lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:   Fri, 23 Sep 2022 13:28:22 -0700
From:   Kees Cook <>
To:     Vlastimil Babka <>
Cc:     Kees Cook <>,
        Christoph Lameter <>,
        Pekka Enberg <>,
        David Rientjes <>,
        Joonsoo Kim <>,
        Andrew Morton <>,
        Roman Gushchin <>,
        Hyeonggon Yoo <>,,
        "Ruhl, Michael J" <>,
        "David S. Miller" <>,
        Eric Dumazet <>,
        Jakub Kicinski <>,
        Paolo Abeni <>,
        Greg Kroah-Hartman <>,
        Nick Desaulniers <>,
        Alex Elder <>,
        Josef Bacik <>,
        David Sterba <>,
        Sumit Semwal <>,
        Christian K├Ânig <>,
        Jesse Brandeburg <>,
        Daniel Micay <>,
        Yonghong Song <>, Marco Elver <>,
        Miguel Ojeda <>,,,,,,,,,,,,
Subject: [PATCH v2 16/16] slab: Restore __alloc_size attribute to __kmalloc_track_caller

With skbuff's post-allocation use of ksize() rearranged to use
kmalloc_size_round() prior to allocation, the compiler can correctly
reason about the size of these allocations. The prior mismatch had caused
buffer overflow mitigations to erroneously fire under CONFIG_UBSAN_BOUNDS,
requiring a partial revert of the __alloc_size attributes. Restore the
attribute that had been removed in commit 93dd04ab0b2b ("slab: remove
__alloc_size attribute from __kmalloc_track_caller").

Cc: Christoph Lameter <>
Cc: Pekka Enberg <>
Cc: David Rientjes <>
Cc: Joonsoo Kim <>
Cc: Andrew Morton <>
Cc: Vlastimil Babka <>
Cc: Roman Gushchin <>
Cc: Hyeonggon Yoo <>
Signed-off-by: Kees Cook <>
 include/linux/slab.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/linux/slab.h b/include/linux/slab.h
index 727640173568..297b85ed2c29 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -693,7 +693,8 @@ static inline __alloc_size(1, 2) void *kcalloc(size_t n, size_t size, gfp_t flag
  * 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);
+extern void *__kmalloc_track_caller(size_t size, gfp_t flags, unsigned long caller)
+				   __alloc_size(1);
 #define kmalloc_track_caller(size, flags) \
 	__kmalloc_track_caller(size, flags, _RET_IP_)

Powered by blists - more mailing lists