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String: Add overflow tests for strnlen, memchr, and strncat [BZ #27974]

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This commit adds tests for a bug in the wide char variant of the
functions where the implementation may assume that maxlen for wcsnlen
or n for wmemchr/strncat will not overflow when multiplied by
sizeof(wchar_t).

These tests show the following implementations failing on x86_64:

wcsnlen-sse4_1
wcsnlen-avx2

wmemchr-sse2
wmemchr-avx2

strncat would fail as well if it where on a system that prefered
either of the wcsnlen implementations that failed as it relies on
wcsnlen.

Signed-off-by: Noah Goldstein <goldstein.w.n@gmail.com>
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
This commit is contained in:
Noah Goldstein 2021-06-09 16:17:14 -04:00
parent 6f573a27b6
commit da5a6fba0f
3 changed files with 130 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

39
string/test-memchr.c
View File

@ -65,8 +65,8 @@ do_one_test (impl_t *impl, const CHAR *s, int c, size_t n, CHAR *exp_res)
CHAR *res = CALL (impl, s, c, n);
if (res != exp_res)
{
error (0, 0, "Wrong result in function %s %p %p", impl->name,
res, exp_res);
error (0, 0, "Wrong result in function %s (%p, %d, %zu) -> %p != %p",
impl->name, s, c, n, res, exp_res);
ret = 1;
return;
}
@ -91,7 +91,7 @@ do_test (size_t align, size_t pos, size_t len, size_t n, int seek_char)
}
buf[align + len] = 0;
if (pos < len)
if (pos < MIN(n, len))
{
buf[align + pos] = seek_char;
buf[align + len] = -seek_char;
@ -107,6 +107,38 @@ do_test (size_t align, size_t pos, size_t len, size_t n, int seek_char)
do_one_test (impl, (CHAR *) (buf + align), seek_char, n, result);
}
static void
do_overflow_tests (void)
{
size_t i, j, len;
const size_t one = 1;
uintptr_t buf_addr = (uintptr_t) buf1;
for (i = 0; i < 750; ++i)
{
do_test (0, i, 751, SIZE_MAX - i, BIG_CHAR);
do_test (0, i, 751, i - buf_addr, BIG_CHAR);
do_test (0, i, 751, -buf_addr - i, BIG_CHAR);
do_test (0, i, 751, SIZE_MAX - buf_addr - i, BIG_CHAR);
do_test (0, i, 751, SIZE_MAX - buf_addr + i, BIG_CHAR);
len = 0;
for (j = 8 * sizeof(size_t) - 1; j ; --j)
{
len |= one << j;
do_test (0, i, 751, len - i, BIG_CHAR);
do_test (0, i, 751, len + i, BIG_CHAR);
do_test (0, i, 751, len - buf_addr - i, BIG_CHAR);
do_test (0, i, 751, len - buf_addr + i, BIG_CHAR);
do_test (0, i, 751, ~len - i, BIG_CHAR);
do_test (0, i, 751, ~len + i, BIG_CHAR);
do_test (0, i, 751, ~len - buf_addr - i, BIG_CHAR);
do_test (0, i, 751, ~len - buf_addr + i, BIG_CHAR);
}
}
}
static void
do_random_tests (void)
{
@ -221,6 +253,7 @@ test_main (void)
do_test (page_size / 2 - i, i, i, 1, 0x9B);
do_random_tests ();
do_overflow_tests ();
return ret;
}

61
string/test-strncat.c
View File

@ -134,6 +134,66 @@ do_test (size_t align1, size_t align2, size_t len1, size_t len2,
}
}
static void
do_overflow_tests (void)
{
size_t i, j, len;
const size_t one = 1;
CHAR *s1, *s2;
uintptr_t s1_addr;
s1 = (CHAR *) buf1;
s2 = (CHAR *) buf2;
s1_addr = (uintptr_t)s1;
for (j = 0; j < 200; ++j)
s2[j] = 32 + 23 * j % (BIG_CHAR - 32);
s2[200] = 0;
for (i = 0; i < 750; ++i) {
for (j = 0; j < i; ++j)
s1[j] = 32 + 23 * j % (BIG_CHAR - 32);
s1[i] = '\0';
FOR_EACH_IMPL (impl, 0)
{
s2[200] = '\0';
do_one_test (impl, s2, s1, SIZE_MAX - i);
s2[200] = '\0';
do_one_test (impl, s2, s1, i - s1_addr);
s2[200] = '\0';
do_one_test (impl, s2, s1, -s1_addr - i);
s2[200] = '\0';
do_one_test (impl, s2, s1, SIZE_MAX - s1_addr - i);
s2[200] = '\0';
do_one_test (impl, s2, s1, SIZE_MAX - s1_addr + i);
}
len = 0;
for (j = 8 * sizeof(size_t) - 1; j ; --j)
{
len |= one << j;
FOR_EACH_IMPL (impl, 0)
{
s2[200] = '\0';
do_one_test (impl, s2, s1, len - i);
s2[200] = '\0';
do_one_test (impl, s2, s1, len + i);
s2[200] = '\0';
do_one_test (impl, s2, s1, len - s1_addr - i);
s2[200] = '\0';
do_one_test (impl, s2, s1, len - s1_addr + i);
s2[200] = '\0';
do_one_test (impl, s2, s1, ~len - i);
s2[200] = '\0';
do_one_test (impl, s2, s1, ~len + i);
s2[200] = '\0';
do_one_test (impl, s2, s1, ~len - s1_addr - i);
s2[200] = '\0';
do_one_test (impl, s2, s1, ~len - s1_addr + i);
}
}
}
}
static void
do_random_tests (void)
{
@ -316,6 +376,7 @@ test_main (void)
}
do_random_tests ();
do_overflow_tests ();
return ret;
}

33
string/test-strnlen.c
View File

@ -89,6 +89,38 @@ do_test (size_t align, size_t len, size_t maxlen, int max_char)
do_one_test (impl, (CHAR *) (buf + align), maxlen, MIN (len, maxlen));
}
static void
do_overflow_tests (void)
{
size_t i, j, len;
const size_t one = 1;
uintptr_t buf_addr = (uintptr_t) buf1;
for (i = 0; i < 750; ++i)
{
do_test (0, i, SIZE_MAX - i, BIG_CHAR);
do_test (0, i, i - buf_addr, BIG_CHAR);
do_test (0, i, -buf_addr - i, BIG_CHAR);
do_test (0, i, SIZE_MAX - buf_addr - i, BIG_CHAR);
do_test (0, i, SIZE_MAX - buf_addr + i, BIG_CHAR);
len = 0;
for (j = 8 * sizeof(size_t) - 1; j ; --j)
{
len |= one << j;
do_test (0, i, len - i, BIG_CHAR);
do_test (0, i, len + i, BIG_CHAR);
do_test (0, i, len - buf_addr - i, BIG_CHAR);
do_test (0, i, len - buf_addr + i, BIG_CHAR);
do_test (0, i, ~len - i, BIG_CHAR);
do_test (0, i, ~len + i, BIG_CHAR);
do_test (0, i, ~len - buf_addr - i, BIG_CHAR);
do_test (0, i, ~len - buf_addr + i, BIG_CHAR);
}
}
}
static void
do_random_tests (void)
{
@ -283,6 +315,7 @@ test_main (void)
do_random_tests ();
do_page_tests ();
do_page_2_tests ();
do_overflow_tests ();
return ret;
}