linux-kernel - Re: [PATCH v2] KVM: arm64: Fix shift-out-of-bounds bug

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Message-Id: <172915337759.953359.17693189186554582464.b4-ty@kernel.org>
Date: Thu, 17 Oct 2024 09:23:10 +0100
From: Marc Zyngier <maz@...nel.org>
To: Gavin Shan <gshan@...hat.com>,
	Oliver Upton <oliver.upton@...ux.dev>,
	Joey Gouly <joey.gouly@....com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Zenghui Yu <yuzenghui@...wei.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Akihiko Odaki <akihiko.odaki@...nix.com>,
	Ilkka Koskinen <ilkka@...amperecomputing.com>
Cc: linux-arm-kernel@...ts.infradead.org,
	kvmarm@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] KVM: arm64: Fix shift-out-of-bounds bug

On Wed, 16 Oct 2024 19:57:01 -0700, Ilkka Koskinen wrote:
> Fix a shift-out-of-bounds bug reported by UBSAN when running
> VM with MTE enabled host kernel.
> 
> UBSAN: shift-out-of-bounds in arch/arm64/kvm/sys_regs.c:1988:14
> shift exponent 33 is too large for 32-bit type 'int'
> CPU: 26 UID: 0 PID: 7629 Comm: qemu-kvm Not tainted 6.12.0-rc2 #34
> Hardware name: IEI NF5280R7/Mitchell MB, BIOS 00.00. 2024-10-12 09:28:54 10/14/2024
> Call trace:
>  dump_backtrace+0xa0/0x128
>  show_stack+0x20/0x38
>  dump_stack_lvl+0x74/0x90
>  dump_stack+0x18/0x28
>  __ubsan_handle_shift_out_of_bounds+0xf8/0x1e0
>  reset_clidr+0x10c/0x1c8
>  kvm_reset_sys_regs+0x50/0x1c8
>  kvm_reset_vcpu+0xec/0x2b0
>  __kvm_vcpu_set_target+0x84/0x158
>  kvm_vcpu_set_target+0x138/0x168
>  kvm_arch_vcpu_ioctl_vcpu_init+0x40/0x2b0
>  kvm_arch_vcpu_ioctl+0x28c/0x4b8
>  kvm_vcpu_ioctl+0x4bc/0x7a8
>  __arm64_sys_ioctl+0xb4/0x100
>  invoke_syscall+0x70/0x100
>  el0_svc_common.constprop.0+0x48/0xf0
>  do_el0_svc+0x24/0x38
>  el0_svc+0x3c/0x158
>  el0t_64_sync_handler+0x120/0x130
>  el0t_64_sync+0x194/0x198
> 
> [...]

Applied to fixes, thanks!

[1/1] KVM: arm64: Fix shift-out-of-bounds bug
      commit: c6c167afa090ea0451f91814e1318755a8fb8bb9

Cheers,

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