bpf: Add support for kprobe session cookie

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Adding support for cookie within the session of kprobe multi
entry and return program.

The session cookie is u64 value and can be retrieved be new
kfunc bpf_session_cookie, which returns pointer to the cookie
value. The bpf program can use the pointer to store (on entry)
and load (on return) the value.

The cookie value is implemented via fprobe feature that allows
to share values between entry and return ftrace fprobe callbacks.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20240430112830.1184228-4-jolsa@kernel.org

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Jiri Olsa 2024-04-30 13:28:26 +02:00 • committed by Andrii Nakryiko

parent adf46d88ae

commit 5c919acef8

2 changed files with 23 additions and 3 deletions

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7

kernel/bpf/verifier.c

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19

kernel/trace/bpf_trace.c

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