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X-CSE-ConnectionGUID: UUaqZRvhSRWsvVtukhKwGA== X-CSE-MsgGUID: pZstcwLQSBG2/iuTrsRMeQ== X-IronPort-AV: E=McAfee;i="6800,10657,11527"; a="57208915" X-IronPort-AV: E=Sophos;i="6.17,306,1747724400"; d="scan'208";a="57208915" Received: from orviesa006.jf.intel.com ([10.64.159.146]) by fmvoesa112.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Aug 2025 14:36:04 -0700 X-CSE-ConnectionGUID: +YD530azQKe4k//YhQWqZg== X-CSE-MsgGUID: H5hhtntJTkGgWxEkbADicg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.17,306,1747724400"; d="scan'208";a="167446059" Received: from lstrano-mobl6.amr.corp.intel.com (HELO [10.125.108.83]) ([10.125.108.83]) by orviesa006-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Aug 2025 14:36:04 -0700 Message-ID: <1ede0349-320e-493e-a3fe-bc72efa4fd44@intel.com> Date: Wed, 20 Aug 2025 14:36:02 -0700 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH -next] x86: Prevent KASAN false positive warnings in __show_regs() To: Tengda Wu , x86@kernel.org Cc: Andrey Ryabinin , Thomas Gleixner , Alexander Potapenko , Andrey Konovalov , Borislav Petkov , Dave Hansen , Dmitry Vyukov , Ingo Molnar , linux-kernel@vger.kernel.org References: <20250818130715.2904264-1-wutengda@huaweicloud.com> From: Dave Hansen Content-Language: en-US Autocrypt: addr=dave.hansen@intel.com; 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charset=UTF-8 Content-Transfer-Encoding: 7bit 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?