linux-stable.git/tools/lib/bpf, branch v6.18

bpf: add _impl suffix for bpf_stream_vprintk() kfunc

2025-11-05T01:50:25+00:00

Rename bpf_stream_vprintk() to bpf_stream_vprintk_impl().

This makes bpf_stream_vprintk() follow the already established "_impl"
suffix-based naming convention for kfuncs with the bpf_prog_aux
argument provided by the verifier implicitly. This convention will be
taken advantage of with the upcoming KF_IMPLICIT_ARGS feature to
preserve backwards compatibility to BPF programs.

Acked-by: Andrii Nakryiko 
Signed-off-by: Mykyta Yatsenko 
Link: https://lore.kernel.org/r/20251104-implv2-v3-2-4772b9ae0e06@meta.com
Signed-off-by: Alexei Starovoitov 
Acked-by: Ihor Solodrai

libbpf: Fix powerpc's stack register definition in bpf_tracing.h

2025-10-23T18:25:16+00:00

retsnoop's build on powerpc (ppc64le) architecture ([0]) failed due to
wrong definition of PT_REGS_SP() macro. Looking at powerpc's
implementation of stack unwinding in perf_callchain_user_64() clearly
shows that stack pointer register is gpr[1].

Fix libbpf's definition of __PT_SP_REG for powerpc to fix all this.

  [0] https://kojipkgs.fedoraproject.org/work/tasks/1544/137921544/build.log

Fixes: 138d6153a139 ("samples/bpf: Enable powerpc support")
Signed-off-by: Andrii Nakryiko 
Reviewed-by: Naveen N Rao (AMD) 
Link: https://lore.kernel.org/r/20251020203643.989467-1-andrii@kernel.org
Signed-off-by: Alexei Starovoitov

libbpf: Fix undefined behavior in {get,put}_unaligned_be32()

2025-10-06T16:16:29+00:00

These violate aliasing rules and may be miscompiled unless
-fno-strict-aliasing is used.  Replace them with the standard memcpy()
solution.  Note that compilers know how to optimize this properly.

Fixes: 4a1c9e544b8d ("libbpf: remove linux/unaligned.h dependency for libbpf_sha256()")
Signed-off-by: Eric Biggers 
Signed-off-by: Andrii Nakryiko 
Acked-by: Yonghong Song 
Link: https://lore.kernel.org/bpf/20251006012037.159295-1-ebiggers@kernel.org

libbpf: Fix missing #pragma in libbpf_utils.c

2025-10-02T21:33:57+00:00

The recent sha256 patch uses a GCC pragma to suppress compile errors for
a packed struct, but omits a needed pragma (see related link) and thus
still raises errors: (e.g. on GCC 12.3 armhf)

libbpf_utils.c:153:29: error: packed attribute causes inefficient alignment for ‘__val’ [-Werror=attributes]
  153 | struct __packed_u32 { __u32 __val; } __attribute__((packed));
      |                             ^~~~~

Resolve by adding the GCC diagnostic pragma to ignore "-Wattributes".

Link: https://lore.kernel.org/bpf/CAP-5=fXURWoZu2j6Y8xQy23i7=DfgThq3WC1RkGFBx-4moQKYQ@mail.gmail.com/

Fixes: 4a1c9e544b8d ("libbpf: remove linux/unaligned.h dependency for libbpf_sha256()")
Signed-off-by: Tony Ambardar 
Acked-by: Andrii Nakryiko 
Signed-off-by: Alexei Starovoitov

libbpf: remove linux/unaligned.h dependency for libbpf_sha256()

2025-10-01T22:27:25+00:00

linux/unaligned.h include dependency is causing issues for libbpf's
Github mirror due to {get,put}_unaligned_be32() usage.

So get rid of it by implementing custom variants of those macros that
will work both in kernel and Github mirror repos.

Also switch round_up() to roundup(), as the former is not available in
Github mirror (and is just a subtly more specific variant of roundup()
anyways).

Signed-off-by: Andrii Nakryiko 
Link: https://lore.kernel.org/r/20251001171326.3883055-6-andrii@kernel.org
Signed-off-by: Alexei Starovoitov 
Acked-by: Eduard Zingerman

libbpf: move libbpf_sha256() implementation into libbpf_utils.c

2025-10-01T22:27:25+00:00

Move sha256 implementation out of already large and unwieldy libbpf.c
into libbpf_utils.c where we'll keep reusable helpers.

Signed-off-by: Andrii Nakryiko 
Link: https://lore.kernel.org/r/20251001171326.3883055-5-andrii@kernel.org
Signed-off-by: Alexei Starovoitov 
Acked-by: Eduard Zingerman

libbpf: move libbpf_errstr() into libbpf_utils.c

2025-10-01T22:27:25+00:00

Get rid of str_err.{c,h} by moving implementation of libbpf_errstr()
into libbpf_utils.c and declarations into libbpf_internal.h.

Signed-off-by: Andrii Nakryiko 
Link: https://lore.kernel.org/r/20251001171326.3883055-4-andrii@kernel.org
Signed-off-by: Alexei Starovoitov 
Acked-by: Eduard Zingerman

libbpf: remove unused libbpf_strerror_r and STRERR_BUFSIZE

2025-10-01T22:27:25+00:00

libbpf_strerror_r() is not exposed as public API and neither is it used
inside libbpf itself. Remove it altogether.

Same for STRERR_BUFSIZE, it's just an orphaned leftover constant which
we missed to clean up some time earlier.

Signed-off-by: Andrii Nakryiko 
Link: https://lore.kernel.org/r/20251001171326.3883055-3-andrii@kernel.org
Signed-off-by: Alexei Starovoitov 
Acked-by: Eduard Zingerman

libbpf: make libbpf_errno.c into more generic libbpf_utils.c

2025-10-01T22:27:24+00:00

Libbpf is missing one convenient place to put common "utils"-like code
that is generic and usable from multiple places. Use libbpf_errno.c as
the base for more generic libbpf_utils.c.

Signed-off-by: Andrii Nakryiko 
Link: https://lore.kernel.org/r/20251001171326.3883055-2-andrii@kernel.org
Signed-off-by: Alexei Starovoitov 
Acked-by: Eduard Zingerman

libbpf: Replace AF_ALG with open coded SHA-256

2025-09-28T11:25:31+00:00

Reimplement libbpf_sha256() using some basic SHA-256 C code.  This
eliminates the newly-added dependency on AF_ALG, which is a problematic
UAPI that is not supported by all kernels.

Make libbpf_sha256() return void, since it can no longer fail.  This
simplifies some callers.  Also drop the unnecessary 'sha_out_sz'
parameter.  Finally, also fix the typo in "compute_sha_udpate_offsets".

Fixes: c297fe3e9f99 ("libbpf: Implement SHA256 internal helper")
Signed-off-by: Eric Biggers 
Link: https://lore.kernel.org/r/20250928003833.138407-1-ebiggers@kernel.org
Signed-off-by: Alexei Starovoitov