Re: [PATCH] arm64: mte: Allow PTRACE_PEEKMTETAGS access to the zero page
From: Catalin Marinas <catalin.marinas@arm.com>
Date: 2021-02-12 16:46:45
Also in:
stable
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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