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bpf: Support ->fill_link_info for kprobe_multi

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With the addition of support for fill_link_info to the kprobe_multi link,
users will gain the ability to inspect it conveniently using the
`bpftool link show`. This enhancement provides valuable information to the
user, including the count of probed functions and their respective
addresses. It's important to note that if the kptr_restrict setting is not
permitted, the probed address will not be exposed, ensuring security.

Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20230709025630.3735-2-laoar.shao@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Yafang Shao
2023-07-09 02:56:21 +00:00
committed by Alexei Starovoitov
parent 07018b5706
commit 7ac8d0d261
3 changed files with 47 additions and 0 deletions
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5
tools/include/uapi/linux/bpf.h
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@@ -6439,6 +6439,11 @@ struct bpf_link_info {
__s32 priority;
__u32 flags;
} netfilter;
struct {
__aligned_u64 addrs;
__u32 count; /* in/out: kprobe_multi function count */
__u32 flags;
} kprobe_multi;
};
} __attribute__((aligned(8)));