linux-stable.git/tools/lib/bpf, branch v7.2.6

libbpf: Search /lib64 and /lib in resolve_full_path()

2026-09-14T11:39:41+00:00

[ Upstream commit 7b5ae0481efdac040cea72b4fabd1398109f975b ]

attach_probe/uprobe-lib and uprobe_autoattach selftests fail with "failed
to resolve full path for libc.so.6" on older non-usrmerged distros, where
libc.so.6 lives under a top-level /lib64 or /lib rather than /usr/lib64 or
/usr/lib. Add /lib64:/lib to the search paths, alongside the existing
/usr/lib64:/usr/lib and Debian multiarch entries.

Fixes: 1ce3a60e3c28 ("libbpf: auto-resolve programs/libraries when necessary for uprobes")
Signed-off-by: Ricardo B. Marlière 
Acked-by: Ihor Solodrai 
Link: https://lore.kernel.org/bpf/20260720-selftests-bpf_fixes-v2-3-b450eda93dfe@suse.com
Signed-off-by: Kumar Kartikeya Dwivedi 
Signed-off-by: Sasha Levin

libbpf: Detect uprobe syscall with new error

2026-09-14T11:39:13+00:00

[ Upstream commit 8cae54c586084c81ab80f6ab020192eb2ce7aa0b ]

In the previous optimized uprobe fix we changed the syscall
error used for its detection from ENXIO to EPROTO.

Changing related probe_uprobe_syscall detection check.

Fixes: 05738da0efa1 ("libbpf: Add uprobe syscall feature detection")
Fixes: 554ba38456da ("uprobes/x86: Move optimized uprobe from nop5 to nop10")
Signed-off-by: Jiri Olsa 
Signed-off-by: Peter Zijlstra (Intel) 
Signed-off-by: Ingo Molnar 
Acked-by: Andrii Nakryiko 
Link: https://patch.msgid.link/20260703114917.238144-8-jolsa@kernel.org
Signed-off-by: Sasha Levin

libbpf: Change has_nop_combo to work on top of nop10

2026-09-14T11:39:13+00:00

[ Upstream commit ee2862439e5c8763cee84e910706fdc5b97bc879 ]

We now expect nop combo with 10 bytes nop instead of 5 bytes nop,
fixing has_nop_combo to reflect that.

Fixes: 41a5c7df4466 ("libbpf: Add support to detect nop,nop5 instructions combo for usdt probe")
Fixes: 554ba38456da ("uprobes/x86: Move optimized uprobe from nop5 to nop10")
Signed-off-by: Jiri Olsa 
Signed-off-by: Peter Zijlstra (Intel) 
Signed-off-by: Ingo Molnar 
Reviewed-by: Jakub Sitnicki 
Acked-by: Andrii Nakryiko 
Link: https://patch.msgid.link/20260703114917.238144-7-jolsa@kernel.org
Signed-off-by: Sasha Levin

libbpf: Initialize CFLAGS before including Makefile.include

2026-06-15T00:32:53+00:00

tools/scripts/Makefile.include may expand EXTRA_CFLAGS in a future
change.  This could alter the initialization of CFLAGS, as the default
options "-g -O2" would never be set once EXTRA_CFLAGS is expanded.

Prepare for this by moving the CFLAGS initialization before including
tools/scripts/Makefile.include, so it is not affected by the extended
EXTRA_CFLAGS.

Append EXTRA_CFLAGS to CFLAGS only after including Makefile.include and
place it last so that the extra flags propagate properly and can
override the default options.

tools/scripts/Makefile.include already appends $(CLANG_CROSS_FLAGS) to
CFLAGS, the Makefile appends $(CLANG_CROSS_FLAGS) again, remove the
redundant append.

Signed-off-by: Leo Yan 
Acked-by: Ihor Solodrai 
Link: https://lore.kernel.org/r/20260602-tools_build_fix_zero_init_bpf_only-v2-4-c76e5250ea1c@arm.com
Signed-off-by: Alexei Starovoitov

libbpf: Add path_fd to struct bpf_link_create_opts

2026-06-15T00:24:25+00:00

Adding the path_fd field to struct bpf_link_create_opts and passing it
through kernel attr interface.

Assisted-by: Codex:GPT-5.4
Signed-off-by: Jiri Olsa 
Link: https://lore.kernel.org/r/20260611114230.950379-5-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov

libbpf: Add support to create tracing multi link

2026-06-07T17:03:02+00:00

Adding bpf_program__attach_tracing_multi function for attaching
tracing program to multiple functions.

  struct bpf_link *
  bpf_program__attach_tracing_multi(const struct bpf_program *prog,
                                    const char *pattern,
                                    const struct bpf_tracing_multi_opts *opts);

User can specify functions to attach with 'pattern' argument that
allows wildcards (*?' supported) or provide BTF ids of functions
in array directly via opts argument. These options are mutually
exclusive.

When using BTF ids, user can also provide cookie value for each
provided id/function, that can be retrieved later in bpf program
with bpf_get_attach_cookie helper. Each cookie value is paired with
provided BTF id with the same array index.

Adding support to auto attach programs with following sections:

  fsession.multi/
  fsession.multi.s/
  fentry.multi/
  fexit.multi/
  fentry.multi.s/
  fexit.multi.s/

The provided  is used as 'pattern' argument in
bpf_program__attach_kprobe_multi_opts function.

The  allows to specify optional kernel module name with
following syntax:

  :

In order to attach tracing_multi link to a module functions:
- program must be loaded with 'module' btf fd
  (in attr::attach_btf_obj_fd)
- bpf_program__attach_tracing_multi must either have
  pattern with module spec or BTF ids from the module

Signed-off-by: Jiri Olsa 
Link: https://lore.kernel.org/r/20260606123955.345967-21-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov

libbpf: Add btf_type_is_traceable_func function

2026-06-07T17:03:02+00:00

Adding btf_type_is_traceable_func function to perform same checks
as the kernel's btf_distill_func_proto function to prevent attachment
on some of the functions.

Exporting the function via libbpf_internal.h because it will be used
by benchmark test in following changes.

Signed-off-by: Jiri Olsa 
Link: https://lore.kernel.org/r/20260606123955.345967-20-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov

libbpf: Add bpf_link_create support for tracing_multi link

2026-06-07T17:03:02+00:00

Adding bpf_link_create support for tracing_multi link with
new tracing_multi record in struct bpf_link_create_opts.

Signed-off-by: Jiri Olsa 
Link: https://lore.kernel.org/r/20260606123955.345967-19-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov

libbpf: Add bpf_object_cleanup_btf function

2026-06-07T17:03:02+00:00

Adding bpf_object_cleanup_btf function to cleanup btf objects.
It will be used in following changes.

Signed-off-by: Jiri Olsa 
Link: https://lore.kernel.org/r/20260606123955.345967-18-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov

bpf: Add support for tracing_multi link session

2026-06-07T17:03:01+00:00

Adding support to use session attachment with tracing_multi link.

Adding new BPF_TRACE_FSESSION_MULTI program attach type, that follows
the BPF_TRACE_FSESSION behaviour but on the tracing_multi link.

Such program is called on entry and exit of the attached function
and allows to pass cookie value from entry to exit execution.

Signed-off-by: Jiri Olsa 
Link: https://lore.kernel.org/r/20260606123955.345967-16-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov