[PATCH 5.16 006/164] slab: remove __alloc_size attribute from __kmalloc_track_caller

Greg Kroah-Hartman
2022-02-28T18:00:06Z

From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit 93dd04ab0b2b32ae6e70284afc764c577156658e upstream.

Commit c37495d6254c ("slab: add __alloc_size attributes for better
bounds checking") added __alloc_size attributes to a bunch of kmalloc
function prototypes. Unfortunately the change to __kmalloc_track_caller
seems to cause clang to generate broken code and the first time this is
called when booting, the box will crash.

While the compiler problems are being reworked and attempted to be
solved [1], let's just drop the attribute to solve the issue now. Once
it is resolved it can be added back.

[1] https://github.com/ClangBuiltLinux/linux/issues/1599

Fixes: c37495d6254c ("slab: add __alloc_size attributes for better bounds checking")
Cc: stable <stable@vger.kernel.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Daniel Micay <danielmicay@gmail.com>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org
Cc: llvm@lists.linux.dev
Acked-by: Nick Desaulniers <ndesaulniers@google.com>
Acked-by: David Rientjes <rientjes@google.com>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Link: https://lore.kernel.org/r/20220218131358.3032912-1-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
include/linux/slab.h | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -669,8 +669,7 @@ static inline __alloc_size(1, 2) void *k
* allocator where we care about the real place the memory allocation
* request comes from.
*/
-extern void *__kmalloc_track_caller(size_t size, gfp_t flags, unsigned long caller)
- __alloc_size(1);
+extern void *__kmalloc_track_caller(size_t size, gfp_t flags, unsigned long caller);
#define kmalloc_track_caller(size, flags) \
__kmalloc_track_caller(size, flags, _RET_IP_)