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[209.132.180.67]) by mx.google.com with ESMTP id z21-v6si8800279plo.465.2018.05.14.05.54.32; Mon, 14 May 2018 05:54:46 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753681AbeENMyG (ORCPT + 99 others); Mon, 14 May 2018 08:54:06 -0400 Received: from terminus.zytor.com ([198.137.202.136]:38525 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753628AbeENMyE (ORCPT ); Mon, 14 May 2018 08:54:04 -0400 Received: from terminus.zytor.com (localhost [127.0.0.1]) by terminus.zytor.com (8.15.2/8.15.2) with ESMTPS id w4ECrJus739163 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Mon, 14 May 2018 05:53:19 -0700 Received: (from tipbot@localhost) by terminus.zytor.com (8.15.2/8.15.2/Submit) id w4ECrJnh739159; Mon, 14 May 2018 05:53:19 -0700 Date: Mon, 14 May 2018 05:53:19 -0700 X-Authentication-Warning: terminus.zytor.com: tipbot set sender to tipbot@zytor.com using -f From: tip-bot for Alexey Dobriyan Message-ID: Cc: mingo@kernel.org, tglx@linutronix.de, luto@kernel.org, peterz@infradead.org, jpoimboe@redhat.com, adobriyan@gmail.com, torvalds@linux-foundation.org, dvlasenk@redhat.com, linux-kernel@vger.kernel.org, h.peter.anvin@intel.com, bp@alien8.de, brgerst@gmail.com, hpa@zytor.com Reply-To: torvalds@linux-foundation.org, tglx@linutronix.de, mingo@kernel.org, jpoimboe@redhat.com, adobriyan@gmail.com, luto@kernel.org, peterz@infradead.org, brgerst@gmail.com, hpa@zytor.com, linux-kernel@vger.kernel.org, dvlasenk@redhat.com, h.peter.anvin@intel.com, bp@alien8.de In-Reply-To: <20180507213755.GA32406@avx2> References: <20180507213755.GA32406@avx2> To: linux-tip-commits@vger.kernel.org Subject: [tip:x86/pti] x86/asm: Pad assembly functions with INT3 instructions Git-Commit-ID: 51bad67ffbce0aaa44579f84ef5d05597054ec6a X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline X-Spam-Status: No, score=-2.9 required=5.0 tests=ALL_TRUSTED,BAYES_00, T_DATE_IN_FUTURE_96_Q autolearn=ham autolearn_force=no version=3.4.1 X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on terminus.zytor.com Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: 51bad67ffbce0aaa44579f84ef5d05597054ec6a Gitweb: https://git.kernel.org/tip/51bad67ffbce0aaa44579f84ef5d05597054ec6a Author: Alexey Dobriyan AuthorDate: Tue, 8 May 2018 00:37:55 +0300 Committer: Ingo Molnar CommitDate: Mon, 14 May 2018 11:43:03 +0200 x86/asm: Pad assembly functions with INT3 instructions Use INT3 instead of NOP. All that padding between functions is an illegal area, no legitimate code should jump into it. I've checked x86_64 allyesconfig disassembly, all changes looks sane: INT3 is only used after RET or unconditional JMP. Signed-off-by: Alexey Dobriyan Acked-by: H. Peter Anvin Acked-by: Thomas Gleixner Cc: Andy Lutomirski Cc: Borislav Petkov Cc: Brian Gerst Cc: Denys Vlasenko Cc: Josh Poimboeuf Cc: Linus Torvalds Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/20180507213755.GA32406@avx2 Signed-off-by: Ingo Molnar --- arch/x86/include/asm/linkage.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/include/asm/linkage.h b/arch/x86/include/asm/linkage.h index 14caa9d9fb7f..c0b70bc1e659 100644 --- a/arch/x86/include/asm/linkage.h +++ b/arch/x86/include/asm/linkage.h @@ -18,7 +18,7 @@ name: #if defined(CONFIG_X86_64) || defined(CONFIG_X86_ALIGNMENT_16) -#define __ALIGN .p2align 4, 0x90 +#define __ALIGN .p2align 4, 0xCC #define __ALIGN_STR __stringify(__ALIGN) #endif