linux-kernel - Re: [PATCH -next] x86: Prevent KASAN false positive warnings in __show

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Message-ID: <1ede0349-320e-493e-a3fe-bc72efa4fd44@intel.com>
Date: Wed, 20 Aug 2025 14:36:02 -0700
From: Dave Hansen <dave.hansen@...el.com>
To: Tengda Wu <wutengda@...weicloud.com>, x86@...nel.org
Cc: Andrey Ryabinin <ryabinin.a.a@...il.com>,
 Thomas Gleixner <tglx@...utronix.de>, Alexander Potapenko
 <glider@...gle.com>, Andrey Konovalov <andreyknvl@...il.com>,
 Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>,
 Dmitry Vyukov <dvyukov@...gle.com>, Ingo Molnar <mingo@...hat.com>,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next] x86: Prevent KASAN false positive warnings in
 __show_regs()

On 8/18/25 06:07, Tengda Wu wrote:
> When process A accesses process B's `regs` from stack memory through
> __show_regs(), the stack of process B keeps changing during runtime.
> This causes false positives like "stack out-of-bounds" [1] or
> "out-of-bounds" [2] warnings when reading `regs` contents.

Could you explain a little bit more how you know that these are false
positives?