From: Peter Zijlstra <peterz@infradead.org>
To: Maciej Wieczor-Retman <maciej.wieczor-retman@intel.com>
Cc: nathan@kernel.org, arnd@arndb.de, broonie@kernel.org,
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Subject: Re: [PATCH v4 13/18] kasan: arm64: x86: Handle int3 for inline KASAN reports
Date: Wed, 13 Aug 2025 17:17:02 +0200 [thread overview]
Message-ID: <20250813151702.GO4067720@noisy.programming.kicks-ass.net> (raw)
In-Reply-To: <9030d5a35eb5a3831319881cb8cb040aad65b7b6.1755004923.git.maciej.wieczor-retman@intel.com>
On Tue, Aug 12, 2025 at 03:23:49PM +0200, Maciej Wieczor-Retman wrote:
> Inline KASAN on x86 does tag mismatch reports by passing the faulty
> address and metadata through the INT3 instruction - scheme that's setup
> in the LLVM's compiler code (specifically HWAddressSanitizer.cpp).
>
> Add a kasan hook to the INT3 handling function.
>
> Disable KASAN in an INT3 core kernel selftest function since it can raise
> a false tag mismatch report and potentially panic the kernel.
>
> Make part of that hook - which decides whether to die or recover from a
> tag mismatch - arch independent to avoid duplicating a long comment on
> both x86 and arm64 architectures.
>
> Signed-off-by: Maciej Wieczor-Retman <maciej.wieczor-retman@intel.com>
Can we please split this into an arm64 and x86 patch. Also, why use int3
here rather than a #UD trap, which we use for all other such cases?
next prev parent reply other threads:[~2025-08-13 15:17 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-08-12 13:23 [PATCH v4 00/18] kasan: x86: arm64: KASAN tag-based mode for x86 Maciej Wieczor-Retman
2025-08-12 13:23 ` [PATCH v4 01/18] kasan: sw_tags: Use arithmetic shift for shadow computation Maciej Wieczor-Retman
2025-08-12 13:23 ` [PATCH v4 02/18] kasan: sw_tags: Support tag widths less than 8 bits Maciej Wieczor-Retman
2025-08-13 14:48 ` Ada Couprie Diaz
2025-08-18 4:24 ` Maciej Wieczor-Retman
2025-08-12 13:23 ` [PATCH v4 03/18] kasan: Fix inline mode for x86 tag-based mode Maciej Wieczor-Retman
2025-08-12 13:23 ` [PATCH v4 04/18] x86: Add arch specific kasan functions Maciej Wieczor-Retman
2025-08-12 13:23 ` [PATCH v4 05/18] kasan: arm64: x86: Make special tags arch specific Maciej Wieczor-Retman
2025-08-12 13:23 ` [PATCH v4 06/18] x86: Reset tag for virtual to physical address conversions Maciej Wieczor-Retman
2025-08-14 7:15 ` Mike Rapoport
2025-08-18 5:29 ` Maciej Wieczor-Retman
2025-08-12 13:23 ` [PATCH v4 07/18] mm: x86: Untag addresses in EXECMEM_ROX related pointer arithmetic Maciej Wieczor-Retman
2025-08-14 7:26 ` Mike Rapoport
2025-08-18 5:47 ` Maciej Wieczor-Retman
2025-08-12 13:23 ` [PATCH v4 08/18] x86: Physical address comparisons in fill_p*d/pte Maciej Wieczor-Retman
2025-08-12 13:23 ` [PATCH v4 09/18] x86: KASAN raw shadow memory PTE init Maciej Wieczor-Retman
2025-08-12 13:23 ` [PATCH v4 10/18] x86: LAM compatible non-canonical definition Maciej Wieczor-Retman
2025-08-12 13:23 ` [PATCH v4 11/18] x86: LAM initialization Maciej Wieczor-Retman
2025-08-12 13:23 ` [PATCH v4 12/18] x86: Minimal SLAB alignment Maciej Wieczor-Retman
2025-08-12 13:23 ` [PATCH v4 13/18] kasan: arm64: x86: Handle int3 for inline KASAN reports Maciej Wieczor-Retman
2025-08-13 14:49 ` Ada Couprie Diaz
2025-08-18 5:57 ` Maciej Wieczor-Retman
2025-08-13 15:17 ` Peter Zijlstra [this message]
2025-08-18 6:26 ` Maciej Wieczor-Retman
2025-09-08 15:40 ` Peter Zijlstra
2025-09-09 8:47 ` Maciej Wieczor-Retman
2025-08-12 13:23 ` [PATCH v4 14/18] kasan: x86: Apply multishot to the inline report handler Maciej Wieczor-Retman
2025-08-12 13:23 ` [PATCH v4 15/18] kasan: x86: Logical bit shift for kasan_mem_to_shadow Maciej Wieczor-Retman
2025-08-12 13:23 ` [PATCH v4 16/18] mm: Unpoison pcpu chunks with base address tag Maciej Wieczor-Retman
2025-08-12 13:23 ` [PATCH v4 17/18] mm: Unpoison vms[area] addresses with a common tag Maciej Wieczor-Retman
2025-08-12 13:23 ` [PATCH v4 18/18] x86: Make software tag-based kasan available Maciej Wieczor-Retman
2025-08-13 8:16 ` [PATCH v4 00/18] kasan: x86: arm64: KASAN tag-based mode for x86 Kiryl Shutsemau
2025-08-13 10:39 ` Maciej Wieczor-Retman
2025-08-13 11:05 ` Kiryl Shutsemau
2025-08-13 11:44 ` Maciej Wieczor-Retman
2025-08-21 12:30 ` Ada Couprie Diaz
2025-08-22 7:36 ` Maciej Wieczor-Retman
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