string: Improve coverage in test-strcmp.c and test-strncmp.c

Add additional test cases for small / medium sizes.

Add tests in test-strncmp.c where `n` is near ULONG_MAX or LONG_MIN to
test for overflow bugs in length handling.

Signed-off-by: Noah Goldstein <goldstein.w.n@gmail.com>
This commit is contained in:
Noah Goldstein 2022-01-10 15:35:37 -06:00
parent 43388b3ac0
commit 1a908d9074
2 changed files with 306 additions and 21 deletions

View File

@ -16,6 +16,9 @@
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#define TEST_LEN (4096 * 3)
#define MIN_PAGE_SIZE (TEST_LEN + 2 * getpagesize ())
#define TEST_MAIN
#ifdef WIDE
# define TEST_NAME "wcscmp"
@ -129,7 +132,7 @@ do_one_test (impl_t *impl,
static void
do_test (size_t align1, size_t align2, size_t len, int max_char,
int exp_result)
int exp_result)
{
size_t i;
@ -138,19 +141,22 @@ do_test (size_t align1, size_t align2, size_t len, int max_char,
if (len == 0)
return;
align1 &= 63;
align1 &= ~(CHARBYTES - 1);
align2 &= ~(CHARBYTES - 1);
align1 &= getpagesize () - 1;
if (align1 + (len + 1) * CHARBYTES >= page_size)
return;
align2 &= 63;
align2 &= getpagesize () - 1;
if (align2 + (len + 1) * CHARBYTES >= page_size)
return;
/* Put them close to the end of page. */
i = align1 + CHARBYTES * (len + 2);
s1 = (CHAR *) (buf1 + ((page_size - i) / 16 * 16) + align1);
s1 = (CHAR *)(buf1 + ((page_size - i) / 16 * 16) + align1);
i = align2 + CHARBYTES * (len + 2);
s2 = (CHAR *) (buf2 + ((page_size - i) / 16 * 16) + align2);
s2 = (CHAR *)(buf2 + ((page_size - i) / 16 * 16) + align2);
for (i = 0; i < len; i++)
s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % max_char;
@ -161,9 +167,10 @@ do_test (size_t align1, size_t align2, size_t len, int max_char,
s2[len - 1] -= exp_result;
FOR_EACH_IMPL (impl, 0)
do_one_test (impl, s1, s2, exp_result);
do_one_test (impl, s1, s2, exp_result);
}
static void
do_random_tests (void)
{
@ -385,7 +392,7 @@ check3 (void)
int
test_main (void)
{
size_t i;
size_t i, j;
test_init ();
check();
@ -426,6 +433,55 @@ test_main (void)
do_test (2 * CHARBYTES * i, CHARBYTES * i, 8 << i, LARGECHAR, -1);
}
for (j = 0; j < 160; ++j)
{
for (i = 0; i < TEST_LEN;)
{
do_test (getpagesize () - j - 1, 0, i, 127, 0);
do_test (getpagesize () - j - 1, 0, i, 127, 1);
do_test (getpagesize () - j - 1, 0, i, 127, -1);
do_test (getpagesize () - j - 1, j, i, 127, 0);
do_test (getpagesize () - j - 1, j, i, 127, 1);
do_test (getpagesize () - j - 1, j, i, 127, -1);
do_test (0, getpagesize () - j - 1, i, 127, 0);
do_test (0, getpagesize () - j - 1, i, 127, 1);
do_test (0, getpagesize () - j - 1, i, 127, -1);
do_test (j, getpagesize () - j - 1, i, 127, 0);
do_test (j, getpagesize () - j - 1, i, 127, 1);
do_test (j, getpagesize () - j - 1, i, 127, -1);
if (i < 32)
{
i += 1;
}
else if (i < 161)
{
i += 7;
}
else if (i + 161 < TEST_LEN)
{
i += 31;
i *= 17;
i /= 16;
if (i + 161 > TEST_LEN)
{
i = TEST_LEN - 160;
}
}
else if (i + 32 < TEST_LEN)
{
i += 7;
}
else
{
i += 1;
}
}
}
do_random_tests ();
return ret;
}

View File

@ -16,6 +16,9 @@
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#define TEST_LEN (4096 * 3)
#define MIN_PAGE_SIZE (TEST_LEN + 2 * getpagesize ())
#define TEST_MAIN
#ifdef WIDE
# define TEST_NAME "wcsncmp"
@ -166,11 +169,11 @@ do_test_limit (size_t align1, size_t align2, size_t len, size_t n, int max_char,
}
static void
do_test (size_t align1, size_t align2, size_t len, size_t n, int max_char,
int exp_result)
do_test_n (size_t align1, size_t align2, size_t len, size_t n, int n_in_bounds,
int max_char, int exp_result)
{
size_t i;
CHAR *s1, *s2;
size_t i, buf_bound;
CHAR *s1, *s2, *s1_end, *s2_end;
align1 &= ~(CHARBYTES - 1);
align2 &= ~(CHARBYTES - 1);
@ -178,22 +181,28 @@ do_test (size_t align1, size_t align2, size_t len, size_t n, int max_char,
if (n == 0)
return;
align1 &= 63;
if (align1 + (n + 1) * CHARBYTES >= page_size)
buf_bound = n_in_bounds ? n : len;
align1 &= getpagesize () - 1;
if (align1 + (buf_bound + 2) * CHARBYTES >= page_size)
return;
align2 &= 63;
if (align2 + (n + 1) * CHARBYTES >= page_size)
align2 &= getpagesize () - 1;
if (align2 + (buf_bound + 2) * CHARBYTES >= page_size)
return;
s1 = (CHAR *) (buf1 + align1);
s2 = (CHAR *) (buf2 + align2);
s1 = (CHAR *)(buf1 + align1);
s2 = (CHAR *)(buf2 + align2);
for (i = 0; i < n; i++)
if (n_in_bounds)
{
s1[n] = 24 + exp_result;
s2[n] = 23;
}
for (i = 0; i < buf_bound; i++)
s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % max_char;
s1[n] = 24 + exp_result;
s2[n] = 23;
s1[len] = 0;
s2[len] = 0;
if (exp_result < 0)
@ -203,10 +212,24 @@ do_test (size_t align1, size_t align2, size_t len, size_t n, int max_char,
if (len >= n)
s2[n - 1] -= exp_result;
/* Ensure that both s1 and s2 are valid null terminated strings. This is
* required by the standard. */
s1_end = (CHAR *)(buf1 + MIN_PAGE_SIZE - CHARBYTES);
s2_end = (CHAR *)(buf2 + MIN_PAGE_SIZE - CHARBYTES);
*s1_end = 0;
*s2_end = 0;
FOR_EACH_IMPL (impl, 0)
do_one_test (impl, s1, s2, n, exp_result);
}
static void
do_test (size_t align1, size_t align2, size_t len, size_t n, int max_char,
int exp_result)
{
do_test_n (align1, align2, len, n, 1, max_char, exp_result);
}
static void
do_page_test (size_t offset1, size_t offset2, CHAR *s2)
{
@ -400,10 +423,123 @@ check3 (void)
}
}
static void
check_overflow (void)
{
size_t i, j, of_mask, of_idx;
const size_t of_masks[]
= { ULONG_MAX, LONG_MIN, ULONG_MAX - (ULONG_MAX >> 2),
((size_t)LONG_MAX) >> 1 };
for (of_idx = 0; of_idx < sizeof (of_masks) / sizeof (of_masks[0]); ++of_idx)
{
of_mask = of_masks[of_idx];
for (j = 0; j < 160; ++j)
{
for (i = 1; i <= 161; i += (32 / sizeof (CHAR)))
{
do_test_n (j, 0, i, of_mask, 0, 127, 0);
do_test_n (j, 0, i, of_mask, 0, 127, 1);
do_test_n (j, 0, i, of_mask, 0, 127, -1);
do_test_n (j, 0, i, of_mask - j / 2, 0, 127, 0);
do_test_n (j, 0, i, of_mask - j * 2, 0, 127, 1);
do_test_n (j, 0, i, of_mask - j, 0, 127, -1);
do_test_n (j / 2, j, i, of_mask, 0, 127, 0);
do_test_n (j / 2, j, i, of_mask, 0, 127, 1);
do_test_n (j / 2, j, i, of_mask, 0, 127, -1);
do_test_n (j / 2, j, i, of_mask - j, 0, 127, 0);
do_test_n (j / 2, j, i, of_mask - j / 2, 0, 127, 1);
do_test_n (j / 2, j, i, of_mask - j * 2, 0, 127, -1);
do_test_n (0, j, i, of_mask - j * 2, 0, 127, 0);
do_test_n (0, j, i, of_mask - j, 0, 127, 1);
do_test_n (0, j, i, of_mask - j / 2, 0, 127, -1);
do_test_n (getpagesize () - j - 1, 0, i, of_mask, 0, 127, 0);
do_test_n (getpagesize () - j - 1, 0, i, of_mask, 0, 127, 1);
do_test_n (getpagesize () - j - 1, 0, i, of_mask, 0, 127, -1);
do_test_n (getpagesize () - j - 1, 0, i, of_mask - j / 2, 0, 127,
0);
do_test_n (getpagesize () - j - 1, 0, i, of_mask - j * 2, 0, 127,
1);
do_test_n (getpagesize () - j - 1, 0, i, of_mask - j, 0, 127,
-1);
do_test_n (getpagesize () - j - 1, getpagesize () - 2 * j - 1, i,
of_mask, 0, 127, 0);
do_test_n (getpagesize () - j - 1, getpagesize () - 2 * j - 1, i,
of_mask, 0, 127, 1);
do_test_n (getpagesize () - j - 1, getpagesize () - 2 * j - 1, i,
of_mask, 0, 127, -1);
do_test_n (getpagesize () - j - 1, getpagesize () - 2 * j - 1, i,
of_mask - j, 0, 127, 0);
do_test_n (getpagesize () - j - 1, getpagesize () - 2 * j - 1, i,
of_mask - j / 2, 0, 127, 1);
do_test_n (getpagesize () - j - 1, getpagesize () - 2 * j - 1, i,
of_mask - j * 2, 0, 127, -1);
}
for (i = 1; i < TEST_LEN; i += i)
{
do_test_n (j, 0, i - 1, of_mask, 0, 127, 0);
do_test_n (j, 0, i - 1, of_mask, 0, 127, 1);
do_test_n (j, 0, i - 1, of_mask, 0, 127, -1);
do_test_n (j, 0, i - 1, of_mask - j / 2, 0, 127, 0);
do_test_n (j, 0, i - 1, of_mask - j * 2, 0, 127, 1);
do_test_n (j, 0, i - 1, of_mask - j, 0, 127, -1);
do_test_n (j / 2, j, i - 1, of_mask, 0, 127, 0);
do_test_n (j / 2, j, i - 1, of_mask, 0, 127, 1);
do_test_n (j / 2, j, i - 1, of_mask, 0, 127, -1);
do_test_n (j / 2, j, i - 1, of_mask - j, 0, 127, 0);
do_test_n (j / 2, j, i - 1, of_mask - j / 2, 0, 127, 1);
do_test_n (j / 2, j, i - 1, of_mask - j * 2, 0, 127, -1);
do_test_n (0, j, i - 1, of_mask - j * 2, 0, 127, 0);
do_test_n (0, j, i - 1, of_mask - j, 0, 127, 1);
do_test_n (0, j, i - 1, of_mask - j / 2, 0, 127, -1);
do_test_n (getpagesize () - j - 1, 0, i - 1, of_mask, 0, 127, 0);
do_test_n (getpagesize () - j - 1, 0, i - 1, of_mask, 0, 127, 1);
do_test_n (getpagesize () - j - 1, 0, i - 1, of_mask, 0, 127,
-1);
do_test_n (getpagesize () - j - 1, 0, i - 1, of_mask - j / 2, 0,
127, 0);
do_test_n (getpagesize () - j - 1, 0, i - 1, of_mask - j * 2, 0,
127, 1);
do_test_n (getpagesize () - j - 1, 0, i - 1, of_mask - j, 0, 127,
-1);
do_test_n (getpagesize () - j - 1, getpagesize () - 2 * j - 1,
i - 1, of_mask, 0, 127, 0);
do_test_n (getpagesize () - j - 1, getpagesize () - 2 * j - 1,
i - 1, of_mask, 0, 127, 1);
do_test_n (getpagesize () - j - 1, getpagesize () - 2 * j - 1,
i - 1, of_mask, 0, 127, -1);
do_test_n (getpagesize () - j - 1, getpagesize () - 2 * j - 1,
i - 1, of_mask - j, 0, 127, 0);
do_test_n (getpagesize () - j - 1, getpagesize () - 2 * j - 1,
i - 1, of_mask - j / 2, 0, 127, 1);
do_test_n (getpagesize () - j - 1, getpagesize () - 2 * j - 1,
i - 1, of_mask - j * 2, 0, 127, -1);
}
}
}
}
int
test_main (void)
{
size_t i;
size_t i, j;
test_init ();
@ -470,6 +606,99 @@ test_main (void)
do_test_limit (0, 0, 15 - i, 16 - i, 255, -1);
}
for (j = 0; j < 160; ++j)
{
for (i = 0; i < TEST_LEN;)
{
do_test_n (getpagesize () - j - 1, 0, i, i + 1, 0, 127, 0);
do_test_n (getpagesize () - j - 1, 0, i, i + 1, 0, 127, 1);
do_test_n (getpagesize () - j - 1, 0, i, i + 1, 0, 127, -1);
do_test_n (getpagesize () - j - 1, 0, i, i, 0, 127, 0);
do_test_n (getpagesize () - j - 1, 0, i, i - 1, 0, 127, 0);
do_test_n (getpagesize () - j - 1, 0, i, ULONG_MAX, 0, 127, 0);
do_test_n (getpagesize () - j - 1, 0, i, ULONG_MAX, 0, 127, 1);
do_test_n (getpagesize () - j - 1, 0, i, ULONG_MAX, 0, 127, -1);
do_test_n (getpagesize () - j - 1, 0, i, ULONG_MAX - i, 0, 127, 0);
do_test_n (getpagesize () - j - 1, 0, i, ULONG_MAX - i, 0, 127, 1);
do_test_n (getpagesize () - j - 1, 0, i, ULONG_MAX - i, 0, 127, -1);
do_test_n (getpagesize () - j - 1, j, i, i + 1, 0, 127, 0);
do_test_n (getpagesize () - j - 1, j, i, i + 1, 0, 127, 1);
do_test_n (getpagesize () - j - 1, j, i, i + 1, 0, 127, -1);
do_test_n (getpagesize () - j - 1, j, i, i, 0, 127, 0);
do_test_n (getpagesize () - j - 1, j, i, i - 1, 0, 127, 0);
do_test_n (getpagesize () - j - 1, j, i, ULONG_MAX, 0, 127, 0);
do_test_n (getpagesize () - j - 1, j, i, ULONG_MAX, 0, 127, 1);
do_test_n (getpagesize () - j - 1, j, i, ULONG_MAX, 0, 127, -1);
do_test_n (getpagesize () - j - 1, j, i, ULONG_MAX - i, 0, 127, 0);
do_test_n (getpagesize () - j - 1, j, i, ULONG_MAX - i, 0, 127, 1);
do_test_n (getpagesize () - j - 1, j, i, ULONG_MAX - i, 0, 127, -1);
do_test_n (0, getpagesize () - j - 1, i, i + 1, 0, 127, 0);
do_test_n (0, getpagesize () - j - 1, i, i + 1, 0, 127, 1);
do_test_n (0, getpagesize () - j - 1, i, i + 1, 0, 127, -1);
do_test_n (0, getpagesize () - j - 1, i, i, 0, 127, 0);
do_test_n (0, getpagesize () - j - 1, i, i - 1, 0, 127, 0);
do_test_n (0, getpagesize () - j - 1, i, ULONG_MAX, 0, 127, 0);
do_test_n (0, getpagesize () - j - 1, i, ULONG_MAX, 0, 127, 1);
do_test_n (0, getpagesize () - j - 1, i, ULONG_MAX, 0, 127, -1);
do_test_n (0, getpagesize () - j - 1, i, ULONG_MAX - i, 0, 127, 0);
do_test_n (0, getpagesize () - j - 1, i, ULONG_MAX - i, 0, 127, 1);
do_test_n (0, getpagesize () - j - 1, i, ULONG_MAX - i, 0, 127, -1);
do_test_n (j, getpagesize () - j - 1, i, i + 1, 0, 127, 0);
do_test_n (j, getpagesize () - j - 1, i, i + 1, 0, 127, 1);
do_test_n (j, getpagesize () - j - 1, i, i + 1, 0, 127, -1);
do_test_n (j, getpagesize () - j - 1, i, i, 0, 127, 0);
do_test_n (j, getpagesize () - j - 1, i, i - 1, 0, 127, 0);
do_test_n (j, getpagesize () - j - 1, i, ULONG_MAX, 0, 127, 0);
do_test_n (j, getpagesize () - j - 1, i, ULONG_MAX, 0, 127, 1);
do_test_n (j, getpagesize () - j - 1, i, ULONG_MAX, 0, 127, -1);
do_test_n (j, getpagesize () - j - 1, i, ULONG_MAX - i, 0, 127, 0);
do_test_n (j, getpagesize () - j - 1, i, ULONG_MAX - i, 0, 127, 1);
do_test_n (j, getpagesize () - j - 1, i, ULONG_MAX - i, 0, 127, -1);
if (i < 32)
{
i += 1;
}
else if (i < 161)
{
i += 7;
}
else if (i + 161 < TEST_LEN)
{
i += 31;
i *= 17;
i /= 16;
if (i + 161 > TEST_LEN)
{
i = TEST_LEN - 160;
}
}
else if (i + 32 < TEST_LEN)
{
i += 7;
}
else
{
i += 1;
}
}
}
check_overflow ();
do_random_tests ();
return ret;
}