https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87702
Uroš Bizjak <ubizjak at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #10 from Uroš Bizjak <ubizjak at gmail dot com> ---
Same issue for the second test. Something calls __sscanf with misaligned stack:
Breakpoint 1, __sscanf (
s=0xffffc1a7 " 357383 799 0 0 0 0 0 1
88505 798 0 0 0 0 0 0\n", format=0x80ae357
"%llu%llu%u%u%u%u%u%u%llu%llu%u%u%u%u%u%u") at sscanf.c:27
27 in sscanf.c
(gdb) disass
Dump of assembler code for function __sscanf:
=> 0xf7e5c100 <+0>: push %ebx
0xf7e5c101 <+1>: call 0xf7f278a5 <__x86.get_pc_thunk.bx>
0xf7e5c106 <+6>: add $0x16defa,%ebx
0xf7e5c10c <+12>: sub $0x8,%esp
0xf7e5c10f <+15>: lea 0x18(%esp),%eax
0xf7e5c113 <+19>: sub $0x4,%esp
0xf7e5c116 <+22>: push %eax
0xf7e5c117 <+23>: pushl 0x1c(%esp)
0xf7e5c11b <+27>: pushl 0x1c(%esp)
0xf7e5c11f <+31>: call 0xf7e619c0 <_IO_vsscanf>
0xf7e5c124 <+36>: add $0x18,%esp
0xf7e5c127 <+39>: pop %ebx
0xf7e5c128 <+40>: ret
End of assembler dump.
(gdb) i r $sp
sp 0xffffc134 0xffffc134
(gdb) up
#1 0x080568b3 in ?? ()
(gdb) i r $sp
sp 0xffffc138 0xffffc138
Please report these issues to busybox, there is nothing wrong with the compiler
or glibc.
BTW: Provided busybox binary was stripped, so the backtrace doesn't show the
caller name, only:
#2 0xf7e5c124 in __sscanf (
s=0xffffc1a7 " 355021 777 0 0 0 0 0 1
86884 779 0 0 0 0 0 0\n", format=0x80ae357
"%llu%llu%u%u%u%u%u%u%llu%llu%u%u%u%u%u%u") at sscanf.c:32
#3 0x080568b3 in ?? ()
#4 0x31323035 in ?? ()
#5 0x20202020 in ?? ()
#6 0x37373720 in ?? ()
Anyway, not our bugs.
