Commit 6d07d1cd authored by Kees Cook's avatar Kees Cook
Browse files

usercopy: Restrict non-usercopy caches to size 0

With all known usercopied cache whitelists now defined in the
kernel, switch the default usercopy region of kmem_cache_create()
to size 0. Any new caches with usercopy regions will now need to use
kmem_cache_create_usercopy() instead of kmem_cache_create().

This patch is modified from Brad Spengler/PaX Team's PAX_USERCOPY
whitelisting code in the last public patch of grsecurity/PaX based on my
understanding of the code. Changes or omissions from the original code are
mine and don't reflect the original grsecurity/PaX code.

Cc: David Windsor <>
Cc: Christoph Lameter <>
Cc: Pekka Enberg <>
Cc: David Rientjes <>
Cc: Joonsoo Kim <>
Cc: Andrew Morton <>
Signed-off-by: default avatarKees Cook <>
parent 51776043
......@@ -532,7 +532,7 @@ struct kmem_cache *
kmem_cache_create(const char *name, size_t size, size_t align,
slab_flags_t flags, void (*ctor)(void *))
return kmem_cache_create_usercopy(name, size, align, flags, 0, size,
return kmem_cache_create_usercopy(name, size, align, flags, 0, 0,
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