From: Andrey Konovalov <andreyknvl@gmail.com>
To: Maciej Wieczor-Retman <maciej.wieczor-retman@intel.com>
Cc: kees@kernel.org, julian.stecklina@cyberus-technology.de,
kevinloughlin@google.com, peterz@infradead.org,
tglx@linutronix.de, justinstitt@google.com,
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thiago.bauermann@linaro.org, linux-doc@vger.kernel.org,
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llvm@lists.linux.dev, linux-mm@kvack.org,
linux-arm-kernel@lists.infradead.org, x86@kernel.org
Subject: Re: [PATCH v2 13/14] x86: runtime_const used for KASAN_SHADOW_END
Date: Sat, 22 Feb 2025 16:08:25 +0100 [thread overview]
Message-ID: <CA+fCnZe1U_nV_ByK2+XjBdXq0WNYzB0f30BsrsZKcxyOSu9cTg@mail.gmail.com> (raw)
In-Reply-To: <ffbyaler57cdwgs5axtdpnwg52jtwx7tx2rykjro755c45mihl@czmbriuhg3to>
On Fri, Feb 21, 2025 at 4:27 PM Maciej Wieczor-Retman
<maciej.wieczor-retman@intel.com> wrote:
>
> Also I was wondering if you know what "hwasan-mapping-offset-dynamic" option is?
> I noticed it in the llvm docs but can't find a good description what it does,
> even from looking at the code in HWAddressSanitizer.cpp. If
> hwasan-mapping-offset is not implemeneted for x86 I doubt this is but maybe it
> could help in a cleaner makefile for x86 at least? Especially once these options
> will be working in x86 llvm.
Yeah, reading the code [1] works better to understand these options.
My understanding is that specifying
-hwasan-mapping-offset-dynamic=global without -hwasan-mapping-offset
would make the generated code get the shadow memory address from the
__hwasan_shadow_memory_dynamic_address global variable. This option is
in the common code, so it should work on x86 too. But I believe it's
intended for userspace, not sure if it would work for the kernel.
Even if we use this option, I don't get how it would make the Makefile
cleaner - to me it already looks clean tbh :) But it will possibly
make KASAN work slower.
[1] https://github.com/llvm/llvm-project/blob/llvmorg-21-init/llvm/lib/Transforms/Instrumentation/HWAddressSanitizer.cpp#L1929
next prev parent reply other threads:[~2025-02-22 15:08 UTC|newest]
Thread overview: 69+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-02-18 8:15 [PATCH v2 00/14] kasan: x86: arm64: KASAN tag-based mode for x86 Maciej Wieczor-Retman
2025-02-18 8:15 ` [PATCH v2 01/14] kasan: sw_tags: Use arithmetic shift for shadow computation Maciej Wieczor-Retman
2025-02-19 23:29 ` Andrey Konovalov
2025-02-21 13:11 ` Maciej Wieczor-Retman
2025-02-22 15:06 ` Andrey Konovalov
2025-02-25 17:20 ` Maciej Wieczor-Retman
2025-02-25 19:12 ` Maciej Wieczor-Retman
2025-02-25 20:12 ` Maciej Wieczor-Retman
2025-02-25 21:38 ` Andrey Konovalov
2025-02-26 16:42 ` Maciej Wieczor-Retman
2025-02-26 19:44 ` Andrey Konovalov
2025-02-27 12:27 ` Maciej Wieczor-Retman
2025-02-28 16:12 ` Maciej Wieczor-Retman
2025-03-01 0:21 ` Andrey Konovalov
2025-03-04 14:06 ` Maciej Wieczor-Retman
2025-03-07 1:10 ` Andrey Konovalov
2025-03-13 14:56 ` Maciej Wieczor-Retman
2025-03-18 15:31 ` Andrey Konovalov
2025-02-25 21:37 ` Andrey Konovalov
2025-02-27 12:33 ` Maciej Wieczor-Retman
2025-03-01 0:22 ` Andrey Konovalov
2025-03-04 12:29 ` Maciej Wieczor-Retman
2025-03-07 1:10 ` Andrey Konovalov
2025-03-14 15:57 ` Maciej Wieczor-Retman
2025-03-18 15:32 ` Andrey Konovalov
2025-02-18 8:15 ` [PATCH v2 02/14] kasan: sw_tags: Check kasan_flag_enabled at runtime Maciej Wieczor-Retman
2025-02-19 23:30 ` Andrey Konovalov
2025-02-21 14:35 ` Maciej Wieczor-Retman
2025-02-18 8:15 ` [PATCH v2 03/14] kasan: sw_tags: Support outline stack tag generation Maciej Wieczor-Retman
2025-02-19 23:30 ` Andrey Konovalov
2025-02-18 8:15 ` [PATCH v2 04/14] kasan: sw_tags: Support tag widths less than 8 bits Maciej Wieczor-Retman
2025-02-18 8:15 ` [PATCH v2 05/14] kasan: arm64: x86: Make special tags arch specific Maciej Wieczor-Retman
2025-02-18 8:15 ` [PATCH v2 06/14] x86: Add arch specific kasan functions Maciej Wieczor-Retman
2025-02-19 23:30 ` Andrey Konovalov
2025-02-21 8:40 ` Maciej Wieczor-Retman
2025-02-18 8:15 ` [PATCH v2 07/14] x86: Reset tag for virtual to physical address conversions Maciej Wieczor-Retman
2025-02-18 8:15 ` [PATCH v2 08/14] x86: Physical address comparisons in fill_p*d/pte Maciej Wieczor-Retman
2025-02-18 8:15 ` [PATCH v2 09/14] mm: Pcpu chunk address tag reset Maciej Wieczor-Retman
2025-03-20 17:39 ` Andrey Ryabinin
2025-03-20 17:47 ` Andrey Konovalov
2025-03-21 10:40 ` Maciej Wieczor-Retman
2025-02-18 8:15 ` [PATCH v2 10/14] x86: KASAN raw shadow memory PTE init Maciej Wieczor-Retman
2025-02-18 8:15 ` [PATCH v2 11/14] x86: LAM initialization Maciej Wieczor-Retman
2025-02-18 8:15 ` [PATCH v2 12/14] x86: Minimal SLAB alignment Maciej Wieczor-Retman
2025-02-19 23:30 ` Andrey Konovalov
2025-02-21 7:24 ` Maciej Wieczor-Retman
2025-02-18 8:15 ` [PATCH v2 13/14] x86: runtime_const used for KASAN_SHADOW_END Maciej Wieczor-Retman
2025-02-19 23:31 ` Andrey Konovalov
2025-02-21 15:10 ` Maciej Wieczor-Retman
2025-02-21 15:27 ` Maciej Wieczor-Retman
2025-02-22 15:08 ` Andrey Konovalov [this message]
2025-02-22 15:07 ` Andrey Konovalov
2025-02-25 17:15 ` Maciej Wieczor-Retman
2025-02-25 21:37 ` Andrey Konovalov
2025-02-26 11:52 ` Maciej Wieczor-Retman
2025-02-26 15:24 ` Andrey Konovalov
2025-02-26 17:03 ` Maciej Wieczor-Retman
2025-03-21 19:20 ` Maciej Wieczor-Retman
2025-03-21 20:16 ` Andrey Konovalov
2025-03-24 10:43 ` Maciej Wieczor-Retman
2025-03-24 10:50 ` Maciej Wieczor-Retman
2025-03-24 21:58 ` Andrey Konovalov
2025-02-18 8:15 ` [PATCH v2 14/14] x86: Make software tag-based kasan available Maciej Wieczor-Retman
2025-02-19 23:31 ` Andrey Konovalov
2025-02-20 16:32 ` Andrey Konovalov
2025-02-21 14:44 ` Maciej Wieczor-Retman
2025-02-22 15:06 ` Andrey Konovalov
2025-02-25 15:39 ` Maciej Wieczor-Retman
2025-02-20 2:49 ` kernel test robot
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