linux-kernel - Re: [PATCH] arm64: Avoid premature usercopy failure

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Message-Id: <162636655524.637200.10931507080931105968.b4-ty@kernel.org>
Date:   Thu, 15 Jul 2021 18:39:03 +0100
From:   Will Deacon <will@...nel.org>
To:     Robin Murphy <robin.murphy@....com>, catalin.marinas@....com
Cc:     kernel-team@...roid.com, Will Deacon <will@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Chen Huang <chenhuang5@...wei.com>, linux-mm@...ck.org,
        Al Viro <viro@...iv.linux.org.uk>, stable@...r.kernel.org
Subject: Re: [PATCH] arm64: Avoid premature usercopy failure

On Mon, 12 Jul 2021 15:27:46 +0100, Robin Murphy wrote:
> Al reminds us that the usercopy API must only return complete failure
> if absolutely nothing could be copied. Currently, if userspace does
> something silly like giving us an unaligned pointer to Device memory,
> or a size which overruns MTE tag bounds, we may fail to honour that
> requirement when faulting on a multi-byte access even though a smaller
> access could have succeeded.
> 
> [...]

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

[1/1] arm64: Avoid premature usercopy failure
      https://git.kernel.org/arm64/c/295cf156231c

Cheers,
-- 
Will

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