mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-03 04:01:43 +08:00
85 lines
2.4 KiB
C
85 lines
2.4 KiB
C
|
/* Test of signal delivery on an alternate stack with MINSIGSTKSZ size.
|
||
|
|
Copyright (C) 2020 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/>. */
|
||
|
|
|
||
|
|
#include <signal.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <string.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
#include <support/check.h>
|
||
|
|
#include <support/support.h>
|
||
|
|
|
||
|
|
static volatile sig_atomic_t handler_run;
|
||
|
|
|
||
|
|
static void
|
||
|
|
handler (int signo)
|
||
|
|
{
|
||
|
|
/* Clear a bit of on-stack memory. */
|
||
|
|
volatile char buffer[256];
|
||
|
|
for (size_t i = 0; i < sizeof (buffer); ++i)
|
||
|
|
buffer[i] = 0;
|
||
|
|
handler_run = 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
int
|
||
|
|
do_test (void)
|
||
|
|
{
|
||
|
|
size_t stack_buffer_size = 64 * 1024 * 1024;
|
||
|
|
void *stack_buffer = xmalloc (stack_buffer_size);
|
||
|
|
void *stack_end = stack_buffer + stack_buffer_size;
|
||
|
|
memset (stack_buffer, 0xCC, stack_buffer_size);
|
||
|
|
|
||
|
|
void *stack_bottom = stack_buffer + (stack_buffer_size + MINSIGSTKSZ) / 2;
|
||
|
|
void *stack_top = stack_bottom + MINSIGSTKSZ;
|
||
|
|
stack_t stack =
|
||
|
|
{
|
||
|
|
.ss_sp = stack_bottom,
|
||
|
|
.ss_size = MINSIGSTKSZ,
|
||
|
|
};
|
||
|
|
if (sigaltstack (&stack, NULL) < 0)
|
||
|
|
FAIL_RET ("sigaltstack: %m\n");
|
||
|
|
|
||
|
|
struct sigaction act =
|
||
|
|
{
|
||
|
|
.sa_handler = handler,
|
||
|
|
.sa_flags = SA_ONSTACK,
|
||
|
|
};
|
||
|
|
if (sigaction (SIGUSR1, &act, NULL) < 0)
|
||
|
|
FAIL_RET ("sigaction: %m\n");
|
||
|
|
|
||
|
|
if (kill (getpid (), SIGUSR1) < 0)
|
||
|
|
FAIL_RET ("kill: %m\n");
|
||
|
|
|
||
|
|
if (handler_run != 1)
|
||
|
|
FAIL_RET ("handler did not run\n");
|
||
|
|
|
||
|
|
for (void *p = stack_buffer; p < stack_bottom; ++p)
|
||
|
|
if (*(unsigned char *) p != 0xCC)
|
||
|
|
FAIL_RET ("changed byte %ld bytes below configured stack\n",
|
||
|
|
(long) (stack_bottom - p));
|
||
|
|
for (void *p = stack_top; p < stack_end; ++p)
|
||
|
|
if (*(unsigned char *) p != 0xCC)
|
||
|
|
FAIL_RET ("changed byte %ld bytes above configured stack\n",
|
||
|
|
(long) (p - stack_top));
|
||
|
|
|
||
|
|
free (stack_buffer);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
#include <support/test-driver.c>
|