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tools/nolibc: tests: use volatile to force stack smashing

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Use a volatile pointer to write outside the buffer so the compiler can't
optimize it away.

Reported-by: Alexey Dobriyan <adobriyan@gmail.com>
Link: https://lore.kernel.org/lkml/c0584807-511c-4496-b062-1263ea38f349@p183/
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Thomas Weißschuh 2023-03-28 18:18:45 +02:00 committed by Paul E. McKenney
parent ac9a78681b
commit e7654c3fbd
1 changed files with 2 additions and 6 deletions
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8
tools/testing/selftests/nolibc/nolibc-test.c
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@ -667,17 +667,13 @@ int run_stdlib(int min, int max)
return ret;
}
#if defined(__clang__)
__attribute__((optnone))
#elif defined(__GNUC__)
__attribute__((optimize("O0")))
#endif
static int smash_stack(void)
{
char buf[100];
volatile char *ptr = buf;
for (size_t i = 0; i < 200; i++)
buf[i] = 'P';
ptr[i] = 'P';
return 1;
}