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Message-ID: <c5bf15c0-932c-5466-3663-92ecebab4760@kernel.org>
Date: Mon, 22 May 2023 20:44:50 +0800
From: Chao Yu <chao@...nel.org>
To: butt3rflyh4ck <butterflyhuangxx@...il.com>
Cc: linux-f2fs-devel@...ts.sourceforge.net,
LKML <linux-kernel@...r.kernel.org>,
Jaegeuk Kim <jaegeuk@...nel.org>
Subject: Re: A null-ptr-deref bug in f2fs_write_end_io
On 2023/5/22 11:58, butt3rflyh4ck wrote:
> OK, the attachment is a reproducer.
Thank you!
I've figured out a patch, could you please have a try w/ this patch?
https://lore.kernel.org/linux-f2fs-devel/20230522124203.3838360-1-chao@kernel.org/
Thanks,
>
> Regards.
> butt3rflyh4ck.
>
> On Fri, May 19, 2023 at 11:24 PM Chao Yu <chao@...nel.org> wrote:
>>
>> Hi,
>>
>> Thanks for the report, it will be helpful if you can provide a
>> reproducer.
>>
>> On 2023/5/19 15:13, butt3rflyh4ck wrote:
>>> Hi, there is a null-ptr-deref bug in f2fs_write_end_io in
>>> fs/f2fs/data.c, I reproduce it in the latest kernel too.
>>>
>>> #Quick description
>>> When a thread always calls F2FS_IOC_RESIZE_FS to resize fs, if resize
>>> fs is failed, f2fs kernel thread would invoke callback function to
>>> update
>>> f2fs io info, it would call f2fs_write_end_io and may trigger
>>> null-ptr-deref in NODE_MAPPING.
>>> ```
>>> static inline struct address_space *NODE_MAPPING(struct f2fs_sb_info *sbi)
>>> {
>>> return sbi->node_inode->i_mapping;
>>> }
>>> ```
>>> there is deref in sbi.
>>>
>>> #crash log
>>> ----------------------------------------
>>> general protection fault, probably for non-canonical address
>>> 0xdffffc0000000006: 0000 [#1] PREEMPT SMP KASAN
>>> KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]
>>> CPU: 0 PID: 17 Comm: ksoftirqd/0 Not tainted 6.4.0-rc1 #18
>>> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
>>> RIP: 0010:NODE_MAPPING fs/f2fs/f2fs.h:1972 [inline]
>>> RIP: 0010:f2fs_write_end_io+0x727/0x1050 fs/f2fs/data.c:370
>>> Code: 00 00 48 89 f8 48 c1 e8 03 80 3c 18 00 0f 85 b3 07 00 00 48 8b
>>> 44 24 08 4c 8b a8 60 01 00 00 49 8d 7d 30 48 89 f8 48 c1 e8 03 <80> 3c
>>> 18 00 0f 85 9c 07 00 00 4d 3b 75 30 0f 84 10 04 00 00 e8 10
>>> RSP: 0018:ffffc9000042fc78 EFLAGS: 00010216
>>> RAX: 0000000000000006 RBX: dffffc0000000000 RCX: 0000000000000100
>>> RDX: ffff888013d18000 RSI: ffffffff83a93a4d RDI: 0000000000000030
>>> RBP: ffffea00009e6900 R08: 0000000000000001 R09: 0000000000000000
>>> R10: 0000000000000000 R11: 0000000000000000 R12: ffffea00009e6900
>>> R13: 0000000000000000 R14: ffff88802a3cec48 R15: 0000000000000000
>>> FS: 0000000000000000(0000) GS:ffff88802ca00000(0000) knlGS:0000000000000000
>>> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>>> CR2: 0000555faf194000 CR3: 00000000251bd000 CR4: 0000000000750ef0
>>> PKRU: 55555554
>>> Call Trace:
>>> <TASK>
>>> bio_endio+0x5af/0x6c0 block/bio.c:1608
>>> req_bio_endio block/blk-mq.c:761 [inline]
>>> blk_update_request+0x5cc/0x1690 block/blk-mq.c:906
>>> blk_mq_end_request+0x59/0x4c0 block/blk-mq.c:1023
>>> lo_complete_rq+0x1c6/0x280 drivers/block/loop.c:370
>>> blk_complete_reqs+0xad/0xe0 block/blk-mq.c:1101
>>> __do_softirq+0x1d4/0x8ef kernel/softirq.c:571
>>> run_ksoftirqd kernel/softirq.c:939 [inline]
>>> run_ksoftirqd+0x31/0x60 kernel/softirq.c:931
>>> smpboot_thread_fn+0x659/0x9e0 kernel/smpboot.c:164
>>> kthread+0x33e/0x440 kernel/kthread.c:379
>>> ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
>>> </TASK>
>>> Modules linked in:
>>> ---[ end trace 0000000000000000 ]---
>>> RIP: 0010:NODE_MAPPING fs/f2fs/f2fs.h:1972 [inline]
>>> RIP: 0010:f2fs_write_end_io+0x727/0x1050 fs/f2fs/data.c:370
>>> Code: 00 00 48 89 f8 48 c1 e8 03 80 3c 18 00 0f 85 b3 07 00 00 48 8b
>>> 44 24 08 4c 8b a8 60 01 00 00 49 8d 7d 30 48 89 f8 48 c1 e8 03 <80> 3c
>>> 18 00 0f 85 9c 07 00 00 4d 3b 75 30 0f 84 10 04 00 00 e8 10
>>> RSP: 0018:ffffc9000042fc78 EFLAGS: 00010216
>>> RAX: 0000000000000006 RBX: dffffc0000000000 RCX: 0000000000000100
>>> RDX: ffff888013d18000 RSI: ffffffff83a93a4d RDI: 0000000000000030
>>> RBP: ffffea00009e6900 R08: 0000000000000001 R09: 0000000000000000
>>> R10: 0000000000000000 R11: 0000000000000000 R12: ffffea00009e6900
>>> R13: 0000000000000000 R14: ffff88802a3cec48 R15: 0000000000000000
>>> FS: 0000000000000000(0000) GS:ffff88802ca00000(0000) knlGS:0000000000000000
>>> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>>> CR2: 0000555faf194000 CR3: 00000000251bd000 CR4: 0000000000750ef0
>>> PKRU: 55555554
>>> -----------------------
>>>
>>> # new crash log in latest kernel
>>> ---------------------
>>> [ 193.695164][ T8174] loop0: detected capacity change from 0 to 264192
>>> [ 193.696467][ T8174] F2FS-fs (loop0): Magic Mismatch,
>>> valid(0xf2f52010) - read(0x0)
>>> [ 193.696875][ T8174] F2FS-fs (loop0): Can't find valid F2FS
>>> filesystem in 2th superblock
>>> [ 193.698363][ T8174] F2FS-fs (loop0): invalid crc_offset: 0
>>> [ 193.700454][ T8174] F2FS-fs (loop0): Disable nat_bits due to
>>> incorrect cp_ver (4542359912962316977, 0)
>>> [ 193.716594][ T8174] F2FS-fs (loop0): Try to recover 2th superblock, ret: 0
>>> [ 193.717102][ T8174] F2FS-fs (loop0): Mounted with checkpoint
>>> version = 3e17dab1
>>> [ 193.743330][ T8174] F2FS-fs (loop0): For resize: curseg of type 0: 46 ==> 4
>>> [ 193.743904][ T8174] F2FS-fs (loop0): For resize: curseg of type 3: 52 ==> 6
>>> [ 193.745690][ T8174] F2FS-fs (loop0): For resize: curseg of type 4: 50 ==> 8
>>> [ 193.746108][ T8174] F2FS-fs (loop0): For resize: curseg of type 5: 48 ==> 10
>>> [ 193.751857][ T8174] F2FS-fs (loop0): resize_fs failed, should run
>>> fsck to repair!
>>> [ 193.780283][ C0] general protection fault, probably for
>>> non-canonical address 0xdffffc0000000006: 0000 [#1] PREEMPT SMP KASAN
>>> [ 193.781027][ C0] KASAN: null-ptr-deref in range
>>> [0x0000000000000030-0x0000000000000037]
>>> [ 193.781572][ C0] CPU: 0 PID: 17 Comm: ksoftirqd/0 Not tainted
>>> 6.4.0-rc2-00163-g2d1bcbc6cd70-dirty #17
>>> [ 193.782201][ C0] Hardware name: QEMU Standard PC (i440FX + PIIX,
>>> 1996), BIOS 1.15.0-1 04/01/2014
>>> [ 193.782727][ C0] RIP: 0010:f2fs_write_end_io+0x727/0x1050
>>> [ 193.783083][ C0] Code: 00 00 48 89 f8 48 c1 e8 03 80 3c 18 00 0f
>>> 85 b3 07 00 00 48 8b 44 24 08 4c 8b a8 60 01 00 00 49 8d 7d 30 48 89
>>> f8 48 c1 e8 03 <80> 3c 18 00 0f 85 9c 07 00 00 4d 3b 75 30 0f 0
>>> [ 193.784268][ C0] RSP: 0018:ffffc9000042fc78 EFLAGS: 00010216
>>> [ 193.784629][ C0] RAX: 0000000000000006 RBX: dffffc0000000000
>>> RCX: 0000000000000100
>>> [ 193.785109][ C0] RDX: ffff888013d18000 RSI: ffffffff83a9588d
>>> RDI: 0000000000000030
>>> [ 193.785576][ C0] RBP: ffffea000143e740 R08: 0000000000000001
>>> R09: 0000000000000000
>>> [ 193.786051][ C0] R10: 0000000000000000 R11: 0000000000000000
>>> R12: ffffea000143e740
>>> [ 193.786571][ C0] R13: 0000000000000000 R14: ffff888041423738
>>> R15: 0000000000000000
>>> [ 193.787055][ C0] FS: 0000000000000000(0000)
>>> GS:ffff88802ca00000(0000) knlGS:0000000000000000
>>> [ 193.787620][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>>> [ 193.787997][ C0] CR2: 000056056fd87000 CR3: 000000001b546000
>>> CR4: 00000000000006f0
>>> [ 193.788585][ C0] Call Trace:
>>> [ 193.788863][ C0] <TASK>
>>> [ 193.789115][ C0] ? bio_uninit+0x1b7/0x410
>>> [ 193.789509][ C0] ? f2fs_write_end+0xa80/0xa80
>>> [ 193.790053][ C0] bio_endio+0x5af/0x6c0
>>> [ 193.790522][ C0] blk_update_request+0x5cc/0x1690
>>> [ 193.791171][ C0] blk_mq_end_request+0x59/0x4c0
>>> [ 193.791695][ C0] lo_complete_rq+0x1c6/0x280
>>> [ 193.792247][ C0] blk_complete_reqs+0xad/0xe0
>>> [ 193.792759][ C0] __do_softirq+0x1d4/0x8ef
>>> [ 193.793312][ C0] ? __irq_exit_rcu+0x190/0x190
>>> [ 193.793805][ C0] run_ksoftirqd+0x31/0x60
>>> [ 193.794183][ C0] smpboot_thread_fn+0x659/0x9e0
>>> [ 193.794576][ C0] ? sort_range+0x30/0x30
>>> [ 193.794900][ C0] kthread+0x33e/0x440
>>> [ 193.795263][ C0] ? kthread_complete_and_exit+0x40/0x40
>>> [ 193.795907][ C0] ret_from_fork+0x1f/0x30
>>> [ 193.796324][ C0] </TASK>
>>> [ 193.796689][ C0] Modules linked in:
>>> [ 193.797189][ C0] ---[ end trace 0000000000000000 ]---
>>> [ 193.797635][ C0] RIP: 0010:f2fs_write_end_io+0x727/0x1050
>>> [ 193.798182][ C0] Code: 00 00 48 89 f8 48 c1 e8 03 80 3c 18 00 0f
>>> 85 b3 07 00 00 48 8b 44 24 08 4c 8b a8 60 01 00 00 49 8d 7d 30 48 89
>>> f8 48 c1 e8 03 <80> 3c 18 00 0f 85 9c 07 00 00 4d 3b 75 30 0f 0
>>> [ 193.799559][ C0] RSP: 0018:ffffc9000042fc78 EFLAGS: 00010216
>>> [ 193.799945][ C0] RAX: 0000000000000006 RBX: dffffc0000000000
>>> RCX: 0000000000000100
>>> [ 193.800329][ C0] RDX: ffff888013d18000 RSI: ffffffff83a9588d
>>> RDI: 0000000000000030
>>> [ 193.800666][ C0] RBP: ffffea000143e740 R08: 0000000000000001
>>> R09: 0000000000000000
>>> [ 193.801047][ C0] R10: 0000000000000000 R11: 0000000000000000
>>> R12: ffffea000143e740
>>> [ 193.801503][ C0] R13: 0000000000000000 R14: ffff888041423738
>>> R15: 0000000000000000
>>> [ 193.802069][ C0] FS: 0000000000000000(0000)
>>> GS:ffff88802ca00000(0000) knlGS:0000000000000000
>>> [ 193.802804][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>>> [ 193.803356][ C0] CR2: 000056056fd87000 CR3: 000000001b546000
>>> CR4: 00000000000006f0
>>> [ 193.804046][ C0] Kernel panic - not syncing: Fatal exception in interrupt
>>> [ 193.804748][ C0] Kernel Offset: disabled
>>> [ 193.805086][ C0] Rebooting in 86400 seconds..
>>> ----------------------------
>>>
>>> If needed, I would provide reproduce.
>>>
>>> Regards,
>>> butt3rflyh4ck.
>>>
>>>
>>>
>
>
>
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