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=1.8 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SORTED_RECIPS,SPF_PASS autolearn=no 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 AAB25C43142 for ; Mon, 30 Jul 2018 18:15:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 56545208A1 for ; Mon, 30 Jul 2018 18:15:07 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 56545208A1 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 S1731557AbeG3TvQ (ORCPT ); Mon, 30 Jul 2018 15:51:16 -0400 Received: from mail-io0-f199.google.com ([209.85.223.199]:44592 "EHLO mail-io0-f199.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727020AbeG3TvQ (ORCPT ); Mon, 30 Jul 2018 15:51:16 -0400 Received: by mail-io0-f199.google.com with SMTP id e8-v6so9333812ioq.11 for ; Mon, 30 Jul 2018 11:15:03 -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=KS6JDsJVqRU8mVPHGG9CbYw0DHRsWs0geLTCwXofQt0=; b=P97eg8eVamZHsaq4tOTgewvph1zZRn++SBJtQVb6hEemQ3a/meMCVvwaUx35X+2GNA abcYnFk707GCUyZoosvgJeJEzool9aeoS+djPyJdZmkyr13CbICYWQ7CUbUu3v3zYF9g e4jqLFkNu4/gGfz+VxlmFUDrCeKA9EQ8NMmWrzG5RfqTQB+D4YPsdAiCRVQJt1pQFnq/ gC0TWRerZ4jiozvy6hbjNPjSVMEb9ydNqgtQcvG37xUls0oAbW8mP4OdPraIVqnyAx4J 5JgdYdXfZL28OcOkf1dDNX4XE1+eXbDuDpXMAMtF9fQvLRAKAm9+bjS91Bs4QcLV5M9X dQ2g== X-Gm-Message-State: AOUpUlHXa8iXwP4csZzKd+APRpXC+1hoAEVRvcAMGJikBWqVA4xEzfDy 4ciPBLnGOwC+M2SQrMbloQWGFDWJ4m/wtIEk7xUq1DHcl7a9 X-Google-Smtp-Source: AAOMgpeiFL210A9ie13P2/dFrVMV/R5FnbcpeMsGy2Aj5bLtCiwTtUtVaPYXHTyIGPwv3vjem02+2UIisk/tdz1T+AIP0B6wxHMG MIME-Version: 1.0 X-Received: by 2002:a02:4d:: with SMTP id 74-v6mr9281598jaa.15.1532974503095; Mon, 30 Jul 2018 11:15:03 -0700 (PDT) Date: Mon, 30 Jul 2018 11:15:03 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000b4f77905723b70ee@google.com> Subject: KASAN: use-after-free Read in vhost_transport_send_pkt From: syzbot To: jasowang@redhat.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, mst@redhat.com, netdev@vger.kernel.org, stefanha@redhat.com, syzkaller-bugs@googlegroups.com, virtualization@lists.linux-foundation.org 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: acb1872577b3 Linux 4.18-rc7 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14eb932c400000 kernel config: https://syzkaller.appspot.com/x/.config?x=2dc0cd7c2eefb46f dashboard link: https://syzkaller.appspot.com/bug?extid=bd391451452fb0b93039 compiler: gcc (GCC) 8.0.1 20180413 (experimental) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+bd391451452fb0b93039@syzkaller.appspotmail.com netlink: 'syz-executor5': attribute type 2 has an invalid length. binder: 28577:28588 transaction failed 29189/-22, size 0-0 line 2852 ================================================================== BUG: KASAN: use-after-free in debug_spin_lock_before kernel/locking/spinlock_debug.c:83 [inline] BUG: KASAN: use-after-free in do_raw_spin_lock+0x1c0/0x200 kernel/locking/spinlock_debug.c:112 Read of size 4 at addr ffff880194d0ec6c by task syz-executor4/28583 CPU: 1 PID: 28583 Comm: syz-executor4 Not tainted 4.18.0-rc7+ #169 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+0x242/0x2fe mm/kasan/report.c:412 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432 debug_spin_lock_before kernel/locking/spinlock_debug.c:83 [inline] do_raw_spin_lock+0x1c0/0x200 kernel/locking/spinlock_debug.c:112 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:136 [inline] _raw_spin_lock_bh+0x39/0x40 kernel/locking/spinlock.c:168 spin_lock_bh include/linux/spinlock.h:315 [inline] vhost_transport_send_pkt+0x12e/0x380 drivers/vhost/vsock.c:223 virtio_transport_send_pkt_info+0x31d/0x460 net/vmw_vsock/virtio_transport_common.c:190 virtio_transport_connect+0x17c/0x220 net/vmw_vsock/virtio_transport_common.c:588 vsock_stream_connect+0x4fb/0xfc0 net/vmw_vsock/af_vsock.c:1197 __sys_connect+0x37d/0x4c0 net/socket.c:1673 __do_sys_connect net/socket.c:1684 [inline] __se_sys_connect net/socket.c:1681 [inline] __x64_sys_connect+0x73/0xb0 net/socket.c:1681 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x456a09 Code: fd b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fa4aee5bc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 00007fa4aee5c6d4 RCX: 0000000000456a09 RDX: 0000000000000010 RSI: 0000000020000200 RDI: 0000000000000016 RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004ca838 R14: 00000000004c25fb R15: 0000000000000000 Allocated by task 28583: 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_node mm/slab.c:3682 [inline] __kmalloc_node+0x47/0x70 mm/slab.c:3689 kmalloc_node include/linux/slab.h:555 [inline] kvmalloc_node+0xb9/0xf0 mm/util.c:423 kvmalloc include/linux/mm.h:573 [inline] vhost_vsock_dev_open+0xa2/0x5a0 drivers/vhost/vsock.c:511 misc_open+0x3ca/0x560 drivers/char/misc.c:141 chrdev_open+0x25a/0x770 fs/char_dev.c:417 do_dentry_open+0x818/0xe40 fs/open.c:794 vfs_open+0x139/0x230 fs/open.c:908 do_last fs/namei.c:3399 [inline] path_openat+0x174a/0x4e10 fs/namei.c:3540 do_filp_open+0x255/0x380 fs/namei.c:3574 do_sys_open+0x584/0x760 fs/open.c:1101 __do_sys_openat fs/open.c:1128 [inline] __se_sys_openat fs/open.c:1122 [inline] __x64_sys_openat+0x9d/0x100 fs/open.c:1122 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 28579: 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 kvfree+0x61/0x70 mm/util.c:442 vhost_vsock_free drivers/vhost/vsock.c:499 [inline] vhost_vsock_dev_release+0x4fd/0x750 drivers/vhost/vsock.c:604 __fput+0x355/0x8b0 fs/file_table.c:209 ____fput+0x15/0x20 fs/file_table.c:243 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 ffff880194d05f80 which belongs to the cache kmalloc-65536 of size 65536 The buggy address is located 36076 bytes inside of 65536-byte region [ffff880194d05f80, ffff880194d15f80) The buggy address belongs to the page: page:ffffea0006534000 count:1 mapcount:0 mapping:ffff8801dac02500 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffffea0006599808 ffff8801dac01e48 ffff8801dac02500 raw: 0000000000000000 ffff880194d05f80 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff880194d0eb00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff880194d0eb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff880194d0ec00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff880194d0ec80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff880194d0ed00: fb fb fb fb fb fb fb fb 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.