linux-kernel - Re: [syzbot] [kvmarm?] BUG: unable to handle kernel paging request in __hwasan_check_x0

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Message-ID: <867c80ro2w.wl-maz@kernel.org>
Date: Mon, 16 Dec 2024 09:09:43 +0000
From: Marc Zyngier <maz@...nel.org>
To: syzbot <syzbot+67a9ec5b1706e0184581@...kaller.appspotmail.com>
Cc: catalin.marinas@....com,
	joey.gouly@....com,
	kvmarm@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	oliver.upton@...ux.dev,
	suzuki.poulose@....com,
	syzkaller-bugs@...glegroups.com,
	will@...nel.org,
	yuzenghui@...wei.com
Subject: Re: [syzbot] [kvmarm?] BUG: unable to handle kernel paging request in __hwasan_check_x0_ADDR

On Thu, 12 Dec 2024 08:48:18 +0000,
syzbot <syzbot+67a9ec5b1706e0184581@...kaller.appspotmail.com> wrote:
> 
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    5db899a34f75 Merge remote-tracking branch 'kernel/kvmarm/n..
> git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm.git fuzzme
> console output: https://syzkaller.appspot.com/x/log.txt?x=16db78f8580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=fde68ab6d6c8c8ab
> dashboard link: https://syzkaller.appspot.com/bug?extid=67a9ec5b1706e0184581
> compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
> userspace arch: arm64
> 
> Unfortunately, I don't have any reproducer for this issue yet.
> 
> Downloadable assets:
> disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/384ffdcca292/non_bootable_disk-5db899a3.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/4938b757ff4a/vmlinux-5db899a3.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/936938b47987/Image-5db899a3.gz.xz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+67a9ec5b1706e0184581@...kaller.appspotmail.com
> 
> Unable to handle kernel paging request at virtual address efff800000000137
> KASAN: probably user-memory-access in range [0x0000000000001370-0x000000000000137f]
> Mem abort info:
>   ESR = 0x0000000096000005
>   EC = 0x25: DABT (current EL), IL = 32 bits
>   SET = 0, FnV = 0
>   EA = 0, S1PTW = 0
>   FSC = 0x05: level 1 translation fault
> Data abort info:
>   ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000
>   CM = 0, WnR = 0, TnD = 0, TagAccess = 0
>   GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
> swapper pgtable: 4k pages, 52-bit VAs, pgdp=0000000044a53000
> [efff800000000137] pgd=1000000049992003, p4d=1000000049993003, pud=0000000000000000
> Internal error: Oops: 0000000096000005 [#1] PREEMPT SMP
> Modules linked in:
> CPU: 0 UID: 0 PID: 6560 Comm: syz.2.929 Not tainted 6.12.0-rc7-syzkaller-g5db899a34f75 #0
> Hardware name: linux,dummy-virt (DT)
> pstate: 80402009 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> pc : __hwasan_check_x0_67043363+0x4/0x30
> lr : vgic_get_irq+0x7c/0x3d4 arch/arm64/kvm/vgic/vgic.c:93
> sp : ffff80008c597650
> x29: ffff80008c597660 x28: 00000000000000e0 x27: 0000000000000004
> x26: 0000000000000002 x25: ffff800083a7fe20 x24: 16f0000014accd90
> x23: 16f0000014acb9a0 x22: 0000000000000000 x21: a9ff80008c583000
> x20: 0000000000000001 x19: efff800000000000 x18: 0000000000000005
> x17: 0000000000000000 x16: 0000000000000137 x15: 0000000000000000
> x14: 0000000000000002 x13: 0000000000000003 x12: 70f000000a33ba80
> x11: 0000000000080000 x10: 0000000000001378 x9 : efff800000000000
> x8 : 0000000000000001 x7 : 0000000000000001 x6 : 0000000000000001
> x5 : ffff80008c597858 x4 : ffff8000800f2b38 x3 : ffff8000800f7a00
> x2 : 0000000000000001 x1 : 0000000000000001 x0 : 0000000000001378
> Call trace:
>  __hwasan_check_x0_67043363+0x4/0x30
>  vgic_mmio_write_invlpi+0xb0/0x174 arch/arm64/kvm/vgic/vgic-mmio-v3.c:546
>  dispatch_mmio_write+0x2a4/0x308
>  kvm_iodevice_write include/kvm/iodev.h:54 [inline]
>  __kvm_io_bus_write+0x290/0x340 virt/kvm/kvm_main.c:5852
>  kvm_io_bus_write+0x100/0x1bc virt/kvm/kvm_main.c:5877
>  io_mem_abort+0x4b8/0x7a0 arch/arm64/kvm/mmio.c:204
>  kvm_handle_guest_abort+0xb4c/0x1c64 arch/arm64/kvm/mmu.c:1880
>  handle_trap_exceptions arch/arm64/kvm/handle_exit.c:351 [inline]
>  handle_exit+0x1a0/0x274 arch/arm64/kvm/handle_exit.c:381
>  kvm_arch_vcpu_ioctl_run+0xbc0/0x15b0 arch/arm64/kvm/arm.c:1279
>  kvm_vcpu_ioctl+0x660/0xf78 virt/kvm/kvm_main.c:4475
>  vfs_ioctl fs/ioctl.c:51 [inline]
>  __do_sys_ioctl fs/ioctl.c:907 [inline]
>  __se_sys_ioctl fs/ioctl.c:893 [inline]
>  __arm64_sys_ioctl+0x108/0x184 fs/ioctl.c:893
>  __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
>  invoke_syscall+0x78/0x1b8 arch/arm64/kernel/syscall.c:49
>  el0_svc_common+0xe8/0x1b0 arch/arm64/kernel/syscall.c:132
>  do_el0_svc+0x40/0x50 arch/arm64/kernel/syscall.c:151
>  el0_svc+0x54/0x14c arch/arm64/kernel/entry-common.c:712
>  el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
>  el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598
> Code: a90efbfd d2800441 143a3ed3 9344dc10 (38706930)

This seems to be something that is already handled by d561491ba927c
("KVM: arm64: vgic-v3: Sanitise guest writes to GICR_INVLPIR"), which
made it into 6.13-rc1.

The branch you are using doesn't seem to contain that particular
commit. I have now updated it to -rc3, which should plug that issue.

Let me know if it keeps appearing.

Thanks,

	M.

-- 
Without deviation from the norm, progress is not possible.