Re: [PATCH 5/5] kasan: Extend KASAN mode kernel parameter
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From: Catalin Marinas <catalin.marinas@arm.com>
Date: 2021-09-20 15:32:09
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On Mon, Sep 13, 2021 at 09:14:24AM +0100, Vincenzo Frascino wrote:
quoted hunk ↗ jump to hunk
diff --git a/Documentation/dev-tools/kasan.rst b/Documentation/dev-tools/kasan.rst index 21dc03bc10a4..7f43e603bfbe 100644 --- a/Documentation/dev-tools/kasan.rst +++ b/Documentation/dev-tools/kasan.rst@@ -194,14 +194,20 @@ additional boot parameters that allow disabling KASAN or controlling features: - ``kasan=off`` or ``=on`` controls whether KASAN is enabled (default: ``on``). -- ``kasan.mode=sync`` or ``=async`` controls whether KASAN is configured in - synchronous or asynchronous mode of execution (default: ``sync``). +- ``kasan.mode=sync``, ``=async`` or ``=asymm`` controls whether KASAN + is configured in synchronous, asynchronous or asymmetric mode of + execution (default: ``sync``). Synchronous mode: a bad access is detected immediately when a tag check fault occurs. Asynchronous mode: a bad access detection is delayed. When a tag check fault occurs, the information is stored in hardware (in the TFSR_EL1 register for arm64). The kernel periodically checks the hardware and only reports tag faults during these checks. + Asymmetric mode: a bad access is detected immediately when a tag + check fault occurs during a load operation and its detection is + delayed during a store operation. For the store operations the kernel + periodically checks the hardware and only reports tag faults during + these checks.
Nitpick: I'd simply refer to the sync/async which already describe what the kernel and hardware does, something like the tag checks synchronous on reads and asynchronous on writes. Otherwise: Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel