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X-CSE-ConnectionGUID: Wj5WYw0cSYqZ6NpAgFljVA== X-CSE-MsgGUID: wdv1jgvzR7uJuMl1CjcnzA== X-IronPort-AV: E=McAfee;i="6700,10204,11399"; a="45429971" X-IronPort-AV: E=Sophos;i="6.15,201,1739865600"; d="scan'208";a="45429971" Received: from fmviesa001.fm.intel.com ([10.60.135.141]) by orvoesa112.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Apr 2025 11:29:36 -0700 X-CSE-ConnectionGUID: OYu0cAbzScCswQ/sr0tt1w== X-CSE-MsgGUID: Wx9F5wsaQd2PJHrJj+iwYg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.15,201,1739865600"; d="scan'208";a="159629133" Received: from sramkris-mobl1.amr.corp.intel.com (HELO [10.124.220.195]) ([10.124.220.195]) by smtpauth.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Apr 2025 11:29:32 -0700 Message-ID: Date: Wed, 9 Apr 2025 11:29:30 -0700 Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 10/14] x86: Update the KASAN non-canonical hook To: Maciej Wieczor-Retman Cc: hpa@zytor.com, hch@infradead.org, nick.desaulniers+lkml@gmail.com, kuan-ying.lee@canonical.com, masahiroy@kernel.org, samuel.holland@sifive.com, mingo@redhat.com, corbet@lwn.net, ryabinin.a.a@gmail.com, guoweikang.kernel@gmail.com, jpoimboe@kernel.org, ardb@kernel.org, vincenzo.frascino@arm.com, glider@google.com, kirill.shutemov@linux.intel.com, apopple@nvidia.com, samitolvanen@google.com, kaleshsingh@google.com, jgross@suse.com, andreyknvl@gmail.com, scott@os.amperecomputing.com, tony.luck@intel.com, dvyukov@google.com, pasha.tatashin@soleen.com, ziy@nvidia.com, broonie@kernel.org, gatlin.newhouse@gmail.com, jackmanb@google.com, wangkefeng.wang@huawei.com, thiago.bauermann@linaro.org, tglx@linutronix.de, kees@kernel.org, akpm@linux-foundation.org, jason.andryuk@amd.com, snovitoll@gmail.com, xin@zytor.com, jan.kiszka@siemens.com, bp@alien8.de, rppt@kernel.org, peterz@infradead.org, pankaj.gupta@amd.com, thuth@redhat.com, andriy.shevchenko@linux.intel.com, joel.granados@kernel.org, kbingham@kernel.org, nicolas@fjasle.eu, mark.rutland@arm.com, surenb@google.com, catalin.marinas@arm.com, morbo@google.com, justinstitt@google.com, ubizjak@gmail.com, jhubbard@nvidia.com, urezki@gmail.com, dave.hansen@linux.intel.com, bhe@redhat.com, luto@kernel.org, baohua@kernel.org, nathan@kernel.org, will@kernel.org, brgerst@gmail.com, llvm@lists.linux.dev, linux-mm@kvack.org, linux-doc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, x86@kernel.org References: <8416848c-700a-4ff0-8a22-aa62579d60cd@intel.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 4/9/25 07:34, Maciej Wieczor-Retman wrote: > Yes, I like it more than just generating the addresses in the parenthesis. What > do you think about this naming? KASAN prefix and [k/u]addr since it's not really > the lowest/highest address in the whole LA, just in this KASAN compiler scheme. > And I changed 1<<56 to 2<<56 so it generates 0xFE00000000000000 instead of > 0xFF00000000000000. > > #define KASAN_HIGHEST_KADDR (void *)0xFFFFFFFFFFFFFFFF > #define KASAN_LOWEST_KADDR (void *)(KASAN_HIGHEST_KADDR - \ > (2<<56) + 1) > #define KASAN_HIGHEST_UADDR (void *)0x7FFFFFFFFFFFFFFF > #define KASAN_LOWEST_UADDR (void *)(KASAN_HIGHEST_UADDR - \ > (2<<56) + 1) Yes, that is much better.