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Message-Id: <20230328161845.9584-2-w@1wt.eu>
Date: Tue, 28 Mar 2023 18:18:45 +0200
From: Willy Tarreau <w@....eu>
To: "Paul E. McKenney" <paulmck@...nel.org>
Cc: linux@...ssschuh.net, linux-kernel@...r.kernel.org,
Alexey Dobriyan <adobriyan@...il.com>, Willy Tarreau <w@....eu>
Subject: [PATCH 1/1] tools/nolibc: tests: use volatile to force stack smashing
From: Thomas Weißschuh <linux@...ssschuh.net>
Use a volatile pointer to write outside the buffer so the compiler can't
optimize it away.
Reported-by: Alexey Dobriyan <adobriyan@...il.com>
Link: https://lore.kernel.org/lkml/c0584807-511c-4496-b062-1263ea38f349@p183/
Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
Signed-off-by: Willy Tarreau <w@....eu>
---
tools/testing/selftests/nolibc/nolibc-test.c | 8 ++------
1 file changed, 2 insertions(+), 6 deletions(-)
diff --git a/tools/testing/selftests/nolibc/nolibc-test.c b/tools/testing/selftests/nolibc/nolibc-test.c
index 21bacc928bf7..47013b78972e 100644
--- a/tools/testing/selftests/nolibc/nolibc-test.c
+++ b/tools/testing/selftests/nolibc/nolibc-test.c
@@ -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;
}
--
2.17.5
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