linux-kernel - [PATCH v3 5/8] mm/kvmalloc: Add __alloc_size attributes for better bounds checking

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Date:   Thu, 30 Sep 2021 15:27:01 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Kees Cook <keescook@...omium.org>,
        Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Andy Whitcroft <apw@...onical.com>,
        Dennis Zhou <dennis@...nel.org>,
        Dwaipayan Ray <dwaipayanray1@...il.com>,
        Joe Perches <joe@...ches.com>,
        Lukas Bulwahn <lukas.bulwahn@...il.com>,
        Miguel Ojeda <ojeda@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Tejun Heo <tj@...nel.org>,
        Daniel Micay <danielmicay@...il.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        clang-built-linux@...glegroups.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: [PATCH v3 5/8] mm/kvmalloc: Add __alloc_size attributes for better bounds checking

As already done in GrapheneOS, add the __alloc_size attribute for regular
kvmalloc interfaces, to provide additional hinting for better bounds
checking, assisting CONFIG_FORTIFY_SOURCE and other compiler
optimizations.

Cc: Christoph Lameter <cl@...ux.com>
Cc: Pekka Enberg <penberg@...nel.org>
Cc: David Rientjes <rientjes@...gle.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@....com>
Cc: Vlastimil Babka <vbabka@...e.cz>
Cc: Andy Whitcroft <apw@...onical.com>
Cc: Dennis Zhou <dennis@...nel.org>
Cc: Dwaipayan Ray <dwaipayanray1@...il.com>
Cc: Joe Perches <joe@...ches.com>
Cc: Lukas Bulwahn <lukas.bulwahn@...il.com>
Cc: Miguel Ojeda <ojeda@...nel.org>
Cc: Nathan Chancellor <nathan@...nel.org>
Cc: Tejun Heo <tj@...nel.org>
Co-developed-by: Daniel Micay <danielmicay@...il.com>
Signed-off-by: Daniel Micay <danielmicay@...il.com>
Signed-off-by: Kees Cook <keescook@...omium.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>
---
 include/linux/mm.h | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 73a52aba448f..03dfb466d4f5 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -799,21 +799,21 @@ static inline int is_vmalloc_or_module_addr(const void *x)
 }
 #endif
 
-extern void *kvmalloc_node(size_t size, gfp_t flags, int node);
-static inline void *kvmalloc(size_t size, gfp_t flags)
+extern void *kvmalloc_node(size_t size, gfp_t flags, int node) __alloc_size(1);
+static inline __alloc_size(1) void *kvmalloc(size_t size, gfp_t flags)
 {
 	return kvmalloc_node(size, flags, NUMA_NO_NODE);
 }
-static inline void *kvzalloc_node(size_t size, gfp_t flags, int node)
+static inline __alloc_size(1) void *kvzalloc_node(size_t size, gfp_t flags, int node)
 {
 	return kvmalloc_node(size, flags | __GFP_ZERO, node);
 }
-static inline void *kvzalloc(size_t size, gfp_t flags)
+static inline __alloc_size(1) void *kvzalloc(size_t size, gfp_t flags)
 {
 	return kvmalloc(size, flags | __GFP_ZERO);
 }
 
-static inline void *kvmalloc_array(size_t n, size_t size, gfp_t flags)
+static inline __alloc_size(1, 2) void *kvmalloc_array(size_t n, size_t size, gfp_t flags)
 {
 	size_t bytes;
 
@@ -823,13 +823,13 @@ static inline void *kvmalloc_array(size_t n, size_t size, gfp_t flags)
 	return kvmalloc(bytes, flags);
 }
 
-static inline void *kvcalloc(size_t n, size_t size, gfp_t flags)
+static inline __alloc_size(1, 2) void *kvcalloc(size_t n, size_t size, gfp_t flags)
 {
 	return kvmalloc_array(n, size, flags | __GFP_ZERO);
 }
 
-extern void *kvrealloc(const void *p, size_t oldsize, size_t newsize,
-		gfp_t flags);
+extern void *kvrealloc(const void *p, size_t oldsize, size_t newsize, gfp_t flags)
+		      __alloc_size(3);
 extern void kvfree(const void *addr);
 extern void kvfree_sensitive(const void *addr, size_t len);
 
-- 
2.30.2