mirror of git://sourceware.org/git/glibc.git
368b6c8da9
When configured as --enable-stack-protector=all glibc
inserts stack checking canary into every function
including __sigsetjmp_aux(). Stack checking code
ends up using s0 register to temporary hold address
of global canary value.
Unfortunately __sigsetjmp_aux assumes no caller' caller-save
registers should be clobbered as it stores them as-is.
The fix is to disable stack protection of __sigsetjmp_aux.
Tested on the following test:
#include <setjmp.h>
#include <stdio.h>
int main() {
jmp_buf jb;
volatile register long s0 asm ("$s0");
s0 = 1234;
if (setjmp(jb) == 0)
longjmp(jb, 1);
printf ("$s0 = %lu\n", s0);
}
Without the fix:
$ qemu-mipsn32 -L . ./mips-longjmp-bug
$s0 = 1082346228
With the fix:
$ qemu-mipsn32 -L . ./mips-longjmp-bug
$s0 = 1234
[BZ #22624]
* sysdeps/mips/mips64/setjmp_aux.c (__sigsetjmp_aux): Use
inhibit_stack_protector.
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| .. | ||
| aarch64 | ||
| alpha | ||
| arm | ||
| generic | ||
| gnu | ||
| hppa | ||
| i386 | ||
| ia64 | ||
| ieee754 | ||
| init_array | ||
| m68k | ||
| mach | ||
| microblaze | ||
| mips | ||
| nios2 | ||
| nptl | ||
| posix | ||
| powerpc | ||
| pthread | ||
| s390 | ||
| sh | ||
| sparc | ||
| tile | ||
| unix | ||
| wordsize-32 | ||
| wordsize-64 | ||
| x86 | ||
| x86_64 | ||