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Date:   Thu, 30 Sep 2021 15:27:03 -0700
From:   Kees Cook <>
To:     Andrew Morton <>
Cc:     Kees Cook <>,
        Andy Whitcroft <>,
        Christoph Lameter <>,
        David Rientjes <>,
        Dennis Zhou <>,
        Dwaipayan Ray <>,
        Joe Perches <>,
        Joonsoo Kim <>,
        Lukas Bulwahn <>,
        Miguel Ojeda <>,
        Nathan Chancellor <>,
        Nick Desaulniers <>,
        Pekka Enberg <>, Tejun Heo <>,
        Vlastimil Babka <>,
        Daniel Micay <>,
        Masahiro Yamada <>,
        Michal Marek <>,,,,,
Subject: [PATCH v3 7/8] mm/page_alloc: Add __alloc_size attributes for better bounds checking

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

Cc: Andy Whitcroft <>
Cc: Christoph Lameter <>
Cc: David Rientjes <>
Cc: Dennis Zhou <>
Cc: Dwaipayan Ray <>
Cc: Joe Perches <>
Cc: Joonsoo Kim <>
Cc: Lukas Bulwahn <>
Cc: Miguel Ojeda <>
Cc: Nathan Chancellor <>
Cc: Nick Desaulniers <>
Cc: Pekka Enberg <>
Cc: Tejun Heo <>
Cc: Vlastimil Babka <>
Co-developed-by: Daniel Micay <>
Signed-off-by: Daniel Micay <>
Signed-off-by: Kees Cook <>
 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 55b2ec1f965a..fbd4abc33f24 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -608,9 +608,9 @@ static inline struct page *alloc_pages(gfp_t gfp_mask, 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);
+__meminit void *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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