bpf: show real jited address in bpf_prog_info->jited_ksyms
authorSong Liu <songliubraving@fb.com>
Fri, 2 Nov 2018 17:16:16 +0000 (10:16 -0700)
committerDaniel Borkmann <daniel@iogearbox.net>
Fri, 2 Nov 2018 20:39:01 +0000 (21:39 +0100)
commitde57e99ceb65d0d7775cc14a8ba5931d7de1d708
tree9c45547a04bce09403e85d8c3f046d9bbc7950da
parentdf0734702a7cbba49d6765bd5ba069340bf9c5db
bpf: show real jited address in bpf_prog_info->jited_ksyms

Currently, jited_ksyms in bpf_prog_info shows page addresses of jited
bpf program. The main reason here is to not expose randomized start
address. However, this is not ideal for detailed profiling (find hot
instructions from stack traces). This patch replaces the page address
with real prog start address.

This change is OK because bpf_prog_get_info_by_fd() is only available
to root.

Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
kernel/bpf/syscall.c