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For instance on x86_64 with gcc 12.1.1 andwith fstack-protector
enabled the empty function still generates a stack protector code
sequence:
0000000000000000 <_dl_relocate_static_pie>:
0: 48 83 ec 18 sub $0x18,%rsp
4: 64 48 8b 04 25 28 00 mov %fs:0x28,%rax
b: 00 00
d: 48 89 44 24 08 mov %rax,0x8(%rsp)
12: 31 c0 xor %eax,%eax
14: 48 8b 44 24 08 mov 0x8(%rsp),%rax
19: 64 48 2b 04 25 28 00 sub %fs:0x28,%rax
20: 00 00
22: 75 05 jne 29 <_dl_relocate_static_pie+0x29>
24: 48 83 c4 18 add $0x18,%rsp
28: c3 ret
29: e8 00 00 00 00 call 2e <_dl_relocate_static_pie+0x2e>
And since the function is called prior thread pointer setup, it
triggers a invalid memory access (this is shown with the failure
of elf/tst-tls1-static-non-pie).
Although it might characterizes as compiler issue or missed
optimization, to be safe also disables stack protector on
static-reloc object.
Checked on x86_64-linux-gnu and sparc64-linux-gnu.
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
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| .. | ||
| abi-note.c | ||
| check_fds.c | ||
| dso_handle.c | ||
| errno-loc.c | ||
| errno.c | ||
| gmon-start.c | ||
| init-first.c | ||
| init.c | ||
| libc-start.c | ||
| libc-tls.c | ||
| Makefile | ||
| rtld-sizes.sym | ||
| start.c | ||
| static-reloc.c | ||
| sysdep.c | ||
| version.c | ||
| Versions | ||