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https://github.com/GrapheneOS/hardened_malloc.git
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d757835d90
This was not working as expected due to CONFIG_EXTENDED_SIZE_CLASSES resulting in 128k being a slab allocation size class. The addition of padding for the canary pushes it into the next size class, resulting in this writing over size class rounding padding rather than this actually being an overflow as intended.
13 lines
199 B
C
13 lines
199 B
C
#include <stdlib.h>
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__attribute__((optimize(0)))
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int main(void) {
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char *p = malloc(256 * 1024);
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if (!p) {
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return 1;
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}
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*(p + 256 * 1024 + 7) = 0;
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free(p);
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return 0;
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}
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