Commit cd3910d0 authored by Yafang Shao's avatar Yafang Shao Committed by Alexei Starovoitov
Browse files

bpf: Expose symbol's respective address 



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: default avatarYafang Shao <laoar.shao@gmail.com>
Acked-by: default avatarJiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/r/20230709025630.3735-7-laoar.shao@gmail.com


Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent 5125e757

kernel/trace/trace_kprobe.c

+4 −12
Original line number Diff line number Diff line
@@ -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_addr = kallsyms_show_value(current_cred()) ?

		      (unsigned long)tk->rp.kp.addr : 0;

	*symbol = tk->symbol;

	return 0;

}

#endif	/* CONFIG_PERF_EVENTS */