Received: by 10.192.165.148 with SMTP id m20csp3565271imm; Mon, 7 May 2018 14:39:39 -0700 (PDT) X-Google-Smtp-Source: AB8JxZqp1St/0OW6OtVCUThMO71E5yW3/wwYImQnCwNy/PhMyGqwUjR0PyWmUvMOAELP/ctgz4PR X-Received: by 2002:a17:902:43:: with SMTP id 61-v6mr39614922pla.112.1525729178875; Mon, 07 May 2018 14:39:38 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1525729178; cv=none; d=google.com; s=arc-20160816; b=rF/7jIH3b83G1vXlPW0PLRm6ArKVl4NhxVYMWYEibP0hz1gOx4DBI1Geagv8M19GJJ s8GnF0CDP1fNHaeohiD5KkK6vVOjQjWIy2hsWMRzADQWK6++tNEHEeq8GnO6A0wG46IG f7rI4BXP0nbjd97p10SK+j6b7F/mqNnNIYFd4rDnvxWfyS/iVIubQlt+xldMdhXSq1V2 wuYuQ9QBDaJ3FiaoYefhHrFOIr5Lzxl7XFlfHw4QeUlpVg+mJ/sGP3tYh/sXsKeHoNek pVfkXPXc/VSeIoZJejtpPI/v1tcS8PC7nCziPSg+b3wbESpdEeu2vQ48Yi/GLpWafl6k MLag== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:user-agent:content-disposition :mime-version:message-id:subject:cc:to:from:date:dkim-signature :arc-authentication-results; bh=4I58r22d+0xzegy2qSvIi+6j73Y8xSbm066s0tdD65M=; b=XacdxwzbXVLQZHEusZcAA/frKdii+BpYQwGRxTP6j3B93vKO3NvT8gJMnMwzFGBhXW kg1x9U8OVhnBP11lDuuHKzoWjP9tTK8XTZ5D5n4r7MNpdoWB4hAD4LcN3jhYszxpiMJ6 0v1ZJjBmjxDI4PhX8HArPlBR5aypYv7xCVByGtTl4/0nFvPVbf1tDWoFZLnEvQ0NjVoJ UBCh8P1ED5pDboq9Wop4Pc0+mnVjfbHqUQ5+pxanSzjHvRGoWzNxOrWBujlth37OsKPS A7tJhhuZcwG62O0y54zWI1TCMNMIC9n6iOZrDVUaqDvv7LJhHFLogakZuRrcQ0bRdDpB mPEQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=IiyGUld/; 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; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id v40-v6si22894961plg.84.2018.05.07.14.39.23; Mon, 07 May 2018 14:39:38 -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; dkim=pass header.i=@gmail.com header.s=20161025 header.b=IiyGUld/; 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; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752913AbeEGViB (ORCPT + 99 others); Mon, 7 May 2018 17:38:01 -0400 Received: from mail-wr0-f178.google.com ([209.85.128.178]:39329 "EHLO mail-wr0-f178.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752232AbeEGVh7 (ORCPT ); Mon, 7 May 2018 17:37:59 -0400 Received: by mail-wr0-f178.google.com with SMTP id q3-v6so30196808wrj.6 for ; Mon, 07 May 2018 14:37:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:mime-version:content-disposition :user-agent; bh=4I58r22d+0xzegy2qSvIi+6j73Y8xSbm066s0tdD65M=; b=IiyGUld/3MmhVnj6+jqLfSi22xOEgoi8waHgNInLtLad64pFGFA+F2UoNB0mcZnAhM E96Io/kB+YNLwfPyyHZ7YO7BwpDVKi3Xgn18J8PKex3uyrNFENKUwZjOtTmxKoDpS+UR j8nIVJuseMuXZWMzCBUbVNx63nrNRKN/d6D5QJSjM3cs9p9IYbePRku91TptwTuzqtIg 8CJkJB+yzZSmotvvc+UkMrNLDZOU0SPUiV6Pf+Hochfhw8JyYWnGsHAXiJ+3PDew0Q3x lC2WVOAzuAELRlDUu6ecAqPHG6i9lgJ2ZyAZtGo4nGY8IT/3xVJbPLzyypKqsiOtNIJ/ Vt8A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:mime-version :content-disposition:user-agent; bh=4I58r22d+0xzegy2qSvIi+6j73Y8xSbm066s0tdD65M=; b=hlBezLhsaS6IbhCRs989fbb3tyECLCeuWW9KpSc3B3jNzXKkneKe4qexcTxFi06CTN YsID06JUwQSzixys50a0Xg4XOSxJzRNHbrXUJFuOnJKfT/B6/mNqoszJgco9YkrcPyKx K+tYtuXdXW2Bu4v7CC4GlJJojwrZpGoxHGBi5H5voCwTQ8Xl468aLBeu13yagkGYTBlq 3LxBttsw2jwUvr7x6inURFLg2I/x0lY5rsXyghyEOT9iTGxHj7R25+uVUPf0NWMQ9tYu UAHWBQ8k1KLS5hkccAfmJrCkbrw5cXOPWYdj+AT97sOPWbaEmfRTrraSVeLAwJCIV+lU wbSw== X-Gm-Message-State: ALQs6tBGAN6KFHprWta4dWf9dPnmAz2ab3Plxmup94crDC6nDrEGKy2P rzRWEKHlfjZix5OavdF7ph6b X-Received: by 2002:adf:db4f:: with SMTP id f15-v6mr2320236wrj.212.1525729078691; Mon, 07 May 2018 14:37:58 -0700 (PDT) Received: from avx2 (nat4-minsk-pool-46-53-177-92.telecom.by. [46.53.177.92]) by smtp.gmail.com with ESMTPSA id b11-v6sm27117558wrf.50.2018.05.07.14.37.57 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 07 May 2018 14:37:57 -0700 (PDT) Date: Tue, 8 May 2018 00:37:55 +0300 From: Alexey Dobriyan To: tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com Cc: linux-kernel@vger.kernel.org, x86@kernel.org Subject: [PATCH] x86: pad assembly functions with INT3 Message-ID: <20180507213755.GA32406@avx2> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- arch/x86/include/asm/linkage.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- 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