[PATCH 3/5] mm/page_alloc: Add __alloc_size attributes for better bounds checking
From: Kees Cook <hidden>
Date: 2021-08-18 05:09:00
Also in:
linux-hardening, linux-kbuild, lkml
Subsystem:
memory management - core, memory management - page allocator, the rest · Maintainers:
Andrew Morton, David Hildenbrand, Vlastimil Babka, Linus Torvalds
As already done in GrapheneOS, add the __alloc_size attribute for appropriate page allocator interfaces, to provide additional hinting for better bounds checking, assisting CONFIG_FORTIFY_SOURCE and other compiler optimizations. Co-developed-by: Daniel Micay <redacted> Signed-off-by: Daniel Micay <redacted> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: linux-mm@kvack.org Signed-off-by: Kees Cook <redacted> --- include/linux/gfp.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index 3745efd21cf6..94e57c752308 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h@@ -618,9 +618,9 @@ static inline struct folio *folio_alloc(gfp_t gfp, unsigned int order) extern unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order); extern unsigned long get_zeroed_page(gfp_t gfp_mask); -void *alloc_pages_exact(size_t size, gfp_t gfp_mask); +void *alloc_pages_exact(size_t size, gfp_t gfp_mask) __alloc_size(1); void free_pages_exact(void *virt, size_t size); -void * __meminit alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask); +void * __meminit alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask) __alloc_size(1); #define __get_free_page(gfp_mask) \ __get_free_pages((gfp_mask), 0)
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2.30.2