From: syzbot <syzbot+049ea4b3691673030783@syzkaller.appspotmail.com>
To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk
Subject: general protection fault in do_remount_sb
Date: Fri, 06 Jul 2018 15:39:03 -0700 [thread overview]
Message-ID: <000000000000b2425905705c540f@google.com> (raw)
Hello,
syzbot found the following crash on:
HEAD commit: 526674536360 Add linux-next specific files for 20180706
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1642b734400000
kernel config: https://syzkaller.appspot.com/x/.config?x=c8d1cfc0cb798e48
dashboard link: https://syzkaller.appspot.com/bug?extid=049ea4b3691673030783
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=118bf170400000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1783690c400000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+049ea4b3691673030783@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)
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN
CPU: 1 PID: 4462 Comm: syz-executor233 Not tainted
4.18.0-rc3-next-20180706+ #1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:do_remount_sb+0x371/0x850 fs/super.c:992
Code: ff ff ff e8 01 85 fa 05 41 89 c5 48 8b 85 30 ff ff ff 48 8d b8 e0 00
00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84
c0 74 08 3c 03 0f 8e b5 03 00 00 48 8b 85 30 ff ff
RSP: 0018:ffff8801ac117a38 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8801caf68e40 RCX: ffffffff81c5edb2
RDX: 000000000000001c RSI: ffffffff81edb5ef RDI: 00000000000000e0
RBP: ffff8801ac117b40 R08: ffff8801ac1e2140 R09: fffffbfff11c24e5
R10: fffffbfff11c24e5 R11: ffffffff88e1272b R12: ffff8801ac117b18
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000
FS: 0000000001440880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000680 CR3: 00000001ac28f000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
do_umount fs/namespace.c:1467 [inline]
ksys_umount+0xfa7/0x12f0 fs/namespace.c:1585
__do_sys_umount fs/namespace.c:1596 [inline]
__se_sys_umount fs/namespace.c:1594 [inline]
__x64_sys_umount+0x54/0x80 fs/namespace.c:1594
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x440069
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:00007ffded829168 EFLAGS: 00000217 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 0000000000440069
RDX: 0000000000440069 RSI: 0000000000000000 RDI: 0000000020000040
RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8
R10: 00000000004002c8 R11: 0000000000000217 R12: 00000000004018f0
R13: 0000000000401980 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
Dumping ftrace buffer:
(ftrace buffer empty)
---[ end trace e836fc74e88778be ]---
RIP: 0010:do_remount_sb+0x371/0x850 fs/super.c:992
Code: ff ff ff e8 01 85 fa 05 41 89 c5 48 8b 85 30 ff ff ff 48 8d b8 e0 00
00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84
c0 74 08 3c 03 0f 8e b5 03 00 00 48 8b 85 30 ff ff
RSP: 0018:ffff8801ac117a38 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8801caf68e40 RCX: ffffffff81c5edb2
RDX: 000000000000001c RSI: ffffffff81edb5ef RDI: 00000000000000e0
RBP: ffff8801ac117b40 R08: ffff8801ac1e2140 R09: fffffbfff11c24e5
R10: fffffbfff11c24e5 R11: ffffffff88e1272b R12: ffff8801ac117b18
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000
FS: 0000000001440880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000680 CR3: 00000001ac28f000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
---
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
next reply other threads:[~2018-07-06 22:39 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-06 22:39 syzbot [this message]
2018-07-17 18:52 ` general protection fault in do_remount_sb Eric Biggers
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=000000000000b2425905705c540f@google.com \
--to=syzbot+049ea4b3691673030783@syzkaller.appspotmail.com \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=syzkaller-bugs@googlegroups.com \
--cc=viro@zeniv.linux.org.uk \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.