From: Catalin Marinas <catalin.marinas@arm.com>
To: linux-arm-kernel@lists.infradead.org,
Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>,
Kevin Brodsky <kevin.brodsky@arm.com>,
Steven Price <steven.price@arm.com>,
stable@vger.kernel.org,
Vincenzo Frascino <vincenzo.frascino@arm.com>,
Luis Machado <luis.machado@linaro.org>
Subject: Re: [PATCH] arm64: mte: Allow PTRACE_PEEKMTETAGS access to the zero page
Date: Fri, 12 Feb 2021 16:45:59 +0000 [thread overview]
Message-ID: <161314834566.23182.2604906410285576324.b4-ty@arm.com> (raw)
In-Reply-To: <20210210180316.23654-1-catalin.marinas@arm.com>
On Wed, 10 Feb 2021 18:03:16 +0000, Catalin Marinas wrote:
> The ptrace(PTRACE_PEEKMTETAGS) implementation checks whether the user
> page has valid tags (mapped with PROT_MTE) by testing the PG_mte_tagged
> page flag. If this bit is cleared, ptrace(PTRACE_PEEKMTETAGS) returns
> -EIO.
>
> A newly created (PROT_MTE) mapping points to the zero page which had its
> tags zeroed during cpu_enable_mte(). If there were no prior writes to
> this mapping, ptrace(PTRACE_PEEKMTETAGS) fails with -EIO since the zero
> page does not have the PG_mte_tagged flag set.
>
> [...]
Applied to arm64 (for-next/fixes), thanks!
[1/1] arm64: mte: Allow PTRACE_PEEKMTETAGS access to the zero page
https://git.kernel.org/arm64/c/68d54ceeec0e
--
Catalin
WARNING: multiple messages have this Message-ID (diff)
From: Catalin Marinas <catalin.marinas@arm.com>
To: linux-arm-kernel@lists.infradead.org,
Catalin Marinas <catalin.marinas@arm.com>
Cc: Luis Machado <luis.machado@linaro.org>,
Kevin Brodsky <kevin.brodsky@arm.com>,
stable@vger.kernel.org, Steven Price <steven.price@arm.com>,
Vincenzo Frascino <vincenzo.frascino@arm.com>,
Will Deacon <will@kernel.org>
Subject: Re: [PATCH] arm64: mte: Allow PTRACE_PEEKMTETAGS access to the zero page
Date: Fri, 12 Feb 2021 16:45:59 +0000 [thread overview]
Message-ID: <161314834566.23182.2604906410285576324.b4-ty@arm.com> (raw)
In-Reply-To: <20210210180316.23654-1-catalin.marinas@arm.com>
On Wed, 10 Feb 2021 18:03:16 +0000, Catalin Marinas wrote:
> The ptrace(PTRACE_PEEKMTETAGS) implementation checks whether the user
> page has valid tags (mapped with PROT_MTE) by testing the PG_mte_tagged
> page flag. If this bit is cleared, ptrace(PTRACE_PEEKMTETAGS) returns
> -EIO.
>
> A newly created (PROT_MTE) mapping points to the zero page which had its
> tags zeroed during cpu_enable_mte(). If there were no prior writes to
> this mapping, ptrace(PTRACE_PEEKMTETAGS) fails with -EIO since the zero
> page does not have the PG_mte_tagged flag set.
>
> [...]
Applied to arm64 (for-next/fixes), thanks!
[1/1] arm64: mte: Allow PTRACE_PEEKMTETAGS access to the zero page
https://git.kernel.org/arm64/c/68d54ceeec0e
--
Catalin
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next prev parent reply other threads:[~2021-02-12 16:46 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-10 18:03 [PATCH] arm64: mte: Allow PTRACE_PEEKMTETAGS access to the zero page Catalin Marinas
2021-02-10 18:03 ` Catalin Marinas
2021-02-10 18:52 ` Luis Machado
2021-02-10 18:52 ` Luis Machado
2021-02-11 10:35 ` Catalin Marinas
2021-02-11 10:35 ` Catalin Marinas
2021-02-11 10:56 ` Vincenzo Frascino
2021-02-11 10:56 ` Vincenzo Frascino
2021-02-12 16:45 ` Catalin Marinas [this message]
2021-02-12 16:45 ` Catalin Marinas
2021-02-16 18:56 vivek
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