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bpf, x86: Attach a cookie to fentry/fexit/fmod_ret/lsm.

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Pass a cookie along with BPF_LINK_CREATE requests.

Add a bpf_cookie field to struct bpf_tracing_link to attach a cookie.
The cookie of a bpf_tracing_link is available by calling
bpf_get_attach_cookie when running the BPF program of the attached
link.

The value of a cookie will be set at bpf_tramp_run_ctx by the
trampoline of the link.

Signed-off-by: Kui-Feng Lee <kuifeng@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20220510205923.3206889-4-kuifeng@fb.com
This commit is contained in:
Kui-Feng Lee
2022-05-10 13:59:21 -07:00
committed by Andrii Nakryiko
parent e384c7b7b4
commit 2fcc82411e
8 changed files with 69 additions and 8 deletions
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9
tools/include/uapi/linux/bpf.h
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@@ -1490,6 +1490,15 @@ union bpf_attr {
__aligned_u64 addrs;
__aligned_u64 cookies;
} kprobe_multi;
struct {
/* this is overlaid with the target_btf_id above. */
__u32 target_btf_id;
/* black box user-provided value passed through
* to BPF program at the execution time and
* accessible through bpf_get_attach_cookie() BPF helper
*/
__u64 cookie;
} tracing;
};
} link_create;