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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 <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>
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@ -532,7 +532,7 @@ struct kmem_cache *
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kmem_cache_create(const char *name, size_t size, size_t align,
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slab_flags_t flags, void (*ctor)(void *))
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{
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return kmem_cache_create_usercopy(name, size, align, flags, 0, size,
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return kmem_cache_create_usercopy(name, size, align, flags, 0, 0,
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ctor);
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}
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EXPORT_SYMBOL(kmem_cache_create);
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