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_HELO_NONE,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 A42B9C33CB1 for ; Fri, 17 Jan 2020 06:45:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7C51C2083E for ; Fri, 17 Jan 2020 06:45:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727804AbgAQGpL (ORCPT ); Fri, 17 Jan 2020 01:45:11 -0500 Received: from mail-il1-f199.google.com ([209.85.166.199]:47982 "EHLO mail-il1-f199.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726675AbgAQGpK (ORCPT ); Fri, 17 Jan 2020 01:45:10 -0500 Received: by mail-il1-f199.google.com with SMTP id x69so18015514ill.14 for ; Thu, 16 Jan 2020 22:45:10 -0800 (PST) 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=ALoOrIWozL+7PLCcGhdyW5y50eCbmJ6yl03zW3710zk=; b=sstiiZ/1gYRZs+PTp+js6A+hdEYejfA2KleegXWAnHMR3ZL97M8yqQcD8+moL9xtxm Db9cPZ19NgQjuyS7f7YmUHg2lr96uddVK4KzzBJLTNHM1V6lF2RX2K8OYdyUlp6McmiU 6bjuAw2NGJHh4xcbgSWIwDNAjPilQ4vLFt9MK1bI8NWB36jig0UtcHrN42wKSYPfHxYK hQpDltwAT86m6BhyGBO7snQQpGCsnZRbYsdX7F5W5X471Fr02tgwCt2USeLlIfnrMRTI U9qLHS60MqckbfShAAatNLrkIroKOHsVtl/6jG/raOM0J/a+DqtUIAvsYmKmGWCAJPog wmbw== X-Gm-Message-State: APjAAAWvQfkUIXZ0w3dOwUvnnP6RlKVKuypgx5Brdgi9nm+8qZiHMAe2 PeRwfZDRsn3RsJ/+BaJASNvolzLZkwx76EuPtVeifuvov9kp X-Google-Smtp-Source: APXvYqx7cLsfbkr4tyHg0yBuh+Y7mfDrXeXDvyvI806pApG8VLr6QRUQBtIB1yUYwA6ZJYsma6GMsTQKy8JR2FZqPF/P2HbYS2Ht MIME-Version: 1.0 X-Received: by 2002:a02:2a08:: with SMTP id w8mr32302555jaw.86.1579243509817; Thu, 16 Jan 2020 22:45:09 -0800 (PST) Date: Thu, 16 Jan 2020 22:45:09 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000006aa78f059c5048c1@google.com> Subject: KASAN: use-after-free Read in __locks_wake_up_blocks From: syzbot To: bfields@fieldses.org, jlayton@kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: f5ae2ea6 Fix built-in early-load Intel microcode alignment git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=12c103aee00000 kernel config: https://syzkaller.appspot.com/x/.config?x=d9290aeb7e6cf1c4 dashboard link: https://syzkaller.appspot.com/bug?extid=922689db06e57b69c240 compiler: gcc (GCC) 9.0.0 20181231 (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+922689db06e57b69c240@syzkaller.appspotmail.com ================================================================== BUG: KASAN: use-after-free in __wake_up_common+0x5d7/0x610 kernel/sched/wait.c:81 Read of size 8 at addr ffff88808e074888 by task syz-executor.0/20572 CPU: 1 PID: 20572 Comm: syz-executor.0 Not tainted 5.5.0-rc6-syzkaller #0 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+0x197/0x210 lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xd4/0x30b mm/kasan/report.c:374 __kasan_report.cold+0x1b/0x41 mm/kasan/report.c:506 kasan_report+0x12/0x20 mm/kasan/common.c:639 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:135 __wake_up_common+0x5d7/0x610 kernel/sched/wait.c:81 __wake_up_common_lock+0xea/0x150 kernel/sched/wait.c:123 __wake_up+0xe/0x10 kernel/sched/wait.c:142 __locks_wake_up_blocks+0x120/0x180 fs/locks.c:742 locks_delete_block+0x73/0xf0 fs/locks.c:773 flock_lock_inode_wait fs/locks.c:2143 [inline] locks_lock_inode_wait+0x16b/0x3f0 fs/locks.c:2162 locks_lock_file_wait include/linux/fs.h:1328 [inline] __do_sys_flock fs/locks.c:2225 [inline] __se_sys_flock fs/locks.c:2188 [inline] __x64_sys_flock+0x30c/0x370 fs/locks.c:2188 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45aff9 Code: ad b6 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fb6469d4c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000049 RAX: ffffffffffffffda RBX: 00007fb6469d56d4 RCX: 000000000045aff9 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000000c6 R14: 00000000004c1bff R15: 000000000075bf2c Allocated by task 20575: save_stack+0x23/0x90 mm/kasan/common.c:72 set_track mm/kasan/common.c:80 [inline] __kasan_kmalloc mm/kasan/common.c:513 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:486 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:521 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc mm/slab.c:3320 [inline] kmem_cache_alloc+0x121/0x710 mm/slab.c:3484 kmem_cache_zalloc include/linux/slab.h:660 [inline] locks_alloc_lock+0x1d/0x1d0 fs/locks.c:346 flock_make_lock+0x241/0x2b0 fs/locks.c:487 __do_sys_flock fs/locks.c:2207 [inline] __se_sys_flock fs/locks.c:2188 [inline] __x64_sys_flock+0xd5/0x370 fs/locks.c:2188 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 20575: save_stack+0x23/0x90 mm/kasan/common.c:72 set_track mm/kasan/common.c:80 [inline] kasan_set_free_info mm/kasan/common.c:335 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:474 kasan_slab_free+0xe/0x10 mm/kasan/common.c:483 __cache_free mm/slab.c:3426 [inline] kmem_cache_free+0x86/0x320 mm/slab.c:3694 locks_free_lock fs/locks.c:383 [inline] __do_sys_flock fs/locks.c:2228 [inline] __se_sys_flock fs/locks.c:2188 [inline] __x64_sys_flock+0x23b/0x370 fs/locks.c:2188 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88808e0747f0 which belongs to the cache file_lock_cache of size 264 The buggy address is located 152 bytes inside of 264-byte region [ffff88808e0747f0, ffff88808e0748f8) The buggy address belongs to the page: page:ffffea0002381d00 refcount:1 mapcount:0 mapping:ffff8880a9932700 index:0xffff88808e074a80 raw: 00fffe0000000200 ffffea00025f86c8 ffffea0002585ac8 ffff8880a9932700 raw: ffff88808e074a80 ffff88808e074040 000000010000000a 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88808e074780: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fb fb ffff88808e074800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff88808e074880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc ^ ffff88808e074900: fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb fb ffff88808e074980: 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#status for how to communicate with syzbot.