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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
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61
string/test-strncat.c
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@ -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;
}