
+#include <linux/hid_bpf.h>
+#include <linux/init.h>
+#include <linux/kfifo.h>
+#include <linux/module.h>
+#include <linux/workqueue.h>
+#include "hid_bpf_dispatch.h"
+#include "entrypoints/entrypoints.lskel.h"
+
+struct hid_bpf_ops *hid_bpf_ops;
+EXPORT_SYMBOL(hid_bpf_ops);
+
+/**
+ * hid_bpf_device_event - Called whenever an event is coming in from the device
+ *
+ * @ctx: The HID-BPF context
+ *
+ * @return %0 on success and keep processing; a negative error code to interrupt
+ * the processing of this event
+ *
+ * Declare an %fmod_ret tracing bpf program to this function and attach this
+ * program through hid_bpf_attach_prog() to have this helper called for
+ * any incoming event from the device itself.
+ *
+ * The function is called while on IRQ context, so we can not sleep.
+ */
+/* never used by the kernel but declared so we can load and attach a tracepoint */
+__weak noinline int hid_bpf_device_event(struct hid_bpf_ctx *ctx)
+{
+	return 0;
+}
+ALLOW_ERROR_INJECTION(hid_bpf_device_event, ERRNO);
+
+int
+dispatch_hid_bpf_device_event(struct hid_device *hdev, enum hid_report_type type, u8 *data,
+			      u32 size, int interrupt)
+{
+	struct hid_bpf_ctx_kern ctx_kern = {
+		.ctx = {
+			.hid = hdev,
+			.report_type = type,
+			.size = size,
+		},
+		.data = data,
+	};
+
+	if (type >= HID_REPORT_TYPES)
+		return -EINVAL;
+
+	return hid_bpf_prog_run(hdev, HID_BPF_PROG_TYPE_DEVICE_EVENT, &ctx_kern);
+}
+EXPORT_SYMBOL_GPL(dispatch_hid_bpf_device_event);
+
+/**
+ * hid_bpf_get_data - Get the kernel memory pointer associated with the context @ctx
+ *
+ * @ctx: The HID-BPF context
+ * @offset: The offset within the memory
+ * @rdwr_buf_size: the const size of the buffer
+ *
+ * @returns %NULL on error, an %__u8 memory pointer on success
+ */
+noinline __u8 *
+hid_bpf_get_data(struct hid_bpf_ctx *ctx, unsigned int offset, const size_t rdwr_buf_size)
+{
+	struct hid_bpf_ctx_kern *ctx_kern;
+
+	if (!ctx)
+		return NULL;
+
+	ctx_kern = container_of(ctx, struct hid_bpf_ctx_kern, ctx);
+
+	if (rdwr_buf_size + offset > ctx->size)
+		return NULL;
+
+	return ctx_kern->data + offset;
+}
+
+/*
+ * The following set contains all functions we agree BPF programs
+ * can use.
+ */
+BTF_SET8_START(hid_bpf_kfunc_ids)
+BTF_ID_FLAGS(func, call_hid_bpf_prog_release)
+BTF_ID_FLAGS(func, hid_bpf_get_data, KF_RET_NULL)
+BTF_SET8_END(hid_bpf_kfunc_ids)
+
+static const struct btf_kfunc_id_set hid_bpf_kfunc_set = {
+	.owner = THIS_MODULE,
+	.set   = &hid_bpf_kfunc_ids,
+};
+
+static int device_match_id(struct device *dev, const void *id)
+{
+	struct hid_device *hdev = to_hid_device(dev);
+
+	return hdev->id == *(int *)id;
+}
+
+/**
+ * hid_bpf_attach_prog - Attach the given @prog_fd to the given HID device
+ *
+ * @hid_id: the system unique identifier of the HID device
+ * @prog_fd: an fd in the user process representing the program to attach
+ * @flags: any logical OR combination of &enum hid_bpf_attach_flags
+ *
+ * @returns %0 on success, an error code otherwise.
+ */
+/* called from syscall */
+noinline int
+hid_bpf_attach_prog(unsigned int hid_id, int prog_fd, __u32 flags)
+{
+	struct hid_device *hdev;
+	struct device *dev;
+	int prog_type = hid_bpf_get_prog_attach_type(prog_fd);
+
+	if (!hid_bpf_ops)
+		return -EINVAL;
+
+	if (prog_type < 0)
+		return prog_type;
+
+	if (prog_type >= HID_BPF_PROG_TYPE_MAX)
+		return -EINVAL;
+
+	if ((flags & ~HID_BPF_FLAG_MASK))
+		return -EINVAL;
+
+	dev = bus_find_device(hid_bpf_ops->bus_type, NULL, &hid_id, device_match_id);
+	if (!dev)
+		return -EINVAL;
+
+	hdev = to_hid_device(dev);
+
+	return __hid_bpf_attach_prog(hdev, prog_type, prog_fd, flags);
+}
+
+/* for syscall HID-BPF */
+BTF_SET8_START(hid_bpf_syscall_kfunc_ids)
+BTF_ID_FLAGS(func, hid_bpf_attach_prog)
+BTF_SET8_END(hid_bpf_syscall_kfunc_ids)
+
+static const struct btf_kfunc_id_set hid_bpf_syscall_kfunc_set = {
+	.owner = THIS_MODULE,
+	.set   = &hid_bpf_syscall_kfunc_ids,
+};
+
+void hid_bpf_destroy_device(struct hid_device *hdev)
+{
+	if (!hdev)
+		return;
+
+	/* mark the device as destroyed in bpf so we don't reattach it */
+	hdev->bpf.destroyed = true;
+
+	__hid_bpf_destroy_device(hdev);
+}
+EXPORT_SYMBOL_GPL(hid_bpf_destroy_device);
+
+void hid_bpf_device_init(struct hid_device *hdev)
+{
+	spin_lock_init(&hdev->bpf.progs_lock);
+}
+EXPORT_SYMBOL_GPL(hid_bpf_device_init);
+
+static int __init hid_bpf_init(void)
+{
+	int err;
+
+	/* Note: if we exit with an error any time here, we would entirely break HID, which
+	 * is probably not something we want. So we log an error and return success.
+	 *
+	 * This is not a big deal: the syscall allowing to attach a BPF program to a HID device
+	 * will not be available, so nobody will be able to use the functionality.
+	 */
+
+	err = register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING, &hid_bpf_kfunc_set);
+	if (err) {
+		pr_warn("error while setting HID BPF tracing kfuncs: %d", err);
+		return 0;
+	}
+
+	err = hid_bpf_preload_skel();
+	if (err) {
+		pr_warn("error while preloading HID BPF dispatcher: %d", err);
+		return 0;
+	}
+
+	/* register syscalls after we are sure we can load our preloaded bpf program */
+	err = register_btf_kfunc_id_set(BPF_PROG_TYPE_SYSCALL, &hid_bpf_syscall_kfunc_set);
+	if (err) {
+		pr_warn("error while setting HID BPF syscall kfuncs: %d", err);
+		return 0;
+	}
+
+	return 0;
+}
+
+static void __exit hid_bpf_exit(void)
+{
+	/* HID depends on us, so if we hit that code, we are guaranteed that hid
+	 * has been removed and thus we do not need to clear the HID devices
+	 */
+	hid_bpf_free_links_and_skel();
+}
+
+late_initcall(hid_bpf_init);
+module_exit(hid_bpf_exit);
+MODULE_AUTHOR("Benjamin Tissoires");
+MODULE_LICENSE("GPL");
diff --git a/drivers/hid/bpf/hid_bpf_dispatch.h b/drivers/hid/bpf/hid_bpf_dispatch.h
new file mode 100644
index 000000000000..98c378e18b2b
--- /dev/null
+++ b/drivers/hid/bpf/hid_bpf_dispatch.h
@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef _BPF_HID_BPF_DISPATCH_H
+#define _BPF_HID_BPF_DISPATCH_H
+
+#include <linux/hid.h>
+
+struct hid_bpf_ctx_kern {
+	struct hid_bpf_ctx ctx;
+	u8 *data;
+};
+
+int hid_bpf_preload_skel(void);
+void hid_bpf_free_links_and_skel(void);
+int hid_bpf_get_prog_attach_type(int prog_fd);
+int __hid_bpf_attach_prog(struct hid_device *hdev, enum hid_bpf_prog_type prog_type, int prog_fd,
+			  __u32 flags);
+void __hid_bpf_destroy_device(struct hid_device *hdev);
+int hid_bpf_prog_run(struct hid_device *hdev, enum hid_bpf_prog_type type,
+		     struct hid_bpf_ctx_kern *ctx_kern);
+
+struct bpf_prog;
+
+/* HID-BPF internal kfuncs API */
+bool call_hid_bpf_prog_release(u64 prog, int table_cnt);
+
+#endif
diff --git a/drivers/hid/bpf/hid_bpf_jmp_table.c b/drivers/hid/bpf/hid_bpf_jmp_table.c
new file mode 100644
index 000000000000..05225ff3cc27
--- /dev/null
+++ b/drivers/hid/bpf/hid_bpf_jmp_table.c
@@ -0,0 +1,568 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+/*
+ *  HID-BPF support for Linux
+ *
+ *  Copyright (c) 2022 Benjamin Tissoires
+ */
+
+#include <linux/bitops.h>
+#include <linux/btf.h>
+#include <linux/btf_ids.h>
+#include <linux/circ_buf.h>
+#include <linux/filter.h>
+#include <linux/hid.h>
+#include <linux/hid_bpf.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/workqueue.h>
+#include "hid_bpf_dispatch.h"
+#include "entrypoints/entrypoints.lskel.h"
+
+#define HID_BPF_MAX_PROGS 1024 /* keep this in sync with preloaded bpf,
+				* needs to be a power of 2 as we use it as
+				* a circular buffer
+				*/
+
+#define NEXT(idx) (((idx) + 1) & (HID_BPF_MAX_PROGS - 1))
+#define PREV(idx) (((idx) - 1) & (HID_BPF_MAX_PROGS - 1))
+
+/*
+ * represents one attached program stored in the hid jump table
+ */
+struct hid_bpf_prog_entry {
+	struct bpf_prog *prog;
+	struct hid_device *hdev;
+	enum hid_bpf_prog_type type;
+	u16 idx;
+};
+
+struct hid_bpf_jmp_table {
+	struct bpf_map *map;
+	struct bpf_map *prog_keys;
+	struct hid_bpf_prog_entry entries[HID_BPF_MAX_PROGS]; /* compacted list, circular buffer */
+	int tail, head;
+	struct bpf_prog *progs[HID_BPF_MAX_PROGS]; /* idx -> progs mapping */
+	unsigned long enabled[BITS_TO_LONGS(HID_BPF_MAX_PROGS)];
+};
+
+#define FOR_ENTRIES(__i, __start, __end) \
+	for (__i = __start; CIRC_CNT(__end, __i, HID_BPF_MAX_PROGS); __i = NEXT(__i))
+
+static struct hid_bpf_jmp_table jmp_table;
+
+static DEFINE_MUTEX(hid_bpf_attach_lock);		/* held when attaching/detaching programs */
+
+static void hid_bpf_release_progs(struct work_struct *work);
+
+static DECLARE_WORK(release_work, hid_bpf_release_progs);
+
+BTF_ID_LIST(hid_bpf_btf_ids)
+BTF_ID(func, hid_bpf_device_event)			/* HID_BPF_PROG_TYPE_DEVICE_EVENT */
+
+static int hid_bpf_max_programs(enum hid_bpf_prog_type type)
+{
+	switch (type) {
+	case HID_BPF_PROG_TYPE_DEVICE_EVENT:
+		return HID_BPF_MAX_PROGS_PER_DEV;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int hid_bpf_program_count(struct hid_device *hdev,
+				 struct bpf_prog *prog,
+				 enum hid_bpf_prog_type type)
+{
+	int i, n = 0;
+
+	if (type >= HID_BPF_PROG_TYPE_MAX)
+		return -EINVAL;
+
+	FOR_ENTRIES(i, jmp_table.tail, jmp_table.head) {
+		struct hid_bpf_prog_entry *entry = &jmp_table.entries[i];
+
+		if (type != HID_BPF_PROG_TYPE_UNDEF && entry->type != type)
+			continue;
+
+		if (hdev && entry->hdev != hdev)
+			continue;
+
+		if (prog && entry->prog != prog)
+			continue;
+
+		n++;
+	}
+
+	return n;
+}
+
+__weak noinline int __hid_bpf_tail_call(struct hid_bpf_ctx *ctx)
+{
+	return 0;
+}
+ALLOW_ERROR_INJECTION(__hid_bpf_tail_call, ERRNO);
+
+int hid_bpf_prog_run(struct hid_device *hdev, enum hid_bpf_prog_type type,
+		     struct hid_bpf_ctx_kern *ctx_kern)
+{
+	struct hid_bpf_prog_list *prog_list;
+	int i, idx, err = 0;
+
+	rcu_read_lock();
+	prog_list = rcu_dereference(hdev->bpf.progs[type]);
+
+	if (!prog_list)
+		goto out_unlock;
+
+	for (i = 0; i < prog_list->prog_cnt; i++) {
+		idx = prog_list->prog_idx[i];
+
+		if (!test_bit(idx, jmp_table.enabled))
+			continue;
+
+		ctx_kern->ctx.index = idx;
+		err = __hid_bpf_tail_call(&ctx_kern->ctx);
+		if (err)
+			break;
+	}
+
+ out_unlock:
+	rcu_read_unlock();
+
+	return err;
+}
+
+/*
+ * assign the list of programs attached to a given hid device.
+ */
+static void __hid_bpf_set_hdev_progs(struct hid_device *hdev, struct hid_bpf_prog_list *new_list,
+				     enum hid_bpf_prog_type type)
+{
+	struct hid_bpf_prog_list *old_list;
+
+	spin_lock(&hdev->bpf.progs_lock);
+	old_list = rcu_dereference_protected(hdev->bpf.progs[type],
+					     lockdep_is_held(&hdev->bpf.progs_lock));
+	rcu_assign_pointer(hdev->bpf.progs[type], new_list);
+	spin_unlock(&hdev->bpf.progs_lock);
+	synchronize_rcu();
+
+	kfree(old_list);
+}
+
+/*
+ * allocate and populate the list of programs attached to a given hid device.
+ *
+ * Must be called under lock.
+ */
+static int hid_bpf_populate_hdev(struct hid_device *hdev, enum hid_bpf_prog_type type)
+{
+	struct hid_bpf_prog_list *new_list;
+	int i;
+
+	if (type >= HID_BPF_PROG_TYPE_MAX || !hdev)
+		return -EINVAL;
+
+	if (hdev->bpf.destroyed)
+		return 0;
+
+	new_list = kzalloc(sizeof(*new_list), GFP_KERNEL);
+	if (!new_list)
+		return -ENOMEM;
+
+	FOR_ENTRIES(i, jmp_table.tail, jmp_table.head) {
+		struct hid_bpf_prog_entry *entry = &jmp_table.entries[i];
+
+		if (entry->type == type && entry->hdev == hdev &&
+		    test_bit(entry->idx, jmp_table.enabled))
+			new_list->prog_idx[new_list->prog_cnt++] = entry->idx;
+	}
+
+	__hid_bpf_set_hdev_progs(hdev, new_list, type);
+
+	return 0;
+}
+
+static void __hid_bpf_do_release_prog(int map_fd, unsigned int idx)
+{
+	skel_map_delete_elem(map_fd, &idx);
+	jmp_table.progs[idx] = NULL;
+}
+
+static void hid_bpf_release_progs(struct work_struct *work)
+{
+	int i, j, n, map_fd = -1;
+
+	if (!jmp_table.map)
+		return;
+
+	/* retrieve a fd of our prog_array map in BPF */
+	map_fd = skel_map_get_fd_by_id(jmp_table.map->id);
+	if (map_fd < 0)
+		return;
+
+	mutex_lock(&hid_bpf_attach_lock); /* protects against attaching new programs */
+
+	/* detach unused progs from HID devices */
+	FOR_ENTRIES(i, jmp_table.tail, jmp_table.head) {
+		struct hid_bpf_prog_entry *entry = &jmp_table.entries[i];
+		enum hid_bpf_prog_type type;
+		struct hid_device *hdev;
+
+		if (test_bit(entry->idx, jmp_table.enabled))
+			continue;
+
+		/* we have an attached prog */
+		if (entry->hdev) {
+			hdev = entry->hdev;
+			type = entry->type;
+
+			hid_bpf_populate_hdev(hdev, type);
+
+			/* mark all other disabled progs from hdev of the given type as detached */
+			FOR_ENTRIES(j, i, jmp_table.head) {
+				struct hid_bpf_prog_entry *next;
+
+				next = &jmp_table.entries[j];
+
+				if (test_bit(next->idx, jmp_table.enabled))
+					continue;
+
+				if (next->hdev == hdev && next->type == type)
+					next->hdev = NULL;
+			}
+		}
+	}
+
+	/* remove all unused progs from the jump table */
+	FOR_ENTRIES(i, jmp_table.tail, jmp_table.head) {
+		struct hid_bpf_prog_entry *entry = &jmp_table.entries[i];
+
+		if (test_bit(entry->idx, jmp_table.enabled))
+			continue;
+
+		if (entry->prog)
+			__hid_bpf_do_release_prog(map_fd, entry->idx);
+	}
+
+	/* compact the entry list */
+	n = jmp_table.tail;
+	FOR_ENTRIES(i, jmp_table.tail, jmp_table.head) {
+		struct hid_bpf_prog_entry *entry = &jmp_table.entries[i];
+
+		if (!test_bit(entry->idx, jmp_table.enabled))
+			continue;
+
+		jmp_table.entries[n] = jmp_table.entries[i];
+		n = NEXT(n);
+	}
+
+	jmp_table.head = n;
+
+	mutex_unlock(&hid_bpf_attach_lock);
+
+	if (map_fd >= 0)
+		close_fd(map_fd);
+}
+
+static void hid_bpf_release_prog_at(int idx)
+{
+	int map_fd = -1;
+
+	/* retrieve a fd of our prog_array map in BPF */
+	map_fd = skel_map_get_fd_by_id(jmp_table.map->id);
+	if (map_fd < 0)
+		return;
+
+	__hid_bpf_do_release_prog(map_fd, idx);
+
+	close(map_fd);
+}
+
+/*
+ * Insert the given BPF program represented by its fd in the jmp table.
+ * Returns the index in the jump table or a negative error.
+ */
+static int hid_bpf_insert_prog(int prog_fd, struct bpf_prog *prog)
+{
+	int i, cnt, index = -1, map_fd = -1, progs_map_fd = -1, err = -EINVAL;
+
+	/* retrieve a fd of our prog_array map in BPF */
+	map_fd = skel_map_get_fd_by_id(jmp_table.map->id);
+	/* take an fd for the table of progs we monitor with SEC("fexit/bpf_prog_release") */
+	progs_map_fd = skel_map_get_fd_by_id(jmp_table.prog_keys->id);
+
+	if (map_fd < 0 || progs_map_fd < 0) {
+		err = -EINVAL;
+		goto out;
+	}
+
+	cnt = 0;
+	/* find the first available index in the jmp_table
+	 * and count how many time this program has been inserted
+	 */
+	for (i = 0; i < HID_BPF_MAX_PROGS; i++) {
+		if (!jmp_table.progs[i] && index < 0) {
+			/* mark the index as used */
+			jmp_table.progs[i] = prog;
+			index = i;
+			__set_bit(i, jmp_table.enabled);
+			cnt++;
+		} else {
+			if (jmp_table.progs[i] == prog)
+				cnt++;
+		}
+	}
+	if (index < 0) {
+		err = -ENOMEM;
+		goto out;
+	}
+
+	/* insert the program in the jump table */
+	err = skel_map_update_elem(map_fd, &index, &prog_fd, 0);
+	if (err)
+		goto out;
+
+	/* insert the program in the prog list table */
+	err = skel_map_update_elem(progs_map_fd, &prog, &cnt, 0);
+	if (err)
+		goto out;
+
+	/* return the index */
+	err = index;
+
+ out:
+	if (err < 0)
+		__hid_bpf_do_release_prog(map_fd, index);
+	if (map_fd >= 0)
+		close_fd(map_fd);
+	if (progs_map_fd >= 0)
+		close_fd(progs_map_fd);
+	return err;
+}
+
+int hid_bpf_get_prog_attach_type(int prog_fd)
+{
+	struct bpf_prog *prog = NULL;
+	int i;
+	int prog_type = HID_BPF_PROG_TYPE_UNDEF;
+
+	prog = bpf_prog_get(prog_fd);
+	if (IS_ERR(prog))
+		return PTR_ERR(prog);
+
+	for (i = 0; i < HID_BPF_PROG_TYPE_MAX; i++) {
+		if (hid_bpf_btf_ids[i] == prog->aux->attach_btf_id) {
+			prog_type = i;
+			break;
+		}
+	}
+
+	bpf_prog_put(prog);
+
+	return prog_type;
+}
+
+/* called from syscall */
+noinline int
+__hid_bpf_attach_prog(struct hid_device *hdev, enum hid_bpf_prog_type prog_type,
+		      int prog_fd, __u32 flags)
+{
+	struct bpf_prog *prog = NULL;
+	struct hid_bpf_prog_entry *prog_entry;
+	int cnt, err = -EINVAL, prog_idx = -1;
+
+	/* take a ref on the prog itself */
+	prog = bpf_prog_get(prog_fd);
+	if (IS_ERR(prog))
+		return PTR_ERR(prog);
+
+	mutex_lock(&hid_bpf_attach_lock);
+
+	/* do not attach too many programs to a given HID device */
+	cnt = hid_bpf_program_count(hdev, NULL, prog_type);
+	if (cnt < 0) {
+		err = cnt;
+		goto out_unlock;
+	}
+
+	if (cnt >= hid_bpf_max_programs(prog_type)) {
+		err = -E2BIG;
+		goto out_unlock;
+	}
+
+	prog_idx = hid_bpf_insert_prog(prog_fd, prog);
+	/* if the jmp table is full, abort */
+	if (prog_idx < 0) {
+		err = prog_idx;
+		goto out_unlock;
+	}
+
+	if (flags & HID_BPF_FLAG_INSERT_HEAD) {
+		/* take the previous prog_entry slot */
+		jmp_table.tail = PREV(jmp_table.tail);
+		prog_entry = &jmp_table.entries[jmp_table.tail];
+	} else {
+		/* take the next prog_entry slot */
+		prog_entry = &jmp_table.entries[jmp_table.head];
+		jmp_table.head = NEXT(jmp_table.head);
+	}
+
+	/* we steal the ref here */
+	prog_entry->prog = prog;
+	prog_entry->idx = prog_idx;
+	prog_entry->hdev = hdev;
+	prog_entry->type = prog_type;
+
+	/* finally store the index in the device list */
+	err = hid_bpf_populate_hdev(hdev, prog_type);
+	if (err)
+		hid_bpf_release_prog_at(prog_idx);
+
+ out_unlock:
+	mutex_unlock(&hid_bpf_attach_lock);
+
+	/* we only use prog as a key in the various tables, so we don't need to actually
+	 * increment the ref count.
+	 */
+	bpf_prog_put(prog);
+
+	return err;
+}
+
+void __hid_bpf_destroy_device(struct hid_device *hdev)
+{
+	int type, i;
+	struct hid_bpf_prog_list *prog_list;
+
+	rcu_read_lock();
+
+	for (type = 0; type < HID_BPF_PROG_TYPE_MAX; type++) {
+		prog_list = rcu_dereference(hdev->bpf.progs[type]);
+
+		if (!prog_list)
+			continue;
+
+		for (i = 0; i < prog_list->prog_cnt; i++)
+			__clear_bit(prog_list->prog_idx[i], jmp_table.enabled);
+	}
+
+	rcu_read_unlock();
+
+	for (type = 0; type < HID_BPF_PROG_TYPE_MAX; type++)
+		__hid_bpf_set_hdev_progs(hdev, NULL, type);
+
+	/* schedule release of all detached progs */
+	schedule_work(&release_work);
+}
+
+noinline bool
+call_hid_bpf_prog_release(u64 prog_key, int table_cnt)
+{
+	/* compare with how many refs are left in the bpf program */
+	struct bpf_prog *prog = (struct bpf_prog *)prog_key;
+	int idx;
+
+	if (!prog)
+		return false;
+
+	if (atomic64_read(&prog->aux->refcnt) != table_cnt)
+		return false;
+
+	/* we don't need locking here because the entries in the progs table
+	 * are stable:
+	 * if there are other users (and the progs entries might change), we
+	 * would return in the statement above.
+	 */
+	for (idx = 0; idx < HID_BPF_MAX_PROGS; idx++) {
+		if (jmp_table.progs[idx] == prog) {
+			__clear_bit(idx, jmp_table.enabled);
+			break;
+		}
+	}
+	if (idx >= HID_BPF_MAX_PROGS) {
+		/* should never happen if we get our refcount right */
+		idx = -1;
+	}
+
+	/* schedule release of all detached progs */
+	schedule_work(&release_work);
+	return idx >= 0;
+}
+
+#define HID_BPF_PROGS_COUNT 3
+
+static struct bpf_link *links[HID_BPF_PROGS_COUNT];
+static struct entrypoints_bpf *skel;
+
+void hid_bpf_free_links_and_skel(void)
+{
+	int i;
+
+	/* the following is enough to release all programs attached to hid */
+	if (jmp_table.prog_keys)
+		bpf_map_put_with_uref(jmp_table.prog_keys);
+
+	if (jmp_table.map)
+		bpf_map_put_with_uref(jmp_table.map);
+
+	for (i = 0; i < ARRAY_SIZE(links); i++) {
+		if (!IS_ERR_OR_NULL(links[i]))
+			bpf_link_put(links[i]);
+	}
+	entrypoints_bpf__destroy(skel);
+}
+
+#define ATTACH_AND_STORE_LINK(__name) do {					\
+	err = entrypoints_bpf__##__name##__attach(skel);			\
+	if (err)								\
+		goto out;							\
+										\
+	links[idx] = bpf_link_get_from_fd(skel->links.__name##_fd);		\
+	if (IS_ERR(links[idx])) {						\
+		err = PTR_ERR(links[idx]);					\
+		goto out;							\
+	}									\
+										\
+	/* Avoid taking over stdin/stdout/stderr of init process. Zeroing out	\
+	 * makes skel_closenz() a no-op later in iterators_bpf__destroy().	\
+	 */									\
+	close_fd(skel->links.__name##_fd);					\
+	skel->links.__name##_fd = 0;						\
+	idx++;									\
+} while (0)
+
+int hid_bpf_preload_skel(void)
+{
+	int err, idx = 0;
+
+	skel = entrypoints_bpf__open();
+	if (!skel)
+		return -ENOMEM;
+
+	err = entrypoints_bpf__load(skel);
+	if (err)
+		goto out;
+
+	jmp_table.map = bpf_map_get_with_uref(skel->maps.hid_jmp_table.map_fd);
+	if (IS_ERR(jmp_table.map)) {
+		err = PTR_ERR(jmp_table.map);
+		goto out;
+	}
+
+	jmp_table.prog_keys = bpf_map_get_with_uref(skel->maps.progs_map.map_fd);
+	if (IS_ERR(jmp_table.prog_keys)) {
+		err = PTR_ERR(jmp_table.prog_keys);
+		goto out;
+	}
+
+	ATTACH_AND_STORE_LINK(hid_tail_call);
+	ATTACH_AND_STORE_LINK(hid_prog_release);
+	ATTACH_AND_STORE_LINK(hid_free_inode);
+
+	return 0;
+out:
+	hid_bpf_free_links_and_skel();
+	return err;
+}
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 9c1d31f63f85..1098c49b5d2e 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -2040,6 +2040,10 @@ int hid_input_report(struct hid_device *hid, enum hid_report_type type, u8 *data
 	report_enum = hid->report_enum + type;
 	hdrv = hid->driver;
 
+	ret = dispatch_hid_bpf_device_event(hid, type, data, size, interrupt);
+	if (ret)
+		goto unlock;
+
 	if (!size) {
 		dbg_hid("empty report\n");
 		ret = -1;
@@ -2790,6 +2794,8 @@ struct hid_device *hid_allocate_device(void)
 	sema_init(&hdev->driver_input_lock, 1);
 	mutex_init(&hdev->ll_open_lock);
 
+	hid_bpf_device_init(hdev);
+
 	return hdev;
 }
 EXPORT_SYMBOL_GPL(hid_allocate_device);
@@ -2816,6 +2822,7 @@ static void hid_remove_device(struct hid_device *hdev)
  */
 void hid_destroy_device(struct hid_device *hdev)
 {
+	hid_bpf_destroy_device(hdev);
 	hid_remove_device(hdev);
 	put_device(&hdev->dev);
 }
@@ -2902,6 +2909,13 @@ int hid_check_keys_pressed(struct hid_device *hid)
 }
 EXPORT_SYMBOL_GPL(hid_check_keys_pressed);
 
+#ifdef CONFIG_HID_BPF
+static struct hid_bpf_ops hid_ops = {
+	.owner = THIS_MODULE,
+	.bus_type = &hid_bus_type,
+};
+#endif
+
 static int __init hid_init(void)
 {
 	int ret;
@@ -2916,6 +2930,10 @@ static int __init hid_init(void)
 		goto err;
 	}
 
+#ifdef CONFIG_HID_BPF
+	hid_bpf_ops = &hid_ops;
+#endif
+
 	ret = hidraw_init();
 	if (ret)
 		goto err_bus;
@@ -2931,6 +2949,9 @@ err:
 
 static void __exit hid_exit(void)
 {
+#ifdef CONFIG_HID_BPF
+	hid_bpf_ops = NULL;
+#endif
 	hid_debug_exit();
 	hidraw_exit();
 	bus_unregister(&hid_bus_type);
-- 
cgit v1.2.3


From 0baef37335dd4d5cffd00c9b8bbf2e0b71e4239f Mon Sep 17 00:00:00 2001
From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Date: Thu, 3 Nov 2022 16:57:46 +0100
Subject: HID: bpf jmp table: simplify the logic of cleaning up programs

Kind of a hack, but works for now:

Instead of listening for any close of eBPF program, we now
decrement the refcount when we insert it in our internal
map of fd progs.

This is safe to do because:
- we listen to any call of destructor of programs
- when a program is being destroyed, we disable it by removing
  it from any RCU list used by any HID device (so it will never
  be called)
- we then trigger a job to cleanup the prog fd map, but we overwrite
  the removal of the elements to not do anything on the programs, just
  remove the allocated space

This is better than previously because we can remove the map of known
programs and their usage count. We now rely on the refcount of
bpf, which has greater chances of being accurate.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
 drivers/hid/bpf/entrypoints/entrypoints.bpf.c   |  40 +-
 drivers/hid/bpf/entrypoints/entrypoints.lskel.h | 648 ++++++------------------
 drivers/hid/bpf/hid_bpf_dispatch.c              |   2 +-
 drivers/hid/bpf/hid_bpf_dispatch.h              |   2 +-
 drivers/hid/bpf/hid_bpf_jmp_table.c             |  92 ++--
 5 files changed, 211 insertions(+), 573 deletions(-)

(limited to 'drivers')

diff --git a/drivers/hid/bpf/entrypoints/entrypoints.bpf.c b/drivers/hid/bpf/entrypoints/entrypoints.bpf.c
index 41dd66d5fc7a..7c1895d9e5c0 100644
--- a/drivers/hid/bpf/entrypoints/entrypoints.bpf.c
+++ b/drivers/hid/bpf/entrypoints/entrypoints.bpf.c
@@ -7,7 +7,7 @@
 
 #define HID_BPF_MAX_PROGS 1024
 
-extern bool call_hid_bpf_prog_release(u64 prog, int table_cnt) __ksym;
+extern void call_hid_bpf_prog_put_deferred(struct work_struct *work) __ksym;
 
 struct {
 	__uint(type, BPF_MAP_TYPE_PROG_ARRAY);
@@ -16,13 +16,6 @@ struct {
 	__uint(value_size, sizeof(__u32));
 } hid_jmp_table SEC(".maps");
 
-struct {
-	__uint(type, BPF_MAP_TYPE_HASH);
-	__uint(max_entries, HID_BPF_MAX_PROGS * HID_BPF_PROG_TYPE_MAX);
-	__type(key, void *);
-	__type(value, __u8);
-} progs_map SEC(".maps");
-
 SEC("fmod_ret/__hid_bpf_tail_call")
 int BPF_PROG(hid_tail_call, struct hid_bpf_ctx *hctx)
 {
@@ -31,35 +24,10 @@ int BPF_PROG(hid_tail_call, struct hid_bpf_ctx *hctx)
 	return 0;
 }
 
-static void release_prog(u64 prog)
-{
-	u8 *value;
-
-	value = bpf_map_lookup_elem(&progs_map, &prog);
-	if (!value)
-		return;
-
-	if (call_hid_bpf_prog_release(prog, *value))
-		bpf_map_delete_elem(&progs_map, &prog);
-}
-
-SEC("fexit/bpf_prog_release")
-int BPF_PROG(hid_prog_release, struct inode *inode, struct file *filp)
+SEC("fentry/bpf_prog_put_deferred")
+int BPF_PROG(hid_bpf_prog_put_deferred, struct work_struct *work)
 {
-	u64 prog = (u64)filp->private_data;
-
-	release_prog(prog);
-
-	return 0;
-}
-
-SEC("fexit/bpf_free_inode")
-int BPF_PROG(hid_free_inode, struct inode *inode)
-{
-	u64 prog = (u64)inode->i_private;
-
-	release_prog(prog);
-
+	call_hid_bpf_prog_put_deferred(work);
 	return 0;
 }
 
diff --git a/drivers/hid/bpf/entrypoints/entrypoints.lskel.h b/drivers/hid/bpf/entrypoints/entrypoints.lskel.h
index aa7b7ab31abb..9ffb991b3e6f 100644
--- a/drivers/hid/bpf/entrypoints/entrypoints.lskel.h
+++ b/drivers/hid/bpf/entrypoints/entrypoints.lskel.h
@@ -9,17 +9,14 @@ struct entrypoints_bpf {
 	struct bpf_loader_ctx ctx;
 	struct {
 		struct bpf_map_desc hid_jmp_table;
-		struct bpf_map_desc progs_map;
 	} maps;
 	struct {
 		struct bpf_prog_desc hid_tail_call;
-		struct bpf_prog_desc hid_prog_release;
-		struct bpf_prog_desc hid_free_inode;
+		struct bpf_prog_desc hid_bpf_prog_put_deferred;
 	} progs;
 	struct {
 		int hid_tail_call_fd;
-		int hid_prog_release_fd;
-		int hid_free_inode_fd;
+		int hid_bpf_prog_put_deferred_fd;
 	} links;
 };
 
@@ -35,24 +32,13 @@ entrypoints_bpf__hid_tail_call__attach(struct entrypoints_bpf *skel)
 }
 
 static inline int
-entrypoints_bpf__hid_prog_release__attach(struct entrypoints_bpf *skel)
+entrypoints_bpf__hid_bpf_prog_put_deferred__attach(struct entrypoints_bpf *skel)
 {
-	int prog_fd = skel->progs.hid_prog_release.prog_fd;
+	int prog_fd = skel->progs.hid_bpf_prog_put_deferred.prog_fd;
 	int fd = skel_raw_tracepoint_open(NULL, prog_fd);
 
 	if (fd > 0)
-		skel->links.hid_prog_release_fd = fd;
-	return fd;
-}
-
-static inline int
-entrypoints_bpf__hid_free_inode__attach(struct entrypoints_bpf *skel)
-{
-	int prog_fd = skel->progs.hid_free_inode.prog_fd;
-	int fd = skel_raw_tracepoint_open(NULL, prog_fd);
-
-	if (fd > 0)
-		skel->links.hid_free_inode_fd = fd;
+		skel->links.hid_bpf_prog_put_deferred_fd = fd;
 	return fd;
 }
 
@@ -62,8 +48,7 @@ entrypoints_bpf__attach(struct entrypoints_bpf *skel)
 	int ret = 0;
 
 	ret = ret < 0 ? ret : entrypoints_bpf__hid_tail_call__attach(skel);
-	ret = ret < 0 ? ret : entrypoints_bpf__hid_prog_release__attach(skel);
-	ret = ret < 0 ? ret : entrypoints_bpf__hid_free_inode__attach(skel);
+	ret = ret < 0 ? ret : entrypoints_bpf__hid_bpf_prog_put_deferred__attach(skel);
 	return ret < 0 ? ret : 0;
 }
 
@@ -71,8 +56,7 @@ static inline void
 entrypoints_bpf__detach(struct entrypoints_bpf *skel)
 {
 	skel_closenz(skel->links.hid_tail_call_fd);
-	skel_closenz(skel->links.hid_prog_release_fd);
-	skel_closenz(skel->links.hid_free_inode_fd);
+	skel_closenz(skel->links.hid_bpf_prog_put_deferred_fd);
 }
 static void
 entrypoints_bpf__destroy(struct entrypoints_bpf *skel)
@@ -81,10 +65,8 @@ entrypoints_bpf__destroy(struct entrypoints_bpf *skel)
 		return;
 	entrypoints_bpf__detach(skel);
 	skel_closenz(skel->progs.hid_tail_call.prog_fd);
-	skel_closenz(skel->progs.hid_prog_release.prog_fd);
-	skel_closenz(skel->progs.hid_free_inode.prog_fd);
+	skel_closenz(skel->progs.hid_bpf_prog_put_deferred.prog_fd);
 	skel_closenz(skel->maps.hid_jmp_table.map_fd);
-	skel_closenz(skel->maps.progs_map.map_fd);
 	skel_free(skel);
 }
 static inline struct entrypoints_bpf *
@@ -109,7 +91,7 @@ entrypoints_bpf__load(struct entrypoints_bpf *skel)
 	int err;
 
 	opts.ctx = (struct bpf_loader_ctx *)skel;
-	opts.data_sz = 10624;
+	opts.data_sz = 3792;
 	opts.data = (void *)"\
 \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
 \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
@@ -144,475 +126,175 @@ entrypoints_bpf__load(struct entrypoints_bpf *skel)
 \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
 \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
 \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x9f\xeb\x01\0\
-\x18\0\0\0\0\0\0\0\xf0\x11\0\0\xf0\x11\0\0\x0e\x0c\0\0\0\0\0\0\0\0\0\x02\x03\0\
+\x18\0\0\0\0\0\0\0\xa4\x03\0\0\xa4\x03\0\0\x54\x03\0\0\0\0\0\0\0\0\0\x02\x03\0\
 \0\0\x01\0\0\0\0\0\0\x01\x04\0\0\0\x20\0\0\x01\0\0\0\0\0\0\0\x03\0\0\0\0\x02\0\
 \0\0\x04\0\0\0\x03\0\0\0\x05\0\0\0\0\0\0\x01\x04\0\0\0\x20\0\0\0\0\0\0\0\0\0\0\
 \x02\x06\0\0\0\0\0\0\0\0\0\0\x03\0\0\0\0\x02\0\0\0\x04\0\0\0\0\x04\0\0\0\0\0\0\
 \0\0\0\x02\x08\0\0\0\0\0\0\0\0\0\0\x03\0\0\0\0\x02\0\0\0\x04\0\0\0\x04\0\0\0\0\
 \0\0\0\x04\0\0\x04\x20\0\0\0\x19\0\0\0\x01\0\0\0\0\0\0\0\x1e\0\0\0\x05\0\0\0\
 \x40\0\0\0\x2a\0\0\0\x07\0\0\0\x80\0\0\0\x33\0\0\0\x07\0\0\0\xc0\0\0\0\x3e\0\0\
-\0\0\0\0\x0e\x09\0\0\0\x01\0\0\0\0\0\0\0\0\0\0\x02\x0c\0\0\0\0\0\0\0\0\0\0\x03\
-\0\0\0\0\x02\0\0\0\x04\0\0\0\x01\0\0\0\0\0\0\0\0\0\0\x02\x0e\0\0\0\0\0\0\0\0\0\
-\0\x03\0\0\0\0\x02\0\0\0\x04\0\0\0\0\x08\0\0\0\0\0\0\0\0\0\x02\x10\0\0\0\0\0\0\
-\0\0\0\0\x02\0\0\0\0\0\0\0\0\0\0\0\x02\x12\0\0\0\x4c\0\0\0\0\0\0\x08\x13\0\0\0\
-\x51\0\0\0\0\0\0\x01\x01\0\0\0\x08\0\0\0\0\0\0\0\x04\0\0\x04\x20\0\0\0\x19\0\0\
-\0\x0b\0\0\0\0\0\0\0\x1e\0\0\0\x0d\0\0\0\x40\0\0\0\x5f\0\0\0\x0f\0\0\0\x80\0\0\
-\0\x63\0\0\0\x11\0\0\0\xc0\0\0\0\x69\0\0\0\0\0\0\x0e\x14\0\0\0\x01\0\0\0\0\0\0\
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-\0\0\0\x46\x01\0\0\x1b\0\0\0\x80\0\0\0\x55\x01\0\0\x1f\0\0\0\xa0\0\0\0\0\0\0\0\
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-\0\0\x21\0\0\0\0\0\0\0\xd2\x01\0\0\x21\0\0\0\0\0\0\0\xd7\x01\0\0\0\0\0\x08\x02\
-\0\0\0\0\0\0\0\x01\0\0\x0d\x02\0\0\0\x86\0\0\0\x16\0\0\0\x13\x02\0\0\x01\0\0\
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-\x02\0\0\x2c\0\0\0\x80\0\0\0\x8e\x02\0\0\x2f\0\0\0\0\x01\0\0\x96\x02\0\0\x30\0\
-\0\0\x40\x01\0\0\x9b\x02\0\0\x32\0\0\0\x80\x01\0\0\xa2\x02\0\0\x41\0\0\0\xc0\
-\x01\0\0\xaa\x02\0\0\x1c\0\0\0\0\x02\0\0\xb2\x02\0\0\x47\0\0\0\x20\x02\0\0\xb9\
-\x02\0\0\x48\0\0\0\x40\x02\0\0\xc4\x02\0\0\x4d\0\0\0\x40\x03\0\0\xca\x02\0\0\
-\x4f\0\0\0\x80\x03\0\0\xd2\x02\0\0\x5d\0\0\0\x80\x04\0\0\xd9\x02\0\0\x5f\0\0\0\
-\xc0\x04\0\0\xde\x02\0\0\x61\0\0\0\xc0\x05\0\0\xe8\x02\0\0\x10\0\0\0\0\x06\0\0\
-\xf3\x02\0\0\x10\0\0\0\x40\x06\0\0\0\x03\0\0\x63\0\0\0\x80\x06\0\0\x05\x03\0\0\
-\x64\0\0\0\xc0\x06\0\0\x0f\x03\0\0\x65\0\0\0\0\x07\0\0\x18\x03\0\0\x65\0\0\0\
-\x20\x07\0\0\0\0\0\0\x03\0\0\x05\x10\0\0\0\x21\x03\0\0\x26\0\0\0\0\0\0\0\x29\
-\x03\0\0\x28\0\0\0\0\0\0\0\x33\x03\0\0\x1c\0\0\0\0\0\0\0\x40\x03\0\0\x01\0\0\
-\x04\x08\0\0\0\x4b\x03\0\0\x27\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x02\x26\0\0\0\x50\
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-\0\0\x40\0\0\0\0\0\0\0\0\0\0\x02\x28\0\0\0\0\0\0\0\0\0\0\x02\x2b\0\0\0\0\0\0\0\
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-\xb0\0\0\0\0\0\0\0\0\0\0\x02\xa3\0\0\0\0\0\0\0\0\0\0\x02\x6d\0\0\0\0\0\0\0\0\0\
-\0\x02\x31\0\0\0\0\0\0\0\0\0\0\x0a\xa5\0\0\0\x73\x03\0\0\0\0\0\x08\x33\0\0\0\
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-\0\0\x04\x04\0\0\0\0\0\0\0\x38\0\0\0\0\0\0\0\0\0\0\0\x03\0\0\x05\x04\0\0\0\xbd\
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-\x62\x07\0\0\x10\0\0\0\xc0\x01\0\0\x6d\x07\0\0\x60\0\0\0\0\x02\0\0\0\0\0\0\x77\
-\0\0\0\x40\x02\0\0\x73\x07\0\0\x79\0\0\0\x60\x02\0\0\x7a\x07\0\0\x4d\0\0\0\x80\
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-\x91\x07\0\0\x7b\0\0\0\xc0\x03\0\0\x99\x07\0\0\x32\0\0\0\x40\x04\0\0\xa0\x07\0\
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+	opts.insns_sz = 2056;
 	opts.insns = (void *)"\
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+\0\0\xc5\x07\x36\xff\0\0\0\0\x75\x07\x03\0\0\0\0\0\x62\x08\x04\0\0\0\0\0\x6a\
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+\0\x77\x09\0\0\x20\0\0\0\x55\x09\x02\0\0\0\0\0\x6a\x08\x02\0\0\0\0\0\x05\0\x04\
+\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\0\x01\0\0\x63\x90\0\0\0\0\0\0\x6a\x08\
+\x02\0\x40\0\0\0\xb7\x01\0\0\x05\0\0\0\x18\x62\0\0\0\0\0\0\0\0\0\0\x08\x0e\0\0\
+\xb7\x03\0\0\x8c\0\0\0\x85\0\0\0\xa6\0\0\0\xbf\x07\0\0\0\0\0\0\x18\x60\0\0\0\0\
+\0\0\0\0\0\0\0\x01\0\0\x61\x01\0\0\0\0\0\0\xd5\x01\x02\0\0\0\0\0\xbf\x19\0\0\0\
+\0\0\0\x85\0\0\0\xa8\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\x78\x0e\0\0\x61\x01\0\0\
 \0\0\0\0\xd5\x01\x02\0\0\0\0\0\xbf\x19\0\0\0\0\0\0\x85\0\0\0\xa8\0\0\0\xc5\x07\
-\x60\xff\0\0\0\0\x63\x7a\x80\xff\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\xf8\x24\0\
-\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x88\x26\0\0\x7b\x01\0\0\0\0\0\0\x18\x60\0\0\0\0\
-\0\0\0\0\0\0\0\x25\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x80\x26\0\0\x7b\x01\0\0\0\0\
-\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\xa0\x25\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\xc8\
-\x26\0\0\x7b\x01\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\xa8\x25\0\0\x18\x61\0\
-\0\0\0\0\0\0\0\0\0\xd8\x26\0\0\x7b\x01\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\
-\x68\x26\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\xf8\x26\0\0\x7b\x01\0\0\0\0\0\0\x18\
-\x60\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\xf0\x26\0\0\x7b\
-\x01\0\0\0\0\0\0\x61\x60\x08\0\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x90\x26\0\0\
-\x63\x01\0\0\0\0\0\0\x61\x60\x0c\0\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x94\x26\
-\0\0\x63\x01\0\0\0\0\0\0\x79\x60\x10\0\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x98\
-\x26\0\0\x7b\x01\0\0\0\0\0\0\x61\xa0\x78\xff\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\
-\0\xc0\x26\0\0\x63\x01\0\0\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x08\x27\0\0\xb7\
-\x02\0\0\x11\0\0\0\xb7\x03\0\0\x0c\0\0\0\xb7\x04\0\0\0\0\0\0\x85\0\0\0\xa7\0\0\
-\0\xbf\x07\0\0\0\0\0\0\xc5\x07\x29\xff\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\x78\
-\x26\0\0\x63\x70\x6c\0\0\0\0\0\x77\x07\0\0\x20\0\0\0\x63\x70\x70\0\0\0\0\0\x18\
-\x68\0\0\0\0\0\0\0\0\0\0\x58\x25\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x20\x27\0\0\
-\xb7\x02\0\0\x1a\0\0\0\xb7\x03\0\0\x0c\0\0\0\xb7\x04\0\0\0\0\0\0\x85\0\0\0\xa7\
-\0\0\0\xbf\x07\0\0\0\0\0\0\xc5\x07\x1a\xff\0\0\0\0\x75\x07\x03\0\0\0\0\0\x62\
-\x08\x04\0\0\0\0\0\x6a\x08\x02\0\0\0\0\0\x05\0\x0a\0\0\0\0\0\x63\x78\x04\0\0\0\
-\0\0\xbf\x79\0\0\0\0\0\0\x77\x09\0\0\x20\0\0\0\x55\x09\x02\0\0\0\0\0\x6a\x08\
-\x02\0\0\0\0\0\x05\0\x04\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\0\x01\0\0\x63\
-\x90\0\0\0\0\0\0\x6a\x08\x02\0\x40\0\0\0\xb7\x01\0\0\x05\0\0\0\x18\x62\0\0\0\0\
-\0\0\0\0\0\0\x78\x26\0\0\xb7\x03\0\0\x8c\0\0\0\x85\0\0\0\xa6\0\0\0\xbf\x07\0\0\
-\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\0\x01\0\0\x61\x01\0\0\0\0\0\0\xd5\x01\x02\
-\0\0\0\0\0\xbf\x19\0\0\0\0\0\0\x85\0\0\0\xa8\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\
-\xe8\x26\0\0\x61\x01\0\0\0\0\0\0\xd5\x01\x02\0\0\0\0\0\xbf\x19\0\0\0\0\0\0\x85\
-\0\0\0\xa8\0\0\0\xc5\x07\xf9\xfe\0\0\0\0\x63\x7a\x84\xff\0\0\0\0\x18\x60\0\0\0\
-\0\0\0\0\0\0\0\x40\x27\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\xd0\x28\0\0\x7b\x01\0\0\
-\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\x48\x27\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\
-\xc8\x28\0\0\x7b\x01\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\xe8\x27\0\0\x18\
-\x61\0\0\0\0\0\0\0\0\0\0\x10\x29\0\0\x7b\x01\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\
-\0\0\0\xf0\x27\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x20\x29\0\0\x7b\x01\0\0\0\0\0\0\
-\x18\x60\0\0\0\0\0\0\0\0\0\0\xb0\x28\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x40\x29\0\
-\0\x7b\x01\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x18\x61\0\0\0\0\0\0\
-\0\0\0\0\x38\x29\0\0\x7b\x01\0\0\0\0\0\0\x61\x60\x08\0\0\0\0\0\x18\x61\0\0\0\0\
-\0\0\0\0\0\0\xd8\x28\0\0\x63\x01\0\0\0\0\0\0\x61\x60\x0c\0\0\0\0\0\x18\x61\0\0\
-\0\0\0\0\0\0\0\0\xdc\x28\0\0\x63\x01\0\0\0\0\0\0\x79\x60\x10\0\0\0\0\0\x18\x61\
-\0\0\0\0\0\0\0\0\0\0\xe0\x28\0\0\x7b\x01\0\0\0\0\0\0\x61\xa0\x78\xff\0\0\0\0\
-\x18\x61\0\0\0\0\0\0\0\0\0\0\x08\x29\0\0\x63\x01\0\0\0\0\0\0\x18\x61\0\0\0\0\0\
-\0\0\0\0\0\x50\x29\0\0\xb7\x02\0\0\x0f\0\0\0\xb7\x03\0\0\x0c\0\0\0\xb7\x04\0\0\
-\0\0\0\0\x85\0\0\0\xa7\0\0\0\xbf\x07\0\0\0\0\0\0\xc5\x07\xc2\xfe\0\0\0\0\x18\
-\x60\0\0\0\0\0\0\0\0\0\0\xc0\x28\0\0\x63\x70\x6c\0\0\0\0\0\x77\x07\0\0\x20\0\0\
-\0\x63\x70\x70\0\0\0\0\0\x18\x68\0\0\0\0\0\0\0\0\0\0\xa0\x27\0\0\x18\x61\0\0\0\
-\0\0\0\0\0\0\0\x60\x29\0\0\xb7\x02\0\0\x1a\0\0\0\xb7\x03\0\0\x0c\0\0\0\xb7\x04\
-\0\0\0\0\0\0\x85\0\0\0\xa7\0\0\0\xbf\x07\0\0\0\0\0\0\xc5\x07\xb3\xfe\0\0\0\0\
-\x75\x07\x03\0\0\0\0\0\x62\x08\x04\0\0\0\0\0\x6a\x08\x02\0\0\0\0\0\x05\0\x0a\0\
-\0\0\0\0\x63\x78\x04\0\0\0\0\0\xbf\x79\0\0\0\0\0\0\x77\x09\0\0\x20\0\0\0\x55\
-\x09\x02\0\0\0\0\0\x6a\x08\x02\0\0\0\0\0\x05\0\x04\0\0\0\0\0\x18\x60\0\0\0\0\0\
-\0\0\0\0\0\0\x01\0\0\x63\x90\0\0\0\0\0\0\x6a\x08\x02\0\x40\0\0\0\xb7\x01\0\0\
-\x05\0\0\0\x18\x62\0\0\0\0\0\0\0\0\0\0\xc0\x28\0\0\xb7\x03\0\0\x8c\0\0\0\x85\0\
-\0\0\xa6\0\0\0\xbf\x07\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\0\x01\0\0\x61\
-\x01\0\0\0\0\0\0\xd5\x01\x02\0\0\0\0\0\xbf\x19\0\0\0\0\0\0\x85\0\0\0\xa8\0\0\0\
-\x18\x60\0\0\0\0\0\0\0\0\0\0\x30\x29\0\0\x61\x01\0\0\0\0\0\0\xd5\x01\x02\0\0\0\
-\0\0\xbf\x19\0\0\0\0\0\0\x85\0\0\0\xa8\0\0\0\xc5\x07\x92\xfe\0\0\0\0\x63\x7a\
-\x88\xff\0\0\0\0\x61\xa1\x78\xff\0\0\0\0\xd5\x01\x02\0\0\0\0\0\xbf\x19\0\0\0\0\
-\0\0\x85\0\0\0\xa8\0\0\0\x61\xa0\x80\xff\0\0\0\0\x63\x06\x38\0\0\0\0\0\x61\xa0\
-\x84\xff\0\0\0\0\x63\x06\x3c\0\0\0\0\0\x61\xa0\x88\xff\0\0\0\0\x63\x06\x40\0\0\
-\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x61\x10\0\0\0\0\0\0\x63\x06\x18\0\0\
-\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x04\0\0\0\x61\x10\0\0\0\0\0\0\x63\x06\x28\0\
-\0\0\0\0\xb7\0\0\0\0\0\0\0\x95\0\0\0\0\0\0\0";
+\x15\xff\0\0\0\0\x63\x7a\x84\xff\0\0\0\0\x61\xa1\x78\xff\0\0\0\0\xd5\x01\x02\0\
+\0\0\0\0\xbf\x19\0\0\0\0\0\0\x85\0\0\0\xa8\0\0\0\x61\xa0\x80\xff\0\0\0\0\x63\
+\x06\x28\0\0\0\0\0\x61\xa0\x84\xff\0\0\0\0\x63\x06\x2c\0\0\0\0\0\x18\x61\0\0\0\
+\0\0\0\0\0\0\0\0\0\0\0\x61\x10\0\0\0\0\0\0\x63\x06\x18\0\0\0\0\0\xb7\0\0\0\0\0\
+\0\0\x95\0\0\0\0\0\0\0";
 	err = bpf_load_and_run(&opts);
 	if (err < 0)
 		return err;
diff --git a/drivers/hid/bpf/hid_bpf_dispatch.c b/drivers/hid/bpf/hid_bpf_dispatch.c
index 600b00fdf6c1..0ef99caf937a 100644
--- a/drivers/hid/bpf/hid_bpf_dispatch.c
+++ b/drivers/hid/bpf/hid_bpf_dispatch.c
@@ -94,7 +94,7 @@ hid_bpf_get_data(struct hid_bpf_ctx *ctx, unsigned int offset, const size_t rdwr
  * can use.
  */
 BTF_SET8_START(hid_bpf_kfunc_ids)
-BTF_ID_FLAGS(func, call_hid_bpf_prog_release)
+BTF_ID_FLAGS(func, call_hid_bpf_prog_put_deferred)
 BTF_ID_FLAGS(func, hid_bpf_get_data, KF_RET_NULL)
 BTF_SET8_END(hid_bpf_kfunc_ids)
 
diff --git a/drivers/hid/bpf/hid_bpf_dispatch.h b/drivers/hid/bpf/hid_bpf_dispatch.h
index 98c378e18b2b..e2d64faa3932 100644
--- a/drivers/hid/bpf/hid_bpf_dispatch.h
+++ b/drivers/hid/bpf/hid_bpf_dispatch.h
@@ -22,6 +22,6 @@ int hid_bpf_prog_run(struct hid_device *hdev, enum hid_bpf_prog_type type,
 struct bpf_prog;
 
 /* HID-BPF internal kfuncs API */
-bool call_hid_bpf_prog_release(u64 prog, int table_cnt);
+void call_hid_bpf_prog_put_deferred(struct work_struct *work);
 
 #endif
diff --git a/drivers/hid/bpf/hid_bpf_jmp_table.c b/drivers/hid/bpf/hid_bpf_jmp_table.c
index 05225ff3cc27..e5f171ab480c 100644
--- a/drivers/hid/bpf/hid_bpf_jmp_table.c
+++ b/drivers/hid/bpf/hid_bpf_jmp_table.c
@@ -39,7 +39,6 @@ struct hid_bpf_prog_entry {
 
 struct hid_bpf_jmp_table {
 	struct bpf_map *map;
-	struct bpf_map *prog_keys;
 	struct hid_bpf_prog_entry entries[HID_BPF_MAX_PROGS]; /* compacted list, circular buffer */
 	int tail, head;
 	struct bpf_prog *progs[HID_BPF_MAX_PROGS]; /* idx -> progs mapping */
@@ -286,32 +285,23 @@ static void hid_bpf_release_prog_at(int idx)
  */
 static int hid_bpf_insert_prog(int prog_fd, struct bpf_prog *prog)
 {
-	int i, cnt, index = -1, map_fd = -1, progs_map_fd = -1, err = -EINVAL;
+	int i, index = -1, map_fd = -1, err = -EINVAL;
 
 	/* retrieve a fd of our prog_array map in BPF */
 	map_fd = skel_map_get_fd_by_id(jmp_table.map->id);
-	/* take an fd for the table of progs we monitor with SEC("fexit/bpf_prog_release") */
-	progs_map_fd = skel_map_get_fd_by_id(jmp_table.prog_keys->id);
 
-	if (map_fd < 0 || progs_map_fd < 0) {
+	if (map_fd < 0) {
 		err = -EINVAL;
 		goto out;
 	}
 
-	cnt = 0;
-	/* find the first available index in the jmp_table
-	 * and count how many time this program has been inserted
-	 */
+	/* find the first available index in the jmp_table */
 	for (i = 0; i < HID_BPF_MAX_PROGS; i++) {
 		if (!jmp_table.progs[i] && index < 0) {
 			/* mark the index as used */
 			jmp_table.progs[i] = prog;
 			index = i;
 			__set_bit(i, jmp_table.enabled);
-			cnt++;
-		} else {
-			if (jmp_table.progs[i] == prog)
-				cnt++;
 		}
 	}
 	if (index < 0) {
@@ -324,10 +314,15 @@ static int hid_bpf_insert_prog(int prog_fd, struct bpf_prog *prog)
 	if (err)
 		goto out;
 
-	/* insert the program in the prog list table */
-	err = skel_map_update_elem(progs_map_fd, &prog, &cnt, 0);
-	if (err)
-		goto out;
+	/*
+	 * The program has been safely inserted, decrement the reference count
+	 * so it doesn't interfere with the number of actual user handles.
+	 * This is safe to do because:
+	 * - we overrite the put_ptr in the prog fd map
+	 * - we also have a cleanup function that monitors when a program gets
+	 *   released and we manually do the cleanup in the prog fd map
+	 */
+	bpf_prog_sub(prog, 1);
 
 	/* return the index */
 	err = index;
@@ -337,8 +332,6 @@ static int hid_bpf_insert_prog(int prog_fd, struct bpf_prog *prog)
 		__hid_bpf_do_release_prog(map_fd, index);
 	if (map_fd >= 0)
 		close_fd(map_fd);
-	if (progs_map_fd >= 0)
-		close_fd(progs_map_fd);
 	return err;
 }
 
@@ -457,41 +450,38 @@ void __hid_bpf_destroy_device(struct hid_device *hdev)
 	schedule_work(&release_work);
 }
 
-noinline bool
-call_hid_bpf_prog_release(u64 prog_key, int table_cnt)
+void call_hid_bpf_prog_put_deferred(struct work_struct *work)
 {
-	/* compare with how many refs are left in the bpf program */
-	struct bpf_prog *prog = (struct bpf_prog *)prog_key;
-	int idx;
-
-	if (!prog)
-		return false;
+	struct bpf_prog_aux *aux;
+	struct bpf_prog *prog;
+	bool found = false;
+	int i;
 
-	if (atomic64_read(&prog->aux->refcnt) != table_cnt)
-		return false;
+	aux = container_of(work, struct bpf_prog_aux, work);
+	prog = aux->prog;
 
 	/* we don't need locking here because the entries in the progs table
 	 * are stable:
 	 * if there are other users (and the progs entries might change), we
-	 * would return in the statement above.
+	 * would simply not have been called.
 	 */
-	for (idx = 0; idx < HID_BPF_MAX_PROGS; idx++) {
-		if (jmp_table.progs[idx] == prog) {
-			__clear_bit(idx, jmp_table.enabled);
-			break;
+	for (i = 0; i < HID_BPF_MAX_PROGS; i++) {
+		if (jmp_table.progs[i] == prog) {
+			__clear_bit(i, jmp_table.enabled);
+			found = true;
 		}
 	}
-	if (idx >= HID_BPF_MAX_PROGS) {
-		/* should never happen if we get our refcount right */
-		idx = -1;
-	}
 
-	/* schedule release of all detached progs */
-	schedule_work(&release_work);
-	return idx >= 0;
+	if (found)
+		/* schedule release of all detached progs */
+		schedule_work(&release_work);
+}
+
+static void hid_bpf_prog_fd_array_put_ptr(void *ptr)
+{
 }
 
-#define HID_BPF_PROGS_COUNT 3
+#define HID_BPF_PROGS_COUNT 2
 
 static struct bpf_link *links[HID_BPF_PROGS_COUNT];
 static struct entrypoints_bpf *skel;
@@ -501,9 +491,6 @@ void hid_bpf_free_links_and_skel(void)
 	int i;
 
 	/* the following is enough to release all programs attached to hid */
-	if (jmp_table.prog_keys)
-		bpf_map_put_with_uref(jmp_table.prog_keys);
-
 	if (jmp_table.map)
 		bpf_map_put_with_uref(jmp_table.map);
 
@@ -533,6 +520,8 @@ void hid_bpf_free_links_and_skel(void)
 	idx++;									\
 } while (0)
 
+static struct bpf_map_ops hid_bpf_prog_fd_maps_ops;
+
 int hid_bpf_preload_skel(void)
 {
 	int err, idx = 0;
@@ -551,15 +540,14 @@ int hid_bpf_preload_skel(void)
 		goto out;
 	}
 
-	jmp_table.prog_keys = bpf_map_get_with_uref(skel->maps.progs_map.map_fd);
-	if (IS_ERR(jmp_table.prog_keys)) {
-		err = PTR_ERR(jmp_table.prog_keys);
-		goto out;
-	}
+	/* our jump table is stealing refs, so we should not decrement on removal of elements */
+	hid_bpf_prog_fd_maps_ops = *jmp_table.map->ops;
+	hid_bpf_prog_fd_maps_ops.map_fd_put_ptr = hid_bpf_prog_fd_array_put_ptr;
+
+	jmp_table.map->ops = &hid_bpf_prog_fd_maps_ops;
 
 	ATTACH_AND_STORE_LINK(hid_tail_call);
-	ATTACH_AND_STORE_LINK(hid_prog_release);
-	ATTACH_AND_STORE_LINK(hid_free_inode);
+	ATTACH_AND_STORE_LINK(hid_bpf_prog_put_deferred);
 
 	return 0;
 out:
-- 
cgit v1.2.3


From 658ee5a64fcfbbf758447fa3af425729eaabb0dc Mon Sep 17 00:00:00 2001
From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Date: Thu, 3 Nov 2022 16:57:47 +0100
Subject: HID: bpf: allocate data memory for device_event BPF programs

We need to also be able to change the size of the report.
Reducing it is easy, because we already have the incoming buffer that is
big enough, but extending it is harder.

Pre-allocate a buffer that is big enough to handle all reports of the
device, and use that as the primary buffer for BPF programs.
To be able to change the size of the buffer, we change the device_event
API and request it to return the size of the buffer.

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
 drivers/hid/bpf/hid_bpf_dispatch.c  | 116 ++++++++++++++++++++++++++++++++----
 drivers/hid/bpf/hid_bpf_jmp_table.c |   4 +-
 drivers/hid/hid-core.c              |  12 +++-
 3 files changed, 119 insertions(+), 13 deletions(-)

(limited to 'drivers')

diff --git a/drivers/hid/bpf/hid_bpf_dispatch.c b/drivers/hid/bpf/hid_bpf_dispatch.c
index 0ef99caf937a..efd4e4b4a615 100644
--- a/drivers/hid/bpf/hid_bpf_dispatch.c
+++ b/drivers/hid/bpf/hid_bpf_dispatch.c
@@ -28,8 +28,9 @@ EXPORT_SYMBOL(hid_bpf_ops);
  *
  * @ctx: The HID-BPF context
  *
- * @return %0 on success and keep processing; a negative error code to interrupt
- * the processing of this event
+ * @return %0 on success and keep processing; a positive value to change the
+ * incoming size buffer; a negative error code to interrupt the processing
+ * of this event
  *
  * Declare an %fmod_ret tracing bpf program to this function and attach this
  * program through hid_bpf_attach_prog() to have this helper called for
@@ -44,23 +45,43 @@ __weak noinline int hid_bpf_device_event(struct hid_bpf_ctx *ctx)
 }
 ALLOW_ERROR_INJECTION(hid_bpf_device_event, ERRNO);
 
-int
+u8 *
 dispatch_hid_bpf_device_event(struct hid_device *hdev, enum hid_report_type type, u8 *data,
-			      u32 size, int interrupt)
+			      u32 *size, int interrupt)
 {
 	struct hid_bpf_ctx_kern ctx_kern = {
 		.ctx = {
 			.hid = hdev,
 			.report_type = type,
-			.size = size,
+			.allocated_size = hdev->bpf.allocated_data,
+			.size = *size,
 		},
-		.data = data,
+		.data = hdev->bpf.device_data,
 	};
+	int ret;
 
 	if (type >= HID_REPORT_TYPES)
-		return -EINVAL;
+		return ERR_PTR(-EINVAL);
+
+	/* no program has been attached yet */
+	if (!hdev->bpf.device_data)
+		return data;
+
+	memset(ctx_kern.data, 0, hdev->bpf.allocated_data);
+	memcpy(ctx_kern.data, data, *size);
+
+	ret = hid_bpf_prog_run(hdev, HID_BPF_PROG_TYPE_DEVICE_EVENT, &ctx_kern);
+	if (ret < 0)
+		return ERR_PTR(ret);
+
+	if (ret) {
+		if (ret > ctx_kern.ctx.allocated_size)
+			return ERR_PTR(-EINVAL);
 
-	return hid_bpf_prog_run(hdev, HID_BPF_PROG_TYPE_DEVICE_EVENT, &ctx_kern);
+		*size = ret;
+	}
+
+	return ctx_kern.data;
 }
 EXPORT_SYMBOL_GPL(dispatch_hid_bpf_device_event);
 
@@ -83,7 +104,7 @@ hid_bpf_get_data(struct hid_bpf_ctx *ctx, unsigned int offset, const size_t rdwr
 
 	ctx_kern = container_of(ctx, struct hid_bpf_ctx_kern, ctx);
 
-	if (rdwr_buf_size + offset > ctx->size)
+	if (rdwr_buf_size + offset > ctx->allocated_size)
 		return NULL;
 
 	return ctx_kern->data + offset;
@@ -110,6 +131,51 @@ static int device_match_id(struct device *dev, const void *id)
 	return hdev->id == *(int *)id;
 }
 
+static int __hid_bpf_allocate_data(struct hid_device *hdev, u8 **data, u32 *size)
+{
+	u8 *alloc_data;
+	unsigned int i, j, max_report_len = 0;
+	size_t alloc_size = 0;
+
+	/* compute the maximum report length for this device */
+	for (i = 0; i < HID_REPORT_TYPES; i++) {
+		struct hid_report_enum *report_enum = hdev->report_enum + i;
+
+		for (j = 0; j < HID_MAX_IDS; j++) {
+			struct hid_report *report = report_enum->report_id_hash[j];
+
+			if (report)
+				max_report_len = max(max_report_len, hid_report_len(report));
+		}
+	}
+
+	/*
+	 * Give us a little bit of extra space and some predictability in the
+	 * buffer length we create. This way, we can tell users that they can
+	 * work on chunks of 64 bytes of memory without having the bpf verifier
+	 * scream at them.
+	 */
+	alloc_size = DIV_ROUND_UP(max_report_len, 64) * 64;
+
+	alloc_data = kzalloc(alloc_size, GFP_KERNEL);
+	if (!alloc_data)
+		return -ENOMEM;
+
+	*data = alloc_data;
+	*size = alloc_size;
+
+	return 0;
+}
+
+static int hid_bpf_allocate_event_data(struct hid_device *hdev)
+{
+	/* hdev->bpf.device_data is already allocated, abort */
+	if (hdev->bpf.device_data)
+		return 0;
+
+	return __hid_bpf_allocate_data(hdev, &hdev->bpf.device_data, &hdev->bpf.allocated_data);
+}
+
 /**
  * hid_bpf_attach_prog - Attach the given @prog_fd to the given HID device
  *
@@ -125,7 +191,7 @@ hid_bpf_attach_prog(unsigned int hid_id, int prog_fd, __u32 flags)
 {
 	struct hid_device *hdev;
 	struct device *dev;
-	int prog_type = hid_bpf_get_prog_attach_type(prog_fd);
+	int err, prog_type = hid_bpf_get_prog_attach_type(prog_fd);
 
 	if (!hid_bpf_ops)
 		return -EINVAL;
@@ -145,6 +211,12 @@ hid_bpf_attach_prog(unsigned int hid_id, int prog_fd, __u32 flags)
 
 	hdev = to_hid_device(dev);
 
+	if (prog_type == HID_BPF_PROG_TYPE_DEVICE_EVENT) {
+		err = hid_bpf_allocate_event_data(hdev);
+		if (err)
+			return err;
+	}
+
 	return __hid_bpf_attach_prog(hdev, prog_type, prog_fd, flags);
 }
 
@@ -158,6 +230,30 @@ static const struct btf_kfunc_id_set hid_bpf_syscall_kfunc_set = {
 	.set   = &hid_bpf_syscall_kfunc_ids,
 };
 
+int hid_bpf_connect_device(struct hid_device *hdev)
+{
+	struct hid_bpf_prog_list *prog_list;
+
+	rcu_read_lock();
+	prog_list = rcu_dereference(hdev->bpf.progs[HID_BPF_PROG_TYPE_DEVICE_EVENT]);
+	rcu_read_unlock();
+
+	/* only allocate BPF data if there are programs attached */
+	if (!prog_list)
+		return 0;
+
+	return hid_bpf_allocate_event_data(hdev);
+}
+EXPORT_SYMBOL_GPL(hid_bpf_connect_device);
+
+void hid_bpf_disconnect_device(struct hid_device *hdev)
+{
+	kfree(hdev->bpf.device_data);
+	hdev->bpf.device_data = NULL;
+	hdev->bpf.allocated_data = 0;
+}
+EXPORT_SYMBOL_GPL(hid_bpf_disconnect_device);
+
 void hid_bpf_destroy_device(struct hid_device *hdev)
 {
 	if (!hdev)
diff --git a/drivers/hid/bpf/hid_bpf_jmp_table.c b/drivers/hid/bpf/hid_bpf_jmp_table.c
index e5f171ab480c..bfcdd7b805a9 100644
--- a/drivers/hid/bpf/hid_bpf_jmp_table.c
+++ b/drivers/hid/bpf/hid_bpf_jmp_table.c
@@ -122,8 +122,10 @@ int hid_bpf_prog_run(struct hid_device *hdev, enum hid_bpf_prog_type type,
 
 		ctx_kern->ctx.index = idx;
 		err = __hid_bpf_tail_call(&ctx_kern->ctx);
-		if (err)
+		if (err < 0)
 			break;
+		if (err)
+			ctx_kern->ctx.retval = err;
 	}
 
  out_unlock:
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 1098c49b5d2e..400a7b8133c6 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -2040,9 +2040,11 @@ int hid_input_report(struct hid_device *hid, enum hid_report_type type, u8 *data
 	report_enum = hid->report_enum + type;
 	hdrv = hid->driver;
 
-	ret = dispatch_hid_bpf_device_event(hid, type, data, size, interrupt);
-	if (ret)
+	data = dispatch_hid_bpf_device_event(hid, type, data, &size, interrupt);
+	if (IS_ERR(data)) {
+		ret = PTR_ERR(data);
 		goto unlock;
+	}
 
 	if (!size) {
 		dbg_hid("empty report\n");
@@ -2158,6 +2160,10 @@ int hid_connect(struct hid_device *hdev, unsigned int connect_mask)
 	int len;
 	int ret;
 
+	ret = hid_bpf_connect_device(hdev);
+	if (ret)
+		return ret;
+
 	if (hdev->quirks & HID_QUIRK_HIDDEV_FORCE)
 		connect_mask |= (HID_CONNECT_HIDDEV_FORCE | HID_CONNECT_HIDDEV);
 	if (hdev->quirks & HID_QUIRK_HIDINPUT_FORCE)
@@ -2259,6 +2265,8 @@ void hid_disconnect(struct hid_device *hdev)
 	if (hdev->claimed & HID_CLAIMED_HIDRAW)
 		hidraw_disconnect(hdev);
 	hdev->claimed = 0;
+
+	hid_bpf_disconnect_device(hdev);
 }
 EXPORT_SYMBOL_GPL(hid_disconnect);
 
-- 
cgit v1.2.3


From 91a7f802d1852f60139712bdcfa98db547ce0531 Mon Sep 17 00:00:00 2001
From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Date: Thu, 3 Nov 2022 16:57:49 +0100
Subject: HID: bpf: introduce hid_hw_request()

This function can not be called under IRQ, thus it is only available
while in SEC("syscall").
For consistency, this function requires a HID-BPF context to work with,
and so we also provide a helper to create one based on the HID unique
ID.

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>

--

changes in v12:
- variable dereferenced before check 'ctx'
  |Reported-by: kernel test robot <lkp@intel.com>
  |Reported-by: Dan Carpenter <error27@gmail.com>

no changes in v11

no changes in v10

changes in v9:
- fixed kfunc declaration aaccording to latest upstream changes

no changes in v8

changes in v7:
- hid_bpf_allocate_context: remove unused variable
- ensures buf is not NULL

changes in v6:
- rename parameter size into buf__sz to teach the verifier about
  the actual buffer size used by the call
- remove the allocated data in the user created context, it's not used

new-ish in v5
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
 drivers/hid/bpf/hid_bpf_dispatch.c | 134 +++++++++++++++++++++++++++++++++++++
 drivers/hid/hid-core.c             |   2 +
 2 files changed, 136 insertions(+)

(limited to 'drivers')

diff --git a/drivers/hid/bpf/hid_bpf_dispatch.c b/drivers/hid/bpf/hid_bpf_dispatch.c
index efd4e4b4a615..0fe856d67f12 100644
--- a/drivers/hid/bpf/hid_bpf_dispatch.c
+++ b/drivers/hid/bpf/hid_bpf_dispatch.c
@@ -220,9 +220,143 @@ hid_bpf_attach_prog(unsigned int hid_id, int prog_fd, __u32 flags)
 	return __hid_bpf_attach_prog(hdev, prog_type, prog_fd, flags);
 }
 
+/**
+ * hid_bpf_allocate_context - Allocate a context to the given HID device
+ *
+ * @hid_id: the system unique identifier of the HID device
+ *
+ * @returns A pointer to &struct hid_bpf_ctx on success, %NULL on error.
+ */
+noinline struct hid_bpf_ctx *
+hid_bpf_allocate_context(unsigned int hid_id)
+{
+	struct hid_device *hdev;
+	struct hid_bpf_ctx_kern *ctx_kern = NULL;
+	struct device *dev;
+
+	if (!hid_bpf_ops)
+		return NULL;
+
+	dev = bus_find_device(hid_bpf_ops->bus_type, NULL, &hid_id, device_match_id);
+	if (!dev)
+		return NULL;
+
+	hdev = to_hid_device(dev);
+
+	ctx_kern = kzalloc(sizeof(*ctx_kern), GFP_KERNEL);
+	if (!ctx_kern)
+		return NULL;
+
+	ctx_kern->ctx.hid = hdev;
+
+	return &ctx_kern->ctx;
+}
+
+/**
+ * hid_bpf_release_context - Release the previously allocated context @ctx
+ *
+ * @ctx: the HID-BPF context to release
+ *
+ */
+noinline void
+hid_bpf_release_context(struct hid_bpf_ctx *ctx)
+{
+	struct hid_bpf_ctx_kern *ctx_kern;
+
+	if (!ctx)
+		return;
+
+	ctx_kern = container_of(ctx, struct hid_bpf_ctx_kern, ctx);
+
+	kfree(ctx_kern);
+}
+
+/**
+ * hid_bpf_hw_request - Communicate with a HID device
+ *
+ * @ctx: the HID-BPF context previously allocated in hid_bpf_allocate_context()
+ * @buf: a %PTR_TO_MEM buffer
+ * @buf__sz: the size of the data to transfer
+ * @rtype: the type of the report (%HID_INPUT_REPORT, %HID_FEATURE_REPORT, %HID_OUTPUT_REPORT)
+ * @reqtype: the type of the request (%HID_REQ_GET_REPORT, %HID_REQ_SET_REPORT, ...)
+ *
+ * @returns %0 on success, a negative error code otherwise.
+ */
+noinline int
+hid_bpf_hw_request(struct hid_bpf_ctx *ctx, __u8 *buf, size_t buf__sz,
+		   enum hid_report_type rtype, enum hid_class_request reqtype)
+{
+	struct hid_device *hdev;
+	struct hid_report *report;
+	struct hid_report_enum *report_enum;
+	u8 *dma_data;
+	u32 report_len;
+	int ret;
+
+	/* check arguments */
+	if (!ctx || !hid_bpf_ops || !buf)
+		return -EINVAL;
+
+	switch (rtype) {
+	case HID_INPUT_REPORT:
+	case HID_OUTPUT_REPORT:
+	case HID_FEATURE_REPORT:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	switch (reqtype) {
+	case HID_REQ_GET_REPORT:
+	case HID_REQ_GET_IDLE:
+	case HID_REQ_GET_PROTOCOL:
+	case HID_REQ_SET_REPORT:
+	case HID_REQ_SET_IDLE:
+	case HID_REQ_SET_PROTOCOL:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	if (buf__sz < 1)
+		return -EINVAL;
+
+	hdev = (struct hid_device *)ctx->hid; /* discard const */
+
+	report_enum = hdev->report_enum + rtype;
+	report = hid_bpf_ops->hid_get_report(report_enum, buf);
+	if (!report)
+		return -EINVAL;
+
+	report_len = hid_report_len(report);
+
+	if (buf__sz > report_len)
+		buf__sz = report_len;
+
+	dma_data = kmemdup(buf, buf__sz, GFP_KERNEL);
+	if (!dma_data)
+		return -ENOMEM;
+
+	ret = hid_bpf_ops->hid_hw_raw_request(hdev,
+					      dma_data[0],
+					      dma_data,
+					      buf__sz,
+					      rtype,
+					      reqtype);
+
+	if (ret > 0)
+		memcpy(buf, dma_data, ret);
+
+	kfree(dma_data);
+	return ret;
+}
+
 /* for syscall HID-BPF */
 BTF_SET8_START(hid_bpf_syscall_kfunc_ids)
 BTF_ID_FLAGS(func, hid_bpf_attach_prog)
+BTF_ID_FLAGS(func, hid_bpf_allocate_context, KF_ACQUIRE | KF_RET_NULL)
+BTF_ID_FLAGS(func, hid_bpf_release_context, KF_RELEASE)
+BTF_ID_FLAGS(func, hid_bpf_hw_request)
 BTF_SET8_END(hid_bpf_syscall_kfunc_ids)
 
 static const struct btf_kfunc_id_set hid_bpf_syscall_kfunc_set = {
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 400a7b8133c6..6bf47e352f23 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -2919,6 +2919,8 @@ EXPORT_SYMBOL_GPL(hid_check_keys_pressed);
 
 #ifdef CONFIG_HID_BPF
 static struct hid_bpf_ops hid_ops = {
+	.hid_get_report = hid_get_report,
+	.hid_hw_raw_request = hid_hw_raw_request,
 	.owner = THIS_MODULE,
 	.bus_type = &hid_bus_type,
 };
-- 
cgit v1.2.3


From ad190df11a024c1214fbc8dcaab72c592c79d9b5 Mon Sep 17 00:00:00 2001
From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Date: Thu, 3 Nov 2022 16:57:51 +0100
Subject: HID: bpf: allow to change the report descriptor

Add a new tracepoint hid_bpf_rdesc_fixup() so we can trigger a
report descriptor fixup in the bpf world.

Whenever the program gets attached/detached, the device is reconnected
meaning that userspace will see it disappearing and reappearing with
the new report descriptor.

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
 drivers/hid/bpf/hid_bpf_dispatch.c  | 80 ++++++++++++++++++++++++++++++++++++-
 drivers/hid/bpf/hid_bpf_dispatch.h  |  1 +
 drivers/hid/bpf/hid_bpf_jmp_table.c |  7 ++++
 drivers/hid/hid-core.c              |  3 +-
 4 files changed, 89 insertions(+), 2 deletions(-)

(limited to 'drivers')

diff --git a/drivers/hid/bpf/hid_bpf_dispatch.c b/drivers/hid/bpf/hid_bpf_dispatch.c
index 0fe856d67f12..c3920c7964dc 100644
--- a/drivers/hid/bpf/hid_bpf_dispatch.c
+++ b/drivers/hid/bpf/hid_bpf_dispatch.c
@@ -15,6 +15,7 @@
 #include <linux/hid_bpf.h>
 #include <linux/init.h>
 #include <linux/kfifo.h>
+#include <linux/minmax.h>
 #include <linux/module.h>
 #include <linux/workqueue.h>
 #include "hid_bpf_dispatch.h"
@@ -85,6 +86,65 @@ dispatch_hid_bpf_device_event(struct hid_device *hdev, enum hid_report_type type
 }
 EXPORT_SYMBOL_GPL(dispatch_hid_bpf_device_event);
 
+/**
+ * hid_bpf_rdesc_fixup - Called when the probe function parses the report
+ * descriptor of the HID device
+ *
+ * @ctx: The HID-BPF context
+ *
+ * @return 0 on success and keep processing; a positive value to change the
+ * incoming size buffer; a negative error code to interrupt the processing
+ * of this event
+ *
+ * Declare an %fmod_ret tracing bpf program to this function and attach this
+ * program through hid_bpf_attach_prog() to have this helper called before any
+ * parsing of the report descriptor by HID.
+ */
+/* never used by the kernel but declared so we can load and attach a tracepoint */
+__weak noinline int hid_bpf_rdesc_fixup(struct hid_bpf_ctx *ctx)
+{
+	return 0;
+}
+ALLOW_ERROR_INJECTION(hid_bpf_rdesc_fixup, ERRNO);
+
+u8 *call_hid_bpf_rdesc_fixup(struct hid_device *hdev, u8 *rdesc, unsigned int *size)
+{
+	int ret;
+	struct hid_bpf_ctx_kern ctx_kern = {
+		.ctx = {
+			.hid = hdev,
+			.size = *size,
+			.allocated_size = HID_MAX_DESCRIPTOR_SIZE,
+		},
+	};
+
+	ctx_kern.data = kzalloc(ctx_kern.ctx.allocated_size, GFP_KERNEL);
+	if (!ctx_kern.data)
+		goto ignore_bpf;
+
+	memcpy(ctx_kern.data, rdesc, min_t(unsigned int, *size, HID_MAX_DESCRIPTOR_SIZE));
+
+	ret = hid_bpf_prog_run(hdev, HID_BPF_PROG_TYPE_RDESC_FIXUP, &ctx_kern);
+	if (ret < 0)
+		goto ignore_bpf;
+
+	if (ret) {
+		if (ret > ctx_kern.ctx.allocated_size)
+			goto ignore_bpf;
+
+		*size = ret;
+	}
+
+	rdesc = krealloc(ctx_kern.data, *size, GFP_KERNEL);
+
+	return rdesc;
+
+ ignore_bpf:
+	kfree(ctx_kern.data);
+	return kmemdup(rdesc, *size, GFP_KERNEL);
+}
+EXPORT_SYMBOL_GPL(call_hid_bpf_rdesc_fixup);
+
 /**
  * hid_bpf_get_data - Get the kernel memory pointer associated with the context @ctx
  *
@@ -176,6 +236,14 @@ static int hid_bpf_allocate_event_data(struct hid_device *hdev)
 	return __hid_bpf_allocate_data(hdev, &hdev->bpf.device_data, &hdev->bpf.allocated_data);
 }
 
+int hid_bpf_reconnect(struct hid_device *hdev)
+{
+	if (!test_and_set_bit(ffs(HID_STAT_REPROBED), &hdev->status))
+		return device_reprobe(&hdev->dev);
+
+	return 0;
+}
+
 /**
  * hid_bpf_attach_prog - Attach the given @prog_fd to the given HID device
  *
@@ -217,7 +285,17 @@ hid_bpf_attach_prog(unsigned int hid_id, int prog_fd, __u32 flags)
 			return err;
 	}
 
-	return __hid_bpf_attach_prog(hdev, prog_type, prog_fd, flags);
+	err = __hid_bpf_attach_prog(hdev, prog_type, prog_fd, flags);
+	if (err)
+		return err;
+
+	if (prog_type == HID_BPF_PROG_TYPE_RDESC_FIXUP) {
+		err = hid_bpf_reconnect(hdev);
+		if (err)
+			return err;
+	}
+
+	return 0;
 }
 
 /**
diff --git a/drivers/hid/bpf/hid_bpf_dispatch.h b/drivers/hid/bpf/hid_bpf_dispatch.h
index e2d64faa3932..2eeab1f746dd 100644
--- a/drivers/hid/bpf/hid_bpf_dispatch.h
+++ b/drivers/hid/bpf/hid_bpf_dispatch.h
@@ -18,6 +18,7 @@ int __hid_bpf_attach_prog(struct hid_device *hdev, enum hid_bpf_prog_type prog_t
 void __hid_bpf_destroy_device(struct hid_device *hdev);
 int hid_bpf_prog_run(struct hid_device *hdev, enum hid_bpf_prog_type type,
 		     struct hid_bpf_ctx_kern *ctx_kern);
+int hid_bpf_reconnect(struct hid_device *hdev);
 
 struct bpf_prog;
 
diff --git a/drivers/hid/bpf/hid_bpf_jmp_table.c b/drivers/hid/bpf/hid_bpf_jmp_table.c
index bfcdd7b805a9..579a6c06906e 100644
--- a/drivers/hid/bpf/hid_bpf_jmp_table.c
+++ b/drivers/hid/bpf/hid_bpf_jmp_table.c
@@ -58,12 +58,15 @@ static DECLARE_WORK(release_work, hid_bpf_release_progs);
 
 BTF_ID_LIST(hid_bpf_btf_ids)
 BTF_ID(func, hid_bpf_device_event)			/* HID_BPF_PROG_TYPE_DEVICE_EVENT */
+BTF_ID(func, hid_bpf_rdesc_fixup)			/* HID_BPF_PROG_TYPE_RDESC_FIXUP */
 
 static int hid_bpf_max_programs(enum hid_bpf_prog_type type)
 {
 	switch (type) {
 	case HID_BPF_PROG_TYPE_DEVICE_EVENT:
 		return HID_BPF_MAX_PROGS_PER_DEV;
+	case HID_BPF_PROG_TYPE_RDESC_FIXUP:
+		return 1;
 	default:
 		return -EINVAL;
 	}
@@ -233,6 +236,10 @@ static void hid_bpf_release_progs(struct work_struct *work)
 				if (next->hdev == hdev && next->type == type)
 					next->hdev = NULL;
 			}
+
+			/* if type was rdesc fixup, reconnect device */
+			if (type == HID_BPF_PROG_TYPE_RDESC_FIXUP)
+				hid_bpf_reconnect(hdev);
 		}
 	}
 
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 6bf47e352f23..fa4436b8101e 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -1218,7 +1218,8 @@ int hid_open_report(struct hid_device *device)
 		return -ENODEV;
 	size = device->dev_rsize;
 
-	buf = kmemdup(start, size, GFP_KERNEL);
+	/* call_hid_bpf_rdesc_fixup() ensures we work on a copy of rdesc */
+	buf = call_hid_bpf_rdesc_fixup(device, start, &size);
 	if (buf == NULL)
 		return -ENOMEM;
 
-- 
cgit v1.2.3


From 7e41b2e9776d85950896d9e117a525a44bb6ce92 Mon Sep 17 00:00:00 2001
From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Date: Fri, 18 Nov 2022 11:54:48 +0100
Subject: HID: force HID depending on INPUT

In most configurations, INPUT is actually a boolean: either y or disabled,
but when it's disabled, you can't do much on your average laptop.

But it turns out that there is a possibility to have INPUT as a module:
you have to disable VT and TTY (of course), but also enable EXPERT.
I'll leave how to disable VT and TTY as an exercise for the bravest.

Anyway, if INPUT is m, we can still configure HID as y, which is not
correct because hid-input.c depends on the input API, meaning that
vmlinuz can not link.

So: add depends on INPUT too at the HID level, to ensure that if INPUT=m,
HID can only be m or disabled.

Fixes: 25621bcc8976 ("HID: Kconfig: split HID support and hid-core compilation")
Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/r/202211181742.QYJY6Gug-lkp@intel.com
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
 drivers/hid/Kconfig | 1 +
 1 file changed, 1 insertion(+)

(limited to 'drivers')

diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index ff40c18f4a2b..b345bbfb57bf 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -15,6 +15,7 @@ if HID_SUPPORT
 config HID
 	tristate "HID bus core support"
 	default y
+	depends on INPUT
 	help
 	  A human interface device (HID) is a type of computer device that
 	  interacts directly with and takes input from humans. The term "HID"
-- 
cgit v1.2.3


From 86020156c8840f2a47430f028e6ab557d8a9ed27 Mon Sep 17 00:00:00 2001
From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Date: Tue, 6 Dec 2022 15:59:33 +0100
Subject: HID: bpf: do not rely on ALLOW_ERROR_INJECTION

Now that we have  aproper non debug API to declare which function is
fmodret, we can rely on it.

Link: https://lore.kernel.org/all/20221121104403.1545f9b5@gandalf.local.home/
Suggested-by: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Link: https://lore.kernel.org/r/20221206145936.922196-3-benjamin.tissoires@redhat.com
---
 drivers/hid/bpf/hid_bpf_dispatch.c  | 20 ++++++++++++++++++--
 drivers/hid/bpf/hid_bpf_jmp_table.c |  1 -
 2 files changed, 18 insertions(+), 3 deletions(-)

(limited to 'drivers')

diff --git a/drivers/hid/bpf/hid_bpf_dispatch.c b/drivers/hid/bpf/hid_bpf_dispatch.c
index c3920c7964dc..58e608ebf0fa 100644
--- a/drivers/hid/bpf/hid_bpf_dispatch.c
+++ b/drivers/hid/bpf/hid_bpf_dispatch.c
@@ -44,7 +44,6 @@ __weak noinline int hid_bpf_device_event(struct hid_bpf_ctx *ctx)
 {
 	return 0;
 }
-ALLOW_ERROR_INJECTION(hid_bpf_device_event, ERRNO);
 
 u8 *
 dispatch_hid_bpf_device_event(struct hid_device *hdev, enum hid_report_type type, u8 *data,
@@ -105,7 +104,6 @@ __weak noinline int hid_bpf_rdesc_fixup(struct hid_bpf_ctx *ctx)
 {
 	return 0;
 }
-ALLOW_ERROR_INJECTION(hid_bpf_rdesc_fixup, ERRNO);
 
 u8 *call_hid_bpf_rdesc_fixup(struct hid_device *hdev, u8 *rdesc, unsigned int *size)
 {
@@ -429,6 +427,18 @@ hid_bpf_hw_request(struct hid_bpf_ctx *ctx, __u8 *buf, size_t buf__sz,
 	return ret;
 }
 
+/* our HID-BPF entrypoints */
+BTF_SET8_START(hid_bpf_fmodret_ids)
+BTF_ID_FLAGS(func, hid_bpf_device_event)
+BTF_ID_FLAGS(func, hid_bpf_rdesc_fixup)
+BTF_ID_FLAGS(func, __hid_bpf_tail_call)
+BTF_SET8_END(hid_bpf_fmodret_ids)
+
+static const struct btf_kfunc_id_set hid_bpf_fmodret_set = {
+	.owner = THIS_MODULE,
+	.set   = &hid_bpf_fmodret_ids,
+};
+
 /* for syscall HID-BPF */
 BTF_SET8_START(hid_bpf_syscall_kfunc_ids)
 BTF_ID_FLAGS(func, hid_bpf_attach_prog)
@@ -495,6 +505,12 @@ static int __init hid_bpf_init(void)
 	 * will not be available, so nobody will be able to use the functionality.
 	 */
 
+	err = register_btf_fmodret_id_set(&hid_bpf_fmodret_set);
+	if (err) {
+		pr_warn("error while registering fmodret entrypoints: %d", err);
+		return 0;
+	}
+
 	err = register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING, &hid_bpf_kfunc_set);
 	if (err) {
 		pr_warn("error while setting HID BPF tracing kfuncs: %d", err);
diff --git a/drivers/hid/bpf/hid_bpf_jmp_table.c b/drivers/hid/bpf/hid_bpf_jmp_table.c
index 579a6c06906e..207972b028d9 100644
--- a/drivers/hid/bpf/hid_bpf_jmp_table.c
+++ b/drivers/hid/bpf/hid_bpf_jmp_table.c
@@ -103,7 +103,6 @@ __weak noinline int __hid_bpf_tail_call(struct hid_bpf_ctx *ctx)
 {
 	return 0;
 }
-ALLOW_ERROR_INJECTION(__hid_bpf_tail_call, ERRNO);
 
 int hid_bpf_prog_run(struct hid_device *hdev, enum hid_bpf_prog_type type,
 		     struct hid_bpf_ctx_kern *ctx_kern)
-- 
cgit v1.2.3


From 4e0b1b0731bd355a4dee279a270bdd5b29e68b85 Mon Sep 17 00:00:00 2001
From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Date: Tue, 6 Dec 2022 15:59:34 +0100
Subject: HID: bpf: enforce HID_BPF dependencies

As mentioned in the link below, having JIT and BPF is not enough to
have fentry/fexit/fmod_ret APIs. This resolves the error that
happens on a system without tracing enabled when hid-bpf tries to
load itself.

Link: https://lore.kernel.org/r/CABRcYmKyRchQhabi1Vd9RcMQFCcb=EtWyEbFDFRTc-L-U8WhgA@mail.gmail.com
Fixes: f5c27da4e3c8 ("HID: initial BPF implementation")
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Reviewed-by: Florent Revest <revest@chromium.org>
Reviewed-by: Jiri Kosina <jkosina@suse.cz>
Link: https://lore.kernel.org/r/20221206145936.922196-4-benjamin.tissoires@redhat.com
---
 drivers/hid/bpf/Kconfig | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'drivers')

diff --git a/drivers/hid/bpf/Kconfig b/drivers/hid/bpf/Kconfig
index 298634fc3335..03f52145b83b 100644
--- a/drivers/hid/bpf/Kconfig
+++ b/drivers/hid/bpf/Kconfig
@@ -4,7 +4,8 @@ menu "HID-BPF support"
 config HID_BPF
 	bool "HID-BPF support"
 	default HID_SUPPORT
-	depends on BPF && BPF_SYSCALL
+	depends on BPF && BPF_SYSCALL && \
+		   DYNAMIC_FTRACE_WITH_DIRECT_CALLS
 	help
 	This option allows to support eBPF programs on the HID subsystem.
 	eBPF programs can fix HID devices in a lighter way than a full
-- 
cgit v1.2.3


From bf7660dab30dfb43fcdd3c73b1f526e53f78b76c Mon Sep 17 00:00:00 2001
From: Arnd Bergmann <arnd@arndb.de>
Date: Tue, 17 Jan 2023 18:20:55 +0100
Subject: HID: stop drivers from selecting CONFIG_HID

There is a mix of drivers using either 'depends on HID' or 'select HID',
which causes both circular dependencies and missed dependencies for
a 'select':

WARNING: unment direct dependencies for HID
  Depends on [m]: HID_SUPPORT [=y] && INPUT [=m]
  Selected by [y]:
  - AMD_SFH_HID [=y] && HID_SUPPORT [=y] && (X86_64 || COMPILE_TEST [=y]) && PCI [=y]
  Selected by [m]:
  - I2C_HID_CORE [=m] && HID_SUPPORT [=y]

WARNING: unmet direct dependencies detected for INPUT_FF_MEMLESS
  Depends on [m]: INPUT [=m]
  Selected by [y]:
  - DRAGONRISE_FF [=y] && HID_SUPPORT [=y] && HID [=y] && HID_DRAGONRISE [=y]
  - HID_MICROSOFT [=y] && HID_SUPPORT [=y] && HID [=y]
  - GREENASIA_FF [=y] && HID_SUPPORT [=y] && HID [=y] && HID_GREENASIA [=y]
  Selected by [m]:
  - INPUT_ARIZONA_HAPTICS [=m] && INPUT [=m] && INPUT_MISC [=y] && MFD_ARIZONA [=y] && SND_SOC [=m]
  - INPUT_PM8XXX_VIBRATOR [=m] && INPUT [=m] && INPUT_MISC [=y] && (MFD_PM8XXX [=m] || MFD_SPMI_PMIC [=n])
  - INPUT_MAX8997_HAPTIC [=m] && INPUT [=m] && INPUT_MISC [=y] && PWM [=y] && MFD_MAX8997 [=y]
  - INPUT_GPIO_VIBRA [=m] && INPUT [=m] && INPUT_MISC [=y] && (GPIOLIB [=y] || COMPILE_TEST [=y])
  - INPUT_REGULATOR_HAPTIC [=m] && INPUT [=m] && INPUT_MISC [=y] && REGULATOR [=y]
  - INPUT_TWL6040_VIBRA [=m] && INPUT [=m] && INPUT_MISC [=y] && TWL6040_CORE [=y]
  - INPUT_PWM_VIBRA [=m] && INPUT [=m] && INPUT_MISC [=y] && PWM [=y]
  - INPUT_DRV260X_HAPTICS [=m] && INPUT_MISC [=y] && INPUT [=m] && I2C [=y] && (GPIOLIB [=y] || COMPILE_TEST [=y])
  - INPUT_DRV2665_HAPTICS [=m] && INPUT_MISC [=y] && INPUT [=m] && I2C [=y]
  - INPUT_DRV2667_HAPTICS [=m] && INPUT_MISC [=y] && INPUT [=m] && I2C [=y]
  - INPUT_SC27XX_VIBRA [=m] && INPUT [=m] && INPUT_MISC [=y] && (MFD_SC27XX_PMIC [=y] || COMPILE_TEST [=y])
  - HID_MAYFLASH [=m] && HID_SUPPORT [=y] && HID [=y]

Avoid this by changing all HID client drivers to use 'depends on HID'.
For I2C_HID, this requires a larger rework of the Kconfig description,
but it hopefully becomes easier to understand without the complex
I2C_HID_CORE definition.

Fixes: 25621bcc8976 ("HID: Kconfig: split HID support and hid-core compilation")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
 drivers/hid/amd-sfh-hid/Kconfig   |  2 +-
 drivers/hid/i2c-hid/Kconfig       | 31 ++++++++++++++++---------------
 drivers/hid/intel-ish-hid/Kconfig |  2 +-
 3 files changed, 18 insertions(+), 17 deletions(-)

(limited to 'drivers')

diff --git a/drivers/hid/amd-sfh-hid/Kconfig b/drivers/hid/amd-sfh-hid/Kconfig
index 56e473fc3c93..af752dd3a340 100644
--- a/drivers/hid/amd-sfh-hid/Kconfig
+++ b/drivers/hid/amd-sfh-hid/Kconfig
@@ -5,7 +5,7 @@ menu "AMD SFH HID Support"
 
 config AMD_SFH_HID
 	tristate "AMD Sensor Fusion Hub"
-	select HID
+	depends on HID
 	help
 	  If you say yes to this option, support will be included for the
 	  AMD Sensor Fusion Hub.
diff --git a/drivers/hid/i2c-hid/Kconfig b/drivers/hid/i2c-hid/Kconfig
index 5273ee2bb134..4439be7fa74d 100644
--- a/drivers/hid/i2c-hid/Kconfig
+++ b/drivers/hid/i2c-hid/Kconfig
@@ -1,11 +1,15 @@
 # SPDX-License-Identifier: GPL-2.0-only
-menu "I2C HID support"
-	depends on I2C
+menuconfig I2C_HID
+	tristate "I2C HID support"
+	default y
+	depends on I2C && INPUT && HID
+
+if I2C_HID
 
 config I2C_HID_ACPI
 	tristate "HID over I2C transport layer ACPI driver"
-	default n
-	depends on I2C && INPUT && ACPI
+	depends on ACPI
+	select I2C_HID_CORE
 	help
 	  Say Y here if you use a keyboard, a touchpad, a touchscreen, or any
 	  other HID based devices which is connected to your computer via I2C.
@@ -19,8 +23,8 @@ config I2C_HID_ACPI
 
 config I2C_HID_OF
 	tristate "HID over I2C transport layer Open Firmware driver"
-	default n
-	depends on I2C && INPUT && OF
+	depends on OF
+	select I2C_HID_CORE
 	help
 	  Say Y here if you use a keyboard, a touchpad, a touchscreen, or any
 	  other HID based devices which is connected to your computer via I2C.
@@ -34,8 +38,8 @@ config I2C_HID_OF
 
 config I2C_HID_OF_ELAN
 	tristate "Driver for Elan hid-i2c based devices on OF systems"
-	default n
-	depends on I2C && INPUT && OF
+	depends on OF
+	select I2C_HID_CORE
 	help
 	  Say Y here if you want support for Elan i2c devices that use
 	  the i2c-hid protocol on Open Firmware (Device Tree)-based
@@ -49,8 +53,8 @@ config I2C_HID_OF_ELAN
 
 config I2C_HID_OF_GOODIX
 	tristate "Driver for Goodix hid-i2c based devices on OF systems"
-	default n
-	depends on I2C && INPUT && OF
+	depends on OF
+	select I2C_HID_CORE
 	help
 	  Say Y here if you want support for Goodix i2c devices that use
 	  the i2c-hid protocol on Open Firmware (Device Tree)-based
@@ -62,10 +66,7 @@ config I2C_HID_OF_GOODIX
 	  will be called i2c-hid-of-goodix.  It will also build/depend on
 	  the module i2c-hid.
 
-endmenu
-
 config I2C_HID_CORE
 	tristate
-	default y if I2C_HID_ACPI=y || I2C_HID_OF=y || I2C_HID_OF_GOODIX=y
-	default m if I2C_HID_ACPI=m || I2C_HID_OF=m || I2C_HID_OF_GOODIX=m
-	select HID
+endif
+
diff --git a/drivers/hid/intel-ish-hid/Kconfig b/drivers/hid/intel-ish-hid/Kconfig
index 689da84a520d..253dc10d35ef 100644
--- a/drivers/hid/intel-ish-hid/Kconfig
+++ b/drivers/hid/intel-ish-hid/Kconfig
@@ -6,7 +6,7 @@ config INTEL_ISH_HID
 	tristate "Intel Integrated Sensor Hub"
 	default n
 	depends on X86
-	select HID
+	depends on HID
 	help
 	  The Integrated Sensor Hub (ISH) enables the ability to offload
 	  sensor polling and algorithm processing to a dedicated low power
-- 
cgit v1.2.3


From 4b9a3f49f02bf682eedfde23ef56a8df82c1e5d2 Mon Sep 17 00:00:00 2001
From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Date: Fri, 13 Jan 2023 10:09:32 +0100
Subject: HID: bpf: rework how programs are attached and stored in the kernel

Previously, HID-BPF was relying on a bpf tracing program to be notified
when a program was released from userspace. This is error prone, as
LLVM sometimes inline the function and sometimes not.

So instead of messing up with the bpf prog ref count, we can use the
bpf_link concept which actually matches exactly what we want:
- a bpf_link represents the fact that a given program is attached to a
  given HID device
- as long as the bpf_link has fd opened (either by the userspace program
  still being around or by pinning the bpf object in the bpffs), the
  program stays attached to the HID device
- once every user has closed the fd, we get called by
  hid_bpf_link_release() that we no longer have any users, and we can
  disconnect the program to the device in 2 passes: first atomically clear
  the bit saying that the link is active, and then calling release_work in
  a scheduled work item.

This solves entirely the problems of BPF tracing not showing up and is
definitely cleaner.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
 drivers/hid/bpf/hid_bpf_dispatch.c  |  18 ++++--
 drivers/hid/bpf/hid_bpf_jmp_table.c | 126 +++++++++++++++++++-----------------
 2 files changed, 77 insertions(+), 67 deletions(-)

(limited to 'drivers')

diff --git a/drivers/hid/bpf/hid_bpf_dispatch.c b/drivers/hid/bpf/hid_bpf_dispatch.c
index 58e608ebf0fa..8d29fd361ab9 100644
--- a/drivers/hid/bpf/hid_bpf_dispatch.c
+++ b/drivers/hid/bpf/hid_bpf_dispatch.c
@@ -249,7 +249,9 @@ int hid_bpf_reconnect(struct hid_device *hdev)
  * @prog_fd: an fd in the user process representing the program to attach
  * @flags: any logical OR combination of &enum hid_bpf_attach_flags
  *
- * @returns %0 on success, an error code otherwise.
+ * @returns an fd of a bpf_link object on success (> %0), an error code otherwise.
+ * Closing this fd will detach the program from the HID device (unless the bpf_link
+ * is pinned to the BPF file system).
  */
 /* called from syscall */
 noinline int
@@ -257,7 +259,7 @@ hid_bpf_attach_prog(unsigned int hid_id, int prog_fd, __u32 flags)
 {
 	struct hid_device *hdev;
 	struct device *dev;
-	int err, prog_type = hid_bpf_get_prog_attach_type(prog_fd);
+	int fd, err, prog_type = hid_bpf_get_prog_attach_type(prog_fd);
 
 	if (!hid_bpf_ops)
 		return -EINVAL;
@@ -283,17 +285,19 @@ hid_bpf_attach_prog(unsigned int hid_id, int prog_fd, __u32 flags)
 			return err;
 	}
 
-	err = __hid_bpf_attach_prog(hdev, prog_type, prog_fd, flags);
-	if (err)
-		return err;
+	fd = __hid_bpf_attach_prog(hdev, prog_type, prog_fd, flags);
+	if (fd < 0)
+		return fd;
 
 	if (prog_type == HID_BPF_PROG_TYPE_RDESC_FIXUP) {
 		err = hid_bpf_reconnect(hdev);
-		if (err)
+		if (err) {
+			close_fd(fd);
 			return err;
+		}
 	}
 
-	return 0;
+	return fd;
 }
 
 /**
diff --git a/drivers/hid/bpf/hid_bpf_jmp_table.c b/drivers/hid/bpf/hid_bpf_jmp_table.c
index 207972b028d9..b7eb5c5e435f 100644
--- a/drivers/hid/bpf/hid_bpf_jmp_table.c
+++ b/drivers/hid/bpf/hid_bpf_jmp_table.c
@@ -322,16 +322,6 @@ static int hid_bpf_insert_prog(int prog_fd, struct bpf_prog *prog)
 	if (err)
 		goto out;
 
-	/*
-	 * The program has been safely inserted, decrement the reference count
-	 * so it doesn't interfere with the number of actual user handles.
-	 * This is safe to do because:
-	 * - we overrite the put_ptr in the prog fd map
-	 * - we also have a cleanup function that monitors when a program gets
-	 *   released and we manually do the cleanup in the prog fd map
-	 */
-	bpf_prog_sub(prog, 1);
-
 	/* return the index */
 	err = index;
 
@@ -365,14 +355,46 @@ int hid_bpf_get_prog_attach_type(int prog_fd)
 	return prog_type;
 }
 
+static void hid_bpf_link_release(struct bpf_link *link)
+{
+	struct hid_bpf_link *hid_link =
+		container_of(link, struct hid_bpf_link, link);
+
+	__clear_bit(hid_link->hid_table_index, jmp_table.enabled);
+	schedule_work(&release_work);
+}
+
+static void hid_bpf_link_dealloc(struct bpf_link *link)
+{
+	struct hid_bpf_link *hid_link =
+		container_of(link, struct hid_bpf_link, link);
+
+	kfree(hid_link);
+}
+
+static void hid_bpf_link_show_fdinfo(const struct bpf_link *link,
+					 struct seq_file *seq)
+{
+	seq_printf(seq,
+		   "attach_type:\tHID-BPF\n");
+}
+
+static const struct bpf_link_ops hid_bpf_link_lops = {
+	.release = hid_bpf_link_release,
+	.dealloc = hid_bpf_link_dealloc,
+	.show_fdinfo = hid_bpf_link_show_fdinfo,
+};
+
 /* called from syscall */
 noinline int
 __hid_bpf_attach_prog(struct hid_device *hdev, enum hid_bpf_prog_type prog_type,
 		      int prog_fd, __u32 flags)
 {
+	struct bpf_link_primer link_primer;
+	struct hid_bpf_link *link;
 	struct bpf_prog *prog = NULL;
 	struct hid_bpf_prog_entry *prog_entry;
-	int cnt, err = -EINVAL, prog_idx = -1;
+	int cnt, err = -EINVAL, prog_table_idx = -1;
 
 	/* take a ref on the prog itself */
 	prog = bpf_prog_get(prog_fd);
@@ -381,23 +403,32 @@ __hid_bpf_attach_prog(struct hid_device *hdev, enum hid_bpf_prog_type prog_type,
 
 	mutex_lock(&hid_bpf_attach_lock);
 
+	link = kzalloc(sizeof(*link), GFP_USER);
+	if (!link) {
+		err = -ENOMEM;
+		goto err_unlock;
+	}
+
+	bpf_link_init(&link->link, BPF_LINK_TYPE_UNSPEC,
+		      &hid_bpf_link_lops, prog);
+
 	/* do not attach too many programs to a given HID device */
 	cnt = hid_bpf_program_count(hdev, NULL, prog_type);
 	if (cnt < 0) {
 		err = cnt;
-		goto out_unlock;
+		goto err_unlock;
 	}
 
 	if (cnt >= hid_bpf_max_programs(prog_type)) {
 		err = -E2BIG;
-		goto out_unlock;
+		goto err_unlock;
 	}
 
-	prog_idx = hid_bpf_insert_prog(prog_fd, prog);
+	prog_table_idx = hid_bpf_insert_prog(prog_fd, prog);
 	/* if the jmp table is full, abort */
-	if (prog_idx < 0) {
-		err = prog_idx;
-		goto out_unlock;
+	if (prog_table_idx < 0) {
+		err = prog_table_idx;
+		goto err_unlock;
 	}
 
 	if (flags & HID_BPF_FLAG_INSERT_HEAD) {
@@ -412,22 +443,32 @@ __hid_bpf_attach_prog(struct hid_device *hdev, enum hid_bpf_prog_type prog_type,
 
 	/* we steal the ref here */
 	prog_entry->prog = prog;
-	prog_entry->idx = prog_idx;
+	prog_entry->idx = prog_table_idx;
 	prog_entry->hdev = hdev;
 	prog_entry->type = prog_type;
 
 	/* finally store the index in the device list */
 	err = hid_bpf_populate_hdev(hdev, prog_type);
+	if (err) {
+		hid_bpf_release_prog_at(prog_table_idx);
+		goto err_unlock;
+	}
+
+	link->hid_table_index = prog_table_idx;
+
+	err = bpf_link_prime(&link->link, &link_primer);
 	if (err)
-		hid_bpf_release_prog_at(prog_idx);
+		goto err_unlock;
 
- out_unlock:
 	mutex_unlock(&hid_bpf_attach_lock);
 
-	/* we only use prog as a key in the various tables, so we don't need to actually
-	 * increment the ref count.
-	 */
+	return bpf_link_settle(&link_primer);
+
+ err_unlock:
+	mutex_unlock(&hid_bpf_attach_lock);
+
 	bpf_prog_put(prog);
+	kfree(link);
 
 	return err;
 }
@@ -460,36 +501,10 @@ void __hid_bpf_destroy_device(struct hid_device *hdev)
 
 void call_hid_bpf_prog_put_deferred(struct work_struct *work)
 {
-	struct bpf_prog_aux *aux;
-	struct bpf_prog *prog;
-	bool found = false;
-	int i;
-
-	aux = container_of(work, struct bpf_prog_aux, work);
-	prog = aux->prog;
-
-	/* we don't need locking here because the entries in the progs table
-	 * are stable:
-	 * if there are other users (and the progs entries might change), we
-	 * would simply not have been called.
-	 */
-	for (i = 0; i < HID_BPF_MAX_PROGS; i++) {
-		if (jmp_table.progs[i] == prog) {
-			__clear_bit(i, jmp_table.enabled);
-			found = true;
-		}
-	}
-
-	if (found)
-		/* schedule release of all detached progs */
-		schedule_work(&release_work);
-}
-
-static void hid_bpf_prog_fd_array_put_ptr(void *ptr)
-{
+	/* kept around for patch readability, to be dropped in the next commmit */
 }
 
-#define HID_BPF_PROGS_COUNT 2
+#define HID_BPF_PROGS_COUNT 1
 
 static struct bpf_link *links[HID_BPF_PROGS_COUNT];
 static struct entrypoints_bpf *skel;
@@ -528,8 +543,6 @@ void hid_bpf_free_links_and_skel(void)
 	idx++;									\
 } while (0)
 
-static struct bpf_map_ops hid_bpf_prog_fd_maps_ops;
-
 int hid_bpf_preload_skel(void)
 {
 	int err, idx = 0;
@@ -548,14 +561,7 @@ int hid_bpf_preload_skel(void)
 		goto out;
 	}
 
-	/* our jump table is stealing refs, so we should not decrement on removal of elements */
-	hid_bpf_prog_fd_maps_ops = *jmp_table.map->ops;
-	hid_bpf_prog_fd_maps_ops.map_fd_put_ptr = hid_bpf_prog_fd_array_put_ptr;
-
-	jmp_table.map->ops = &hid_bpf_prog_fd_maps_ops;
-
 	ATTACH_AND_STORE_LINK(hid_tail_call);
-	ATTACH_AND_STORE_LINK(hid_bpf_prog_put_deferred);
 
 	return 0;
 out:
-- 
cgit v1.2.3


From bb2c0aeac145c4e5b74620fd8c0f7862777b8677 Mon Sep 17 00:00:00 2001
From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Date: Fri, 13 Jan 2023 10:09:34 +0100
Subject: HID: bpf: clean up entrypoint

We don't need to watch for calls on bpf_prog_put_deferred(), so remove
that from the entrypoints.bpf.c file.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
 drivers/hid/bpf/entrypoints/entrypoints.bpf.c   |   9 --
 drivers/hid/bpf/entrypoints/entrypoints.lskel.h | 188 +++++++-----------------
 drivers/hid/bpf/hid_bpf_dispatch.c              |   1 -
 drivers/hid/bpf/hid_bpf_dispatch.h              |   3 -
 drivers/hid/bpf/hid_bpf_jmp_table.c             |   5 -
 5 files changed, 53 insertions(+), 153 deletions(-)

(limited to 'drivers')

diff --git a/drivers/hid/bpf/entrypoints/entrypoints.bpf.c b/drivers/hid/bpf/entrypoints/entrypoints.bpf.c
index 7c1895d9e5c0..c22921125a1a 100644
--- a/drivers/hid/bpf/entrypoints/entrypoints.bpf.c
+++ b/drivers/hid/bpf/entrypoints/entrypoints.bpf.c
@@ -7,8 +7,6 @@
 
 #define HID_BPF_MAX_PROGS 1024
 
-extern void call_hid_bpf_prog_put_deferred(struct work_struct *work) __ksym;
-
 struct {
 	__uint(type, BPF_MAP_TYPE_PROG_ARRAY);
 	__uint(max_entries, HID_BPF_MAX_PROGS);
@@ -24,11 +22,4 @@ int BPF_PROG(hid_tail_call, struct hid_bpf_ctx *hctx)
 	return 0;
 }
 
-SEC("fentry/bpf_prog_put_deferred")
-int BPF_PROG(hid_bpf_prog_put_deferred, struct work_struct *work)
-{
-	call_hid_bpf_prog_put_deferred(work);
-	return 0;
-}
-
 char LICENSE[] SEC("license") = "GPL";
diff --git a/drivers/hid/bpf/entrypoints/entrypoints.lskel.h b/drivers/hid/bpf/entrypoints/entrypoints.lskel.h
index 9ffb991b3e6f..35618051598c 100644
--- a/drivers/hid/bpf/entrypoints/entrypoints.lskel.h
+++ b/drivers/hid/bpf/entrypoints/entrypoints.lskel.h
@@ -12,11 +12,9 @@ struct entrypoints_bpf {
 	} maps;
 	struct {
 		struct bpf_prog_desc hid_tail_call;
-		struct bpf_prog_desc hid_bpf_prog_put_deferred;
 	} progs;
 	struct {
 		int hid_tail_call_fd;
-		int hid_bpf_prog_put_deferred_fd;
 	} links;
 };
 
@@ -31,24 +29,12 @@ entrypoints_bpf__hid_tail_call__attach(struct entrypoints_bpf *skel)
 	return fd;
 }
 
-static inline int
-entrypoints_bpf__hid_bpf_prog_put_deferred__attach(struct entrypoints_bpf *skel)
-{
-	int prog_fd = skel->progs.hid_bpf_prog_put_deferred.prog_fd;
-	int fd = skel_raw_tracepoint_open(NULL, prog_fd);
-
-	if (fd > 0)
-		skel->links.hid_bpf_prog_put_deferred_fd = fd;
-	return fd;
-}
-
 static inline int
 entrypoints_bpf__attach(struct entrypoints_bpf *skel)
 {
 	int ret = 0;
 
 	ret = ret < 0 ? ret : entrypoints_bpf__hid_tail_call__attach(skel);
-	ret = ret < 0 ? ret : entrypoints_bpf__hid_bpf_prog_put_deferred__attach(skel);
 	return ret < 0 ? ret : 0;
 }
 
@@ -56,7 +42,6 @@ static inline void
 entrypoints_bpf__detach(struct entrypoints_bpf *skel)
 {
 	skel_closenz(skel->links.hid_tail_call_fd);
-	skel_closenz(skel->links.hid_bpf_prog_put_deferred_fd);
 }
 static void
 entrypoints_bpf__destroy(struct entrypoints_bpf *skel)
@@ -65,7 +50,6 @@ entrypoints_bpf__destroy(struct entrypoints_bpf *skel)
 		return;
 	entrypoints_bpf__detach(skel);
 	skel_closenz(skel->progs.hid_tail_call.prog_fd);
-	skel_closenz(skel->progs.hid_bpf_prog_put_deferred.prog_fd);
 	skel_closenz(skel->maps.hid_jmp_table.map_fd);
 	skel_free(skel);
 }
@@ -91,7 +75,7 @@ entrypoints_bpf__load(struct entrypoints_bpf *skel)
 	int err;
 
 	opts.ctx = (struct bpf_loader_ctx *)skel;
-	opts.data_sz = 3792;
+	opts.data_sz = 2856;
 	opts.data = (void *)"\
 \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
 \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
@@ -126,7 +110,7 @@ entrypoints_bpf__load(struct entrypoints_bpf *skel)
 \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
 \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
 \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x9f\xeb\x01\0\
-\x18\0\0\0\0\0\0\0\xa4\x03\0\0\xa4\x03\0\0\x54\x03\0\0\0\0\0\0\0\0\0\x02\x03\0\
+\x18\0\0\0\0\0\0\0\x60\x02\0\0\x60\x02\0\0\x12\x02\0\0\0\0\0\0\0\0\0\x02\x03\0\
 \0\0\x01\0\0\0\0\0\0\x01\x04\0\0\0\x20\0\0\x01\0\0\0\0\0\0\0\x03\0\0\0\0\x02\0\
 \0\0\x04\0\0\0\x03\0\0\0\x05\0\0\0\0\0\0\x01\x04\0\0\0\x20\0\0\0\0\0\0\0\0\0\0\
 \x02\x06\0\0\0\0\0\0\0\0\0\0\x03\0\0\0\0\x02\0\0\0\x04\0\0\0\0\x04\0\0\0\0\0\0\
@@ -139,25 +123,14 @@ entrypoints_bpf__load(struct entrypoints_bpf *skel)
 \0\0\0\0\0\0\0\x1b\x01\0\0\x12\0\0\0\x40\0\0\0\x1f\x01\0\0\x10\0\0\0\x80\0\0\0\
 \x2e\x01\0\0\x14\0\0\0\xa0\0\0\0\0\0\0\0\x15\0\0\0\xc0\0\0\0\x3a\x01\0\0\0\0\0\
 \x08\x11\0\0\0\x40\x01\0\0\0\0\0\x01\x04\0\0\0\x20\0\0\0\0\0\0\0\0\0\0\x02\x13\
-\0\0\0\0\0\0\0\0\0\0\x0a\x2d\0\0\0\x4d\x01\0\0\x04\0\0\x06\x04\0\0\0\x5d\x01\0\
+\0\0\0\0\0\0\0\0\0\0\x0a\x1c\0\0\0\x4d\x01\0\0\x04\0\0\x06\x04\0\0\0\x5d\x01\0\
 \0\0\0\0\0\x6e\x01\0\0\x01\0\0\0\x80\x01\0\0\x02\0\0\0\x93\x01\0\0\x03\0\0\0\0\
 \0\0\0\x02\0\0\x05\x04\0\0\0\xa4\x01\0\0\x16\0\0\0\0\0\0\0\xab\x01\0\0\x16\0\0\
-\0\0\0\0\0\xb0\x01\0\0\0\0\0\x08\x02\0\0\0\0\0\0\0\x01\0\0\x0d\x02\0\0\0\x5f\0\
-\0\0\x0b\0\0\0\xec\x01\0\0\x01\0\0\x0c\x17\0\0\0\0\0\0\0\x01\0\0\x0d\0\0\0\0\
-\x49\x03\0\0\x1a\0\0\0\0\0\0\0\0\0\0\x02\x1b\0\0\0\x8c\x02\0\0\x03\0\0\x04\x20\
-\0\0\0\x98\x02\0\0\x1c\0\0\0\0\0\0\0\x9d\x02\0\0\x22\0\0\0\x40\0\0\0\xa3\x02\0\
-\0\x24\0\0\0\xc0\0\0\0\xa8\x02\0\0\0\0\0\x08\x1d\0\0\0\xb6\x02\0\0\0\0\0\x08\
-\x1e\0\0\0\0\0\0\0\x01\0\0\x04\x08\0\0\0\xc1\x02\0\0\x1f\0\0\0\0\0\0\0\xc9\x02\
-\0\0\0\0\0\x08\x20\0\0\0\xcd\x02\0\0\0\0\0\x08\x21\0\0\0\xd3\x02\0\0\0\0\0\x01\
-\x08\0\0\0\x40\0\0\x01\xdd\x02\0\0\x02\0\0\x04\x10\0\0\0\xe7\x02\0\0\x23\0\0\0\
-\0\0\0\0\xec\x02\0\0\x23\0\0\0\x40\0\0\0\0\0\0\0\0\0\0\x02\x22\0\0\0\xf1\x02\0\
-\0\0\0\0\x08\x25\0\0\0\0\0\0\0\0\0\0\x02\x19\0\0\0\xfd\x02\0\0\x01\0\0\x0c\x19\
-\0\0\0\x1c\x03\0\0\0\0\0\x01\x01\0\0\0\x08\0\0\x01\0\0\0\0\0\0\0\x03\0\0\0\0\
-\x27\0\0\0\x04\0\0\0\x04\0\0\0\x21\x03\0\0\0\0\0\x0e\x28\0\0\0\x01\0\0\0\x29\
-\x03\0\0\x01\0\0\x0f\x04\0\0\0\x2e\0\0\0\0\0\0\0\x04\0\0\0\x30\x03\0\0\x01\0\0\
-\x0f\x20\0\0\0\x0a\0\0\0\0\0\0\0\x20\0\0\0\x36\x03\0\0\x01\0\0\x0f\x04\0\0\0\
-\x29\0\0\0\0\0\0\0\x04\0\0\0\x3e\x03\0\0\0\0\0\x07\0\0\0\0\x49\x03\0\0\0\0\0\
-\x0e\x02\0\0\0\x01\0\0\0\0\x69\x6e\x74\0\x5f\x5f\x41\x52\x52\x41\x59\x5f\x53\
+\0\0\0\0\0\xb0\x01\0\0\0\0\0\x08\x02\0\0\0\xec\x01\0\0\0\0\0\x01\x01\0\0\0\x08\
+\0\0\x01\0\0\0\0\0\0\0\x03\0\0\0\0\x17\0\0\0\x04\0\0\0\x04\0\0\0\xf1\x01\0\0\0\
+\0\0\x0e\x18\0\0\0\x01\0\0\0\xf9\x01\0\0\x01\0\0\x0f\x20\0\0\0\x0a\0\0\0\0\0\0\
+\0\x20\0\0\0\xff\x01\0\0\x01\0\0\x0f\x04\0\0\0\x19\0\0\0\0\0\0\0\x04\0\0\0\x07\
+\x02\0\0\0\0\0\x07\0\0\0\0\0\x69\x6e\x74\0\x5f\x5f\x41\x52\x52\x41\x59\x5f\x53\
 \x49\x5a\x45\x5f\x54\x59\x50\x45\x5f\x5f\0\x74\x79\x70\x65\0\x6d\x61\x78\x5f\
 \x65\x6e\x74\x72\x69\x65\x73\0\x6b\x65\x79\x5f\x73\x69\x7a\x65\0\x76\x61\x6c\
 \x75\x65\x5f\x73\x69\x7a\x65\0\x68\x69\x64\x5f\x6a\x6d\x70\x5f\x74\x61\x62\x6c\
@@ -182,119 +155,64 @@ entrypoints_bpf__load(struct entrypoints_bpf *skel)
 \x5f\x5f\x73\x33\x32\0\x30\x3a\x30\0\x09\x62\x70\x66\x5f\x74\x61\x69\x6c\x5f\
 \x63\x61\x6c\x6c\x28\x63\x74\x78\x2c\x20\x26\x68\x69\x64\x5f\x6a\x6d\x70\x5f\
 \x74\x61\x62\x6c\x65\x2c\x20\x68\x63\x74\x78\x2d\x3e\x69\x6e\x64\x65\x78\x29\
-\x3b\0\x68\x69\x64\x5f\x62\x70\x66\x5f\x70\x72\x6f\x67\x5f\x70\x75\x74\x5f\x64\
-\x65\x66\x65\x72\x72\x65\x64\0\x66\x65\x6e\x74\x72\x79\x2f\x62\x70\x66\x5f\x70\
-\x72\x6f\x67\x5f\x70\x75\x74\x5f\x64\x65\x66\x65\x72\x72\x65\x64\0\x69\x6e\x74\
-\x20\x42\x50\x46\x5f\x50\x52\x4f\x47\x28\x68\x69\x64\x5f\x62\x70\x66\x5f\x70\
-\x72\x6f\x67\x5f\x70\x75\x74\x5f\x64\x65\x66\x65\x72\x72\x65\x64\x2c\x20\x73\
-\x74\x72\x75\x63\x74\x20\x77\x6f\x72\x6b\x5f\x73\x74\x72\x75\x63\x74\x20\x2a\
-\x77\x6f\x72\x6b\x29\0\x09\x63\x61\x6c\x6c\x5f\x68\x69\x64\x5f\x62\x70\x66\x5f\
-\x70\x72\x6f\x67\x5f\x70\x75\x74\x5f\x64\x65\x66\x65\x72\x72\x65\x64\x28\x77\
-\x6f\x72\x6b\x29\x3b\0\x77\x6f\x72\x6b\x5f\x73\x74\x72\x75\x63\x74\0\x64\x61\
-\x74\x61\0\x65\x6e\x74\x72\x79\0\x66\x75\x6e\x63\0\x61\x74\x6f\x6d\x69\x63\x5f\
-\x6c\x6f\x6e\x67\x5f\x74\0\x61\x74\x6f\x6d\x69\x63\x36\x34\x5f\x74\0\x63\x6f\
-\x75\x6e\x74\x65\x72\0\x73\x36\x34\0\x5f\x5f\x73\x36\x34\0\x6c\x6f\x6e\x67\x20\
-\x6c\x6f\x6e\x67\0\x6c\x69\x73\x74\x5f\x68\x65\x61\x64\0\x6e\x65\x78\x74\0\x70\
-\x72\x65\x76\0\x77\x6f\x72\x6b\x5f\x66\x75\x6e\x63\x5f\x74\0\x63\x61\x6c\x6c\
-\x5f\x68\x69\x64\x5f\x62\x70\x66\x5f\x70\x72\x6f\x67\x5f\x70\x75\x74\x5f\x64\
-\x65\x66\x65\x72\x72\x65\x64\0\x63\x68\x61\x72\0\x4c\x49\x43\x45\x4e\x53\x45\0\
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-\x68\x69\x64\x5f\x64\x65\x76\x69\x63\x65\0\x64\x75\x6d\x6d\x79\x5f\x6b\x73\x79\
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-	opts.insns_sz = 2056;
+\0\0";
+	opts.insns_sz = 1192;
 	opts.insns = (void *)"\
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+\0\0\xbc\x09\0\0\x63\x01\0\0\0\0\0\0\xb7\x01\0\0\0\0\0\0\x18\x62\0\0\0\0\0\0\0\
+\0\0\0\xb0\x09\0\0\xb7\x03\0\0\x48\0\0\0\x85\0\0\0\xa6\0\0\0\xbf\x07\0\0\0\0\0\
+\0\xc5\x07\xca\xff\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x63\x71\0\0\0\0\
+\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\xf8\x09\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x90\
+\x0a\0\0\x7b\x01\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\0\x0a\0\0\x18\x61\0\0\
+\0\0\0\0\0\0\0\0\x88\x0a\0\0\x7b\x01\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\
+\x38\x0a\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\xd0\x0a\0\0\x7b\x01\0\0\0\0\0\0\x18\
+\x60\0\0\0\0\0\0\0\0\0\0\x40\x0a\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\xe0\x0a\0\0\
+\x7b\x01\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\x70\x0a\0\0\x18\x61\0\0\0\0\0\
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+\x18\x61\0\0\0\0\0\0\0\0\0\0\xf8\x0a\0\0\x7b\x01\0\0\0\0\0\0\x61\x60\x08\0\0\0\
+\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x98\x0a\0\0\x63\x01\0\0\0\0\0\0\x61\x60\x0c\0\
+\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x9c\x0a\0\0\x63\x01\0\0\0\0\0\0\x79\x60\
+\x10\0\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\xa0\x0a\0\0\x7b\x01\0\0\0\0\0\0\x61\
+\xa0\x78\xff\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\xc8\x0a\0\0\x63\x01\0\0\0\0\0\
+\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x10\x0b\0\0\xb7\x02\0\0\x14\0\0\0\xb7\x03\0\0\
+\x0c\0\0\0\xb7\x04\0\0\0\0\0\0\x85\0\0\0\xa7\0\0\0\xbf\x07\0\0\0\0\0\0\xc5\x07\
+\x91\xff\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\x80\x0a\0\0\x63\x70\x6c\0\0\0\0\0\
+\x77\x07\0\0\x20\0\0\0\x63\x70\x70\0\0\0\0\0\xb7\x01\0\0\x05\0\0\0\x18\x62\0\0\
+\0\0\0\0\0\0\0\0\x80\x0a\0\0\xb7\x03\0\0\x8c\0\0\0\x85\0\0\0\xa6\0\0\0\xbf\x07\
+\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\xf0\x0a\0\0\x61\x01\0\0\0\0\0\0\xd5\
+\x01\x02\0\0\0\0\0\xbf\x19\0\0\0\0\0\0\x85\0\0\0\xa8\0\0\0\xc5\x07\x7f\xff\0\0\
+\0\0\x63\x7a\x80\xff\0\0\0\0\x61\xa1\x78\xff\0\0\0\0\xd5\x01\x02\0\0\0\0\0\xbf\
+\x19\0\0\0\0\0\0\x85\0\0\0\xa8\0\0\0\x61\xa0\x80\xff\0\0\0\0\x63\x06\x28\0\0\0\
+\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x61\x10\0\0\0\0\0\0\x63\x06\x18\0\0\0\
+\0\0\xb7\0\0\0\0\0\0\0\x95\0\0\0\0\0\0\0";
 	err = bpf_load_and_run(&opts);
 	if (err < 0)
 		return err;
diff --git a/drivers/hid/bpf/hid_bpf_dispatch.c b/drivers/hid/bpf/hid_bpf_dispatch.c
index 8d29fd361ab9..26117b4ec016 100644
--- a/drivers/hid/bpf/hid_bpf_dispatch.c
+++ b/drivers/hid/bpf/hid_bpf_dispatch.c
@@ -173,7 +173,6 @@ hid_bpf_get_data(struct hid_bpf_ctx *ctx, unsigned int offset, const size_t rdwr
  * can use.
  */
 BTF_SET8_START(hid_bpf_kfunc_ids)
-BTF_ID_FLAGS(func, call_hid_bpf_prog_put_deferred)
 BTF_ID_FLAGS(func, hid_bpf_get_data, KF_RET_NULL)
 BTF_SET8_END(hid_bpf_kfunc_ids)
 
diff --git a/drivers/hid/bpf/hid_bpf_dispatch.h b/drivers/hid/bpf/hid_bpf_dispatch.h
index 2eeab1f746dd..63dfc8605cd2 100644
--- a/drivers/hid/bpf/hid_bpf_dispatch.h
+++ b/drivers/hid/bpf/hid_bpf_dispatch.h
@@ -22,7 +22,4 @@ int hid_bpf_reconnect(struct hid_device *hdev);
 
 struct bpf_prog;
 
-/* HID-BPF internal kfuncs API */
-void call_hid_bpf_prog_put_deferred(struct work_struct *work);
-
 #endif
diff --git a/drivers/hid/bpf/hid_bpf_jmp_table.c b/drivers/hid/bpf/hid_bpf_jmp_table.c
index b7eb5c5e435f..eca34b7372f9 100644
--- a/drivers/hid/bpf/hid_bpf_jmp_table.c
+++ b/drivers/hid/bpf/hid_bpf_jmp_table.c
@@ -499,11 +499,6 @@ void __hid_bpf_destroy_device(struct hid_device *hdev)
 	schedule_work(&release_work);
 }
 
-void call_hid_bpf_prog_put_deferred(struct work_struct *work)
-{
-	/* kept around for patch readability, to be dropped in the next commmit */
-}
-
 #define HID_BPF_PROGS_COUNT 1
 
 static struct bpf_link *links[HID_BPF_PROGS_COUNT];
-- 
cgit v1.2.3


From 0c2d572828a68e8416619e0832d4d55317cb3c57 Mon Sep 17 00:00:00 2001
From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Date: Fri, 13 Jan 2023 10:09:35 +0100
Subject: HID: bpf: reorder BPF registration

Given that our initial BPF program is not using any kfuncs anymore,
we can reorder the initialization to first try to load it and then
register the kfuncs. This has the advantage of not exporting kfuncs
when HID-BPF is not working.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
 drivers/hid/bpf/hid_bpf_dispatch.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

(limited to 'drivers')

diff --git a/drivers/hid/bpf/hid_bpf_dispatch.c b/drivers/hid/bpf/hid_bpf_dispatch.c
index 26117b4ec016..8a034a555d4c 100644
--- a/drivers/hid/bpf/hid_bpf_dispatch.c
+++ b/drivers/hid/bpf/hid_bpf_dispatch.c
@@ -514,15 +514,16 @@ static int __init hid_bpf_init(void)
 		return 0;
 	}
 
-	err = register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING, &hid_bpf_kfunc_set);
+	err = hid_bpf_preload_skel();
 	if (err) {
-		pr_warn("error while setting HID BPF tracing kfuncs: %d", err);
+		pr_warn("error while preloading HID BPF dispatcher: %d", err);
 		return 0;
 	}
 
-	err = hid_bpf_preload_skel();
+	/* register tracing kfuncs after we are sure we can load our preloaded bpf program */
+	err = register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING, &hid_bpf_kfunc_set);
 	if (err) {
-		pr_warn("error while preloading HID BPF dispatcher: %d", err);
+		pr_warn("error while setting HID BPF tracing kfuncs: %d", err);
 		return 0;
 	}
 
-- 
cgit v1.2.3