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bpf: Expose symbol's respective address

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Since different symbols can share the same name, it is insufficient to only
expose the symbol name. It is essential to also expose the symbol address
so that users can accurately identify which one is being probed.

Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/r/20230709025630.3735-7-laoar.shao@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Yafang Shao 2023-07-09 02:56:26 +00:00 committed by Alexei Starovoitov
parent 5125e757e6
commit cd3910d005
1 changed files with 4 additions and 12 deletions
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16
kernel/trace/trace_kprobe.c
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@ -1544,18 +1544,10 @@ int bpf_get_kprobe_info(const struct perf_event *event, u32 *fd_type,
*fd_type = trace_kprobe_is_return(tk) ? BPF_FD_TYPE_KRETPROBE
: BPF_FD_TYPE_KPROBE;
if (tk->symbol) {
*symbol = tk->symbol;
*probe_offset = tk->rp.kp.offset;
*probe_addr = 0;
} else {
*symbol = NULL;
*probe_offset = 0;
if (kallsyms_show_value(current_cred()))
*probe_addr = (unsigned long)tk->rp.kp.addr;
else
*probe_addr = 0;
}
*probe_offset = tk->rp.kp.offset;
*probe_addr = kallsyms_show_value(current_cred()) ?
(unsigned long)tk->rp.kp.addr : 0;
*symbol = tk->symbol;
return 0;
}
#endif /* CONFIG_PERF_EVENTS */