On Tue, 29 Jun 2021 09:21:19 +0200
Thomas Richter [off-list ref] wrote:

On 6/29/21 7:02 AM, Masami Hiramatsu wrote:

quoted

On Fri, 25 Jun 2021 12:43:29 +0200
Thomas Richter [off-list ref] wrote:

Masami,

here is more info on this issue:

# nm /usr/lib64/libc-2.33.so 
00000000000a7f30 t __GI_memchr
00000000000a3730 t __GI_memcmp
00000000000a37e0 t __GI_memcpy
00000000000a39a0 t __GI_memmove
00000000000a37d0 t __GI_mempcpy
00000000000a8000 t __GI___rawmemchr
00000000000a6070 t __GI_stpcpy
000000000009d190 t __GI___strcasecmp_l
00000000000a67a0 t __GI_strcat
00000000000a6ec0 t __GI_strchr
00000000000a6b70 t __GI_strcmp
00000000000a5f70 t __GI_strcpy
00000000000a7c70 t __GI_strcspn
00000000000a5ad0 t __GI_strlen
000000000009d200 t __GI___strncasecmp_l
00000000000a6ce0 t __GI_strncmp
00000000000a62a0 t __GI_strncpy
00000000000a5d30 t __GI_strnlen
00000000000a73e0 t __GI_strrchr
00000000000b8e80 t __GI_wmemchr
0000000000111f60 T __memcpy_chk
0000000000111f80 T __memmove_chk
0000000000112040 T __stpcpy_chk
0000000000112100 T __strcpy_chk
# 

These are the entries in the .symtab section and can be used by perf:
# ./perf probe -vvv -f -x /usr/lib64/libc-2.33.so -a __strcpy_chk

Are there any output of the perf probe? It may report that the
event is found by map (symbol) or debuginfo.

# ./perf probe -l
  probe_libc:__strcpy_chk (on __strcpy_chk@debug/strcpy_chk.c in /usr/lib64/libc-2.33.so)
[root@t35lp46 perf]# 

Thanks! So at least the symbols in .symtab works.

Hope this helps
-- 
Thomas Richter, Dept 3303, IBM s390 Linux Development, Boeblingen, Germany
--
Vorsitzender des Aufsichtsrats: Gregor Pillen
Geschäftsführung: Dirk Wittkopp
Sitz der Gesellschaft: Böblingen / Registergericht: Amtsgericht Stuttgart, HRB 243294

-- 
Masami Hiramatsu [off-list ref]