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* sysdeps/unix/sysv/linux/i386/makecontext.S (__makecontext): Avoid

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clobbering memory at or above uc_stack.ss_sp + uc_stack.ss_size.
	* stdlib/Makefile: Add rules to build and run tst-makecontext2.
	* stdlib/tst-makecontext2.c: New test.
This commit is contained in:
Ulrich Drepper
2008-01-09 19:35:21 +00:00
parent 71edcafa97
commit 148e12ed12
4 changed files with 97 additions and 6 deletions
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80
stdlib/tst-makecontext2.c Normal file
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@@ -0,0 +1,80 @@
/* Copyright (C) 2008 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ucontext.h>
#include <tst-stack-align.h>
ucontext_t ucp, ucp2;
char st1[262144] __attribute__((aligned (16)));
void
cf (int i, int j)
{
if (i != 78 || j != 274)
{
printf ("i %d j %d\n", i, j);
exit (1);
}
else if (TEST_STACK_ALIGN ())
{
puts ("insufficiently aligned stack");
exit (2);
}
}
int
do_test (void)
{
for (size_t j = 32; j < 64; j += sizeof (long))
{
if (getcontext (&ucp) != 0)
{
if (errno == ENOSYS)
{
puts ("context handling not supported");
return 0;
}
puts ("getcontext failed");
return 1;
}
ucp.uc_link = &ucp2;
ucp.uc_stack.ss_sp = st1;
ucp.uc_stack.ss_size = sizeof (st1) - j;
memset (&st1[sizeof (st1) - j], 0x55, j);
makecontext (&ucp, (void (*) (void)) cf, 2, 78, 274);
if (swapcontext (&ucp2, &ucp) != 0)
{
puts ("setcontext failed");
return 1;
}
for (size_t i = j; i > 0; i--)
if (st1[sizeof (st1) - j + i - 1] != 0x55)
{ printf ("fail %zd %zd\n", i, j); break; }
}
return 0;
}
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"