From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by aws-us-west-2-korg-lkml-1.web.codeaurora.org (Postfix) with ESMTP id 8B3E6C004E4 for ; Wed, 13 Jun 2018 11:32:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 32EFA208B2 for ; Wed, 13 Jun 2018 11:32:06 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 32EFA208B2 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935340AbeFMLcD (ORCPT ); Wed, 13 Jun 2018 07:32:03 -0400 Received: from mail-it0-f72.google.com ([209.85.214.72]:44546 "EHLO mail-it0-f72.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S935238AbeFMLcC (ORCPT ); Wed, 13 Jun 2018 07:32:02 -0400 Received: by mail-it0-f72.google.com with SMTP id 202-v6so2213408itw.9 for ; Wed, 13 Jun 2018 04:32:02 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:in-reply-to:message-id:subject :from:to; bh=IBoRI2FJjw3oq/Hyhl0lPWkNY6ZindWm8wnTcmibsqw=; b=NxnR4zaojsn9fWvnFpZQDD7R3V9ztAUCmhQlgJUopFK+0BdgaEA80wKOJcd22sE9n0 CM8OXfQwCPYUsSlp1LJp/zUyf9MUgdj+mZ34cl8TQWSBmxZaVjGrcvuTT9ALMzy8O6xd DXizYdpXvcKo1HOWRFsKU5nCr9fKpaD/kLTnhbaUtRgNAQPcZEr2+6X4n+aMhgnc8/lQ fy5YBi6kxog/SkBqWS6YHXZv6fBVWrbnZNCPNv++P+5CSRd90YdjOXP6JdnPgnge0spI ZLlkk18sbnMJUaCxGV6vC6GuKPU5ECE1fo0XjNkuUn1sVN0Dx8/06ykp6RreiZE6zPxB AH6Q== X-Gm-Message-State: APt69E0KX6pH6htnk1jhNdXDkAA0z5wZBoIVbWxH3P9Wb0k1EwsR1SWC Ju6inJfF7xKPTkOq9CPzNig0crKG6zAYgnH71jNidMneIDxJ X-Google-Smtp-Source: ADUXVKK3Y0W4OaN1hOg8RgCOygdos7KD+PGlAVQdPQZAZuQs698R/AqyJ98cm4muPTD2FKaaXrGgMQiUbqdxWaw+5tKNLItO+P8w MIME-Version: 1.0 X-Received: by 2002:a6b:b242:: with SMTP id b63-v6mr1920623iof.47.1528889521747; Wed, 13 Jun 2018 04:32:01 -0700 (PDT) Date: Wed, 13 Jun 2018 04:32:01 -0700 In-Reply-To: <0000000000005abb37056e840d40@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000d85140056e845443@google.com> Subject: Re: KASAN: slab-out-of-bounds Read in crypto_morus640_decrypt_chunk From: syzbot To: davem@davemloft.net, herbert@gondor.apana.org.au, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org syzbot has found a reproducer for the following crash on: HEAD commit: f0dc7f9c6dd9 Merge git://git.kernel.org/pub/scm/linux/kern.. git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=16685c1f800000 kernel config: https://syzkaller.appspot.com/x/.config?x=fa9c20c48788d1c1 dashboard link: https://syzkaller.appspot.com/bug?extid=1fafa9c4cf42df33f716 compiler: gcc (GCC) 8.0.1 20180413 (experimental) syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=1122e4cf800000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1794783f800000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+1fafa9c4cf42df33f716@syzkaller.appspotmail.com random: sshd: uninitialized urandom read (32 bytes read) random: sshd: uninitialized urandom read (32 bytes read) random: sshd: uninitialized urandom read (32 bytes read) random: sshd: uninitialized urandom read (32 bytes read) ================================================================== BUG: KASAN: slab-out-of-bounds in crypto_morus640_load_a crypto/morus640.c:111 [inline] BUG: KASAN: slab-out-of-bounds in crypto_morus640_decrypt_chunk+0xcf8/0xd20 crypto/morus640.c:278 Read of size 4 at addr ffff8801d76dc848 by task syz-executor575/4437 CPU: 1 PID: 4437 Comm: syz-executor575 Not tainted 4.17.0+ #84 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1b9/0x294 lib/dump_stack.c:113 print_address_description+0x6c/0x20b mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432 crypto_morus640_load_a crypto/morus640.c:111 [inline] crypto_morus640_decrypt_chunk+0xcf8/0xd20 crypto/morus640.c:278 crypto_morus640_process_crypt.isra.12+0x153/0x230 crypto/morus640.c:376 crypto_morus640_crypt+0x42e/0x9f0 crypto/morus640.c:442 crypto_morus640_decrypt+0x23e/0x3d0 crypto/morus640.c:485 crypto_aead_decrypt include/crypto/aead.h:370 [inline] _aead_recvmsg crypto/algif_aead.c:315 [inline] aead_recvmsg+0x13cc/0x1ba0 crypto/algif_aead.c:334 sock_recvmsg_nosec net/socket.c:818 [inline] sock_recvmsg+0xd0/0x110 net/socket.c:825 ___sys_recvmsg+0x2b6/0x680 net/socket.c:2323 __sys_recvmsg+0x112/0x260 net/socket.c:2372 __do_sys_recvmsg net/socket.c:2382 [inline] __se_sys_recvmsg net/socket.c:2379 [inline] __x64_sys_recvmsg+0x78/0xb0 net/socket.c:2379 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x43fef9 Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 6b 45 00 00 c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffd6c88d3b8 EFLAGS: 00000207 ORIG_RAX: 000000000000002f RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fef9 RDX: 0000000000000000 RSI: 0000000020002840 RDI: 0000000000000004 RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 R10: 00000000004002c8 R11: 0000000000000207 R12: 0000000000401820 R13: 00000000004018b0 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 4437: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 __do_kmalloc mm/slab.c:3718 [inline] __kmalloc+0x14e/0x760 mm/slab.c:3727 kmalloc include/linux/slab.h:518 [inline] kzalloc include/linux/slab.h:706 [inline] skcipher_next_slow crypto/skcipher.c:253 [inline] skcipher_walk_next+0x750/0x1850 crypto/skcipher.c:357 skcipher_walk_first+0x151/0x410 crypto/skcipher.c:442 skcipher_walk_aead_common+0x7f8/0xbc0 crypto/skcipher.c:539 skcipher_walk_aead_decrypt+0xc7/0x100 crypto/skcipher.c:572 crypto_morus640_process_crypt.isra.12+0x9c/0x230 crypto/morus640.c:370 crypto_morus640_crypt+0x42e/0x9f0 crypto/morus640.c:442 crypto_morus640_decrypt+0x23e/0x3d0 crypto/morus640.c:485 crypto_aead_decrypt include/crypto/aead.h:370 [inline] _aead_recvmsg crypto/algif_aead.c:315 [inline] aead_recvmsg+0x13cc/0x1ba0 crypto/algif_aead.c:334 sock_recvmsg_nosec net/socket.c:818 [inline] sock_recvmsg+0xd0/0x110 net/socket.c:825 ___sys_recvmsg+0x2b6/0x680 net/socket.c:2323 __sys_recvmsg+0x112/0x260 net/socket.c:2372 __do_sys_recvmsg net/socket.c:2382 [inline] __se_sys_recvmsg net/socket.c:2379 [inline] __x64_sys_recvmsg+0x78/0xb0 net/socket.c:2379 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 2800: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xd9/0x260 mm/slab.c:3813 single_release+0x8f/0xb0 fs/seq_file.c:609 __fput+0x353/0x890 fs/file_table.c:209 ____fput+0x15/0x20 fs/file_table.c:243 task_work_run+0x1e4/0x290 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:192 [inline] exit_to_usermode_loop+0x302/0x360 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6ac/0x800 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8801d76dc840 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 8 bytes inside of 32-byte region [ffff8801d76dc840, ffff8801d76dc860) The buggy address belongs to the page: page:ffffea00075db700 count:1 mapcount:0 mapping:ffff8801da8001c0 index:0xffff8801d76dcfc1 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffff8801da801238 ffffea00075dcdc8 ffff8801da8001c0 raw: ffff8801d76dcfc1 ffff8801d76dc000 000000010000003b 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801d76dc700: fb fb fb fb fc fc fc fc 00 00 fc fc fc fc fc fc ffff8801d76dc780: fb fb fb fb fc fc fc fc 00 00 fc fc fc fc fc fc > ffff8801d76dc800: 00 00 00 00 fc fc fc fc 00 fc fc fc fc fc fc fc ^ ffff8801d76dc880: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ffff8801d76dc900: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ==================================================================