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,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 59514C6778F for ; Mon, 9 Jul 2018 11:49:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0F40820842 for ; Mon, 9 Jul 2018 11:49:21 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0F40820842 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 S1754563AbeGILtF (ORCPT ); Mon, 9 Jul 2018 07:49:05 -0400 Received: from mail-io0-f199.google.com ([209.85.223.199]:45166 "EHLO mail-io0-f199.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754456AbeGILtD (ORCPT ); Mon, 9 Jul 2018 07:49:03 -0400 Received: by mail-io0-f199.google.com with SMTP id i18-v6so16026120iog.12 for ; Mon, 09 Jul 2018 04:49:02 -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:message-id:subject:from:to; bh=8Bd7iO9ue96hbHofsW5+Cogc/95m+MnBhHaL4SfJcso=; b=qX79eT0aXtROiVmcgJn8BgA4GKv6OpIEajBKBcY6OJpII1L/aSG8YCvsRqLfzxNsAU ZPSRcwcOXvcbnC/oc4wCDgpiVGeZiINgGiPpyQHByIA7BZOxvFFhe8o0sFrF3AqttOjh eNCJPswSwRggWgx5Z46NyH7AQJJ235FRdSpEVdEaRAKyQjH3hk2Nw4di/uUPm+aZucnH hiMNm05+NKfaXOA6Kmt8jJwdO8idfMyC8xwHuXtdjIK4Q4o04lPNzQ8XHCVetYI4DeUS WfXRXT1KHqF/N9MBooJtdoLGMLnxDomIxfSwA6d1a0RUuqvgdWRp3gLPY9GHCFaqyxgA UADg== X-Gm-Message-State: AOUpUlGKv/HSvJpI3BXeiHloKEoUP1nvgNkxrp6OgzQktRD7dWCUjLjQ zjA6agfuqw9ryvASCp5CUspPeMsFw2rbdU8BYqs/XqjDUEOK X-Google-Smtp-Source: AAOMgpck5RCn5BQ35XlTcpUyRn1353di98J+g9HhBtvE4/SDXXfzeEmZY/xAWKlKh+0++C3BtwV0Ute8MAV6bft5CXx+mprhyiFH MIME-Version: 1.0 X-Received: by 2002:a6b:9386:: with SMTP id v128-v6mr9196615iod.27.1531136942506; Mon, 09 Jul 2018 04:49:02 -0700 (PDT) Date: Mon, 09 Jul 2018 04:49:02 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000008faf3f05708f99c0@google.com> Subject: KASAN: slab-out-of-bounds Write in crypto_dh_encode_key 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 Hello, syzbot found the following crash on: HEAD commit: d00d6d9a339d Add linux-next specific files for 20180709 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=10d146dc400000 kernel config: https://syzkaller.appspot.com/x/.config?x=94fe2b586beccacd dashboard link: https://syzkaller.appspot.com/bug?extid=6d38d558c25b53b8f4ed compiler: gcc (GCC) 8.0.1 20180413 (experimental) syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=16af4f48400000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14f562e0400000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+6d38d558c25b53b8f4ed@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 memcpy include/linux/string.h:345 [inline] BUG: KASAN: slab-out-of-bounds in dh_pack_data crypto/dh_helper.c:21 [inline] BUG: KASAN: slab-out-of-bounds in crypto_dh_encode_key+0x80e/0x830 crypto/dh_helper.c:60 Write of size 4 at addr ffff8801adbd6f10 by task syz-executor186/4466 CPU: 0 PID: 4466 Comm: syz-executor186 Not tainted 4.18.0-rc3-next-20180709+ #2 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+0x1c9/0x2b4 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+0x242/0x30d mm/kasan/report.c:412 __asan_report_store_n_noabort+0x12/0x14 mm/kasan/report.c:449 memcpy include/linux/string.h:345 [inline] dh_pack_data crypto/dh_helper.c:21 [inline] crypto_dh_encode_key+0x80e/0x830 crypto/dh_helper.c:60 __keyctl_dh_compute+0x707/0x1c00 security/keys/dh.c:316 keyctl_dh_compute+0xc5/0x11f security/keys/dh.c:427 __do_sys_keyctl security/keys/keyctl.c:1741 [inline] __se_sys_keyctl security/keys/keyctl.c:1637 [inline] __x64_sys_keyctl+0x12a/0x3b0 security/keys/keyctl.c:1637 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4403b9 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffcf524af58 EFLAGS: 00000213 ORIG_RAX: 00000000000000fa RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004403b9 RDX: 0000000020000540 RSI: 00000000200006c0 RDI: 0000000000000017 RBP: 00000000006ca018 R08: 0000000020c61fc8 R09: 00000000004002c8 R10: 0000000000000005 R11: 0000000000000213 R12: 0000000000401c40 R13: 0000000000401cd0 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 4466: 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] __keyctl_dh_compute+0x6e1/0x1c00 security/keys/dh.c:311 keyctl_dh_compute+0xc5/0x11f security/keys/dh.c:427 __do_sys_keyctl security/keys/keyctl.c:1741 [inline] __se_sys_keyctl security/keys/keyctl.c:1637 [inline] __x64_sys_keyctl+0x12a/0x3b0 security/keys/keyctl.c:1637 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 2899: 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:596 __fput+0x35d/0x930 fs/file_table.c:215 ____fput+0x15/0x20 fs/file_table.c:251 task_work_run+0x1ec/0x2a0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:192 [inline] exit_to_usermode_loop+0x313/0x370 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+0x6be/0x820 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8801adbd6f00 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 16 bytes inside of 32-byte region [ffff8801adbd6f00, ffff8801adbd6f20) The buggy address belongs to the page: page:ffffea0006b6f580 count:1 mapcount:0 mapping:ffff8801da8001c0 index:0xffff8801adbd6fc1 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffffea00075c0288 ffffea00075c0388 ffff8801da8001c0 raw: ffff8801adbd6fc1 ffff8801adbd6000 000000010000003e 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801adbd6e00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ffff8801adbd6e80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc > ffff8801adbd6f00: 00 00 03 fc fc fc fc fc 01 fc fc fc fc fc fc fc ^ ffff8801adbd6f80: 01 fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8801adbd7000: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ================================================================== --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with syzbot. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches