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Shutemov" , Andi Kleen , tony.luck@intel.com, marcorr@google.com, sathyanarayanan.kuppuswamy@linux.intel.com Subject: Re: [PATCH Part1 v5 23/38] x86/head/64: set up a startup %gs for stack protector Message-ID: <20210827133831.xfdw7z55q6ixpgjg@amd.com> References: <20210820151933.22401-1-brijesh.singh@amd.com> <20210820151933.22401-24-brijesh.singh@amd.com> <20210825151835.wzgabnl7rbrge3a2@amd.com> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-ClientProxiedBy: SA0PR11CA0131.namprd11.prod.outlook.com (2603:10b6:806:131::16) To CH2PR12MB4133.namprd12.prod.outlook.com (2603:10b6:610:7a::13) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from localhost (165.204.77.11) by SA0PR11CA0131.namprd11.prod.outlook.com (2603:10b6:806:131::16) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4457.20 via Frontend Transport; Mon, 30 Aug 2021 15:55:45 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 138c378a-672a-4473-b11f-08d96bcea13e X-MS-TrafficTypeDiagnostic: CH2PR12MB4246: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:6430; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?6wLt2Wbs30WbhOtwdlUTdvBbuCqKWhkysZwK1pyUamx/MLi1LrzfDyrDN8tJ?= =?us-ascii?Q?4wk8lDd3sna1eBFTcEZ2F4VOy+EcIUwvPIIUoD9DqpWqFCIDEQa7JzfadfwV?= =?us-ascii?Q?8svh64LBI2i8myLwRLuqb4rBTMTY+wSTLTSDzHYeYAAUwnEBVQGDoP8j3qQ+?= =?us-ascii?Q?iME8HvE030TRjTdTcfTuqYcUjHVAo3/ylLiXL9ZGlA91xQt2A7p5S+Zmjhmz?= =?us-ascii?Q?PJQxkEoUEjL6RX/xuCu6RCQVg82tz346HVin/RwjN9gsJo6KYNKZTWtX5kDa?= =?us-ascii?Q?xS6Jjigpri4YPBl+ouO+FmuMr6YFyGvcnwTBJz0aftfiWY1K0Eovu4dWMhX2?= =?us-ascii?Q?LS7v/IAtIIQoD74ec8w3C1Xx/G+EmpRU8sRP798EPU7H20ku1NUOL/o28kdc?= =?us-ascii?Q?MFZIUN+sUepxTvqIOTmhPLSQrztskxZTV33NKz/XtVam4kWPyNNt1QkcpWa7?= =?us-ascii?Q?ElIOVJ4rbIjGeqUTDwpyCSyuwJoojO2oTNnAUHVgy0dPykFZeO8Gut6DMmeA?= =?us-ascii?Q?dV7PI8tdVfPpMFnZoKTkhBz9oZLmHLSsg3Hak2wP+RfPxg+l/NoZXkZot5oP?= =?us-ascii?Q?w4He3codYHNj5r+cBHZy3WDXAyEyvNZbjg0+xGYL2Zp04D9gxhRqR5PjEvaw?= =?us-ascii?Q?v10uFTdmkvLXmzXlPXzlHOl/a4xFWb9CiS+9tweMqdyEu07EZR5xkPPE9sdA?= =?us-ascii?Q?M+l/K2OgOxC/Sr9Sx3Au2w/2cTYgC0uwSziZTKvW0dVSmEDFrVi9ncJpUVcI?= =?us-ascii?Q?pwsQpDaivgurl35WNvvHmEUEAcfiAqLuy7gnNd6EoqOr957UH63GNGRI9sX6?= =?us-ascii?Q?uzW+T7LFoD9/Ct5HRcyqJNjzQb9iq14/WqvwZGZs9GMnrYNxhsnXhYhmd5+t?= =?us-ascii?Q?MXt2Gw7gqQ7B7t4yZ5UktM8BY0BBwgqa+x3pIInubsOAyOyeP1u2h+CYQtC3?= =?us-ascii?Q?xzMZWHyLqwcAuAmZH6BX6c2p7aKkLbc+JjixyFp+KVPLeHI9EFB26SRNAQP3?= =?us-ascii?Q?I4w2Lij4uuJ35Ii8p0XJ2K4dkhLv5ZHkNgvdR9TYpWVUrWX1UobSyjqK5xwN?= =?us-ascii?Q?7/kRJ+k0Cuqm3E/rcvszLXEQDDRXP6FKMHcXg6XXq8FrZzBt83nqGMl6FYXg?= =?us-ascii?Q?H8upeqOz8iYnm5C/fcC0U/GUQh7QSN64iFwEG1cgL1o910/vNVdRot6Z2gcH?= =?us-ascii?Q?zXySuE27y5p1tYkWrhCxl+7yF8OwU00u5UjSLaQYCbgHjFatOOYaMm3nbotJ?= =?us-ascii?Q?IiE8y3gXgmf/WeJkF9zkY0eDRfQKx2vkvYhBivwm/4FHQLQ7oSJB2whoJhSh?= =?us-ascii?Q?lAZ5k8c+zi10miatBPgUpwmS?= X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: 138c378a-672a-4473-b11f-08d96bcea13e X-MS-Exchange-CrossTenant-AuthSource: CH2PR12MB4133.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 30 Aug 2021 15:55:46.5716 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: B550rWyUNiEzffUjO6L8uI5bzjIAO2Dc8w3sYBE1CcgZetItsdmaJuMBS5Z6tTMIf0CxH7gjp2UgKkcVk1rtEw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH2PR12MB4246 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Aug 25, 2021 at 06:29:31PM +0200, Borislav Petkov wrote: > On Wed, Aug 25, 2021 at 10:18:35AM -0500, Michael Roth wrote: > > On Wed, Aug 25, 2021 at 04:29:13PM +0200, Borislav Petkov wrote: > > > On Fri, Aug 20, 2021 at 10:19:18AM -0500, Brijesh Singh wrote: > > > > From: Michael Roth > > > > > > > > As of commit 103a4908ad4d ("x86/head/64: Disable stack protection for > > > > head$(BITS).o") kernel/head64.c is compiled with -fno-stack-protector > > > > to allow a call to set_bringup_idt_handler(), which would otherwise > > > > have stack protection enabled with CONFIG_STACKPROTECTOR_STRONG. While > > > > sufficient for that case, this will still cause issues if we attempt to > ^^^ > > I'm tired of repeating the same review comments with you guys: > > Who's "we"? > > Please use passive voice in your text: no "we" or "I", etc. > Personal pronouns are ambiguous in text, especially with so many > parties/companies/etc developing the kernel so let's avoid them please. That had also been fixed in the commit message fixup that got clobbered, but I still missed it in one of the comments as well so I'll be more careful of this. > > How about you pay more attention? I've been periodically revising/rewording my comments since I saw you're original comments to Brijesh a few versions back, but it's how I normally talk when discussing code with people so it keeps managing to sneak back in. I've added a git hook to check for this and found other instances that need fixing as well, so hopefully with the help of technology I can get them all sorted for the next spin. > > > I didn't realize the the 32-bit path was something you were suggesting > > to have added in this patch, but I'll take a look at that as well. > > If you're going to remove the -no-stack-protector thing for that file, > then pls remove it for both 32- and 64-bit. I.e., the revert what > 103a4908ad4d did. Got it, will do. > > -- > Regards/Gruss, > Boris. > > https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fpeople.kernel.org%2Ftglx%2Fnotes-about-netiquette&data=04%7C01%7Cmichael.roth%40amd.com%7Cdfceeb76d2a4481da83f08d967e57220%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637655057436180426%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=aAKQ%2B7mXBvL4oofk0y7CacaMMD8Ucg8YL5hB4nw7zgo%3D&reserved=0