From patchwork Tue May 23 20:09:17 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 9743571 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 53D66601C2 for ; Tue, 23 May 2017 20:32:46 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 469C028821 for ; Tue, 23 May 2017 20:32:46 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 39D7928824; Tue, 23 May 2017 20:32:46 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from mother.openwall.net (mother.openwall.net [195.42.179.200]) by mail.wl.linuxfoundation.org (Postfix) with SMTP id 447E728821 for ; Tue, 23 May 2017 20:32:44 +0000 (UTC) Received: (qmail 1494 invoked by uid 550); 23 May 2017 20:32:43 -0000 Mailing-List: contact kernel-hardening-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-ID: Delivered-To: mailing list kernel-hardening@lists.openwall.com Received: (qmail 1470 invoked from network); 23 May 2017 20:32:42 -0000 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Daniel Micay , Arjan van de Ven , Rik van Riel , Kees Cook , Linus Torvalds , Peter Zijlstra , Thomas Gleixner , kernel-hardening@lists.openwall.com, Ingo Molnar Date: Tue, 23 May 2017 22:09:17 +0200 Message-Id: <20170523200913.113216861@linuxfoundation.org> X-Mailer: git-send-email 2.13.0 In-Reply-To: <20170523200907.297534241@linuxfoundation.org> References: <20170523200907.297534241@linuxfoundation.org> User-Agent: quilt/0.65 MIME-Version: 1.0 Subject: [kernel-hardening] [PATCH 4.9 140/164] stackprotector: Increase the per-task stack canarys random range from 32 bits to 64 bits on 64-bit platforms X-Virus-Scanned: ClamAV using ClamSMTP 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Daniel Micay commit 5ea30e4e58040cfd6434c2f33dc3ea76e2c15b05 upstream. The stack canary is an 'unsigned long' and should be fully initialized to random data rather than only 32 bits of random data. Signed-off-by: Daniel Micay Acked-by: Arjan van de Ven Acked-by: Rik van Riel Acked-by: Kees Cook Cc: Arjan van Ven Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: kernel-hardening@lists.openwall.com Link: http://lkml.kernel.org/r/20170504133209.3053-1-danielmicay@gmail.com Signed-off-by: Ingo Molnar Signed-off-by: Greg Kroah-Hartman --- kernel/fork.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/kernel/fork.c +++ b/kernel/fork.c @@ -521,7 +521,7 @@ static struct task_struct *dup_task_stru set_task_stack_end_magic(tsk); #ifdef CONFIG_CC_STACKPROTECTOR - tsk->stack_canary = get_random_int(); + tsk->stack_canary = get_random_long(); #endif /*