mirror of
https://sourceware.org/git/glibc.git
synced 2024-09-18 23:49:57 +00:00
97 lines
2.4 KiB
C
97 lines
2.4 KiB
C
/* Check longjmp from user context to main context.
|
|
Copyright (C) 2023-2024 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, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
/* When _FORTIFY_SOURCE is defined to 2, ____longjmp_chk is called,
|
|
instead of longjmp. ____longjmp_chk compares the relative stack
|
|
values to decide if it is called from a stack frame which called
|
|
setjmp. If not, ____longjmp_chk assumes that an alternate signal
|
|
stack is used. Since comparing the relative stack values isn't
|
|
reliable with user context, when there is no signal, ____longjmp_chk
|
|
will fail. Undefine _FORTIFY_SOURCE to avoid ____longjmp_chk. */
|
|
#undef _FORTIFY_SOURCE
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <setjmp.h>
|
|
#include <ucontext.h>
|
|
#include <unistd.h>
|
|
|
|
static jmp_buf jmpbuf;
|
|
static ucontext_t ctx;
|
|
|
|
static void f2 (void);
|
|
|
|
static void
|
|
__attribute__ ((noinline, noclone))
|
|
f1 (void)
|
|
{
|
|
printf ("start f1\n");
|
|
f2 ();
|
|
}
|
|
|
|
static void
|
|
__attribute__ ((noinline, noclone))
|
|
f2 (void)
|
|
{
|
|
printf ("start f2\n");
|
|
if (setcontext (&ctx) != 0)
|
|
{
|
|
printf ("%s: setcontext: %m\n", __FUNCTION__);
|
|
exit (EXIT_FAILURE);
|
|
}
|
|
}
|
|
|
|
static void
|
|
f3 (void)
|
|
{
|
|
printf ("start f3\n");
|
|
longjmp (jmpbuf, 1);
|
|
}
|
|
|
|
static int
|
|
__attribute__ ((noinline, noclone))
|
|
do_test_1 (void)
|
|
{
|
|
char st1[32768];
|
|
|
|
if (setjmp (jmpbuf) != 0)
|
|
return 0;
|
|
|
|
puts ("making contexts");
|
|
if (getcontext (&ctx) != 0)
|
|
{
|
|
printf ("%s: getcontext: %m\n", __FUNCTION__);
|
|
exit (EXIT_FAILURE);
|
|
}
|
|
ctx.uc_stack.ss_sp = st1;
|
|
ctx.uc_stack.ss_size = sizeof st1;
|
|
ctx.uc_link = NULL;
|
|
makecontext (&ctx, (void (*) (void)) f3, 0);
|
|
f1 ();
|
|
puts ("FAIL: returned from f1 ()");
|
|
exit (EXIT_FAILURE);
|
|
}
|
|
|
|
static int
|
|
do_test (void)
|
|
{
|
|
return do_test_1 ();
|
|
}
|
|
|
|
#include <support/test-driver.c>
|