diff options
Diffstat (limited to 'string')
-rw-r--r-- | string/test-memcmp.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/string/test-memcmp.c b/string/test-memcmp.c index b30e34d0e4..0420cd0b7b 100644 --- a/string/test-memcmp.c +++ b/string/test-memcmp.c @@ -448,6 +448,29 @@ check1 (void) } } +/* This test checks that memcmp doesn't overrun buffers. */ +static void +check2 (void) +{ + size_t max_length = page_size / sizeof (CHAR); + + /* Initialize buf2 to the same values as buf1. The bug requires the + last compared byte to be different. */ + memcpy (buf2, buf1, page_size); + ((char *) buf2)[page_size - 1] ^= 0x11; + + for (size_t length = 1; length < max_length; length++) + { + CHAR *s1 = (CHAR *) buf1 + max_length - length; + CHAR *s2 = (CHAR *) buf2 + max_length - length; + + const int exp_result = SIMPLE_MEMCMP (s1, s2, length); + + FOR_EACH_IMPL (impl, 0) + check_result (impl, s1, s2, length, exp_result); + } +} + int test_main (void) { @@ -456,6 +479,7 @@ test_main (void) test_init (); check1 (); + check2 (); printf ("%23s", ""); FOR_EACH_IMPL (impl, 0) |