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[PATCH v3 30/31] usercopy: Restrict non-usercopy caches to size 0

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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 <dave@nullcore.net>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm@kvack.org
Signed-off-by: Kees Cook <keescook@chromium.org>
---
 mm/slab_common.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/slab_common.c b/mm/slab_common.c
index d4e6442f9bbc..0ac45ba6685e 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -515,7 +515,7 @@ struct kmem_cache *
 kmem_cache_create(const char *name, size_t size, size_t align,
 		unsigned long 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,
 					  ctor);
 }
 EXPORT_SYMBOL(kmem_cache_create);
-- 
2.7.4

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[PATCH v3 30/31] usercopy: Restrict non-usercopy caches to size 0 Kees Cook <keescook@chromium.org> - 2017-09-20 22:50 +0200

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