Messages in this thread | | | Date | Wed, 2 Nov 2022 10:26:40 +0100 | Subject | Re: [PATCH 4/6] string: Add __realloc_size hint to kmemdup() | From | Rasmus Villemoes <> |
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On 01/11/2022 23.33, Kees Cook wrote: > Add __realloc_size() hint to kmemdup() so the compiler can reason about > the length of the returned buffer. (These must not use __alloc_size, > since those include __malloc which says the contents aren't defined[1]). > > [1] https://lore.kernel.org/linux-hardening/d199c2af-06af-8a50-a6a1-00eefa0b67b4@prevas.dk/ >
> extern char *kstrndup(const char *s, size_t len, gfp_t gfp); > -extern void *kmemdup(const void *src, size_t len, gfp_t gfp) __alloc_size(2); > +extern void *kmemdup(const void *src, size_t len, gfp_t gfp) __realloc_size(2);
What tree is this based on? I see that kmemdup() has grown that bogus __alloc_size in next-20221101, but in next-20221102 this commit seems to DTRT, namely
-extern void *kmemdup(const void *src, size_t len, gfp_t gfp); +extern void *kmemdup(const void *src, size_t len, gfp_t gfp) __realloc_size(2);
(i.e. there should never be an intermediate commit where kmemdup has __alloc_size()).
Rasmus
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