From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755197AbdKAT62 (ORCPT ); Wed, 1 Nov 2017 15:58:28 -0400 Received: from mout.gmx.net ([212.227.17.20]:62960 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751778AbdKAT60 (ORCPT ); Wed, 1 Nov 2017 15:58:26 -0400 To: Linux Kernel From: =?UTF-8?Q?Toralf_F=c3=b6rster?= Subject: UBSAN: Undefined behaviour in ./arch/x86/include/asm/futex.h:53:13 Message-ID: <10e7a289-a078-5390-501f-7a90bcb2df7a@gmx.de> Date: Wed, 1 Nov 2017 20:58:23 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.4.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Language: en-GB Content-Transfer-Encoding: 7bit X-Provags-ID: V03:K0:21QTLfe5HwXD1HM2CbaR8YUlrQyFviEd4qTnV5BKPlJ4C06G2nU jaoagaZ9t5AKiZAB0YH8JrH9Jf7TjSacCK5D+vAYL7aZTwlFjj5JlSj/WUBP63I0ylQMARV 1aIkqkfRvp8ez6fY/VJIWni21kUSH1m390lf9/2+66c3BmTNwKpYUjYNmArBxP/rDuOBqmm TpXiP0I1QyHUjd8RFahtA== X-UI-Out-Filterresults: notjunk:1;V01:K0:UMcEkbGg5zY=:+wAEyDcwd6Y3KzqfXCn1MW uwkXfkcWIiYlsHejOR2h3r1jaKqL48cJUGh43ZhMXwSw8mlkjxSk+Mo8/ws7c8c7MKjFfLs2G NZ1HB8T4PmsQqpArNGFGptmqz3nYjteo0FhJEqXbDTHgL6zzdRN9y2DHvfoW5rT9nwxUPlwDy j2VT9UzL7tPjX98i8O+MReJynvYPM7HGDgbLwBiI9Mdf1ttdwxv1lwsz4zd4qatilIMU1pXWY K6SdJRfp1JGdf4LL1qFwx0mBd54GT3dn5VUZyT2k5T+BjLXuz8S3c6B7aMn6nqDYgA4nttooK 5jLSCy46wDL/zEV2X+/93R2eQareb0XeScvIY/WxI+L7s8iCGGxQuA1NvCvWyoT02lTtPPMzF RVTxSs1bJthjFKK58qbO6qlTQgckWPxxf6iWpY1nYT47siS2F8Ug/ctimWRrbUQWAfqD6B0PO AG3z9/ZS/PKz9TbzKbvlIlQPCAIEYnCYFctmHY3h5hjyHVWTkUnyYIMrhPYxpgrGlNVGxG/yo AJFRqz+J0APUFZgcMdA+c3G/NRoc0DCEsOH0U1pzl7TiQooYyQhJR8VXFyo3yItOPjuNOyRik b0qJym2DFgF2RuCZHsJB6PndSyhxjQs4+z4frJIBthJdStckqTEAs6T4O0EybGQ5xGv7Pds1V ZG0a7pzaOptheyD+7HUjXyQ4mtSF9uBZ9GLV/VY5izz2kCPWtk+h0mGV9HDqvAkFVIK+P4KhN 81Sxgqaqz5W3LSzi3mVvFBxu7g5Tu4Nlriej4n3aQPoi4GDnzKu9bUPlxZ6eBtF8FUgURy1+r StU7sJYY5IALDgd3Ph2xakvxwhZIhVb4CkyBqIM3etFHS6YgMw= Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, got this today at a stable Gentoo Linux with recent kernel : Nov 1 05:29:46 mr-fox kernel: [231282.542520] ================================================================================ Nov 1 05:29:46 mr-fox kernel: [231282.542523] UBSAN: Undefined behaviour in ./arch/x86/include/asm/futex.h:53:13 Nov 1 05:29:46 mr-fox kernel: [231282.542525] shift exponent -849 is negative Nov 1 05:29:46 mr-fox kernel: [231282.542527] CPU: 3 PID: 15032 Comm: futex Not tainted 4.13.10 #13 Nov 1 05:29:46 mr-fox kernel: [231282.542528] Hardware name: /DX79TO, BIOS SIX7910J.86A.0650.2014.0307.0138 03/07/2014 Nov 1 05:29:46 mr-fox kernel: [231282.542529] Call Trace: Nov 1 05:29:46 mr-fox kernel: [231282.542535] dump_stack+0x60/0x9a Nov 1 05:29:46 mr-fox kernel: [231282.542539] ? val_is_negative+0x2b/0x50 Nov 1 05:29:46 mr-fox kernel: [231282.542540] ubsan_epilogue+0xd/0x40 Nov 1 05:29:46 mr-fox kernel: [231282.542542] __ubsan_handle_shift_out_of_bounds+0x10d/0x170 Nov 1 05:29:46 mr-fox kernel: [231282.542545] ? get_futex_key+0x38a/0x6e0 Nov 1 05:29:46 mr-fox kernel: [231282.542546] do_futex+0xd72/0x1380 Nov 1 05:29:46 mr-fox kernel: [231282.542547] ? do_futex+0xd72/0x1380 Nov 1 05:29:46 mr-fox kernel: [231282.542548] SyS_futex+0x7a/0x180 Nov 1 05:29:46 mr-fox kernel: [231282.542551] ? SyS_write+0x4f/0xc0 Nov 1 05:29:46 mr-fox kernel: [231282.542554] entry_SYSCALL_64_fastpath+0x13/0x94 Nov 1 05:29:46 mr-fox kernel: [231282.542555] RIP: 0033:0x7fed8a79c829 Nov 1 05:29:46 mr-fox kernel: [231282.542556] RSP: 002b:00007fffadf04968 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca Nov 1 05:29:46 mr-fox kernel: [231282.542557] RAX: ffffffffffffffda RBX: 00007fed8aa55ae0 RCX: 00007fed8a79c829 Nov 1 05:29:46 mr-fox kernel: [231282.542558] RDX: badda7a0facefeed RSI: 0000000000000005 RDI: 00007fed8ae2bffc Nov 1 05:29:46 mr-fox kernel: [231282.542559] RBP: 0000000000001011 R08: 00007fed8ae25ffc R09: 00000000a0caffee Nov 1 05:29:46 mr-fox kernel: [231282.542560] R10: 000000000000000b R11: 0000000000000246 R12: 0000000000000000 Nov 1 05:29:46 mr-fox kernel: [231282.542560] R13: 00007fed8aa55b38 R14: 0000000000000000 R15: 0000000000001030 Nov 1 05:29:46 mr-fox kernel: [231282.542561] ================================================================================ -- Toralf PGP C4EACDDE 0076E94E