linux-kernel - Re: [PATCH v8 03/14] kasan: Fix inline mode for x86 tag-based mode

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Message-ID: <1f821f5a-403b-4dad-b9d8-239c9b039000@gmail.com>
Date: Fri, 16 Jan 2026 14:33:33 +0100
From: Andrey Ryabinin <ryabinin.a.a@...il.com>
To: Maciej Wieczor-Retman <m.wieczorretman@...me>,
 Alexander Potapenko <glider@...gle.com>,
 Andrey Konovalov <andreyknvl@...il.com>, Dmitry Vyukov <dvyukov@...gle.com>,
 Vincenzo Frascino <vincenzo.frascino@....com>,
 Nathan Chancellor <nathan@...nel.org>, Nicolas Schier <nsc@...nel.org>,
 Nick Desaulniers <nick.desaulniers+lkml@...il.com>,
 Bill Wendling <morbo@...gle.com>, Justin Stitt <justinstitt@...gle.com>
Cc: Maciej Wieczor-Retman <maciej.wieczor-retman@...el.com>,
 kasan-dev@...glegroups.com, linux-kbuild@...r.kernel.org,
 linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH v8 03/14] kasan: Fix inline mode for x86 tag-based mode



On 1/12/26 6:27 PM, Maciej Wieczor-Retman wrote:
> From: Maciej Wieczor-Retman <maciej.wieczor-retman@...el.com>
> 
> The LLVM compiler uses hwasan-instrument-with-calls parameter to setup
> inline or outline mode in tag-based KASAN. If zeroed, it means the
> instrumentation implementation will be pasted into each relevant
> location along with KASAN related constants during compilation. If set
> to one all function instrumentation will be done with function calls
> instead.
> 
> The default hwasan-instrument-with-calls value for the x86 architecture
> in the compiler is "1", which is not true for other architectures.
> Because of this, enabling inline mode in software tag-based KASAN
> doesn't work on x86 as the kernel script doesn't zero out the parameter
> and always sets up the outline mode.
> 
> Explicitly zero out hwasan-instrument-with-calls when enabling inline
> mode in tag-based KASAN.
> 
> Signed-off-by: Maciej Wieczor-Retman <maciej.wieczor-retman@...el.com>
> Reviewed-by: Andrey Konovalov <andreyknvl@...il.com>
> Reviewed-by: Alexander Potapenko <glider@...gle.com>
> ---

Reviewed-by: Andrey Ryabinin <ryabinin.a.a@...il.com>