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Strengthen against Clang optimizations

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Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2023-11-02 19:52:32 +01:00
parent b0f0a64de0
commit 69e8db0366
1 changed files with 15 additions and 9 deletions
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24
programs/test/metatest.c
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@ -11,12 +11,21 @@
#define MBEDTLS_ALLOW_PRIVATE_ACCESS #define MBEDTLS_ALLOW_PRIVATE_ACCESS
#include <mbedtls/platform.h> #include <mbedtls/platform.h>
#include <mbedtls/platform_util.h>
#include "test/helpers.h" #include "test/helpers.h"
#include <stdio.h> #include <stdio.h>
#include <string.h> #include <string.h>
/* This is an external variable, so the compiler doesn't know that we're never
* changing its value.
*
* TODO: LTO (link-time-optimization) would defeat this.
*/
int false_but_the_compiler_does_not_know = 0;
/****************************************************************/ /****************************************************************/
/* Test framework features */ /* Test framework features */
/****************************************************************/ /****************************************************************/
@ -35,19 +44,17 @@ void meta_test_fail(const char *name)
void null_pointer_dereference(const char *name) void null_pointer_dereference(const char *name)
{ {
(void) name; (void) name;
char *p; volatile char *p;
memset(&p, 0, sizeof(p)); mbedtls_platform_zeroize(&p, sizeof(p));
volatile char c; mbedtls_printf("%p -> %u\n", p, (unsigned) *p);
c = *p;
(void) c;
} }
void null_pointer_call(const char *name) void null_pointer_call(const char *name)
{ {
(void) name; (void) name;
void (*p)(void); unsigned (*p)(void);
memset(&p, 0, sizeof(p)); mbedtls_platform_zeroize(&p, sizeof(p));
p(); mbedtls_printf("%p() -> %u\n", p, p());
} }
@ -77,7 +84,6 @@ void read_uninitialized_stack(const char *name)
{ {
(void) name; (void) name;
volatile char buf[1]; volatile char buf[1];
static int false_but_the_compiler_does_not_know = 0;
if (false_but_the_compiler_does_not_know) { if (false_but_the_compiler_does_not_know) {
buf[0] = '!'; buf[0] = '!';
} }