diff options
Diffstat (limited to 'arch/um')
| -rw-r--r-- | arch/um/Kconfig | 1 | ||||
| -rw-r--r-- | arch/um/include/asm/kasan.h | 5 | ||||
| -rw-r--r-- | arch/um/kernel/mem.c | 13 |
3 files changed, 13 insertions, 6 deletions
diff --git a/arch/um/Kconfig b/arch/um/Kconfig index 9083bfdb7735..1d4def0db841 100644 --- a/arch/um/Kconfig +++ b/arch/um/Kconfig @@ -5,6 +5,7 @@ menu "UML-specific options" config UML bool default y + select ARCH_NEEDS_DEFER_KASAN if STATIC_LINK select ARCH_WANTS_DYNAMIC_TASK_STRUCT select ARCH_HAS_CACHE_LINE_SIZE select ARCH_HAS_CPU_FINALIZE_INIT diff --git a/arch/um/include/asm/kasan.h b/arch/um/include/asm/kasan.h index f97bb1f7b851..b54a4e937fd1 100644 --- a/arch/um/include/asm/kasan.h +++ b/arch/um/include/asm/kasan.h @@ -24,10 +24,9 @@ #ifdef CONFIG_KASAN void kasan_init(void); -extern int kasan_um_is_ready; -#ifdef CONFIG_STATIC_LINK -#define kasan_arch_is_ready() (kasan_um_is_ready) +#if defined(CONFIG_STATIC_LINK) && defined(CONFIG_KASAN_INLINE) +#error UML does not work in KASAN_INLINE mode with STATIC_LINK enabled! #endif #else static inline void kasan_init(void) { } diff --git a/arch/um/kernel/mem.c b/arch/um/kernel/mem.c index 76bec7de81b5..32e3b1972dc1 100644 --- a/arch/um/kernel/mem.c +++ b/arch/um/kernel/mem.c @@ -21,10 +21,10 @@ #include <os.h> #include <um_malloc.h> #include <linux/sched/task.h> +#include <linux/kasan.h> #ifdef CONFIG_KASAN -int kasan_um_is_ready; -void kasan_init(void) +void __init kasan_init(void) { /* * kasan_map_memory will map all of the required address space and @@ -32,7 +32,11 @@ void kasan_init(void) */ kasan_map_memory((void *)KASAN_SHADOW_START, KASAN_SHADOW_SIZE); init_task.kasan_depth = 0; - kasan_um_is_ready = true; + /* + * Since kasan_init() is called before main(), + * KASAN is initialized but the enablement is deferred after + * jump_label_init(). See arch_mm_preinit(). + */ } static void (*kasan_init_ptr)(void) @@ -58,6 +62,9 @@ static unsigned long brk_end; void __init arch_mm_preinit(void) { + /* Safe to call after jump_label_init(). Enables KASAN. */ + kasan_init_generic(); + /* clear the zero-page */ memset(empty_zero_page, 0, PAGE_SIZE); |