From: Catalin Marinas <catalin.marinas@arm.com>
To: Peter Collingbourne <pcc@google.com>, Will Deacon <will@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org,
Marc Zyngier <maz@kernel.org>,
stable@vger.kernel.org
Subject: Re: [PATCH] arm64: set UXN on swapper page tables
Date: Wed, 20 Jul 2022 20:04:48 +0100 [thread overview]
Message-ID: <165834388144.420659.7440428405850430601.b4-ty@arm.com> (raw)
In-Reply-To: <20220719234909.1398992-1-pcc@google.com>
On Tue, 19 Jul 2022 16:49:09 -0700, Peter Collingbourne wrote:
> On a system that implements FEAT_EPAN, read/write access to the idmap
> is denied because UXN is not set on the swapper PTEs. As a result,
> idmap_kpti_install_ng_mappings panics the kernel when accessing
> __idmap_kpti_flag. Fix it by setting UXN on these PTEs.
>
>
Applied to arm64 (for-next/fixes), thanks!
[1/1] arm64: set UXN on swapper page tables
https://git.kernel.org/arm64/c/f7b4c3b82e7d
--
Catalin
WARNING: multiple messages have this Message-ID (diff)
From: Catalin Marinas <catalin.marinas@arm.com>
To: Peter Collingbourne <pcc@google.com>, Will Deacon <will@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org,
Marc Zyngier <maz@kernel.org>,
stable@vger.kernel.org
Subject: Re: [PATCH] arm64: set UXN on swapper page tables
Date: Wed, 20 Jul 2022 20:04:48 +0100 [thread overview]
Message-ID: <165834388144.420659.7440428405850430601.b4-ty@arm.com> (raw)
In-Reply-To: <20220719234909.1398992-1-pcc@google.com>
On Tue, 19 Jul 2022 16:49:09 -0700, Peter Collingbourne wrote:
> On a system that implements FEAT_EPAN, read/write access to the idmap
> is denied because UXN is not set on the swapper PTEs. As a result,
> idmap_kpti_install_ng_mappings panics the kernel when accessing
> __idmap_kpti_flag. Fix it by setting UXN on these PTEs.
>
>
Applied to arm64 (for-next/fixes), thanks!
[1/1] arm64: set UXN on swapper page tables
https://git.kernel.org/arm64/c/f7b4c3b82e7d
--
Catalin
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next prev parent reply other threads:[~2022-07-20 19:04 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-19 23:49 [PATCH] arm64: set UXN on swapper page tables Peter Collingbourne
2022-07-19 23:49 ` Peter Collingbourne
2022-07-20 9:56 ` Will Deacon
2022-07-20 9:56 ` Will Deacon
2022-07-20 19:04 ` Catalin Marinas [this message]
2022-07-20 19:04 ` Catalin Marinas
2022-07-21 16:19 ` Catalin Marinas
2022-07-21 16:19 ` Catalin Marinas
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