general protection fault in find_device

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syzbot

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Jun 18, 2018, 1:55:03 AM6/18/18
to c...@fb.com, dst...@suse.com, jba...@fb.com, linux...@vger.kernel.org, linux-...@vger.kernel.org, syzkall...@googlegroups.com
Hello,

syzbot found the following crash on:

HEAD commit: ce397d215ccd Linux 4.18-rc1
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14e765f8400000
kernel config: https://syzkaller.appspot.com/x/.config?x=f390986c4f7cd566
dashboard link: https://syzkaller.appspot.com/bug?extid=923aa93978c7ad27a9b1
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+923aa9...@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: 14460 Comm: syz-executor5 Not tainted 4.18.0-rc1+ #107
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:find_device+0x94/0x130 fs/btrfs/volumes.c:366
Code: 42 80 3c 28 00 0f 85 9d 00 00 00 48 8b 1b 4c 39 f3 0f 84 86 00 00 00
e8 6a 79 b1 fe 48 8d bb c0 00 00 00 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00
75 70 4c 8b bb c0 00 00 00 4c 89 e6 4c 89 ff e8 f3
RSP: 0018:ffff8801d880ee70 EFLAGS: 00010206
RAX: 0000000000000018 RBX: 0000000000000000 RCX: ffffc9000d8a5000
RDX: 0000000000002d14 RSI: ffffffff82ca3136 RDI: 00000000000000c0
RBP: ffff8801d880eea8 R08: ffff8801abee0240 R09: fffffbfff123dea8
R10: ffff8801d880f178 R11: ffffffff891ef547 R12: 231f7dc339e55e1c
R13: dffffc0000000000 R14: ffff8801d7a65b98 R15: 0000000000000000
FS: 00007faa9dcb2700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000093002d CR3: 00000001bd208000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
device_list_add+0x230/0x1530 fs/btrfs/volumes.c:771
btrfs_scan_one_device+0x474/0xb00 fs/btrfs/volumes.c:1247
btrfs_mount_root+0x3ae/0x1e90 fs/btrfs/super.c:1542
mount_fs+0xae/0x328 fs/super.c:1277
vfs_kern_mount.part.34+0xdc/0x4e0 fs/namespace.c:1037
vfs_kern_mount+0x40/0x60 fs/namespace.c:1027
btrfs_mount+0x4a9/0x215e fs/btrfs/super.c:1661
mount_fs+0xae/0x328 fs/super.c:1277
vfs_kern_mount.part.34+0xdc/0x4e0 fs/namespace.c:1037
vfs_kern_mount fs/namespace.c:1027 [inline]
do_new_mount fs/namespace.c:2518 [inline]
do_mount+0x581/0x30e0 fs/namespace.c:2848
ksys_mount+0x12d/0x140 fs/namespace.c:3064
__do_sys_mount fs/namespace.c:3078 [inline]
__se_sys_mount fs/namespace.c:3075 [inline]
__x64_sys_mount+0xbe/0x150 fs/namespace.c:3075
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45855a
Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 dd 8f fb ff c3 66 2e 0f
1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff
ff 0f 83 ba 8f fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007faa9dcb1a88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000020000428 RCX: 000000000045855a
RDX: 00007faa9dcb1ad0 RSI: 00000000200000c0 RDI: 00007faa9dcb1af0
RBP: 0000000000000001 R08: 00007faa9dcb1b30 R09: 00007faa9dcb1ad0
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000013
R13: 0000000000000001 R14: 00000000004d2d78 R15: 0000000000000000
Modules linked in:
Dumping ftrace buffer:
---------------------------------
syz-exec-17250 0...2 227741094us : 0: }D
syz-exec-17250 0...2 227741101us : 0: }D
syz-exec-17250 0...2 227741106us : 0: }D
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syz-exec-17250 0...2 227741112us : 0: }D
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syz-exec-17250 0...2 227798349us : 0: }D
syz-exec-17250 0...2 227798353us : 0: }D
syz-exec-17250 0...2 227798356us : 0: }D
syz-exec-17250 0...2 227798359us : 0: }D
syz-exec-17250 0...2 227798362us : 0: }D
syz-exec-17250 0...2 227798367us : 0: }D
syz-exec-17250 0...2 227798369us : 0: }D
syz-exec-17250 0...2 227798372us : 0: }D
syz-exec-17250 0...2 227798376us : 0: }D
syz-exec-17250 0...2 227798379us : 0: }D
syz-exec-17250 0...2 227798382us : 0: }D
syz-exec-17250 0...2 227798385us : 0: }D
syz-exec-17250 0...2 227798389us : 0: }D
syz-exec-17250 0...2 227798391us : 0: }D
syz-exec-17250 0...2 227798394us : 0: }D
syz-exec-17250 0...2 227798397us : 0: }D
syz-exec-17250 0...2 227798401us : 0: }D
syz-exec-17250 0...2 227798403us : 0: }D
syz-exec-17250 0...2 227798406us : 0: }D
syz-exec-17250 0...2 227798410us : 0: }D
syz-exec-17250 0...2 227798414us : 0: }D
syz-exec-17250 0...2 227798417us : 0: }D
syz-exec-17250 0...2 227798419us : 0: }D
syz-exec-17250 0...2 227798422us : 0: }D
syz-exec-17250 0...2 227798425us : 0: }D
syz-exec-17250 0...2 227798428us : 0: }D
syz-exec-17250 0...2 227798431us : 0: }D
syz-exec-17250 0...2 227798434us : 0: }D
syz-exec-17250 0...2 227798436us : 0: }D
syz-exec-17250 0...2 227798439us : 0: }D
syz-exec-17250 0...2 227798442us : 0: }D
syz-exec-17250 0...2 227798445us : 0: }D
syz-exec-17250 0...2 227798448us : 0: }D
syz-exec-17250 0...2 227798450us : 0: }D
syz-exec-17250 0.

---
This bug is generated by a bot. It may contain errors.
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Nikolay Borisov

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Jun 18, 2018, 3:03:22 AM6/18/18
to c...@fb.com, dst...@suse.com, jba...@fb.com, linux...@vger.kernel.org, linux-...@vger.kernel.org, syzkall...@googlegroups.com
[Adding Anand to CC list since he's been doing devices-related work]
So this suggests some inconsistency on fs_devices->devices list. On a
quick look indeed it doesn't seem clear what the locking rules for this
list are. In device_list_add in the !device case a device is added with
fs_devices->device_list_Mutex held and using list_add_rcu. In the same
function if we want to read the list ie invoke find_devices (because we
have found an fsid) we are using plain list_for_each_entry (ie not the
_rcu version and i don't see device_list_mutex being held while
iterating the list). Additionally in btrfs_free_extra_devids the
fs_devices->devices list is iterated with uuid_mutex being held and not
device_list_mutex. In open_fs_devices we don't get any protection
whatsoever while reading the list. Same thing in
btrfs_find_next_active_device. If the list is supposed to be
RCU-protected then the rules are:

1. There needs to be an out of band (ie not RCU) mutual exclusion of
modifiers
2. Iterating the list should use _rcu list primitives.

Currently I don't see those 2 invariants being enforced in every code path.

Nikolay Borisov

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Jun 18, 2018, 4:26:33 AM6/18/18
to c...@fb.com, dst...@suse.com, jba...@fb.com, linux...@vger.kernel.org, linux-...@vger.kernel.org, syzkall...@googlegroups.com, Anand Jain
[Actually adding Anand to CC, Anand see my analysis of the issue below
from previous email]
> --
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>

David Sterba

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Jun 18, 2018, 9:35:22 AM6/18/18
to Nikolay Borisov, c...@fb.com, dst...@suse.com, jba...@fb.com, linux...@vger.kernel.org, linux-...@vger.kernel.org, syzkall...@googlegroups.com, anand...@oracle.com
On Mon, Jun 18, 2018 at 10:03:18AM +0300, Nikolay Borisov wrote:
> So this suggests some inconsistency on fs_devices->devices list. On a
> quick look indeed it doesn't seem clear what the locking rules for this
> list are. In device_list_add in the !device case a device is added with
> fs_devices->device_list_Mutex held and using list_add_rcu. In the same
> function if we want to read the list ie invoke find_devices (because we
> have found an fsid) we are using plain list_for_each_entry (ie not the
> _rcu version and i don't see device_list_mutex being held while
> iterating the list). Additionally in btrfs_free_extra_devids the
> fs_devices->devices list is iterated with uuid_mutex being held and not
> device_list_mutex. In open_fs_devices we don't get any protection
> whatsoever while reading the list.

The uuid_mutex or device_list_mutex is provided by a caller up the
stack.

> Same thing in
> btrfs_find_next_active_device. If the list is supposed to be
> RCU-protected then the rules are:
>
> 1. There needs to be an out of band (ie not RCU) mutual exclusion of
> modifiers

that's device_list_mutex for fs_devices::devices

> 2. Iterating the list should use _rcu list primitives.
>
> Currently I don't see those 2 invariants being enforced in every code path.

Where is it not enforced for example?

If the device_list_mutex is held, list traversal does not use
list_for_each_entry_rcu, otherwise it does (eg the DEV_INFO ioctl or
btrfs_show_devname).

The problem that triggers this report is IMO in device_list_add that
uses the device list unprotected. Anand sent patches for that, but they
were titled as 'cleanups' so I skipped them for the merge window.

Candidate fixes are:

https://patchwork.kernel.org/patch/10437705/
https://patchwork.kernel.org/patch/10437713/

Nikolay Borisov

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Jun 18, 2018, 9:43:42 AM6/18/18
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On 18.06.2018 16:32, David Sterba wrote:
> On Mon, Jun 18, 2018 at 10:03:18AM +0300, Nikolay Borisov wrote:
>> So this suggests some inconsistency on fs_devices->devices list. On a
>> quick look indeed it doesn't seem clear what the locking rules for this
>> list are. In device_list_add in the !device case a device is added with
>> fs_devices->device_list_Mutex held and using list_add_rcu. In the same
>> function if we want to read the list ie invoke find_devices (because we
>> have found an fsid) we are using plain list_for_each_entry (ie not the
>> _rcu version and i don't see device_list_mutex being held while
>> iterating the list). Additionally in btrfs_free_extra_devids the
>> fs_devices->devices list is iterated with uuid_mutex being held and not
>> device_list_mutex. In open_fs_devices we don't get any protection
>> whatsoever while reading the list.
>
> The uuid_mutex or device_list_mutex is provided by a caller up the
> stack.
>
>> Same thing in
>> btrfs_find_next_active_device. If the list is supposed to be
>> RCU-protected then the rules are:
>>
>> 1. There needs to be an out of band (ie not RCU) mutual exclusion of
>> modifiers
>
> that's device_list_mutex for fs_devices::devices
>
>> 2. Iterating the list should use _rcu list primitives.
>>
>> Currently I don't see those 2 invariants being enforced in every code path.
>
> Where is it not enforced for example?

Admittedly I didn't check the whole call chain but for example in
find_device it's used "naked". Perhaps putting some lockdep_assert in
various places dealing with fs_devices->devices list would help ?
>
> If the device_list_mutex is held, list traversal does not use
> list_for_each_entry_rcu, otherwise it does (eg the DEV_INFO ioctl or
> btrfs_show_devname).
>
> The problem that triggers this report is IMO in device_list_add that
> uses the device list unprotected. Anand sent patches for that, but they
> were titled as 'cleanups' so I skipped them for the merge window.
>
> Candidate fixes are:
>
> https://patchwork.kernel.org/patch/10437705/
> https://patchwork.kernel.org/patch/10437713/
Yep those 2 definitely look like fixing unlocked accesses to
fs_devices->devices list
>

Anand Jain

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Jun 26, 2018, 5:14:46 AM6/26/18
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(Sorry for the delay in replay due to my vacation).

Thanks Nikolay. more below.
Ah. sorry to confuse you. Will consolidate fixes into github
(also reviewing David's fixes as well) and will use syz to confirm.

Thanks, Anand

>> Candidate fixes are:
>>
>> https://patchwork.kernel.org/patch/10437705/
>> https://patchwork.kernel.org/patch/10437713/
> Yep those 2 definitely look like fixing unlocked accesses to
> fs_devices->devices list


>>

syzbot

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Feb 22, 2019, 5:34:44 AM2/22/19
to syzkall...@googlegroups.com
Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.
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