From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 6D10ECA5FAD for ; Tue, 20 Jan 2026 16:38:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:From:References:Cc:To: Subject:MIME-Version:Date:Message-ID:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=LlEd5UmEZYA9KwdDxhuHpt+m9TYsLqjCXe8FMWK4I/I=; b=Z7iqUX89ZIxEpw 2PCTztIjxag9i+u1fmktt97vqlumO2qHpXd2hNF5WvMA70Dw6YAR6sOcfuYM1cjF1p0isEhYHgrz+ qsPzwFn1QOOM/G1KL9QfehiIiN8uYOxCk+IZ3BTfCED8QhiCEsqdQu0GiTmkwz6c7d5h3jfbGzAJQ UkCB7llCYkgip58Pc4TO7l7IbJBSe6FUwXOW90jQ7M66+3reSbsQexdn/gco9s+ktUL9GQN52Y5S7 3lxkdOSN6DgzFJOHe5JICNyYeWyC+gRrjmgi3J7RGyeEFXpZjlGvGHQn3zZyni7yyIh5JDc9nHVtE 0KGEzNGXvhzCweHgwRXg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1viEjn-00000004BPY-0ZuR; Tue, 20 Jan 2026 16:37:51 +0000 Received: from mgamail.intel.com ([192.198.163.19]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1viEjj-00000004BOg-3wOt; Tue, 20 Jan 2026 16:37:49 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1768927067; x=1800463067; h=message-id:date:mime-version:subject:to:cc:references: from:in-reply-to:content-transfer-encoding; bh=l6zt9Aq16n1bm0FvTo8vindZbxHrJGqWuAngHOx6RHU=; b=GAaCmbrqlIqXiJQMsSktCjG5f9iSqRTyGt0JRS4MFmt1RyuGtg9wdIxS OapoWbBsIJClmnbz/Q8LM6oaccg87AoJ6BLngTfUtL8fhToxdgipF1ffe yi6b1wH+BH5V6goSB3q6cPMA7+D2QHw3ihHKJMG1k01NUGaM+4V3GQ+s/ 02RNmJDZLUlo1icIQ63pFjJ1YSfGaPUVDiuFJce4VjQQi+sAy8z6+oUb9 ppP4V5CrmwC7ItIQocwaEU5mBPICBzpn4lRZ2knRSCn8qHPYxJzrO+Baw J7ffmFrY/sdXPCWAr9sTkxBrOESU4wngpljY0lcaCWatWiuUvtxRlzqaJ A==; X-CSE-ConnectionGUID: z6A3SGNRT/eCzFwGk70dOg== X-CSE-MsgGUID: xw6BiVrRTMOuWvmTpw3NQw== X-IronPort-AV: E=McAfee;i="6800,10657,11677"; a="69156589" X-IronPort-AV: E=Sophos;i="6.21,241,1763452800"; d="scan'208";a="69156589" Received: from fmviesa008.fm.intel.com ([10.60.135.148]) by fmvoesa113.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Jan 2026 08:37:46 -0800 X-CSE-ConnectionGUID: i8YmVT04SAqzglnbuUMMhg== X-CSE-MsgGUID: ukbzNSMQRBCd4IS3CMSH7Q== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.21,241,1763452800"; d="scan'208";a="206422303" Received: from vverma7-desk1.amr.corp.intel.com (HELO [10.125.108.22]) ([10.125.108.22]) by fmviesa008-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Jan 2026 08:37:44 -0800 Message-ID: Date: Tue, 20 Jan 2026 08:37:43 -0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 0/3] Fix bugs and performance of kstack offset randomisation To: Ryan Roberts , Kees Cook , Catalin Marinas , Will Deacon , Huacai Chen , Madhavan Srinivasan , Michael Ellerman , Paul Walmsley , Palmer Dabbelt , Albert Ou , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "Gustavo A. R. Silva" , Arnd Bergmann , Mark Rutland , "Jason A. Donenfeld" , Ard Biesheuvel , Jeremy Linton , David Laight Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, loongarch@lists.linux.dev, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-hardening@vger.kernel.org References: <20260119130122.1283821-1-ryan.roberts@arm.com> <20fb97f1-7e50-485a-bdfd-a2901d20ec84@intel.com> <785a7d90-babe-43af-93a6-c220c1877bcf@arm.com> From: Dave Hansen Content-Language: en-US Autocrypt: addr=dave.hansen@intel.com; keydata= xsFNBE6HMP0BEADIMA3XYkQfF3dwHlj58Yjsc4E5y5G67cfbt8dvaUq2fx1lR0K9h1bOI6fC oAiUXvGAOxPDsB/P6UEOISPpLl5IuYsSwAeZGkdQ5g6m1xq7AlDJQZddhr/1DC/nMVa/2BoY 2UnKuZuSBu7lgOE193+7Uks3416N2hTkyKUSNkduyoZ9F5twiBhxPJwPtn/wnch6n5RsoXsb ygOEDxLEsSk/7eyFycjE+btUtAWZtx+HseyaGfqkZK0Z9bT1lsaHecmB203xShwCPT49Blxz VOab8668QpaEOdLGhtvrVYVK7x4skyT3nGWcgDCl5/Vp3TWA4K+IofwvXzX2ON/Mj7aQwf5W iC+3nWC7q0uxKwwsddJ0Nu+dpA/UORQWa1NiAftEoSpk5+nUUi0WE+5DRm0H+TXKBWMGNCFn c6+EKg5zQaa8KqymHcOrSXNPmzJuXvDQ8uj2J8XuzCZfK4uy1+YdIr0yyEMI7mdh4KX50LO1 pmowEqDh7dLShTOif/7UtQYrzYq9cPnjU2ZW4qd5Qz2joSGTG9eCXLz5PRe5SqHxv6ljk8mb ApNuY7bOXO/A7T2j5RwXIlcmssqIjBcxsRRoIbpCwWWGjkYjzYCjgsNFL6rt4OL11OUF37wL QcTl7fbCGv53KfKPdYD5hcbguLKi/aCccJK18ZwNjFhqr4MliQARAQABzUVEYXZpZCBDaHJp c3RvcGhlciBIYW5zZW4gKEludGVsIFdvcmsgQWRkcmVzcykgPGRhdmUuaGFuc2VuQGludGVs LmNvbT7CwXgEEwECACIFAlQ+9J0CGwMGCwkIBwMCBhUIAgkKCwQWAgMBAh4BAheAAAoJEGg1 lTBwyZKwLZUP/0dnbhDc229u2u6WtK1s1cSd9WsflGXGagkR6liJ4um3XCfYWDHvIdkHYC1t MNcVHFBwmQkawxsYvgO8kXT3SaFZe4ISfB4K4CL2qp4JO+nJdlFUbZI7cz/Td9z8nHjMcWYF IQuTsWOLs/LBMTs+ANumibtw6UkiGVD3dfHJAOPNApjVr+M0P/lVmTeP8w0uVcd2syiaU5jB aht9CYATn+ytFGWZnBEEQFnqcibIaOrmoBLu2b3fKJEd8Jp7NHDSIdrvrMjYynmc6sZKUqH2 I1qOevaa8jUg7wlLJAWGfIqnu85kkqrVOkbNbk4TPub7VOqA6qG5GCNEIv6ZY7HLYd/vAkVY E8Plzq/NwLAuOWxvGrOl7OPuwVeR4hBDfcrNb990MFPpjGgACzAZyjdmYoMu8j3/MAEW4P0z F5+EYJAOZ+z212y1pchNNauehORXgjrNKsZwxwKpPY9qb84E3O9KYpwfATsqOoQ6tTgr+1BR CCwP712H+E9U5HJ0iibN/CDZFVPL1bRerHziuwuQuvE0qWg0+0SChFe9oq0KAwEkVs6ZDMB2 P16MieEEQ6StQRlvy2YBv80L1TMl3T90Bo1UUn6ARXEpcbFE0/aORH/jEXcRteb+vuik5UGY 5TsyLYdPur3TXm7XDBdmmyQVJjnJKYK9AQxj95KlXLVO38lczsFNBFRjzmoBEACyAxbvUEhd GDGNg0JhDdezyTdN8C9BFsdxyTLnSH31NRiyp1QtuxvcqGZjb2trDVuCbIzRrgMZLVgo3upr MIOx1CXEgmn23Zhh0EpdVHM8IKx9Z7V0r+rrpRWFE8/wQZngKYVi49PGoZj50ZEifEJ5qn/H Nsp2+Y+bTUjDdgWMATg9DiFMyv8fvoqgNsNyrrZTnSgoLzdxr89FGHZCoSoAK8gfgFHuO54B lI8QOfPDG9WDPJ66HCodjTlBEr/Cwq6GruxS5i2Y33YVqxvFvDa1tUtl+iJ2SWKS9kCai2DR 3BwVONJEYSDQaven/EHMlY1q8Vln3lGPsS11vSUK3QcNJjmrgYxH5KsVsf6PNRj9mp8Z1kIG qjRx08+nnyStWC0gZH6NrYyS9rpqH3j+hA2WcI7De51L4Rv9pFwzp161mvtc6eC/GxaiUGuH BNAVP0PY0fqvIC68p3rLIAW3f97uv4ce2RSQ7LbsPsimOeCo/5vgS6YQsj83E+AipPr09Caj 0hloj+hFoqiticNpmsxdWKoOsV0PftcQvBCCYuhKbZV9s5hjt9qn8CE86A5g5KqDf83Fxqm/ vXKgHNFHE5zgXGZnrmaf6resQzbvJHO0Fb0CcIohzrpPaL3YepcLDoCCgElGMGQjdCcSQ+Ci FCRl0Bvyj1YZUql+ZkptgGjikQARAQABwsFfBBgBAgAJBQJUY85qAhsMAAoJEGg1lTBwyZKw l4IQAIKHs/9po4spZDFyfDjunimEhVHqlUt7ggR1Hsl/tkvTSze8pI1P6dGp2XW6AnH1iayn yRcoyT0ZJ+Zmm4xAH1zqKjWplzqdb/dO28qk0bPso8+1oPO8oDhLm1+tY+cOvufXkBTm+whm +AyNTjaCRt6aSMnA/QHVGSJ8grrTJCoACVNhnXg/R0g90g8iV8Q+IBZyDkG0tBThaDdw1B2l asInUTeb9EiVfL/Zjdg5VWiF9LL7iS+9hTeVdR09vThQ/DhVbCNxVk+DtyBHsjOKifrVsYep WpRGBIAu3bK8eXtyvrw1igWTNs2wazJ71+0z2jMzbclKAyRHKU9JdN6Hkkgr2nPb561yjcB8 sIq1pFXKyO+nKy6SZYxOvHxCcjk2fkw6UmPU6/j/nQlj2lfOAgNVKuDLothIxzi8pndB8Jju KktE5HJqUUMXePkAYIxEQ0mMc8Po7tuXdejgPMwgP7x65xtfEqI0RuzbUioFltsp1jUaRwQZ MTsCeQDdjpgHsj+P2ZDeEKCbma4m6Ez/YWs4+zDm1X8uZDkZcfQlD9NldbKDJEXLIjYWo1PH hYepSffIWPyvBMBTW2W5FRjJ4vLRrJSUoEfJuPQ3vW9Y73foyo/qFoURHO48AinGPZ7PC7TF vUaNOTjKedrqHkaOcqB185ahG2had0xnFsDPlx5y In-Reply-To: <785a7d90-babe-43af-93a6-c220c1877bcf@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260120_083747_988910_8BAFA3B6 X-CRM114-Status: GOOD ( 12.99 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org T24gMS8yMC8yNiAwODozMiwgUnlhbiBSb2JlcnRzIHdyb3RlOgo+IEkgZG9uJ3QgdGhpbmsgdGhp cyBxdWVzdGlvbiB3YXMgcmVhbGx5IGFkZHJlc3NlZCB0byBtZSwgYnV0IEknbGwgZ2l2ZSBteSBv cGluaW9uCj4gYW55d2F5OyBJIGFncmVlIGl0J3MgcHJldHR5IGJpbmFyeSAtIGl0IHdpbGwgZWl0 aGVyIHdvcmsgb3IgaXQgd2lsbCBleHBsb2RlLgo+IEkndmUgdGVzdGVkIG9uIGFybTY0IGFuZCB4 ODZfNjQgc28gSSBoYXZlIGhpZ2ggY29uZmlkZW5jZSB0aGF0IGl0IHdvcmtzLiBJZiB5b3UKPiBn ZXQgaXQgaW50byAtbmV4dCBBU0FQIGl0IGhhcyAzIHdlZWtzIHRvIHNvYWsgYmVmb3JlIHRoZSBt ZXJnZSB3aW5kb3cgb3BlbnMKPiByaWdodD8gKExpbnVzIHNhaWQgaGUgd291bGQgZG8gYW4gLXJj OCB0aGlzIGN5Y2xlKS4gVGhhdCBmZWVscyBsaWtlIGVub3VnaCB0aW1lCj4gdG8gbWUuIEJ1dCBp dCdzIHlvdXIgdHJlZSDwn5iJCgpGaXJzdCBvZiBhbGwsIHRoYW5rIHlvdSBmb3IgdGVzdGluZyBp dCBvbiB4ODYhIEhhdmluZyB0aGF0IG9uZSBkYXRhCnBvaW50IHdoZXJlIGl0IGhlbHBlZCBwZXJm b3JtYW5jZSBpcyBzdXBlciB2YWx1YWJsZS4KCkknbSBtb3JlIHdvcnJpZWQgdGhhdCBpdCdzIGdv aW5nIHRvIHJlZ3Jlc3MgcGVyZm9ybWFuY2Ugc29tZXdoZXJlIGFuZAp0aGVuIGl0J3MgZ29pbmcg dG8gYmUgYSBwYWluIHRvIGJhY2sgb3V0LiBJJ20gbm90IHN1cGVyIHdvcnJpZWQgYWJvdXQKZnVu Y3Rpb25hbCByZWdyZXNzaW9ucy4KCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fCmxpbnV4LXJpc2N2IG1haWxpbmcgbGlzdApsaW51eC1yaXNjdkBsaXN0cy5p bmZyYWRlYWQub3JnCmh0dHA6Ly9saXN0cy5pbmZyYWRlYWQub3JnL21haWxtYW4vbGlzdGluZm8v bGludXgtcmlzY3YK