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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 01 Sep 2025 20:31:41.3157 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 8c75e5ae-5eb1-4fd3-a9b7-08dde9968f3d X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[4.158.2.129];Helo=[outbound-uk1.az.dlp.m.darktrace.com] X-MS-Exchange-CrossTenant-AuthSource: AM2PEPF0001C711.eurprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS8PR08MB6264 > On Mon, 1 Sep 2025 11:46:22 +0100 Yeoreum Yun wrote: > > > Since Armv8.9, FEATURE_MTE_STORE_ONLY feature is introduced to restrict > > raise of tag check fault on store operation only. > > Introcude KASAN write only mode based on this feature. > > > > KASAN write only mode restricts KASAN checks operation for write only and > > omits the checks for fetch/read operations when accessing memory. > > So it might be used not only debugging enviroment but also normal > > enviroment to check memory safty. > > > > This features can be controlled with "kasan.write_only" arguments. > > When "kasan.write_only=on", KASAN checks write operation only otherwise > > KASAN checks all operations. > > > > This changes the MTE_STORE_ONLY feature as BOOT_CPU_FEATURE like > > ARM64_MTE_ASYMM so that makes it initialise in kasan_init_hw_tags() > > with other function together. > > > > ... > > > > > > - pr_info("KernelAddressSanitizer initialized (hw-tags, mode=%s, vmalloc=%s, stacktrace=%s)\n", > > + pr_info("KernelAddressSanitizer initialized (hw-tags, mode=%s, vmalloc=%s, stacktrace=%s, write_only=%s\n", > > kasan_mode_info(), > > This lost the closing ")" in the printk control string. I fixed that > up while resolving rejects. Oops.. Thanks and Sorry for my mistake :( ... -- Sincerely, Yeoreum Yun