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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 03 Sep 2024 09:05:47.9993 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 1061f0e5-1278-4615-4ea2-08dccbf799ff X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[63.35.35.123];Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-AuthSource: AM1PEPF000252DC.eurprd07.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM7PR08MB5525 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240903_020559_846354_5C572FC0 X-CRM114-Status: GOOD ( 10.58 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, Aug 29, 2024 at 12:27:39AM +0100, Mark Brown wrote: > As discussed extensively in the changelog for the addition of this > syscall on x86 ("x86/shstk: Introduce map_shadow_stack syscall") the > existing mmap() and madvise() syscalls do not map entirely well onto the > security requirements for guarded control stacks since they lead to > windows where memory is allocated but not yet protected or stacks which > are not properly and safely initialised. Instead a new syscall > map_shadow_stack() has been defined which allocates and initialises a > shadow stack page. > > Implement this for arm64. Two flags are provided, allowing applications > to request that the stack be initialised with a valid cap token at the > top of the stack and optionally also an end of stack marker above that. > We support requesting an end of stack marker alone but since this is a > NULL pointer it is indistinguishable from not initialising anything by > itself. > > Reviewed-by: Thiago Jung Bauermann > Reviewed-by: Catalin Marinas > Signed-off-by: Mark Brown Acked-by: Yury Khrustalev