general protection fault in ovl_free_fs
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syzbot
Sep 7, 2018, 4:38:03 AM9/7/18
to linux-...@vger.kernel.org, linux-...@vger.kernel.org, mik...@szeredi.hu, syzkall...@googlegroups.com
Hello,
syzbot found the following crash on:
HEAD commit: b36fdc6853a3 Merge tag 'gpio-v4.19-2' of git://git.kernel...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13579cd1400000
kernel config: https://syzkaller.appspot.com/x/.config?x=6c9564cd177daf0c
dashboard link: https://syzkaller.appspot.com/bug?extid=c75f181dc8429d2eb887
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+c75f18...@syzkaller.appspotmail.com
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: 0 PID: 12806 Comm: syz-executor3 Not tainted 4.19.0-rc2+ #224
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:ovl_free_fs+0x4d9/0x650 fs/overlayfs/super.c:226
Code: 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 67 01 00 00 48
b8 00 00 00 00 00 fc ff df 4c 8b 23 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 0f
85 56 01 00 00 49 8b 3c 24 e8 d4 0a 01 00 e9 37 fc
RSP: 0018:ffff8800aec7f7b8 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff880111d7ef00 RCX: ffffc90003487000
RDX: 0000000000000000 RSI: ffffffff827c844a RDI: 0000000000000001
RBP: ffff8800aec7f810 R08: ffff8801b9cae080 R09: ffffed003b6046de
R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000000
R13: ffff880111d7ef20 R14: fffffffffffffff4 R15: ffff880111d7ef00
FS: 00007f715a1ab700(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000002242e80 CR3: 000000018698d000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending
cookies. Check SNMP counters.
Call Trace:
ovl_fill_super+0x4f1/0x3ffc fs/overlayfs/super.c:1508
mount_nodev+0x6b/0x110 fs/super.c:1204
ovl_mount+0x2c/0x40 fs/overlayfs/super.c:1516
mount_fs+0xae/0x328 fs/super.c:1261
vfs_kern_mount.part.35+0xdc/0x4f0 fs/namespace.c:961
vfs_kern_mount fs/namespace.c:951 [inline]
do_new_mount fs/namespace.c:2457 [inline]
do_mount+0x581/0x30e0 fs/namespace.c:2787
ksys_mount+0x12d/0x140 fs/namespace.c:3003
__do_sys_mount fs/namespace.c:3017 [inline]
__se_sys_mount fs/namespace.c:3014 [inline]
__x64_sys_mount+0xbe/0x150 fs/namespace.c:3014
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457099
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:00007f715a1aac78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f715a1ab6d4 RCX: 0000000000457099
RDX: 00000000200000c0 RSI: 0000000020000000 RDI: 0000000000000000
RBP: 00000000009300a0 R08: 0000000020000100 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 00000000004d3300 R14: 00000000004c8241 R15: 000000000000002a
Modules linked in:
Dumping ftrace buffer:
(ftrace buffer empty)
---[ end trace a35d50b1706abe7c ]---
RIP: 0010:ovl_free_fs+0x4d9/0x650 fs/overlayfs/super.c:226
Code: 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 67 01 00 00 48
b8 00 00 00 00 00 fc ff df 4c 8b 23 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 0f
85 56 01 00 00 49 8b 3c 24 e8 d4 0a 01 00 e9 37 fc
RSP: 0018:ffff8800aec7f7b8 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff880111d7ef00 RCX: ffffc90003487000
RDX: 0000000000000000 RSI: ffffffff827c844a RDI: 0000000000000001
RBP: ffff8800aec7f810 R08: ffff8801b9cae080 R09: ffffed003b6046de
R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000000
R13: ffff880111d7ef20 R14: fffffffffffffff4 R15: ffff880111d7ef00
FS: 00007f715a1ab700(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000002242e80 CR3: 000000018698d000 CR4: 00000000001426f0
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 syzk...@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 found the following crash on:
HEAD commit: b36fdc6853a3 Merge tag 'gpio-v4.19-2' of git://git.kernel...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13579cd1400000
kernel config: https://syzkaller.appspot.com/x/.config?x=6c9564cd177daf0c
dashboard link: https://syzkaller.appspot.com/bug?extid=c75f181dc8429d2eb887
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+c75f18...@syzkaller.appspotmail.com
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: 0 PID: 12806 Comm: syz-executor3 Not tainted 4.19.0-rc2+ #224
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:ovl_free_fs+0x4d9/0x650 fs/overlayfs/super.c:226
Code: 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 67 01 00 00 48
b8 00 00 00 00 00 fc ff df 4c 8b 23 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 0f
85 56 01 00 00 49 8b 3c 24 e8 d4 0a 01 00 e9 37 fc
RSP: 0018:ffff8800aec7f7b8 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff880111d7ef00 RCX: ffffc90003487000
RDX: 0000000000000000 RSI: ffffffff827c844a RDI: 0000000000000001
RBP: ffff8800aec7f810 R08: ffff8801b9cae080 R09: ffffed003b6046de
R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000000
R13: ffff880111d7ef20 R14: fffffffffffffff4 R15: ffff880111d7ef00
FS: 00007f715a1ab700(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000002242e80 CR3: 000000018698d000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending
cookies. Check SNMP counters.
Call Trace:
ovl_fill_super+0x4f1/0x3ffc fs/overlayfs/super.c:1508
mount_nodev+0x6b/0x110 fs/super.c:1204
ovl_mount+0x2c/0x40 fs/overlayfs/super.c:1516
mount_fs+0xae/0x328 fs/super.c:1261
vfs_kern_mount.part.35+0xdc/0x4f0 fs/namespace.c:961
vfs_kern_mount fs/namespace.c:951 [inline]
do_new_mount fs/namespace.c:2457 [inline]
do_mount+0x581/0x30e0 fs/namespace.c:2787
ksys_mount+0x12d/0x140 fs/namespace.c:3003
__do_sys_mount fs/namespace.c:3017 [inline]
__se_sys_mount fs/namespace.c:3014 [inline]
__x64_sys_mount+0xbe/0x150 fs/namespace.c:3014
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457099
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:00007f715a1aac78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f715a1ab6d4 RCX: 0000000000457099
RDX: 00000000200000c0 RSI: 0000000020000000 RDI: 0000000000000000
RBP: 00000000009300a0 R08: 0000000020000100 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 00000000004d3300 R14: 00000000004c8241 R15: 000000000000002a
Modules linked in:
Dumping ftrace buffer:
(ftrace buffer empty)
---[ end trace a35d50b1706abe7c ]---
RIP: 0010:ovl_free_fs+0x4d9/0x650 fs/overlayfs/super.c:226
Code: 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 67 01 00 00 48
b8 00 00 00 00 00 fc ff df 4c 8b 23 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 0f
85 56 01 00 00 49 8b 3c 24 e8 d4 0a 01 00 e9 37 fc
RSP: 0018:ffff8800aec7f7b8 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff880111d7ef00 RCX: ffffc90003487000
RDX: 0000000000000000 RSI: ffffffff827c844a RDI: 0000000000000001
RBP: ffff8800aec7f810 R08: ffff8801b9cae080 R09: ffffed003b6046de
R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000000
R13: ffff880111d7ef20 R14: fffffffffffffff4 R15: ffff880111d7ef00
FS: 00007f715a1ab700(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000002242e80 CR3: 000000018698d000 CR4: 00000000001426f0
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 syzk...@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
Sep 8, 2018, 9:43:03 PM9/8/18
to linux-...@vger.kernel.org, linux-...@vger.kernel.org, mik...@szeredi.hu, syzkall...@googlegroups.com
syzbot has found a reproducer for the following crash on:
HEAD commit: d7b686ebf704 Merge branch 'i2c/for-current' of git://git.k..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=148ac149400000
kernel config: https://syzkaller.appspot.com/x/.config?x=8f59875069d721b6
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14b16421400000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+c75f18...@syzkaller.appspotmail.com
R10: 0000000000000000 R11: 0000000000000246 R12: ffffffffffffffff
R13: 0000000000000003 R14: 0000000000000000 R15: 0000000000000000
overlayfs: failed to clone upperpath
CPU: 1 PID: 5473 Comm: syz-executor554 Not tainted 4.19.0-rc2+ #7
Code: 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 78 01 00 00 48
RSP: 0018:ffff8801b3de7798 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff8801d87b7800 RCX: ffffffff828cacaf
RDX: 0000000000000000 RSI: ffffffff828cb065 RDI: 0000000000000001
RBP: ffff8801b3de77f0 R08: ffff8801c44ba680 R09: ffffed003b5e4732
R10: ffffed003b5e4732 R11: ffff8801daf23993 R12: 0000000000000000
R13: ffff8801d87b7820 R14: fffffffffffffff4 R15: ffff8801d87b7800
FS: 000000000207a880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
ovl_fill_super+0x4f4/0x40a3 fs/overlayfs/super.c:1508
Code: ad ce fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7
RSP: 002b:00007ffef77a0948 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000445119
RDX: 00000000200000c0 RSI: 0000000020000080 RDI: 0000000000000000
RBP: 00007ffef77a0960 R08: 0000000020000100 R09: 00007ffef77f92f4
R10: 0000000000000000 R11: 0000000000000246 R12: ffffffffffffffff
R13: 0000000000000003 R14: 0000000000000000 R15: 0000000000000000
RIP: 0010:ovl_free_fs+0x504/0x690 fs/overlayfs/super.c:226
Code: 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 78 01 00 00 48
RSP: 0018:ffff8801b3de7798 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff8801d87b7800 RCX: ffffffff828cacaf
RDX: 0000000000000000 RSI: ffffffff828cb065 RDI: 0000000000000001
RBP: ffff8801b3de77f0 R08: ffff8801c44ba680 R09: ffffed003b5e4732
R10: ffffed003b5e4732 R11: ffff8801daf23993 R12: 0000000000000000
R13: ffff8801d87b7820 R14: fffffffffffffff4 R15: ffff8801d87b7800
FS: 000000000207a880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
HEAD commit: d7b686ebf704 Merge branch 'i2c/for-current' of git://git.k..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=148ac149400000
kernel config: https://syzkaller.appspot.com/x/.config?x=8f59875069d721b6
dashboard link: https://syzkaller.appspot.com/bug?extid=c75f181dc8429d2eb887
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11553b7a400000
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14b16421400000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+c75f18...@syzkaller.appspotmail.com
R13: 0000000000000003 R14: 0000000000000000 R15: 0000000000000000
overlayfs: failed to clone upperpath
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
kasan: GPF could be caused by NULL-ptr deref or user memory access
CPU: 1 PID: 5473 Comm: syz-executor554 Not tainted 4.19.0-rc2+ #7
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:ovl_free_fs+0x504/0x690 fs/overlayfs/super.c:226
Google 01/01/2011
Code: 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 78 01 00 00 48
b8 00 00 00 00 00 fc ff df 4c 8b 23 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 0f
85 67 01 00 00 49 8b 3c 24 e8 c9 0a 01 00 e9 0c fc
RSP: 0018:ffff8801b3de7798 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff8801d87b7800 RCX: ffffffff828cacaf
RDX: 0000000000000000 RSI: ffffffff828cb065 RDI: 0000000000000001
RBP: ffff8801b3de77f0 R08: ffff8801c44ba680 R09: ffffed003b5e4732
R10: ffffed003b5e4732 R11: ffff8801daf23993 R12: 0000000000000000
R13: ffff8801d87b7820 R14: fffffffffffffff4 R15: ffff8801d87b7800
FS: 000000000207a880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f14a574e169 CR3: 00000001c5068000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
ovl_fill_super+0x4f4/0x40a3 fs/overlayfs/super.c:1508
mount_nodev+0x6b/0x110 fs/super.c:1204
ovl_mount+0x2c/0x40 fs/overlayfs/super.c:1516
mount_fs+0xae/0x31d fs/super.c:1261
ovl_mount+0x2c/0x40 fs/overlayfs/super.c:1516
vfs_kern_mount.part.35+0xdc/0x4f0 fs/namespace.c:961
vfs_kern_mount fs/namespace.c:951 [inline]
do_new_mount fs/namespace.c:2457 [inline]
do_mount+0x581/0x31f0 fs/namespace.c:2787
vfs_kern_mount fs/namespace.c:951 [inline]
do_new_mount fs/namespace.c:2457 [inline]
ksys_mount+0x12d/0x140 fs/namespace.c:3003
__do_sys_mount fs/namespace.c:3017 [inline]
__se_sys_mount fs/namespace.c:3014 [inline]
__x64_sys_mount+0xbe/0x150 fs/namespace.c:3014
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x445119
__do_sys_mount fs/namespace.c:3017 [inline]
__se_sys_mount fs/namespace.c:3014 [inline]
__x64_sys_mount+0xbe/0x150 fs/namespace.c:3014
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Code: ad ce 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 ce fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffef77a0948 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000445119
RDX: 00000000200000c0 RSI: 0000000020000080 RDI: 0000000000000000
RBP: 00007ffef77a0960 R08: 0000000020000100 R09: 00007ffef77f92f4
R10: 0000000000000000 R11: 0000000000000246 R12: ffffffffffffffff
R13: 0000000000000003 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
Dumping ftrace buffer:
(ftrace buffer empty)
---[ end trace 6b50ff34ce671ab8 ]---
Dumping ftrace buffer:
(ftrace buffer empty)
RIP: 0010:ovl_free_fs+0x504/0x690 fs/overlayfs/super.c:226
Code: 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 78 01 00 00 48
b8 00 00 00 00 00 fc ff df 4c 8b 23 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 0f
85 67 01 00 00 49 8b 3c 24 e8 c9 0a 01 00 e9 0c fc
RSP: 0018:ffff8801b3de7798 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff8801d87b7800 RCX: ffffffff828cacaf
RDX: 0000000000000000 RSI: ffffffff828cb065 RDI: 0000000000000001
RBP: ffff8801b3de77f0 R08: ffff8801c44ba680 R09: ffffed003b5e4732
R10: ffffed003b5e4732 R11: ffff8801daf23993 R12: 0000000000000000
R13: ffff8801d87b7820 R14: fffffffffffffff4 R15: ffff8801d87b7800
FS: 000000000207a880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f14a574e169 CR3: 00000001c5068000 CR4: 00000000001406e0
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