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Uninitialized read: make the pointer non-volatile rather than the buffer

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Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2023-11-10 11:35:36 +01:00
parent da6e7a2ac2
commit ccb121500d
1 changed files with 4 additions and 3 deletions
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7
programs/test/metatest.c
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@ -96,12 +96,13 @@ void double_free(const char *name)
void read_uninitialized_stack(const char *name) void read_uninitialized_stack(const char *name)
{ {
(void) name; (void) name;
volatile char buf[1]; char buf[1];
if (false_but_the_compiler_does_not_know) { if (false_but_the_compiler_does_not_know) {
buf[0] = '!'; buf[0] = '!';
} }
if (*buf != 0) { char *volatile p = buf;
mbedtls_printf("%u\n", (unsigned) *buf); if (*p != 0) {
mbedtls_printf("%u\n", (unsigned) *p);
} }
} }