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test-strnlen.c: Check that strnlen won't go beyond the maximum length

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Place strings ending at page boundary without the null byte.  If an
implementation goes beyond EXP_LEN, it will trigger the segfault.

(cherry picked from commit cb882b21b6)
This commit is contained in:
H.J. Lu 2021-03-27 09:06:39 -07:00
parent 927bcaf892
commit 66ca40582e
1 changed files with 30 additions and 0 deletions
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30
string/test-strnlen.c
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@ -198,6 +198,35 @@ do_page_tests (void)
}
}
/* Tests meant to unveil fail on implementations that access bytes
beyond the maxium length. */
static void
do_page_2_tests (void)
{
size_t i, exp_len, offset;
size_t last_offset = page_size / sizeof (CHAR);
CHAR *s = (CHAR *) buf2;
MEMSET (s, 65, last_offset);
/* Place short strings ending at page boundary without the null
byte. */
offset = last_offset;
for (i = 0; i < 128; i++)
{
/* Decrease offset to stress several sizes and alignments. */
offset--;
exp_len = last_offset - offset;
FOR_EACH_IMPL (impl, 0)
{
/* If an implementation goes beyond EXP_LEN, it will trigger
the segfault. */
do_one_test (impl, (CHAR *) (s + offset), exp_len, exp_len);
}
}
}
int
test_main (void)
{
@ -244,6 +273,7 @@ test_main (void)
do_random_tests ();
do_page_tests ();
do_page_2_tests ();
return ret;
}