linux-kernel - Re: KASAN: stack-out-of-bounds Read in move_expired

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Date:   Thu, 5 Jul 2018 18:19:04 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+eb366f9430d25498f0f6@...kaller.appspotmail.com>
Cc:     linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Al Viro <viro@...iv.linux.org.uk>
Subject: Re: KASAN: stack-out-of-bounds Read in move_expired_inodes

On Thu, Jul 5, 2018 at 6:49 AM, syzbot
<syzbot+eb366f9430d25498f0f6@...kaller.appspotmail.com> wrote:
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit:    2bdea157b999 Merge branch 'sctp-fully-support-for-dscp-and..
> git tree:       bpf-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=17d35aa4400000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=f62553dc846b0692
> dashboard link: https://syzkaller.appspot.com/bug?extid=eb366f9430d25498f0f6
> compiler:       gcc (GCC) 8.0.1 20180413 (experimental)
> syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=149e9e0c400000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17464278400000
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+eb366f9430d25498f0f6@...kaller.appspotmail.com

#syz dup: KASAN: stack-out-of-bounds Read in timerqueue_add

> random: sshd: uninitialized urandom read (32 bytes read)
> random: sshd: uninitialized urandom read (32 bytes read)
> random: sshd: uninitialized urandom read (32 bytes read)
> IPVS: ftp: loaded support on port[0] = 21
> ==================================================================
> BUG: KASAN: stack-out-of-bounds in move_expired_inodes+0xcb5/0xd80
> fs/fs-writeback.c:1120
> Read of size 8 at addr ffff8801a802c750 by task kworker/u4:4/849
>
> CPU: 0 PID: 849 Comm: kworker/u4:4 Not tainted 4.18.0-rc3+ #45
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> Workqueue: writeback wb_workfn (flush-8:0)
> 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_load8_noabort+0x14/0x20 mm/kasan/report.c:433
>  move_expired_inodes+0xcb5/0xd80 fs/fs-writeback.c:1120
>  queue_io+0x309/0x860 fs/fs-writeback.c:1169
>  wb_writeback+0xaf9/0xf80 fs/fs-writeback.c:1761
>  wb_check_old_data_flush fs/fs-writeback.c:1867 [inline]
>  wb_do_writeback fs/fs-writeback.c:1920 [inline]
>  wb_workfn+0xfb7/0x1760 fs/fs-writeback.c:1949
>  process_one_work+0xc73/0x1ba0 kernel/workqueue.c:2153
>  worker_thread+0x189/0x13c0 kernel/workqueue.c:2296
>  kthread+0x345/0x410 kernel/kthread.c:240
>  ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412
>
> Allocated by task 2170490192:
> BUG: unable to handle kernel paging request at ffffffff8c430958
> PGD 8e6d067 P4D 8e6d067 PUD 8e6e063 PMD 0
> Oops: 0000 [#1] SMP KASAN
> CPU: 0 PID: 849 Comm: kworker/u4:4 Not tainted 4.18.0-rc3+ #45
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> Workqueue: writeback wb_workfn (flush-8:0)
> RIP: 0010:depot_fetch_stack+0x10/0x30 lib/stackdepot.c:201
> Code: e8 65 30 47 fe e9 b3 fd ff ff e8 5b 30 47 fe e9 55 fd ff ff 90 90 90
> 90 90 90 89 f8 c1 ef 11 25 ff ff 1f 00 81 e7 f0 3f 00 00 <48> 03 3c c5 60 09
> 43 8b 8b 47 0c 48 83 c7 18 c7 46 10 00 00 00 00
> RSP: 0018:ffff8801d7dae930 EFLAGS: 00010006
> RAX: 00000000001fffff RBX: ffff8801a802cbb4 RCX: 0000000000000000
> RDX: 0000000000000000 RSI: ffff8801d7dae938 RDI: 0000000000003ff0
> RBP: ffff8801d7dae960 R08: ffff8801d7c4e380 R09: ffffed003b5c3ec2
> R10: ffffed003b5c3ec2 R11: ffff8801dae1f617 R12: ffff8801a802c400
> R13: ffff8801a802c750 R14: ffff8801d3f30e40 R15: ffff8801a802cbb0
> FS:  0000000000000000(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: ffffffff8c430958 CR3: 00000001bb012000 CR4: 00000000001406f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
>  describe_object mm/kasan/report.c:243 [inline]
>  print_address_description+0xfb/0x20b mm/kasan/report.c:263
>  kasan_report_error mm/kasan/report.c:354 [inline]
>  kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412
>  __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
>  move_expired_inodes+0xcb5/0xd80 fs/fs-writeback.c:1120
>  queue_io+0x309/0x860 fs/fs-writeback.c:1169
>  wb_writeback+0xaf9/0xf80 fs/fs-writeback.c:1761
> PANIC: double fault, error_code: 0x0
> CPU: 1 PID: 8116 Comm: syz-executor725 Not tainted 4.18.0-rc3+ #45
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> RIP: 0010:__lock_acquire+0x2e/0x5020 kernel/locking/lockdep.c:3294
> Code: 41
> 57
> 41 89
>  wb_check_old_data_flush fs/fs-writeback.c:1867 [inline]
>  wb_do_writeback fs/fs-writeback.c:1920 [inline]
>  wb_workfn+0xfb7/0x1760 fs/fs-writeback.c:1949
>  process_one_work+0xc73/0x1ba0 kernel/workqueue.c:2153
> cf
> 41 56
> 41 55
> 49 89
> fd 41
> 54 45
> 89 cc
> 53 65
> 4c 8b
> 34 25
> 40 ee
> 01 00
>  worker_thread+0x189/0x13c0 kernel/workqueue.c:2296
> 48 83
> e4 f0
> 48 81
> ec 60
> 03 00
> 00 48
> 8b
> 45 10
> <89>
> 94 24
> 80 00
> 00 00
>  kthread+0x345/0x410 kernel/kthread.c:240
> 48 ba
> 00 00
> 00
>  ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412
> 00 00
> Modules linked in:
> fc ff
> df 48
> Dumping ftrace buffer:
> 89 84
>    (ftrace buffer empty)
> 24 98
> CR2: ffffffff8c430958
> RSP: 0018:ffff8800fffffed0 EFLAGS: 00010082
> ---[ end trace 565e600e75d0194b ]---
> RIP: 0010:depot_fetch_stack+0x10/0x30 lib/stackdepot.c:201
> RAX: 0000000000000000 RBX: 1ffff10020000056 RCX: 0000000000000002
> RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff88f92620
> Code:
> RBP: ffff880100000258 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: dffffc0000000000 R12: 0000000000000000
> e8
> R13: ffffffff88f92620 R14: ffff8801cf4343c0 R15: 0000000000000002
> FS:  00007f2e19c1b700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
> 65
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: ffff8800fffffec8 CR3: 0000000008e6a000 CR4: 00000000001406e0
> 30
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> 47
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
> fe
>
>
> ---
> 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@...glegroups.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
>
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