# \[PATCH v3 30/31\] usercopy: Restrict non-usercopy caches to size 0 - From: Kees Cook \ - Date: 2017-09-20 20:45:36 - List: netdev - Page: https://ratatoskr.run/netdev/2017/09/126494 - Thread: https://ratatoskr.run/linux-mm/2017/09/126397/t.md ```text 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 Cc: Signed-off-by: Kees Cook --- 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org ```