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| author | Jiri Olsa <jolsa@kernel.org> | 2023-06-18 15:14:14 +0200 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2023-06-21 10:40:26 +0200 |
| commit | db8eae6bc5c702d8e3ab2d0c6bb5976c131576eb (patch) | |
| tree | 55dc43cb0a123be61f02717998ee763728038c5e /kernel/bpf/core.c | |
| parent | 9724160b3942b0a967b91a59f81da5593f28b8ba (diff) | |
bpf: Force kprobe multi expected_attach_type for kprobe_multi link
We currently allow to create perf link for program with
expected_attach_type == BPF_TRACE_KPROBE_MULTI.
This will cause crash when we call helpers like get_attach_cookie or
get_func_ip in such program, because it will call the kprobe_multi's
version (current->bpf_ctx context setup) of those helpers while it
expects perf_link's current->bpf_ctx context setup.
Making sure that we use BPF_TRACE_KPROBE_MULTI expected_attach_type
only for programs attaching through kprobe_multi link.
Fixes: ca74823c6e16 ("bpf: Add cookie support to programs attached with kprobe multi link")
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20230618131414.75649-1-jolsa@kernel.org
Diffstat (limited to 'kernel/bpf/core.c')
0 files changed, 0 insertions, 0 deletions