From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on dcvr.yhbt.net X-Spam-Level: X-Spam-ASN: AS31976 209.132.180.0/23 X-Spam-Status: No, score=-4.6 required=3.0 tests=AWL,BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,RCVD_IN_DNSWL_HI,RP_MATCHES_RCVD shortcircuit=no autolearn=ham autolearn_force=no version=3.4.0 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by dcvr.yhbt.net (Postfix) with ESMTP id E3E632027C for ; Thu, 1 Jun 2017 08:29:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751698AbdFAI2z (ORCPT ); Thu, 1 Jun 2017 04:28:55 -0400 Received: from mx2.suse.de ([195.135.220.15]:39423 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751423AbdFAI2y (ORCPT ); Thu, 1 Jun 2017 04:28:54 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (charybdis-ext.suse.de [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 239AAAD4F; Thu, 1 Jun 2017 08:28:53 +0000 (UTC) From: Andreas Schwab To: git@vger.kernel.org Subject: Unaligned accesses in sha1dc CC: Marc Stevens , =?utf-8?B?w4Z2YXIgQXJuZmrDtnLDsA==?= Bjarmason X-Yow: I guess you guys got BIG MUSCLES from doing too much STUDYING! Date: Thu, 01 Jun 2017 10:28:52 +0200 Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.2 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain Sender: git-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org The sh1dc implementation is making unaligned accesses, which will crash on some architectures, others have to emulate them in software. Breakpoint 4, sha1_compression_states (ihv=0x600ffffffffe7010, m=, W=0x600ffffffffe70a8, states=0x600ffffffffe7328) at sha1dc/sha1.c:398 398 SHA1COMPRESS_FULL_ROUND2_STEP(e, a, b, c, d, W, 21, temp); (gdb) n 403 SHA1COMPRESS_FULL_ROUND2_STEP(d, e, a, b, c, W, 22, temp); (gdb) 408 SHA1COMPRESS_FULL_ROUND2_STEP(c, d, e, a, b, W, 23, temp); (gdb) 413 SHA1COMPRESS_FULL_ROUND2_STEP(b, c, d, e, a, W, 24, temp); (gdb) 418 SHA1COMPRESS_FULL_ROUND2_STEP(a, b, c, d, e, W, 25, temp); (gdb) 291 SHA1COMPRESS_FULL_ROUND1_STEP_LOAD(a, b, c, d, e, m, W, 0, temp); (gdb) git(21728): unaligned access to 0x600000000009f8d5, ip=0x40000000003336d0 423 SHA1COMPRESS_FULL_ROUND2_STEP(e, a, b, c, d, W, 26, temp); Andreas. -- Andreas Schwab, SUSE Labs, schwab@suse.de GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE 1748 E4D4 88E3 0EEA B9D7 "And now for something completely different."