Re: [PATCH bpf-next 0/2] bpf: Reject BTF ids with the same address in tracing_multi link

[Jiri Olsa <olsajiri@gmail.com>]

On Sun, Oct 11, 2026 at 04:48:34PM +0000, Alexei Starovoitov wrote:
> From: Alexei Starovoitov <ast@kernel.org>
> 
> tracing_multi link accepts different BTF ids that resolve to the same
> address. The attach succeeds, the detach fails in ftrace and the kernel
> crashes in freed trampoline images.
> 'test_progs -t tracing_multi' hits it when the kernel is built with
> CONFIG_DEBUG_INFO_BTF_INLINE. Without it the ids of aliased functions do
> the same.
> 
> Patch 1 - the fix.
> Patch 2 - selftest.
> 
> Signed-off-by: Alexei Starovoitov <ast@kernel.org>

nice, fwiw:

Acked-by: Jiri Olsa <jolsa@kernel.org>

thanks,
jirka


> 
> Alexei Starovoitov (2):
>   bpf: Reject BTF ids with the same address in tracing_multi link
>   selftests/bpf: Test tracing_multi link with BTF ids of the same
>     address
> 
>  include/linux/ftrace.h                        |  1 +
>  kernel/bpf/trampoline.c                       |  8 ++
>  kernel/trace/trace.h                          |  3 -
>  .../selftests/bpf/prog_tests/tracing_multi.c  | 99 +++++++++++++++++++
>  4 files changed, 108 insertions(+), 3 deletions(-)
> 
> -- 
> 2.55.0
> 
>