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glibc/debug/tst-longjmp_chk.c
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/* Basic test to make sure doing a longjmp to a jmpbuf with an invalid sp | |
is caught by the fortification code. */ | |
#include <errno.h> | |
#include <fcntl.h> | |
#include <paths.h> | |
#include <setjmp.h> | |
#include <signal.h> | |
#include <stdbool.h> | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <unistd.h> | |
static int do_test(void); | |
#define TEST_FUNCTION do_test () | |
#include "../test-skeleton.c" | |
static jmp_buf b; | |
static void | |
__attribute__ ((noinline)) | |
f (void) | |
{ | |
char buf[1000]; | |
asm volatile ("" : "=m" (buf)); | |
if (setjmp (b) != 0) | |
{ | |
puts ("second longjmp succeeded"); | |
exit (1); | |
} | |
} | |
static bool expected_to_fail; | |
static void | |
handler (int sig) | |
{ | |
if (expected_to_fail) | |
_exit (0); | |
else | |
{ | |
static const char msg[] = "unexpected longjmp failure\n"; | |
TEMP_FAILURE_RETRY (write (STDOUT_FILENO, msg, sizeof (msg) - 1)); | |
_exit (1); | |
} | |
} | |
static int | |
do_test (void) | |
{ | |
set_fortify_handler (handler); | |
expected_to_fail = false; | |
if (setjmp (b) == 0) | |
{ | |
longjmp (b, 1); | |
/* NOTREACHED */ | |
printf ("first longjmp returned\n"); | |
return 1; | |
} | |
expected_to_fail = true; | |
f (); | |
longjmp (b, 1); | |
puts ("second longjmp returned"); | |
return 1; | |
} |