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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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|---|---|---|
| .. | ||
| n32 | ||
| n64 | ||
| __longjmp.c | ||
| add_n.S | ||
| addmul_1.S | ||
| bsd-_setjmp.S | ||
| bsd-setjmp.S | ||
| e_sqrtl.c | ||
| gmp-mparam.h | ||
| Implies | ||
| libm-test-ulps | ||
| libm-test-ulps-name | ||
| lshift.S | ||
| Makefile | ||
| mul_1.S | ||
| rshift.S | ||
| setjmp_aux.c | ||
| setjmp.S | ||
| sfp-machine.h | ||
| sub_n.S | ||
| submul_1.S | ||
| Versions | ||