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glibc/debug/tst-chk1.c

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/* Copyright (C) 2004 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Jakub Jelinek <jakub@redhat.com>, 2004.
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 <setjmp.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
char *temp_filename;
static void do_prepare (void);
static int do_test (void);
#define PREPARE(argc, argv) do_prepare ()
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"
static void
do_prepare (void)
{
int temp_fd = create_temp_file ("tst-chk1.", &temp_filename);
if (temp_fd == -1)
{
printf ("cannot create temporary file: %m\n");
exit (1);
}
const char *strs = "abcdefgh\nABCDEFGHI\nabcdefghij\nABCDEFGHIJ";
if (write (temp_fd, strs, strlen (strs)) != strlen (strs))
{
puts ("could not write test strings into file");
unlink (temp_filename);
exit (1);
}
}
volatile int chk_fail_ok;
jmp_buf chk_fail_buf;
static void
handler (int sig)
{
if (chk_fail_ok)
{
chk_fail_ok = 0;
longjmp (chk_fail_buf, 1);
}
else
_exit (127);
}
char buf[10];
volatile size_t l0;
volatile char *p;
const char *str1 = "JIHGFEDCBA";
const char *str2 = "F";
const char *str3 = "%s%n%s%n";
const char *str4 = "Hello, ";
const char *str5 = "World!\n";
char buf2[10] = "%s";
int num1 = 67;
int num2 = 987654;
#define FAIL() \
do { printf ("Failure on line %d\n", __LINE__); ret = 1; } while (0)
#define CHK_FAIL_START \
chk_fail_ok = 1; \
if (! setjmp (chk_fail_buf)) \
{
#define CHK_FAIL_END \
chk_fail_ok = 0; \
FAIL (); \
ret = 1; \
}
#if __USE_FORTIFY_LEVEL >= 2
#define CHK_FAIL2_START CHK_FAIL_START
#define CHK_FAIL2_END CHK_FAIL_END
#else
#define CHK_FAIL2_START
#define CHK_FAIL2_END
#endif
static int
do_test (void)
{
int ret = 0;
struct sigaction sa;
sa.sa_handler = handler;
sa.sa_flags = 0;
sigemptyset (&sa.sa_mask);
sigaction (SIGABRT, &sa, NULL);
struct A { char buf1[9]; char buf2[1]; } a;
printf ("Test checking routines at fortify level %d\n",
#ifdef __USE_FORTIFY_LEVEL
(int) __USE_FORTIFY_LEVEL
#else
0
#endif
);
/* These ops can be done without runtime checking of object size. */
memcpy (buf, "abcdefghij", 10);
memmove (buf + 1, buf, 9);
if (memcmp (buf, "aabcdefghi", 10))
FAIL ();
if (mempcpy (buf + 5, "abcde", 5) != buf + 10 || memcmp (buf, "aabcdabcde", 10))
FAIL ();
memset (buf + 8, 'j', 2);
if (memcmp (buf, "aabcdabcjj", 10))
FAIL ();
strcpy (buf + 4, "EDCBA");
if (memcmp (buf, "aabcEDCBA", 10))
FAIL ();
if (stpcpy (buf + 8, "F") != buf + 9 || memcmp (buf, "aabcEDCBF", 10))
FAIL ();
strncpy (buf + 6, "X", 4);
if (memcmp (buf, "aabcEDX\0\0", 10))
FAIL ();
if (sprintf (buf + 7, "%s", "67") != 2 || memcmp (buf, "aabcEDX67", 10))
FAIL ();
if (snprintf (buf + 7, 3, "%s", "987654") != 6
|| memcmp (buf, "aabcEDX98", 10))
FAIL ();
/* These ops need runtime checking, but shouldn't __chk_fail. */
memcpy (buf, "abcdefghij", l0 + 10);
memmove (buf + 1, buf, l0 + 9);
if (memcmp (buf, "aabcdefghi", 10))
FAIL ();
if (mempcpy (buf + 5, "abcde", l0 + 5) != buf + 10 || memcmp (buf, "aabcdabcde", 10))
FAIL ();
memset (buf + 8, 'j', l0 + 2);
if (memcmp (buf, "aabcdabcjj", 10))
FAIL ();
strcpy (buf + 4, str1 + 5);
if (memcmp (buf, "aabcEDCBA", 10))
FAIL ();
if (stpcpy (buf + 8, str2) != buf + 9 || memcmp (buf, "aabcEDCBF", 10))
FAIL ();
strncpy (buf + 6, "X", l0 + 4);
if (memcmp (buf, "aabcEDX\0\0", 10))
FAIL ();
if (sprintf (buf + 7, "%d", num1) != 2 || memcmp (buf, "aabcEDX67", 10))
FAIL ();
if (snprintf (buf + 7, 3, "%d", num2) != 6 || memcmp (buf, "aabcEDX98", 10))
FAIL ();
buf[l0 + 8] = '\0';
strcat (buf, "A");
if (memcmp (buf, "aabcEDX9A", 10))
FAIL ();
buf[l0 + 7] = '\0';
strncat (buf, "ZYXWV", l0 + 2);
if (memcmp (buf, "aabcEDXZY", 10))
FAIL ();
memcpy (a.buf1, "abcdefghij", l0 + 10);
memmove (a.buf1 + 1, a.buf1, l0 + 9);
if (memcmp (a.buf1, "aabcdefghi", 10))
FAIL ();
if (mempcpy (a.buf1 + 5, "abcde", l0 + 5) != a.buf1 + 10
|| memcmp (a.buf1, "aabcdabcde", 10))
FAIL ();
memset (a.buf1 + 8, 'j', l0 + 2);
if (memcmp (a.buf1, "aabcdabcjj", 10))
FAIL ();
#if __USE_FORTIFY_LEVEL < 2
/* The following tests are supposed to crash with -D_FORTIFY_SOURCE=2
and sufficient GCC support, as the string operations overflow
from a.buf1 into a.buf2. */
strcpy (a.buf1 + 4, str1 + 5);
if (memcmp (a.buf1, "aabcEDCBA", 10))
FAIL ();
if (stpcpy (a.buf1 + 8, str2) != a.buf1 + 9 || memcmp (a.buf1, "aabcEDCBF", 10))
FAIL ();
strncpy (a.buf1 + 6, "X", l0 + 4);
if (memcmp (a.buf1, "aabcEDX\0\0", 10))
FAIL ();
if (sprintf (a.buf1 + 7, "%d", num1) != 2 || memcmp (a.buf1, "aabcEDX67", 10))
FAIL ();
if (snprintf (a.buf1 + 7, 3, "%d", num2) != 6
|| memcmp (a.buf1, "aabcEDX98", 10))
FAIL ();
a.buf1[l0 + 8] = '\0';
strcat (a.buf1, "A");
if (memcmp (a.buf1, "aabcEDX9A", 10))
FAIL ();
a.buf1[l0 + 7] = '\0';
strncat (a.buf1, "ZYXWV", l0 + 2);
if (memcmp (a.buf1, "aabcEDXZY", 10))
FAIL ();
#endif
#if __USE_FORTIFY_LEVEL >= 1
/* Now check if all buffer overflows are caught at runtime. */
CHK_FAIL_START
memcpy (buf + 1, "abcdefghij", l0 + 10);
CHK_FAIL_END
CHK_FAIL_START
memmove (buf + 2, buf + 1, l0 + 9);
CHK_FAIL_END
CHK_FAIL_START
p = mempcpy (buf + 6, "abcde", l0 + 5);
CHK_FAIL_END
CHK_FAIL_START
memset (buf + 9, 'j', l0 + 2);
CHK_FAIL_END
CHK_FAIL_START
strcpy (buf + 5, str1 + 5);
CHK_FAIL_END
CHK_FAIL_START
p = stpcpy (buf + 9, str2);
CHK_FAIL_END
CHK_FAIL_START
strncpy (buf + 7, "X", l0 + 4);
CHK_FAIL_END
CHK_FAIL_START
sprintf (buf + 8, "%d", num1);
CHK_FAIL_END
CHK_FAIL_START
snprintf (buf + 8, l0 + 3, "%d", num2);
CHK_FAIL_END
memcpy (buf, str1 + 2, l0 + 9);
CHK_FAIL_START
strcat (buf, "AB");
CHK_FAIL_END
memcpy (buf, str1 + 3, l0 + 8);
CHK_FAIL_START
strncat (buf, "ZYXWV", l0 + 3);
CHK_FAIL_END
CHK_FAIL_START
memcpy (a.buf1 + 1, "abcdefghij", l0 + 10);
CHK_FAIL_END
CHK_FAIL_START
memmove (a.buf1 + 2, a.buf1 + 1, l0 + 9);
CHK_FAIL_END
CHK_FAIL_START
p = mempcpy (a.buf1 + 6, "abcde", l0 + 5);
CHK_FAIL_END
CHK_FAIL_START
memset (a.buf1 + 9, 'j', l0 + 2);
CHK_FAIL_END
#if __USE_FORTIFY_LEVEL >= 2
# define O 0
#else
# define O 1
#endif
CHK_FAIL_START
strcpy (a.buf1 + (O + 4), str1 + 5);
CHK_FAIL_END
CHK_FAIL_START
p = stpcpy (a.buf1 + (O + 8), str2);
CHK_FAIL_END
CHK_FAIL_START
strncpy (a.buf1 + (O + 6), "X", l0 + 4);
CHK_FAIL_END
CHK_FAIL_START
sprintf (a.buf1 + (O + 7), "%d", num1);
CHK_FAIL_END
CHK_FAIL_START
snprintf (a.buf1 + (O + 7), l0 + 3, "%d", num2);
CHK_FAIL_END
memcpy (a.buf1, str1 + (3 - O), l0 + 8 + O);
CHK_FAIL_START
strcat (a.buf1, "AB");
CHK_FAIL_END
memcpy (a.buf1, str1 + (4 - O), l0 + 7 + O);
CHK_FAIL_START
strncat (a.buf1, "ZYXWV", l0 + 3);
CHK_FAIL_END
#endif
/* Now checks for %n protection. */
/* Constant literals passed directly are always ok
(even with warnings about possible bugs from GCC). */
int n1, n2;
if (sprintf (buf, "%s%n%s%n", str2, &n1, str2, &n2) != 2
|| n1 != 1 || n2 != 2)
FAIL ();
/* In this case the format string is not known at compile time,
but resides in read-only memory, so is ok. */
if (snprintf (buf, 4, str3, str2, &n1, str2, &n2) != 2
|| n1 != 1 || n2 != 2)
FAIL ();
strcpy (buf2 + 2, "%n%s%n");
/* When the format string is writable and contains %n,
with -D_FORTIFY_SOURCE=2 it causes __chk_fail. */
CHK_FAIL2_START
if (sprintf (buf, buf2, str2, &n1, str2, &n1) != 2)
FAIL ();
CHK_FAIL2_END
CHK_FAIL2_START
if (snprintf (buf, 3, buf2, str2, &n1, str2, &n1) != 2)
FAIL ();
CHK_FAIL2_END
/* But if there is no %n, even writable format string
should work. */
buf2[6] = '\0';
if (sprintf (buf, buf2 + 4, str2) != 1)
FAIL ();
/* Constant literals passed directly are always ok
(even with warnings about possible bugs from GCC). */
if (printf ("%s%n%s%n", str4, &n1, str5, &n2) != 14
|| n1 != 7 || n2 != 14)
FAIL ();
/* In this case the format string is not known at compile time,
but resides in read-only memory, so is ok. */
if (printf (str3, str4, &n1, str5, &n2) != 14
|| n1 != 7 || n2 != 14)
FAIL ();
strcpy (buf2 + 2, "%n%s%n");
/* When the format string is writable and contains %n,
with -D_FORTIFY_SOURCE=2 it causes __chk_fail. */
CHK_FAIL2_START
if (printf (buf2, str4, &n1, str5, &n1) != 14)
FAIL ();
CHK_FAIL2_END
/* But if there is no %n, even writable format string
should work. */
buf2[6] = '\0';
if (printf (buf2 + 4, str5) != 7)
FAIL ();
FILE *fp = stdout;
/* Constant literals passed directly are always ok
(even with warnings about possible bugs from GCC). */
if (fprintf (fp, "%s%n%s%n", str4, &n1, str5, &n2) != 14
|| n1 != 7 || n2 != 14)
FAIL ();
/* In this case the format string is not known at compile time,
but resides in read-only memory, so is ok. */
if (fprintf (fp, str3, str4, &n1, str5, &n2) != 14
|| n1 != 7 || n2 != 14)
FAIL ();
strcpy (buf2 + 2, "%n%s%n");
/* When the format string is writable and contains %n,
with -D_FORTIFY_SOURCE=2 it causes __chk_fail. */
CHK_FAIL2_START
if (fprintf (fp, buf2, str4, &n1, str5, &n1) != 14)
FAIL ();
CHK_FAIL2_END
/* But if there is no %n, even writable format string
should work. */
buf2[6] = '\0';
if (fprintf (fp, buf2 + 4, str5) != 7)
FAIL ();
if (freopen (temp_filename, "r", stdin) == NULL)
{
puts ("could not open temporary file");
exit (1);
}
if (gets (buf) != buf || memcmp (buf, "abcdefgh", 9))
FAIL ();
if (gets (buf) != buf || memcmp (buf, "ABCDEFGHI", 10))
FAIL ();
#if __USE_FORTIFY_LEVEL >= 1
CHK_FAIL_START
if (gets (buf) != buf)
FAIL ();
CHK_FAIL_END
#endif
if (freopen (temp_filename, "r", stdin) == NULL)
{
puts ("could not open temporary file");
exit (1);
}
if (fseek (stdin, 9 + 10 + 11, SEEK_SET))
{
puts ("could not seek in test file");
exit (1);
}
#if __USE_FORTIFY_LEVEL >= 1
CHK_FAIL_START
if (gets (buf) != buf)
FAIL ();
CHK_FAIL_END
#endif
return ret;
}
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