From 784cdf931543805120aed1e1c43df8e6fa436a55 Mon Sep 17 00:00:00 2001 From: Mykyta Yatsenko Date: Sun, 26 Oct 2025 20:38:53 +0000 Subject: selftests/bpf: add file dynptr tests Introducing selftests for validating file-backed dynptr works as expected. * validate implementation supports dynptr slice and read operations * validate destructors should be paired with initializers * validate sleepable progs can page in. Signed-off-by: Mykyta Yatsenko Reviewed-by: Eduard Zingerman Link: https://lore.kernel.org/r/20251026203853.135105-11-mykyta.yatsenko5@gmail.com Signed-off-by: Alexei Starovoitov --- .../testing/selftests/bpf/progs/file_reader_fail.c | 52 ++++++++++++++++++++++ 1 file changed, 52 insertions(+) create mode 100644 tools/testing/selftests/bpf/progs/file_reader_fail.c (limited to 'tools/testing/selftests/bpf/progs/file_reader_fail.c') diff --git a/tools/testing/selftests/bpf/progs/file_reader_fail.c b/tools/testing/selftests/bpf/progs/file_reader_fail.c new file mode 100644 index 000000000000..32fe28ed2439 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/file_reader_fail.c @@ -0,0 +1,52 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2025 Meta Platforms, Inc. and affiliates. */ + +#include +#include +#include +#include +#include "bpf_misc.h" + +char _license[] SEC("license") = "GPL"; + +int err; +void *user_ptr; + +SEC("lsm/file_open") +__failure +__msg("Unreleased reference id=") +int on_nanosleep_unreleased_ref(void *ctx) +{ + struct task_struct *task = bpf_get_current_task_btf(); + struct file *file = bpf_get_task_exe_file(task); + struct bpf_dynptr dynptr; + + if (!file) + return 0; + + err = bpf_dynptr_from_file(file, 0, &dynptr); + return err ? 1 : 0; +} + +SEC("xdp") +__failure +__msg("Expected a dynptr of type file as arg #0") +int xdp_wrong_dynptr_type(struct xdp_md *xdp) +{ + struct bpf_dynptr dynptr; + + bpf_dynptr_from_xdp(xdp, 0, &dynptr); + bpf_dynptr_file_discard(&dynptr); + return 0; +} + +SEC("xdp") +__failure +__msg("Expected an initialized dynptr as arg #0") +int xdp_no_dynptr_type(struct xdp_md *xdp) +{ + struct bpf_dynptr dynptr; + + bpf_dynptr_file_discard(&dynptr); + return 0; +} -- cgit v1.2.3