From patchwork Thu Sep 30 22:27:03 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kees Cook X-Patchwork-Id: 12529423 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BDFE8C433F5 for ; Thu, 30 Sep 2021 22:27:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9B2766128C for ; Thu, 30 Sep 2021 22:27:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1348735AbhI3W3C (ORCPT ); Thu, 30 Sep 2021 18:29:02 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33620 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344158AbhI3W2z (ORCPT ); Thu, 30 Sep 2021 18:28:55 -0400 Received: from mail-pj1-x102d.google.com (mail-pj1-x102d.google.com [IPv6:2607:f8b0:4864:20::102d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4CDCEC06176D for ; Thu, 30 Sep 2021 15:27:12 -0700 (PDT) Received: by mail-pj1-x102d.google.com with SMTP id d4-20020a17090ad98400b0019ece228690so7821196pjv.5 for ; Thu, 30 Sep 2021 15:27:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=u2ub9aDUdGkR7a45M6+RayGW3Mc5Nzpp+BqvE+GQyD4=; b=E4117kGofCjsUGdfSRTGV+cTc7zkGteSQS/YjKtNttFBJetk/lbVRQOWBkP0cou6FX nquNIIKcACgN4NjJK0Dk4cvoGaQO1QOvxc7b+qSmM0G/pcadnqVz3fSeHbawfF/+5SxM W5CUTPB7Lbr4gYH5opiwBxjGFHpaqPuAJWxhM= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=u2ub9aDUdGkR7a45M6+RayGW3Mc5Nzpp+BqvE+GQyD4=; b=cSoG4XACQEC2swGm28DudaaqSWJBEmwJl6JcLPhGTokfEXgqz58eZhE+eQAjUcKCxk 9DjqHaqF4IylUCjONUS6zVY5D51d0R3BURgl1d9Ty2daw40cRMhOWgeh0kNPKoyAYrYo 5yDQrcekLug75XaqLm3B9+iXcjoX/rIb5pbgE56wYLljWpf1zi2UVMyC2pcPMEwOPMJN ThWswTgy2zLUx7voJLIFohCTN+0XpE+A6tIJ7nKHe5gTxy3pykOeEOMTVf5gV+aLZnL6 NlKMPtXJaxpxfMcUe3bTAqtLsDHskXI8klD/3fbT/Yhf0tCKtRuVLQAcXna2faIHzrZV nO3g== X-Gm-Message-State: AOAM532fqqQVtkwurqmVeemMO31dtkaeiMm6fG21FxKM438PecTRdD2Y floy5GFbCIrrFt6UoT1y8wb67g== X-Google-Smtp-Source: ABdhPJwQdxICM7qve4++qlkIYIKGkfShLBTtRkjuyHcuH/G/SHg9YX/oL/zPE0SniAua+b9zgN40Qw== X-Received: by 2002:a17:90a:47:: with SMTP id 7mr9261738pjb.46.1633040831839; Thu, 30 Sep 2021 15:27:11 -0700 (PDT) Received: from www.outflux.net (smtp.outflux.net. [198.145.64.163]) by smtp.gmail.com with ESMTPSA id l185sm4055195pfd.29.2021.09.30.15.27.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Sep 2021 15:27:09 -0700 (PDT) From: Kees Cook To: Andrew Morton Cc: Kees Cook , Andy Whitcroft , Christoph Lameter , David Rientjes , Dennis Zhou , Dwaipayan Ray , Joe Perches , Joonsoo Kim , Lukas Bulwahn , Miguel Ojeda , Nathan Chancellor , Nick Desaulniers , Pekka Enberg , Tejun Heo , Vlastimil Babka , Daniel Micay , Masahiro Yamada , Michal Marek , clang-built-linux@googlegroups.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-kbuild@vger.kernel.org, linux-hardening@vger.kernel.org Subject: [PATCH v3 7/8] mm/page_alloc: Add __alloc_size attributes for better bounds checking Date: Thu, 30 Sep 2021 15:27:03 -0700 Message-Id: <20210930222704.2631604-8-keescook@chromium.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210930222704.2631604-1-keescook@chromium.org> References: <20210930222704.2631604-1-keescook@chromium.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1867; h=from:subject; bh=yfsJRZe5VPlXhNpESupqg/Lx3TB+JxswN2/B9c/1qRE=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBhVjm4IH1a0nV/SMwCAsRFQGt/UlwMh4gkN7oMNoN0 ZBYvfZOJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYVY5uAAKCRCJcvTf3G3AJnyND/ 9Jn6MqWe77b4tIIKVMs4JhXxwCeYTw1fq3mDnWNU4lSzNE/x3S6AYm3L/txTVyeheRfpOl7SOWwk70 /CWgalV93SIVwrfyQk3eIHwwaYv5XjUxMKTq9OmuY8shTCHA0Dmu9LfiSuLzV9yZ8WUaBEymsdsauL A3bK8vkp9rzhLE4geifpHgJ2ELbeD+A+KNRW5ojXhXB4SBMsdYtEqRGGSsMURPAyAOIn14yPxBLu4M ILNp4YRWjuhJWMN2YAc262qkmCtJjdPPTiQirjxUttsVUtLbK3BsOqjXu+T/dGyFDCb1+eCMJ0arG5 LR10YyJAmOxmECGqzhaP9h18bHNuGDnHAxpPXDn+AhFwwI/Qw5u7+QnYpaOKUkucflZJbd4KykcidL NxsnbLLexoPG7e3txH9ZWIYh72T0Se7V2u93sp9AhF80AYirhFQw26z3rqV3XeCFQkceyWEaZmiras 5eoD20fPo4Dlt04k/F5h2NaBn/LUiB8YxoMnHv2hVt8Ft/cqmhNRqkI/z5Nux69TO3JMtdRDX67id+ /uJBIcZFdewl3ka+oWfCVb3bpMGdaHVp3+bmLiQGZXR1z6tnH3gUZVUECYU98Kh0AW4LuiNi3A/xGa 0WhDo8ht51lnbE7T8FRhQ7FL8vO50a8MszXtDGPQpVltL0E0RubMc+2FVe6A== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org As already done in GrapheneOS, add the __alloc_size attribute for appropriate page allocator interfaces, to provide additional hinting for better bounds checking, assisting CONFIG_FORTIFY_SOURCE and other compiler optimizations. Cc: Andy Whitcroft Cc: Christoph Lameter Cc: David Rientjes Cc: Dennis Zhou Cc: Dwaipayan Ray Cc: Joe Perches Cc: Joonsoo Kim Cc: Lukas Bulwahn Cc: Miguel Ojeda Cc: Nathan Chancellor Cc: Nick Desaulniers Cc: Pekka Enberg Cc: Tejun Heo Cc: Vlastimil Babka Co-developed-by: Daniel Micay Signed-off-by: Daniel Micay Signed-off-by: Kees Cook --- include/linux/gfp.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/include/linux/gfp.h b/include/linux/gfp.h index 55b2ec1f965a..fbd4abc33f24 100644 --- a/include/linux/gfp.h +++ b/include/linux/gfp.h @@ -608,9 +608,9 @@ static inline struct page *alloc_pages(gfp_t gfp_mask, unsigned int order) extern unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order); extern unsigned long get_zeroed_page(gfp_t gfp_mask); -void *alloc_pages_exact(size_t size, gfp_t gfp_mask); +void *alloc_pages_exact(size_t size, gfp_t gfp_mask) __alloc_size(1); void free_pages_exact(void *virt, size_t size); -void * __meminit alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask); +__meminit void *alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask) __alloc_size(1); #define __get_free_page(gfp_mask) \ __get_free_pages((gfp_mask), 0)