linux-kernel - [PATCH v2 0/3] arm64/fpsimd: Fix use after free in SME when changing SVE VL

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Message-Id: <20230720-arm64-fix-sve-sme-vl-change-v2-0-8eea06b82d57@kernel.org>
Date:   Thu, 20 Jul 2023 19:38:57 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Shuah Khan <shuah@...nel.org>
Cc:     David Spickett <David.Spickett@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org, Mark Brown <broonie@...nel.org>,
        stable@...r.kernel.org
Subject: [PATCH v2 0/3] arm64/fpsimd: Fix use after free in SME when
 changing SVE VL

This series fixes an issue which David Spickett found where if we change
the SVE VL while SME is in use we can end up attempting to save state to
an unallocated buffer and adds testing coverage for that plus a bit more
coverage of VL changes, just for paranioa.

Signed-off-by: Mark Brown <broonie@...nel.org>
---
Changes in v2:
- Always reallocate the SVE state.
- Rebase onto v6.5-rc2.
- Link to v1: https://lore.kernel.org/r/20230713-arm64-fix-sve-sme-vl-change-v1-0-129dd8611413@kernel.org

---
Mark Brown (3):
      arm64/fpsimd: Ensure SME storage is allocated after SVE VL changes
      kselftest/arm64: Add a test case for SVE VL changes with SME active
      kselftest/arm64: Validate that changing one VL type does not affect another

 arch/arm64/kernel/fpsimd.c                    |  33 +++++--
 tools/testing/selftests/arm64/fp/vec-syscfg.c | 127 +++++++++++++++++++++++++-
 2 files changed, 148 insertions(+), 12 deletions(-)
---
base-commit: 06785562d1b99ff6dc1cd0af54be5e3ff999dc02
change-id: 20230713-arm64-fix-sve-sme-vl-change-60eb1fa6a707

Best regards,
-- 
Mark Brown <broonie@...nel.org>