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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?kGKGWXeuGjshFyK+/jL6deP46+hFy4UqjR+6nsWmipnf7M0dzWPX9qZGAcGD?= =?us-ascii?Q?kIEO7V/cs7DtEgaWXeQE1q67tTXzvWgDZLfYDhLhu8vokoFGD60KoEtZRrpr?= =?us-ascii?Q?Cv03xVlBx3VGrTla1NX7LHa6iZWTGqOsuxHbBDNHPksOyj0fHqBZWMJtrQYb?= =?us-ascii?Q?T0cPh/Nx8MmDKinWC4VDe7rTRVPHbw11rsvI3QA2le6Ez0dr42hRjGYgvokB?= =?us-ascii?Q?QAyEZGatHc3yarrNTlEzR2NtTMx5+GwIONzEea2jM0kZdH5uylLUnJ07Qw8f?= =?us-ascii?Q?GWntJ8ogSA+T1nMkGctLfUkByKSbgG4pJE7qynD0m28UjiVS76qXqJQyH5oJ?= =?us-ascii?Q?LBYE4cbc6J8C4nOMe2MdYF79MUUiGfM4d08x2ePxWyHGX1qcRvVso26KkY+5?= =?us-ascii?Q?K6QEmtI5PXgT88wUvx7ZYObmD5QRRGCzkESfuXHwxt9QPYI8g/brbNru2Evs?= =?us-ascii?Q?wtAZlHGUWup4hJHbdC0CoZT56y38IAMis1wmgLh9Y9b4SDDZzZQ1LtgVti0e?= =?us-ascii?Q?guxNGuoG9Ox/Xm+49RWRIjoSkg/icus0rOrHT6N/qt1A8qnznOeXRisWvJr4?= =?us-ascii?Q?b4jRNj/lnTji/0s5aPtYQjkjm3qhiuS0tdgww5PuDXg0K2t4nhrZD0n7Md0R?= =?us-ascii?Q?WawjloTcjFQyaJ4sEQSvwtjuNvK96RJjhInX7gmeT0pCggOrTIbB9HdGdISs?= =?us-ascii?Q?8aNXSTkOr1FoSoaLUc3hd2peP2M+ZwWKLOuNBpb4qlVDwrCf05JYUIIBZzX2?= =?us-ascii?Q?AdUcTC+TE3mvO6FDMvZdWM10kq0ReSQ3DcE4+8ebCgAw6d5bC4cOj5X+e1XW?= =?us-ascii?Q?EMTEPUE3ZLnTtuFcTkp8Iww7eK7lasrHaCzeAAUiIo6LWYTeAFNUwC/wTDN9?= =?us-ascii?Q?EqEuGeK73hPMNbkQHYTeCbm2B5TDCAPf02hgdERxJX+WHxaiKBAyGyZ/D43P?= =?us-ascii?Q?YwLObNDJG2HTlOIDNld0RgnMsBkw1gD0uDaVUusbkvNg2ZpRXF+yZxvcn1yu?= =?us-ascii?Q?PGvlW2ma8+V9XtnUpnTaHT+d3e4HOVMjbfgrvhtAX/dE8xW2S54dyis4gB1g?= =?us-ascii?Q?xFwsxsaz3x9krabBjlyxLOc40RwrkTFWftrYRu3u3b87uxexFZdsIGdl/9k2?= =?us-ascii?Q?Swq7lB/SarcBjxY+a9qhW+VjAqc+aFxQ74PRxI0b+gaBtplqWSQ3nCTN3Wjg?= =?us-ascii?Q?c6WFZoNs7KSEZoO19TfQuOwzAvW4mH0PBgE5vla7ChYl9ernVURW5WQn8g55?= =?us-ascii?Q?5HT5VgromrYknphRmt1kDYabRCHuhtn3N218etILa77tmu4rQIhGu8/zdlx4?= =?us-ascii?Q?teio1oFEUnY7Abv32j76FS+KZopO5I7nGNSAl6LPzA8gBtx1z/3bHeLXbV0n?= =?us-ascii?Q?qhhQE9zFZn/0e6QWBMKf4Fj32eomBDueqk6SJ8q47Xsdim2pESk947L7qZgh?= =?us-ascii?Q?+3Y67Jf9dQHfOaNfK9c9sAFORqRyKKtcsOLDydem49sS+gfiJa1GAZP+97oE?= =?us-ascii?Q?SCfbJLZsU80k7G29eCNNlaPXbj+vviAa4DlUrd3EzST45SKm9bI5PrzwGQaM?= =?us-ascii?Q?j4yrnsqN6EFJsCWJd14jaoavlySCTQmN+Jt2TEsUCNGy37DsPgeehkg11mvP?= =?us-ascii?Q?+Q=3D=3D?= X-MS-Exchange-CrossTenant-Network-Message-Id: b966ab5c-2e4b-4743-381d-08da7fa7a819 X-MS-Exchange-CrossTenant-AuthSource: SJ1PR11MB6201.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 16 Aug 2022 16:52:08.3931 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: H6LoxQb7rUHBJhTu1wYGOCcudDuv5InRQKAZ3106X6hdqoToulRx6gYpIrWveqXTBMGYDOfm0AYLl5M2u78BLw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN6PR11MB1426 X-OriginatorOrg: intel.com Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Aug 16, 2022 at 02:41:39PM +0200, Borislav Petkov wrote: > On Tue, Aug 16, 2022 at 09:00:14AM +0000, Ashok Raj wrote: > > A re-application means, you want to apply even if the cpu_rev <= patch.rev > > Yes. I see, so we probably shouldn't remove the rev check completely but just permit to reload if the rev is equal? > > > if cpu_rev is > patch_rev, clearly its ahead?. say BIOS has a newer > > version than in the initrd image, do we want to replace the BIOS > > version since we do no revid checks here. > > Can you even downgrade the microcode through the MSR? I'm not sure what is true for AMD. For Intel's there is a Security Version Number in the signed encrypted part of the microcode. As long as the new image has SVN >= what the CPU's SVN is you can update the microcode. So if a rev2 is loaded, and rev1 is the new MCU, and rev2 and rev1 have the same SVN, you can go down rev from rev2->rev1 where rev2 > rev1. Microcode enforcement for rollback protection has been the SVN. Version number is a SW feel good thing to identifying which image you are running, not intended for preventing rollback or any security enforcement. Cheers, Ashok