On Tue, Nov 21, 2023 at 11:06 PM Ilya Leoshkevich <iii@xxxxxxxxxxxxx> wrote:
>
> Add a wrapper for memset() that prevents unpoisoning.
We have __memset() already, won't it work for this case?
On the other hand, I am not sure you want to preserve the redzone in
its previous state (unless it's known to be poisoned).
You might consider explicitly unpoisoning the redzone instead.
...
> +__no_sanitize_memory
> +static inline void *memset_no_sanitize_memory(void *s, int c, size_t n)
> +{
> + return memset(s, c, n);
> +}
I think depending on the compiler optimizations this might end up
being a call to normal memset, that would still change the shadow
bytes.
