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Message-ID: <CAAeHK+y_1CuCCMDz+sbwS0zG=G9tWvfcFunqgmY8UtR_D=xMww@mail.gmail.com>
Date:   Thu, 3 Nov 2016 03:36:05 +0100
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        David Decotigny <decot@...glers.com>,
        "David S. Miller" <davem@...emloft.net>,
        Dmitry Ivanov <dmitrijs.ivanovs@...t.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Florian Westphal <fw@...len.de>,
        Greg Rose <grose@...htfleet.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Johannes Berg <johannes.berg@...el.com>,
        Matti Vaittinen <matti.vaittinen@...ia.com>,
        Pravin B Shelar <pshelar@....org>,
        stephen hemminger <stephen@...workplumber.org>,
        Tom Herbert <tom@...bertland.com>,
        Tycho Andersen <tycho.andersen@...onical.com>,
        LKML <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>
Cc:     syzkaller <syzkaller@...glegroups.com>,
        Kostya Serebryany <kcc@...gle.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>
Subject: Re: net/netlink: null-ptr-deref in netlink_dump/lock_acquire

On Thu, Nov 3, 2016 at 1:15 AM, Andrey Konovalov <andreyknvl@...gle.com> wrote:
> On Wed, Oct 19, 2016 at 4:13 PM, Andrey Konovalov <andreyknvl@...gle.com> wrote:
>> Hi,
>>
>> I've got the following error report while running the syzkaller fuzzer:
>>
>> 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
>> Modules linked in:
>> CPU: 1 PID: 3933 Comm: syz-executor Not tainted 4.9.0-rc1+ #230
>> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
>> task: ffff88006b79d800 task.stack: ffff88006bbc0000
>> RIP: 0010:[<ffffffff8120872d>]  [<ffffffff8120872d>]
>> __lock_acquire+0x12d/0x3450 kernel/locking/lockdep.c:3221
>> RSP: 0018:ffff88006bbc7420  EFLAGS: 00010006
>> RAX: 0000000000000046 RBX: dffffc0000000000 RCX: 0000000000000000
>> RDX: 000000000000000c RSI: 0000000000000000 RDI: 0000000000000003
>> RBP: ffff88006bbc75c0 R08: 0000000000000001 R09: 0000000000000000
>> R10: 0000000000000000 R11: ffffffff85f42240 R12: ffff88006b79d800
>> R13: ffffffff84bfe4e0 R14: 0000000000000001 R15: 0000000000000060
>> FS:  00007fd9c41cc700(0000) GS:ffff88006cd00000(0000) knlGS:0000000000000000
>> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> CR2: 0000000000451f80 CR3: 00000000638f0000 CR4: 00000000000006e0
>> Stack:
>>  0000000000000000 ffff88006bbc0000 ffff88006bbc8000 0000000000000000
>>  0000000000000002 ffff88006b79d800 0000000000000000 ffff88006bbc7f48
>>  ffffffff852adc60 0000000000000000 ffffffff852adc64 1ffffffff0b40135
>> Call Trace:
>>  [<ffffffff8120c5ae>] lock_acquire+0x17e/0x340 kernel/locking/lockdep.c:3746
>>  [<     inline     >] __mutex_lock_common kernel/locking/mutex.c:521
>>  [<ffffffff83fb6fe1>] mutex_lock_nested+0xb1/0x890 kernel/locking/mutex.c:621
>>  [<ffffffff82db6fd0>] netlink_dump+0x50/0xac0 net/netlink/af_netlink.c:2067
>>  [<ffffffff82dba381>] __netlink_dump_start+0x501/0x770
>> net/netlink/af_netlink.c:2200
>>  [<ffffffff82dc35b2>] genl_family_rcv_msg+0xa02/0xc80
>> net/netlink/genetlink.c:595
>>  [<ffffffff82dc39e6>] genl_rcv_msg+0x1b6/0x270 net/netlink/genetlink.c:658
>>  [<ffffffff82dc1a70>] netlink_rcv_skb+0x2c0/0x3b0 net/netlink/af_netlink.c:2281
>>  [<ffffffff82dc2b98>] genl_rcv+0x28/0x40 net/netlink/genetlink.c:669
>>  [<     inline     >] netlink_unicast_kernel net/netlink/af_netlink.c:1214
>>  [<ffffffff82dc0329>] netlink_unicast+0x5a9/0x880 net/netlink/af_netlink.c:1240
>>  [<ffffffff82dc0fb7>] netlink_sendmsg+0x9b7/0xce0 net/netlink/af_netlink.c:1786
>>  [<     inline     >] sock_sendmsg_nosec net/socket.c:606
>>  [<ffffffff82b7075c>] sock_sendmsg+0xcc/0x110 net/socket.c:616
>>  [<ffffffff82b709c1>] sock_write_iter+0x221/0x3b0 net/socket.c:814
>>  [<     inline     >] new_sync_write fs/read_write.c:499
>>  [<ffffffff8151c944>] __vfs_write+0x334/0x570 fs/read_write.c:512
>>  [<ffffffff8152045b>] vfs_write+0x17b/0x500 fs/read_write.c:560
>>  [<     inline     >] SYSC_write fs/read_write.c:607
>>  [<ffffffff81523d84>] SyS_write+0xd4/0x1a0 fs/read_write.c:599
>>  [<ffffffff83fc0141>] entry_SYSCALL_64_fastpath+0x1f/0xc2
>> arch/x86/entry/entry_64.S:209
>> Code: 0f 1f 44 00 00 f6 c4 02 0f 85 24 0a 00 00 44 8b 35 c9 61 8b 03
>> 45 85 f6 74 2c 4c 89 fa 48 bb 00 00 00 00 00 fc ff df 48 c1 ea 03 <80>
>> 3c 1a 00 0f 85 04 2f 00 00 49 81 3f a0 dc 2a 85 41 be 00 00
>> RIP  [<ffffffff8120872d>] __lock_acquire+0x12d/0x3450
>> kernel/locking/lockdep.c:3221
>>  RSP <ffff88006bbc7420>
>> ---[ end trace 685b3c182bf7f25c ]---
>>
>> The reproducer is attached.
>>
>> On commit 1a1891d762d6e64daf07b5be4817e3fbb29e3c59 (Oct 18).
>
> (Adding more maintainers)
>
> Still seeing this on 0c183d92b20b5c84ca655b45ef57b3318b83eb9e (Oct 31).

Here is another report that might be related:

=====================================
[ BUG: bad unlock balance detected! ]
4.9.0-rc3+ #336 Not tainted
-------------------------------------
syz-executor/4018 is trying to release lock ([   36.220068] nl_table_lock
) at:
[<ffffffff82dc8683>] netlink_diag_dump+0x1a3/0x250 net/netlink/diag.c:182
but there are no more locks to release!

other info that might help us debug this:
3 locks held by syz-executor/4018:
 #0: [   36.220068]  (
sock_diag_mutex[   36.220068] ){+.+.+.}
, at: [   36.220068] [<ffffffff82c3873b>] sock_diag_rcv+0x1b/0x40
 #1: [   36.220068]  (
sock_diag_table_mutex[   36.220068] ){+.+.+.}
, at: [   36.220068] [<ffffffff82c38e00>] sock_diag_rcv_msg+0x140/0x3a0
 #2: [   36.220068]  (
nlk->cb_mutex[   36.220068] ){+.+.+.}
, at: [   36.220068] [<ffffffff82db6600>] netlink_dump+0x50/0xac0

stack backtrace:
CPU: 1 PID: 4018 Comm: syz-executor Not tainted 4.9.0-rc3+ #336
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
 ffff8800645df688 ffffffff81b46934 ffffffff84eb3e78 ffff88006ad85800
 ffffffff82dc8683 ffffffff84eb3e78 ffff8800645df6b8 ffffffff812043ca
 dffffc0000000000 ffff88006ad85ff8 ffff88006ad85fd0 00000000ffffffff
Call Trace:
 [<     inline     >] __dump_stack lib/dump_stack.c:15
 [<ffffffff81b46934>] dump_stack+0xb3/0x10f lib/dump_stack.c:51
 [<ffffffff812043ca>] print_unlock_imbalance_bug+0x17a/0x1a0
kernel/locking/lockdep.c:3388
 [<     inline     >] __lock_release kernel/locking/lockdep.c:3512
 [<ffffffff8120cfd8>] lock_release+0x8e8/0xc60 kernel/locking/lockdep.c:3765
 [<     inline     >] __raw_read_unlock ./include/linux/rwlock_api_smp.h:225
 [<ffffffff83fc001a>] _raw_read_unlock+0x1a/0x30 kernel/locking/spinlock.c:255
 [<ffffffff82dc8683>] netlink_diag_dump+0x1a3/0x250 net/netlink/diag.c:182
 [<ffffffff82db6947>] netlink_dump+0x397/0xac0 net/netlink/af_netlink.c:2110
 [<ffffffff82db99b1>] __netlink_dump_start+0x501/0x770
net/netlink/af_netlink.c:2200
 [<     inline     >] netlink_dump_start ./include/linux/netlink.h:165
 [<ffffffff82dc75d1>] netlink_diag_handler_dump+0x191/0x220
net/netlink/diag.c:218
 [<     inline     >] __sock_diag_cmd net/core/sock_diag.c:239
 [<ffffffff82c38fd6>] sock_diag_rcv_msg+0x316/0x3a0 net/core/sock_diag.c:270
 [<ffffffff82dc10a0>] netlink_rcv_skb+0x2c0/0x3b0 net/netlink/af_netlink.c:2281
 [<ffffffff82c3874a>] sock_diag_rcv+0x2a/0x40 net/core/sock_diag.c:281
 [<     inline     >] netlink_unicast_kernel net/netlink/af_netlink.c:1214
 [<ffffffff82dbf959>] netlink_unicast+0x5a9/0x880 net/netlink/af_netlink.c:1240
 [<ffffffff82dc05e7>] netlink_sendmsg+0x9b7/0xce0 net/netlink/af_netlink.c:1786
 [<     inline     >] sock_sendmsg_nosec net/socket.c:606
 [<ffffffff82b6f75c>] sock_sendmsg+0xcc/0x110 net/socket.c:616
 [<ffffffff82b6f9c1>] sock_write_iter+0x221/0x3b0 net/socket.c:814
 [<     inline     >] new_sync_write fs/read_write.c:499
 [<ffffffff8151bd44>] __vfs_write+0x334/0x570 fs/read_write.c:512
 [<ffffffff8151f85b>] vfs_write+0x17b/0x500 fs/read_write.c:560
 [<     inline     >] SYSC_write fs/read_write.c:607
 [<ffffffff81523184>] SyS_write+0xd4/0x1a0 fs/read_write.c:599
 [<ffffffff83fc0401>] entry_SYSCALL_64_fastpath+0x1f/0xc2
arch/x86/entry/entry_64.S:209
------------[ cut here ]------------
WARNING: CPU: 1 PID: 4018 at net/core/skbuff.c:654[<        none
 >] skb_release_head_state+0x1ca/0x240 net/core/skbuff.c:654
Modules linked in:
CPU: 1 PID: 4018 Comm: syz-executor Not tainted 4.9.0-rc3+ #336
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
 ffff8800645df920 ffffffff81b46934 0000000000000000 0000000000000000
 ffffffff84401fa0 0000000000000000 ffff8800645df968 ffffffff811112f7
 ffffffff83fb92f2 ffff88000000028e ffffffff84401fa0 000000000000028e
Call Trace:
 [<     inline     >] __dump_stack lib/dump_stack.c:15
 [<ffffffff81b46934>] dump_stack+0xb3/0x10f lib/dump_stack.c:51
 [<ffffffff811112f7>] __warn+0x1a7/0x1f0 kernel/panic.c:550
 [<ffffffff8111150c>] warn_slowpath_null+0x2c/0x40 kernel/panic.c:585
 [<ffffffff82b885ea>] skb_release_head_state+0x1ca/0x240 net/core/skbuff.c:654
 [<ffffffff82b91815>] skb_release_all+0x15/0x60 net/core/skbuff.c:668
 [<     inline     >] __kfree_skb net/core/skbuff.c:684
 [<ffffffff82ba0175>] consume_skb+0x115/0x2e0 net/core/skbuff.c:757
 [<     inline     >] netlink_unicast_kernel net/netlink/af_netlink.c:1215
 [<ffffffff82dbf961>] netlink_unicast+0x5b1/0x880 net/netlink/af_netlink.c:1240
 [<ffffffff82dc05e7>] netlink_sendmsg+0x9b7/0xce0 net/netlink/af_netlink.c:1786
 [<     inline     >] sock_sendmsg_nosec net/socket.c:606
 [<ffffffff82b6f75c>] sock_sendmsg+0xcc/0x110 net/socket.c:616
 [<ffffffff82b6f9c1>] sock_write_iter+0x221/0x3b0 net/socket.c:814
 [<     inline     >] new_sync_write fs/read_write.c:499
 [<ffffffff8151bd44>] __vfs_write+0x334/0x570 fs/read_write.c:512
 [<ffffffff8151f85b>] vfs_write+0x17b/0x500 fs/read_write.c:560
 [<     inline     >] SYSC_write fs/read_write.c:607
 [<ffffffff81523184>] SyS_write+0xd4/0x1a0 fs/read_write.c:599
 [<ffffffff83fc0401>] entry_SYSCALL_64_fastpath+0x1f/0xc2
arch/x86/entry/entry_64.S:209
---[ end trace bb9fa7cf182d59a5 ]---
BUG: scheduling while atomic: syz-executor/4018/0x7fffffff
INFO: lockdep is turned off.
Modules linked in:
CPU: 1 PID: 4018 Comm: syz-executor Tainted: G        W       4.9.0-rc3+ #336
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
 ffff8800645dfe28 ffffffff81b46934 dffffc0000000000 000000007fffffff
 00000000000214c0 0000000000000001 ffff8800645dfe48 ffffffff8119113a
 ffff88006cd214c0 0000000000000000 ffff8800645dfec8 ffffffff83fb030a
Call Trace:
 [<     inline     >] __dump_stack lib/dump_stack.c:15
 [<ffffffff81b46934>] dump_stack+0xb3/0x10f lib/dump_stack.c:51
 [<ffffffff8119113a>] __schedule_bug+0xfa/0x140 kernel/sched/core.c:3230
 [<     inline     >] schedule_debug kernel/sched/core.c:3245
 [<ffffffff83fb030a>] __schedule+0xfda/0x1ab0 kernel/sched/core.c:3345
 [<ffffffff83fb0e70>] schedule+0x90/0x1b0 kernel/sched/core.c:3457
 [<ffffffff810039e9>] exit_to_usermode_loop+0xc9/0x130
arch/x86/entry/common.c:149
 [<     inline     >] prepare_exit_to_usermode arch/x86/entry/common.c:190
 [<ffffffff81006298>] syscall_return_slowpath+0x1a8/0x1e0
arch/x86/entry/common.c:259
 [<ffffffff83fc04a2>] entry_SYSCALL_64_fastpath+0xc0/0xc2
arch/x86/entry/entry_64.S:244
NOHZ: local_softirq_pending 202
------------[ cut here ]------------
WARNING: CPU: 1 PID: 4018 at net/core/skbuff.c:654[<        none
 >] skb_release_head_state+0x1ca/0x240 net/core/skbuff.c:654
Modules linked in:[   36.328353] CPU: 1 PID: 4018 Comm: syz-executor
Tainted: G        W       4.9.0-rc3+ #336
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
 ffff8800645df920 ffffffff81b46934 0000000000000000 0000000000000000
 ffffffff84401fa0 0000000000000000 ffff8800645df968 ffffffff811112f7
 ffffffff83fb92f2 ffff88000000028e ffffffff84401fa0 000000000000028e
Call Trace:
 [<     inline     >] __dump_stack lib/dump_stack.c:15
 [<ffffffff81b46934>] dump_stack+0xb3/0x10f lib/dump_stack.c:51
 [<ffffffff811112f7>] __warn+0x1a7/0x1f0 kernel/panic.c:550
 [<ffffffff8111150c>] warn_slowpath_null+0x2c/0x40 kernel/panic.c:585
 [<ffffffff82b885ea>] skb_release_head_state+0x1ca/0x240 net/core/skbuff.c:654
 [<ffffffff82b91815>] skb_release_all+0x15/0x60 net/core/skbuff.c:668
 [<     inline     >] __kfree_skb net/core/skbuff.c:684
 [<ffffffff82ba0175>] consume_skb+0x115/0x2e0 net/core/skbuff.c:757
 [<     inline     >] netlink_unicast_kernel net/netlink/af_netlink.c:1215
 [<ffffffff82dbf961>] netlink_unicast+0x5b1/0x880 net/netlink/af_netlink.c:1240
 [<ffffffff82dc05e7>] netlink_sendmsg+0x9b7/0xce0 net/netlink/af_netlink.c:1786
 [<     inline     >] sock_sendmsg_nosec net/socket.c:606
 [<ffffffff82b6f75c>] sock_sendmsg+0xcc/0x110 net/socket.c:616
 [<ffffffff82b6f9c1>] sock_write_iter+0x221/0x3b0 net/socket.c:814
 [<     inline     >] new_sync_write fs/read_write.c:499
 [<ffffffff8151bd44>] __vfs_write+0x334/0x570 fs/read_write.c:512
 [<ffffffff8151f85b>] vfs_write+0x17b/0x500 fs/read_write.c:560
 [<     inline     >] SYSC_write fs/read_write.c:607
 [<ffffffff81523184>] SyS_write+0xd4/0x1a0 fs/read_write.c:599
 [<ffffffff83fc0401>] entry_SYSCALL_64_fastpath+0x1f/0xc2
arch/x86/entry/entry_64.S:209
---[ end trace bb9fa7cf182d59a6 ]---
BUG: sleeping function called from invalid context at
./include/linux/freezer.h:56
in_atomic(): 1, irqs_disabled(): 0, pid: 4018, name: syz-executor
INFO: lockdep is turned off.
CPU: 1 PID: 4018 Comm: syz-executor Tainted: G        W       4.9.0-rc3+ #336
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
 ffff8800645dfbb0 ffffffff81b46934 ffff88006ad85800 ffff8800645d8000
 ffff88006ad85800 0000000000000000 ffff8800645dfbd8 ffffffff81192131
 ffff88006ad85800 ffffffff8404c140 0000000000000038 ffff8800645dfc18
Call Trace:
 [<     inline     >] __dump_stack lib/dump_stack.c:15
 [<ffffffff81b46934>] dump_stack+0xb3/0x10f lib/dump_stack.c:51
 [<ffffffff81192131>] ___might_sleep+0x281/0x3c0 kernel/sched/core.c:7767
 [<ffffffff81192306>] __might_sleep+0x96/0x1a0 kernel/sched/core.c:7726
 [<     inline     >] try_to_freeze_unsafe ./include/linux/freezer.h:56
 [<     inline     >] try_to_freeze ./include/linux/freezer.h:66
 [<ffffffff81143849>] get_signal+0x129/0x15a0 kernel/signal.c:2147
 [<ffffffff81054aad>] do_signal+0x8d/0x1a30 arch/x86/kernel/signal.c:807
 [<ffffffff81003a05>] exit_to_usermode_loop+0xe5/0x130
arch/x86/entry/common.c:156
 [<     inline     >] prepare_exit_to_usermode arch/x86/entry/common.c:190
 [<ffffffff81006298>] syscall_return_slowpath+0x1a8/0x1e0
arch/x86/entry/common.c:259
 [<ffffffff83fc04a2>] entry_SYSCALL_64_fastpath+0xc0/0xc2
arch/x86/entry/entry_64.S:244
Kernel panic - not syncing: Aiee, killing interrupt handler!
CPU: 1 PID: 4018 Comm: syz-executor Tainted: G        W       4.9.0-rc3+ #336
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
 ffff8800645df998 ffffffff81b46934 0000000000000003 dffffc0000000000
 dffffc0000000000 ffff8800645dfa04 ffff8800645dfa60 ffffffff8140bf7a
 0000000041b58ab3 ffffffff84797a7d ffffffff8140bdbe ffffffff00000000
Call Trace:
 [<     inline     >] __dump_stack lib/dump_stack.c:15
 [<ffffffff81b46934>] dump_stack+0xb3/0x10f lib/dump_stack.c:51
 [<ffffffff8140bf7a>] panic+0x1bc/0x39d kernel/panic.c:179
 [<ffffffff8111cfd8>] do_exit+0x1b48/0x2ac0 kernel/exit.c:740
 [<ffffffff811222be>] do_group_exit+0x10e/0x340 kernel/exit.c:931
 [<ffffffff81143d54>] get_signal+0x634/0x15a0 kernel/signal.c:2307
 [<ffffffff81054aad>] do_signal+0x8d/0x1a30 arch/x86/kernel/signal.c:807
 [<ffffffff81003a05>] exit_to_usermode_loop+0xe5/0x130
arch/x86/entry/common.c:156
 [<     inline     >] prepare_exit_to_usermode arch/x86/entry/common.c:190
 [<ffffffff81006298>] syscall_return_slowpath+0x1a8/0x1e0
arch/x86/entry/common.c:259
 [<ffffffff83fc04a2>] entry_SYSCALL_64_fastpath+0xc0/0xc2
arch/x86/entry/entry_64.S:244
Kernel Offset: disabled
---[ end Kernel panic - not syncing: Aiee, killing interrupt handler!

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