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stdlib/tst-setcontext.c: Check for clobbering of signal stack

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On aarch64 calling swapcontext clobbers the state of the signal
stack (BZ #16629). Check that the address and size of the signal
stack before and after the call to swapcontext remains the same.

ChangeLog:

2014-04-17  Will Newton  <will.newton@linaro.org>

	[BZ #16629]
	* stdlib/tst-setcontext.c: Include signal.h.
	(main): Check that the signal stack before and
	after swapcontext is the same.
This commit is contained in:
Will Newton 2014-02-25 14:29:32 +00:00
parent 37d3500738
commit e04a4e9d2e
2 changed files with 25 additions and 0 deletions
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4
ChangeLog
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@ -1,6 +1,10 @@
2014-04-17 Will Newton <will.newton@linaro.org>
[BZ #16629]
* stdlib/tst-setcontext.c: Include signal.h.
(main): Check that the signal stack before and
after swapcontext is the same.
* sysdeps/unix/sysv/linux/aarch64/setcontext.S (__setcontext):
Re-implement to restore registers in user code and avoid
rt_sigreturn system call.

21
stdlib/tst-setcontext.c
View File

@ -16,6 +16,7 @@
<http://www.gnu.org/licenses/>. */
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
@ -144,6 +145,9 @@ main (void)
atexit (check_called);
char st1[32768];
stack_t stack_before, stack_after;
sigaltstack(NULL, &stack_before);
puts ("making contexts");
if (getcontext (&ctx[1]) != 0)
@ -207,6 +211,8 @@ main (void)
puts ("back at main program");
back_in_main = 1;
sigaltstack(NULL, &stack_after);
if (was_in_f1 == 0)
{
puts ("didn't reach f1");
@ -218,6 +224,21 @@ main (void)
exit (1);
}
/* Check sigaltstack state is not clobbered as in BZ #16629. */
if (stack_before.ss_sp != stack_after.ss_sp)
{
printf ("stack ss_sp mismatch: %p %p\n",
stack_before.ss_sp, stack_after.ss_sp);
exit (1);
}
if (stack_before.ss_size != stack_after.ss_size)
{
printf ("stack ss_size mismatch: %zd %zd\n",
stack_before.ss_size, stack_after.ss_size);
exit (1);
}
puts ("test succeeded");
return 0;
}