From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1422769AbcE3WAB (ORCPT ); Mon, 30 May 2016 18:00:01 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:52535 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1162192AbcE3Uua (ORCPT ); Mon, 30 May 2016 16:50:30 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Julien Grall , Will Deacon Subject: [PATCH 4.4 10/86] arm64: cpuinfo: Missing NULL terminator in compat_hwcap_str Date: Mon, 30 May 2016 13:48:59 -0700 Message-Id: <20160530204937.708456706@linuxfoundation.org> X-Mailer: git-send-email 2.8.3 In-Reply-To: <20160530204937.379068148@linuxfoundation.org> References: <20160530204937.379068148@linuxfoundation.org> User-Agent: quilt/0.64 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Julien Grall commit f228b494e56d949be8d8ea09d4f973d1979201bf upstream. The loop that browses the array compat_hwcap_str will stop when a NULL is encountered, however NULL is missing at the end of array. This will lead to overrun until a NULL is found somewhere in the following memory. In reality, this works out because the compat_hwcap2_str array tends to follow immediately in memory, and that *is* terminated correctly. Furthermore, the unsigned int compat_elf_hwcap is checked before printing each capability, so we end up doing the right thing because the size of the two arrays is less than 32. Still, this is an obvious mistake and should be fixed. Note for backporting: commit 12d11817eaafa414 ("arm64: Move /proc/cpuinfo handling code") moved this code in v4.4. Prior to that commit, the same change should be made in arch/arm64/kernel/setup.c. Fixes: 44b82b7700d0 "arm64: Fix up /proc/cpuinfo" Signed-off-by: Julien Grall Signed-off-by: Will Deacon Signed-off-by: Greg Kroah-Hartman --- arch/arm64/kernel/cpuinfo.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/arch/arm64/kernel/cpuinfo.c +++ b/arch/arm64/kernel/cpuinfo.c @@ -85,7 +85,8 @@ static const char *const compat_hwcap_st "idivt", "vfpd32", "lpae", - "evtstrm" + "evtstrm", + NULL }; static const char *const compat_hwcap2_str[] = {