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Message-ID: <ae12d2ad-6f7f-09d4-30ba-03411c4dae66@google.com>
Date: Mon, 19 Feb 2024 20:26:20 -0800 (PST)
From: Hugh Dickins <hughd@...gle.com>
To: Carlos Maiolino <cem@...nel.org>
cc: linux-kernel <linux-kernel@...r.kernel.org>,
linux-trace-kernel <linux-trace-kernel@...r.kernel.org>,
linux-mm <linux-mm@...ck.org>, Andrew Morton <akpm@...ux-foundation.org>,
Hugh Dickins <hughd@...gle.com>, Jan Kara <jack@...e.cz>,
Ubisectech Sirius <bugreport@...sectech.com>
Subject: Re: WARNING in shmem_release_dquot
On Mon, 29 Jan 2024, Ubisectech Sirius wrote:
> Hello.
> We are Ubisectech Sirius Team, the vulnerability lab of China ValiantSec. Recently, our team has discovered a issue in Linux kernel 6.8.0-rc1-gecb1b8288dc7. Attached to the email were a POC file of the issue.
>
> Stack dump:
> [ 246.195553][ T4096] ------------[ cut here ]------------
> [ 246.196540][ T4096] quota id 16384 from dquot ffff888051bd3000, not in rb tree!
> [ 246.198829][ T4096] WARNING: CPU: 1 PID: 4096 at mm/shmem_quota.c:290 shmem_release_dquot (mm/shmem_quota.c:290 (discriminator 3))
> [ 246.199955][ T4096] Modules linked in:
> [ 246.200435][ T4096] CPU: 1 PID: 4096 Comm: kworker/u6:6 Not tainted 6.8.0-rc1-gecb1b8288dc7 #21
> [ 246.201566][ T4096] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
> [ 246.202667][ T4096] Workqueue: events_unbound quota_release_workfn
> [ 246.203516][ T4096] RIP: 0010:shmem_release_dquot (mm/shmem_quota.c:290 (discriminator 3))
> [ 246.204276][ T4096] Code: e8 28 d9 18 00 e9 b3 f8 ff ff e8 6e e1 c2 ff c6 05 bf e8 1b 0d 01 90 48 c7 c7 80 f0 b8 8a 4c 89 ea 44 89 e6 e8 14 6d 89 ff 90 <0f> 0b 90 90 e9 18 fb ff ff e8 f5 d8 18 00 e9 a2 fa ff ff e8 0b d9
> All code
> ========
> 0: e8 28 d9 18 00 call 0x18d92d
> 5: e9 b3 f8 ff ff jmp 0xfffffffffffff8bd
> a: e8 6e e1 c2 ff call 0xffffffffffc2e17d
> f: c6 05 bf e8 1b 0d 01 movb $0x1,0xd1be8bf(%rip) # 0xd1be8d5
> 16: 90 nop
> 17: 48 c7 c7 80 f0 b8 8a mov $0xffffffff8ab8f080,%rdi
> 1e: 4c 89 ea mov %r13,%rdx
> 21: 44 89 e6 mov %r12d,%esi
> 24: e8 14 6d 89 ff call 0xffffffffff896d3d
> 29: 90 nop
> 2a:* 0f 0b ud2 <-- trapping instruction
> 2c: 90 nop
> 2d: 90 nop
> 2e: e9 18 fb ff ff jmp 0xfffffffffffffb4b
> 33: e8 f5 d8 18 00 call 0x18d92d
> 38: e9 a2 fa ff ff jmp 0xfffffffffffffadf
> 3d: e8 .byte 0xe8
> 3e: 0b d9 or %ecx,%ebx
>
> Code starting with the faulting instruction
> ===========================================
> 0: 0f 0b ud2
> 2: 90 nop
> 3: 90 nop
> 4: e9 18 fb ff ff jmp 0xfffffffffffffb21
> 9: e8 f5 d8 18 00 call 0x18d903
> e: e9 a2 fa ff ff jmp 0xfffffffffffffab5
> 13: e8 .byte 0xe8
> 14: 0b d9 or %ecx,%ebx
> [ 246.206640][ T4096] RSP: 0018:ffffc9000604fbc0 EFLAGS: 00010286
> [ 246.207403][ T4096] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff814c77da
> [ 246.208514][ T4096] RDX: ffff888049a58000 RSI: ffffffff814c77e7 RDI: 0000000000000001
> [ 246.209429][ T4096] RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
> [ 246.210362][ T4096] R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000004000
> [ 246.211367][ T4096] R13: ffff888051bd3000 R14: dffffc0000000000 R15: ffff888051bd3040
> [ 246.212327][ T4096] FS: 0000000000000000(0000) GS:ffff88807ec00000(0000) knlGS:0000000000000000
> [ 246.213387][ T4096] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 246.214232][ T4096] CR2: 00007ffee748ec80 CR3: 000000000cb78000 CR4: 0000000000750ef0
> [ 246.215216][ T4096] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [ 246.216187][ T4096] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> [ 246.217148][ T4096] PKRU: 55555554
> [ 246.217615][ T4096] Call Trace:
> [ 246.218090][ T4096] <TASK>
> [ 246.218467][ T4096] ? show_regs (arch/x86/kernel/dumpstack.c:479)
> [ 246.218979][ T4096] ? __warn (kernel/panic.c:677)
> [ 246.219505][ T4096] ? shmem_release_dquot (mm/shmem_quota.c:290 (discriminator 3))
> [ 246.220197][ T4096] ? report_bug (lib/bug.c:201 lib/bug.c:219)
> [ 246.220775][ T4096] ? shmem_release_dquot (mm/shmem_quota.c:290 (discriminator 3))
> [ 246.221500][ T4096] ? handle_bug (arch/x86/kernel/traps.c:238)
> [ 246.222081][ T4096] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1))
> [ 246.222687][ T4096] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568)
> [ 246.223296][ T4096] ? __warn_printk (./include/linux/context_tracking.h:155 kernel/panic.c:726)
> [ 246.223878][ T4096] ? __warn_printk (kernel/panic.c:717)
> [ 246.224460][ T4096] ? shmem_release_dquot (mm/shmem_quota.c:290 (discriminator 3))
> [ 246.225125][ T4096] quota_release_workfn (fs/quota/dquot.c:839)
> [ 246.225792][ T4096] ? dquot_release (fs/quota/dquot.c:810)
> [ 246.226401][ T4096] process_one_work (kernel/workqueue.c:2638)
> [ 246.227001][ T4096] ? lock_sync (kernel/locking/lockdep.c:5722)
> [ 246.227509][ T4096] ? workqueue_congested (kernel/workqueue.c:2542)
> [ 246.228266][ T4096] ? assign_work (kernel/workqueue.c:1102)
> [ 246.228846][ T4096] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787)
> [ 246.229477][ T4096] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4423)
> [ 246.230150][ T4096] ? process_one_work (kernel/workqueue.c:2733)
> [ 246.230735][ T4096] kthread (kernel/kthread.c:388)
> [ 246.231247][ T4096] ? kthread_complete_and_exit (kernel/kthread.c:341)
> [ 246.231950][ T4096] ret_from_fork (arch/x86/kernel/process.c:153)
> [ 246.232465][ T4096] ? kthread_complete_and_exit (kernel/kthread.c:341)
> [ 246.233153][ T4096] ret_from_fork_asm (arch/x86/entry/entry_64.S:250)
> [ 246.233783][ T4096] </TASK>
> [ 246.234175][ T4096] Kernel panic - not syncing: kernel: panic_on_warn set ...
> [ 246.235087][ T4096] CPU: 1 PID: 4096 Comm: kworker/u6:6 Not tainted 6.8.0-rc1-gecb1b8288dc7 #21
> [ 246.236174][ T4096] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
> [ 246.237207][ T4096] Workqueue: events_unbound quota_release_workfn
> [ 246.237927][ T4096] Call Trace:
> [ 246.238294][ T4096] <TASK>
> [ 246.238619][ T4096] dump_stack_lvl (lib/dump_stack.c:107)
> [ 246.239144][ T4096] panic (kernel/panic.c:344)
> [ 246.239584][ T4096] ? panic_smp_self_stop+0xa0/0xa0
> [ 246.240154][ T4096] ? check_panic_on_warn (kernel/panic.c:236)
> [ 246.240714][ T4096] ? shmem_release_dquot (mm/shmem_quota.c:290 (discriminator 3))
> [ 246.241303][ T4096] check_panic_on_warn (kernel/panic.c:237)
> [ 246.241915][ T4096] __warn (./arch/x86/include/asm/current.h:42 kernel/panic.c:682)
> [ 246.242428][ T4096] ? shmem_release_dquot (mm/shmem_quota.c:290 (discriminator 3))
> [ 246.243117][ T4096] report_bug (lib/bug.c:201 lib/bug.c:219)
> [ 246.243688][ T4096] ? shmem_release_dquot (mm/shmem_quota.c:290 (discriminator 3))
> [ 246.244390][ T4096] handle_bug (arch/x86/kernel/traps.c:238)
> [ 246.244957][ T4096] exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1))
> [ 246.245551][ T4096] asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568)
> [ 246.246189][ T4096] RIP: 0010:shmem_release_dquot (mm/shmem_quota.c:290 (discriminator 3))
> [ 246.246945][ T4096] Code: e8 28 d9 18 00 e9 b3 f8 ff ff e8 6e e1 c2 ff c6 05 bf e8 1b 0d 01 90 48 c7 c7 80 f0 b8 8a 4c 89 ea 44 89 e6 e8 14 6d 89 ff 90 <0f> 0b 90 90 e9 18 fb ff ff e8 f5 d8 18 00 e9 a2 fa ff ff e8 0b d9
> All code
> ========
> 0: e8 28 d9 18 00 call 0x18d92d
> 5: e9 b3 f8 ff ff jmp 0xfffffffffffff8bd
> a: e8 6e e1 c2 ff call 0xffffffffffc2e17d
> f: c6 05 bf e8 1b 0d 01 movb $0x1,0xd1be8bf(%rip) # 0xd1be8d5
> 16: 90 nop
> 17: 48 c7 c7 80 f0 b8 8a mov $0xffffffff8ab8f080,%rdi
> 1e: 4c 89 ea mov %r13,%rdx
> 21: 44 89 e6 mov %r12d,%esi
> 24: e8 14 6d 89 ff call 0xffffffffff896d3d
> 29: 90 nop
> 2a:* 0f 0b ud2 <-- trapping instruction
> 2c: 90 nop
> 2d: 90 nop
> 2e: e9 18 fb ff ff jmp 0xfffffffffffffb4b
> 33: e8 f5 d8 18 00 call 0x18d92d
> 38: e9 a2 fa ff ff jmp 0xfffffffffffffadf
> 3d: e8 .byte 0xe8
> 3e: 0b d9 or %ecx,%ebx
>
> Code starting with the faulting instruction
> ===========================================
> 0: 0f 0b ud2
> 2: 90 nop
> 3: 90 nop
> 4: e9 18 fb ff ff jmp 0xfffffffffffffb21
> 9: e8 f5 d8 18 00 call 0x18d903
> e: e9 a2 fa ff ff jmp 0xfffffffffffffab5
> 13: e8 .byte 0xe8
> 14: 0b d9 or %ecx,%ebx
> [ 246.249288][ T4096] RSP: 0018:ffffc9000604fbc0 EFLAGS: 00010286
> [ 246.250033][ T4096] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff814c77da
> [ 246.251035][ T4096] RDX: ffff888049a58000 RSI: ffffffff814c77e7 RDI: 0000000000000001
> [ 246.252036][ T4096] RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
> [ 246.253028][ T4096] R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000004000
> [ 246.254060][ T4096] R13: ffff888051bd3000 R14: dffffc0000000000 R15: ffff888051bd3040
> [ 246.255058][ T4096] ? __warn_printk (./include/linux/context_tracking.h:155 kernel/panic.c:726)
> [ 246.255694][ T4096] ? __warn_printk (kernel/panic.c:717)
> [ 246.256256][ T4096] quota_release_workfn (fs/quota/dquot.c:839)
> [ 246.256877][ T4096] ? dquot_release (fs/quota/dquot.c:810)
> [ 246.257467][ T4096] process_one_work (kernel/workqueue.c:2638)
> [ 246.258126][ T4096] ? lock_sync (kernel/locking/lockdep.c:5722)
> [ 246.258718][ T4096] ? workqueue_congested (kernel/workqueue.c:2542)
> [ 246.259339][ T4096] ? assign_work (kernel/workqueue.c:1102)
> [ 246.259915][ T4096] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787)
> [ 246.260529][ T4096] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4423)
> [ 246.261176][ T4096] ? process_one_work (kernel/workqueue.c:2733)
> [ 246.261855][ T4096] kthread (kernel/kthread.c:388)
> [ 246.262382][ T4096] ? kthread_complete_and_exit (kernel/kthread.c:341)
> [ 246.263077][ T4096] ret_from_fork (arch/x86/kernel/process.c:153)
> [ 246.263620][ T4096] ? kthread_complete_and_exit (kernel/kthread.c:341)
> [ 246.264331][ T4096] ret_from_fork_asm (arch/x86/entry/entry_64.S:250)
> [ 246.264910][ T4096] </TASK>
> [ 246.265598][ T4096] Kernel Offset: disabled
> [ 246.266259][ T4096] Rebooting in 86400 seconds..
>
> Thank you for taking the time to read this email and we look forward to working with you further.
Carlos, this looks like one for you to puzzle over -
thanks,
Hugh
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