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String: test-memcpy used unaligned types for buffers [BZ 28572]

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commit d585ba47fc
Author: Noah Goldstein <goldstein.w.n@gmail.com>
Date:   Mon Nov 1 00:49:48 2021 -0500

    string: Make tests birdirectional test-memcpy.c

Add tests that had src/dst non 4-byte aligned. Since src/dst are
initialized/compared as uint32_t type which is 4-byte aligned this can
break on some targets.

Fix the issue by specifying a new non-aligned 4-byte
`unaligned_uint32_t` for src/dst.

Another alternative is to rely on memcpy/memcmp for
initializing/testing src/dst. Using memcpy for initializing in memcpy
tests, however, could lead to future bugs.

Reviewed-by: Noah Goldstein <goldstein.w.n@gmail.com>
This commit is contained in:
John David Anglin 2021-12-07 16:10:20 -06:00 committed by Noah Goldstein
parent cbab7f7268
commit 409a735816
1 changed files with 3 additions and 2 deletions
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5
string/test-memcpy-support.h
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@ -51,6 +51,7 @@ builtin_memcpy (char *dst, const char *src, size_t n)
}
#endif
typedef char *(*proto_t) (char *, const char *, size_t);
typedef uint32_t __attribute__ ((may_alias, aligned (1))) unaligned_uint32_t;
static void
do_one_test (impl_t *impl, char *dst, const char *src, size_t len)
@ -134,8 +135,8 @@ do_test1 (size_t align1, size_t align2, size_t size)
error (EXIT_FAILURE, errno, "mprotect failed");
size_t array_size = size / sizeof (uint32_t);
uint32_t *dest = large_buf + align1;
uint32_t *src = large_buf + region_size + 2 * page_size + align2;
unaligned_uint32_t *dest = large_buf + align1;
unaligned_uint32_t *src = large_buf + region_size + 2 * page_size + align2;
size_t i;
size_t repeats;
for (repeats = 0; repeats < 2; repeats++)