Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932152AbeAKCNn (ORCPT + 1 other); Wed, 10 Jan 2018 21:13:43 -0500 Received: from mail-pg0-f68.google.com ([74.125.83.68]:37644 "EHLO mail-pg0-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754127AbeAKCJo (ORCPT ); Wed, 10 Jan 2018 21:09:44 -0500 X-Google-Smtp-Source: ACJfBoupw6w4eJ3qwDsS+mXsGe87BzpGtAVEPA8HYVg5Jnjpnsr3BfW5xeZ/0i3qq5bAJMbZQJQtug== From: Kees Cook To: linux-kernel@vger.kernel.org Cc: Kees Cook , David Windsor , Christoph Lameter , Pekka Enberg , David Rientjes , Joonsoo Kim , Andrew Morton , linux-mm@kvack.org, Linus Torvalds , Alexander Viro , Andy Lutomirski , Christoph Hellwig , "David S. Miller" , Laura Abbott , Mark Rutland , "Martin K. Petersen" , Paolo Bonzini , Christian Borntraeger , Christoffer Dall , Dave Kleikamp , Jan Kara , Luis de Bethencourt , Marc Zyngier , Rik van Riel , Matthew Garrett , linux-fsdevel@vger.kernel.org, linux-arch@vger.kernel.org, netdev@vger.kernel.org, kernel-hardening@lists.openwall.com Subject: [PATCH 37/38] usercopy: Restrict non-usercopy caches to size 0 Date: Wed, 10 Jan 2018 18:03:09 -0800 Message-Id: <1515636190-24061-38-git-send-email-keescook@chromium.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1515636190-24061-1-git-send-email-keescook@chromium.org> References: <1515636190-24061-1-git-send-email-keescook@chromium.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Return-Path: 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: linux-mm@kvack.org 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 8ac2a6320a6c..d00cd3f0f8ac 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -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, ctor); } EXPORT_SYMBOL(kmem_cache_create); -- 2.7.4