From: Will Deacon <will@kernel.org>
To: linux-arm-kernel@lists.infradead.org,
Kevin Brodsky <kevin.brodsky@arm.com>
Cc: catalin.marinas@arm.com, kernel-team@android.com,
Will Deacon <will@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
"David Hildenbrand (Arm)" <david@kernel.org>,
Joey Gouly <joey.gouly@arm.com>, Mark Brown <broonie@kernel.org>,
Shuah Khan <shuah@kernel.org>,
linux-kselftest@vger.kernel.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 0/5] POE sigreturn fix and extra tests
Date: Tue, 19 May 2026 16:23:00 +0100 [thread overview]
Message-ID: <177918804505.746149.6023931077901684027.b4-ty@kernel.org> (raw)
In-Reply-To: <20260427-poe_signal-v2-0-2bd9d6f16ab4@arm.com>
On Mon, 27 Apr 2026 13:03:32 +0100, Kevin Brodsky wrote:
> Commit 2e8a1acea859 ("arm64: signal: Improve POR_EL0 handling to
> avoid uaccess failures") introduced special handling for EL0 registers
> that impact uaccess. This did not however handle the case where a signal
> handler removes the relevant record (poe_context for POE) from the
> signal frame; this is clearly not typical behaviour but it is legal.
> That commit resulted in arbitrary data from the kernel stack being
> written to POR_EL0 in that case.
>
> [...]
Applied selftest updates to arm64 (for-next/selftests), thanks!
[2/5] selftests/mm: Fix resv_sz when parsing arm64 signal frame
https://git.kernel.org/arm64/c/c364aa56d673
[3/5] kselftest/arm64: Add POE as a feature in the signal tests
https://git.kernel.org/arm64/c/42c21954063e
[4/5] kselftest/arm64: Move/add POE helpers to test_signals_utils.h
https://git.kernel.org/arm64/c/925a082ec2a0
[5/5] kselftest/arm64: Add tests for POR_EL0 save/reset/restore
https://git.kernel.org/arm64/c/f2db075234c8
Cheers,
--
Will
https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev
prev parent reply other threads:[~2026-05-19 15:24 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-27 12:03 [PATCH v2 0/5] POE sigreturn fix and extra tests Kevin Brodsky
2026-04-27 12:03 ` [PATCH v2 1/5] arm64: signal: Preserve POR_EL0 if poe_context is missing Kevin Brodsky
2026-04-27 12:03 ` [PATCH v2 2/5] selftests/mm: Fix resv_sz when parsing arm64 signal frame Kevin Brodsky
2026-04-27 22:46 ` Mark Brown
2026-04-27 12:03 ` [PATCH v2 3/5] kselftest/arm64: Add POE as a feature in the signal tests Kevin Brodsky
2026-04-27 12:03 ` [PATCH v2 4/5] kselftest/arm64: Move/add POE helpers to test_signals_utils.h Kevin Brodsky
2026-04-27 12:03 ` [PATCH v2 5/5] kselftest/arm64: Add tests for POR_EL0 save/reset/restore Kevin Brodsky
2026-05-01 16:48 ` (subset) [PATCH v2 0/5] POE sigreturn fix and extra tests Catalin Marinas
2026-05-19 15:23 ` Will Deacon [this message]
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