linux-toradex.git/tools/bpf/bpftool/Makefile, branch master

bpftool: Fix dependencies for static build

2026-01-28T21:26:41+00:00

When building selftests/bpf with EXTRA_LDFLAGS=-static the follwoing
error happens:

  LINK    /ws/linux/tools/testing/selftests/bpf/tools/build/bpftool/bootstrap/bpftool
/usr/bin/x86_64-linux-gnu-ld.bfd: /usr/lib/gcc/x86_64-linux-gnu/15/../../../x86_64-linux-gnu/libcrypto.a(libcrypto-lib-dso_dlfcn.o): in function `dlfcn_globallookup':
   [...]
/usr/bin/x86_64-linux-gnu-ld.bfd: /usr/lib/gcc/x86_64-linux-gnu/15/../../../x86_64-linux-gnu/libcrypto.a(libcrypto-lib-c_zlib.o): in function `zlib_oneshot_expand_block':
(.text+0xc64): undefined reference to `uncompress'
/usr/bin/x86_64-linux-gnu-ld.bfd: /usr/lib/gcc/x86_64-linux-gnu/15/../../../x86_64-linux-gnu/libcrypto.a(libcrypto-lib-c_zlib.o): in function `zlib_oneshot_compress_block':
(.text+0xce4): undefined reference to `compress'
collect2: error: ld returned 1 exit status
make[1]: *** [Makefile:252: /ws/linux/tools/testing/selftests/bpf/tools/build/bpftool/bootstrap/bpftool] Error 1
make: *** [Makefile:327: /ws/linux/tools/testing/selftests/bpf/tools/sbin/bpftool] Error 2
make: *** Waiting for unfinished jobs....

This is caused by wrong order of dependencies in the Makefile. Fix it.

Signed-off-by: Ihor Solodrai 
Signed-off-by: Andrii Nakryiko 
Link: https://lore.kernel.org/bpf/20260128211255.376933-1-ihor.solodrai@linux.dev

bpftool: Fix build warnings due to MS extensions

2025-12-10T07:21:33+00:00

The kernel is now built with -fms-extensions. Anonymous structs or
unions permitted by these extensions have been used in several places,
and can end up in the generated vmlinux.h file, for example:

    struct ns_tree {
        [...]
    };

    [...]

    struct ns_common {
            [...]
            union {
                    struct ns_tree;
                    struct callback_head ns_rcu;
            };
    };

Trying to include this header for compiling a tool may result in build
warnings, if the compiler does not expect these extensions. This is the
case, for example, with bpftool:

    In file included from skeleton/pid_iter.bpf.c:3:
    .../tools/testing/selftests/bpf/tools/build/bpftool/vmlinux.h:64057:3:
    warning: declaration does not declare anything
    [-Wmissing-declarations]
     64057 |                 struct ns_tree;
           |                 ^~~~~~~~~~~~~~

Fix these build warnings in bpftool by turning on Microsoft extensions
when compiling the two BPF programs that rely on vmlinux.h.

Reported-by: Alexei Starovoitov 
Closes: https://lore.kernel.org/bpf/CAADnVQK9ZkPC7+R5VXKHVdtj8tumpMXm7BTp0u9CoiFLz_aPTg@mail.gmail.com/
Signed-off-by: Quentin Monnet 
Link: https://lore.kernel.org/r/20251208130748.68371-1-qmo@kernel.org
Signed-off-by: Alexei Starovoitov

bpftool: Add support for signing BPF programs

2025-09-23T02:17:55+00:00

Two modes of operation being added:

Add two modes of operation:

* For prog load, allow signing a program immediately before loading. This
  is essential for command-line testing and administration.

      bpftool prog load -S -k  -i  fentry_test.bpf.o

* For gen skeleton, embed a pre-generated signature into the C skeleton
  file. This supports the use of signed programs in compiled applications.

      bpftool gen skeleton -S -k  -i  fentry_test.bpf.o

Generation of the loader program and its metadata map is implemented in
libbpf (bpf_obj__gen_loader). bpftool generates a skeleton that loads
the program and automates the required steps: freezing the map, creating
an exclusive map, loading, and running. Users can use standard libbpf
APIs directly or integrate loader program generation into their own
toolchains.

Signed-off-by: KP Singh 
Acked-by: Quentin Monnet 
Link: https://lore.kernel.org/r/20250921160120.9711-5-kpsingh@kernel.org
Signed-off-by: Alexei Starovoitov

Merge tag 'bpf-next-6.15' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next

2025-03-30T19:43:03+00:00

Pull bpf updates from Alexei Starovoitov:
 "For this merge window we're splitting BPF pull request into three for
  higher visibility: main changes, res_spin_lock, try_alloc_pages.

  These are the main BPF changes:

   - Add DFA-based live registers analysis to improve verification of
     programs with loops (Eduard Zingerman)

   - Introduce load_acquire and store_release BPF instructions and add
     x86, arm64 JIT support (Peilin Ye)

   - Fix loop detection logic in the verifier (Eduard Zingerman)

   - Drop unnecesary lock in bpf_map_inc_not_zero() (Eric Dumazet)

   - Add kfunc for populating cpumask bits (Emil Tsalapatis)

   - Convert various shell based tests to selftests/bpf/test_progs
     format (Bastien Curutchet)

   - Allow passing referenced kptrs into struct_ops callbacks (Amery
     Hung)

   - Add a flag to LSM bpf hook to facilitate bpf program signing
     (Blaise Boscaccy)

   - Track arena arguments in kfuncs (Ihor Solodrai)

   - Add copy_remote_vm_str() helper for reading strings from remote VM
     and bpf_copy_from_user_task_str() kfunc (Jordan Rome)

   - Add support for timed may_goto instruction (Kumar Kartikeya
     Dwivedi)

   - Allow bpf_get_netns_cookie() int cgroup_skb programs (Mahe Tardy)

   - Reduce bpf_cgrp_storage_busy false positives when accessing cgroup
     local storage (Martin KaFai Lau)

   - Introduce bpf_dynptr_copy() kfunc (Mykyta Yatsenko)

   - Allow retrieving BTF data with BTF token (Mykyta Yatsenko)

   - Add BPF kfuncs to set and get xattrs with 'security.bpf.' prefix
     (Song Liu)

   - Reject attaching programs to noreturn functions (Yafang Shao)

   - Introduce pre-order traversal of cgroup bpf programs (Yonghong
     Song)"

* tag 'bpf-next-6.15' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next: (186 commits)
  selftests/bpf: Add selftests for load-acquire/store-release when register number is invalid
  bpf: Fix out-of-bounds read in check_atomic_load/store()
  libbpf: Add namespace for errstr making it libbpf_errstr
  bpf: Add struct_ops context information to struct bpf_prog_aux
  selftests/bpf: Sanitize pointer prior fclose()
  selftests/bpf: Migrate test_xdp_vlan.sh into test_progs
  selftests/bpf: test_xdp_vlan: Rename BPF sections
  bpf: clarify a misleading verifier error message
  selftests/bpf: Add selftest for attaching fexit to __noreturn functions
  bpf: Reject attaching fexit/fmod_ret to __noreturn functions
  bpf: Only fails the busy counter check in bpf_cgrp_storage_get if it creates storage
  bpf: Make perf_event_read_output accessible in all program types.
  bpftool: Using the right format specifiers
  bpftool: Add -Wformat-signedness flag to detect format errors
  selftests/bpf: Test freplace from user namespace
  libbpf: Pass BPF token from find_prog_btf_id to BPF_BTF_GET_FD_BY_ID
  bpf: Return prog btf_id without capable check
  bpf: BPF token support for BPF_BTF_GET_FD_BY_ID
  bpf, x86: Fix objtool warning for timed may_goto
  bpf: Check map->record at the beginning of check_and_free_fields()
  ...

bpftool: Add -Wformat-signedness flag to detect format errors

2025-03-17T20:50:56+00:00

This commit adds the -Wformat-signedness compiler flag to detect and
prevent printf format errors, where signed or unsigned types are
mismatched with format specifiers. This helps to catch potential issues at
compile-time, ensuring that our code is more robust and reliable. With
this flag, the compiler will now warn about incorrect format strings, such
as using %d with unsigned types or %u with signed types.

Signed-off-by: Jiayuan Chen 
Signed-off-by: Andrii Nakryiko 
Link: https://lore.kernel.org/bpf/20250311112809.81901-2-jiayuan.chen@linux.dev

tools: Remove redundant quiet setup

2025-02-18T19:27:43+00:00

Q is exported from Makefile.include so it is not necessary to manually
set it.

Reviewed-by: Jiri Olsa 
Signed-off-by: Charlie Jenkins 
Acked-by: Andrii Nakryiko 
Acked-by: Quentin Monnet 
Cc: Adrian Hunter 
Cc: Alexander Shishkin 
Cc: Alexei Starovoitov 
Cc: Benjamin Tissoires 
Cc: Daniel Borkmann 
Cc: Daniel Lezcano 
Cc: Eduard Zingerman 
Cc: Hao Luo 
Cc: Ian Rogers 
Cc: Ingo Molnar 
Cc: Jiri Kosina 
Cc: John Fastabend 
Cc: Josh Poimboeuf 
Cc: KP Singh 
Cc: Lukasz Luba 
Cc: Mark Rutland 
Cc: Martin KaFai Lau 
Cc: Mykola Lysenko 
Cc: Namhyung Kim 
Cc: Peter Zijlstra 
Cc: Rafael J. Wysocki 
Cc: Shuah Khan 
Cc: Song Liu 
Cc: Stanislav Fomichev 
Cc: Steven Rostedt (VMware) 
Cc: Yonghong Song 
Cc: Zhang Rui 
Link: https://lore.kernel.org/r/20250213-quiet_tools-v3-2-07de4482a581@rivosinc.com
Signed-off-by: Arnaldo Carvalho de Melo

bpftool: Link zstd lib required by libelf

2024-12-18T19:24:32+00:00

When the feature libelf-zstd is detected, the zstd lib is required by
libelf.  Link the zstd lib in this case.

Reviewed-by: Quentin Monnet 
Signed-off-by: Leo Yan 
Tested-by: Namhyung Kim 
Acked-by: Andrii Nakryiko 
Cc: Adrian Hunter 
Cc: Alexei Starovoitov 
Cc: Daniel Borkmann 
Cc: Eduard Zingerman 
Cc: Guilherme Amadio 
Cc: Hao Luo 
Cc: Ian Rogers 
Cc: James Clark 
Cc: Jiri Olsa 
Cc: John Fastabend 
Cc: KP Singh 
Cc: Kan Liang 
Cc: Martin KaFai Lau 
Cc: Nick Terrell 
Cc: Song Liu 
Cc: Stanislav Fomichev 
Cc: Yonghong Song 
Link: https://lore.kernel.org/r/20241215221223.293205-4-leo.yan@arm.com
Signed-off-by: Arnaldo Carvalho de Melo

bpftool: Prevent setting duplicate _GNU_SOURCE in Makefile

2024-11-01T19:37:01+00:00

When building selftests with CFLAGS set via env variable, the value of
CFLAGS is propagated into bpftool Makefile (called from selftests
Makefile). This makes the compilation fail as _GNU_SOURCE is defined two
times - once from selftests Makefile (by including lib.mk) and once from
bpftool Makefile (by calling `llvm-config --cflags`):

    $ CFLAGS="" make -C tools/testing/selftests/bpf
    [...]
    CC      /bpf-next/tools/testing/selftests/bpf/tools/build/bpftool/btf.o
    : error: "_GNU_SOURCE" redefined [-Werror]
    : note: this is the location of the previous definition
    cc1: all warnings being treated as errors
    [...]

Filter out -D_GNU_SOURCE from the result of `llvm-config --cflags` in
bpftool Makefile to prevent this error.

Signed-off-by: Viktor Malik 
Signed-off-by: Andrii Nakryiko 
Acked-by: Quentin Monnet 
Acked-by: Jiri Olsa 
Link: https://lore.kernel.org/bpf/acec3108b62d4df1436cda777e58e93e033ac7a7.1730449390.git.vmalik@redhat.com

bpftool: Fix make dependencies for vmlinux.h

2024-05-18T17:46:16+00:00

With pre-generated vmlinux.h there is no dependency on neither vmlinux
nor bootstrap bpftool. Define dependencies separately for both modes.
This avoids needless rebuilds in some corner cases.

Suggested-by: Jan Stancek 
Signed-off-by: Artem Savkov 
Signed-off-by: Andrii Nakryiko 
Acked-by: Quentin Monnet 
Link: https://lore.kernel.org/bpf/20240513112658.43691-1-asavkov@redhat.com
Signed-off-by: Alexei Starovoitov

bpftool, selftests/hid/bpf: Fix 29 clang warnings

2024-05-06T21:39:36+00:00

When building either tools/bpf/bpftool, or tools/testing/selftests/hid,
(the same Makefile is used for these), clang generates many instances of
the following:

    "clang: warning: -lLLVM-17: 'linker' input unused"

Quentin points out that the LLVM version is only required in $(LIBS),
not in $(CFLAGS), so the fix is to remove it from CFLAGS.

Suggested-by: Quentin Monnet 
Signed-off-by: John Hubbard 
Signed-off-by: Andrii Nakryiko 
Acked-by: Quentin Monnet 
Link: https://lore.kernel.org/bpf/20240505230054.13813-1-jhubbard@nvidia.com