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From: Will Deacon <will@kernel.org>
To: linux-arm-kernel@lists.infradead.org,
	Anshuman Khandual <anshuman.khandual@arm.com>
Cc: catalin.marinas@arm.com, kernel-team@android.com,
	Will Deacon <will@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	linux-kernel@vger.kernel.org, James Morse <james.morse@arm.com>
Subject: Re: [PATCH] arm64/mm: Fix ttbr0 values stored in struct thread_info for software-pan
Date: Tue, 15 Jun 2021 20:18:21 +0100	[thread overview]
Message-ID: <162378020482.22871.14339302272957309916.b4-ty@kernel.org> (raw)
In-Reply-To: <1623749578-11231-1-git-send-email-anshuman.khandual@arm.com>

On Tue, 15 Jun 2021 15:02:58 +0530, Anshuman Khandual wrote:
> When using CONFIG_ARM64_SW_TTBR0_PAN, a task's thread_info::ttbr0 must be
> the TTBR0_EL1 value used to run userspace. With 52-bit PAs, the PA must be
> packed into the TTBR using phys_to_ttbr(), but we forget to do this in some
> of the SW PAN code. Thus, if the value is installed into TTBR0_EL1 (as may
> happen in the uaccess routines), this could result in UNPREDICTABLE
> behaviour.
> 
> [...]

Applied to arm64 (for-next/mm), thanks!

[1/1] arm64/mm: Fix ttbr0 values stored in struct thread_info for software-pan
      https://git.kernel.org/arm64/c/9163f0113030

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev

WARNING: multiple messages have this Message-ID (diff)
From: Will Deacon <will@kernel.org>
To: linux-arm-kernel@lists.infradead.org,
	Anshuman Khandual <anshuman.khandual@arm.com>
Cc: catalin.marinas@arm.com, kernel-team@android.com,
	Will Deacon <will@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	linux-kernel@vger.kernel.org, James Morse <james.morse@arm.com>
Subject: Re: [PATCH] arm64/mm: Fix ttbr0 values stored in struct thread_info for software-pan
Date: Tue, 15 Jun 2021 20:18:21 +0100	[thread overview]
Message-ID: <162378020482.22871.14339302272957309916.b4-ty@kernel.org> (raw)
In-Reply-To: <1623749578-11231-1-git-send-email-anshuman.khandual@arm.com>

On Tue, 15 Jun 2021 15:02:58 +0530, Anshuman Khandual wrote:
> When using CONFIG_ARM64_SW_TTBR0_PAN, a task's thread_info::ttbr0 must be
> the TTBR0_EL1 value used to run userspace. With 52-bit PAs, the PA must be
> packed into the TTBR using phys_to_ttbr(), but we forget to do this in some
> of the SW PAN code. Thus, if the value is installed into TTBR0_EL1 (as may
> happen in the uaccess routines), this could result in UNPREDICTABLE
> behaviour.
> 
> [...]

Applied to arm64 (for-next/mm), thanks!

[1/1] arm64/mm: Fix ttbr0 values stored in struct thread_info for software-pan
      https://git.kernel.org/arm64/c/9163f0113030

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev

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  parent reply	other threads:[~2021-06-15 19:18 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-15  9:32 [PATCH] arm64/mm: Fix ttbr0 values stored in struct thread_info for software-pan Anshuman Khandual
2021-06-15  9:32 ` Anshuman Khandual
2021-06-15 14:25 ` Catalin Marinas
2021-06-15 14:25   ` Catalin Marinas
2021-06-15 14:26   ` Will Deacon
2021-06-15 14:26     ` Will Deacon
2021-06-15 19:18 ` Will Deacon [this message]
2021-06-15 19:18   ` Will Deacon

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