diff options
| author | Vincenzo Frascino <vincenzo.frascino@arm.com> | 2021-03-15 13:20:14 +0000 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2021-04-11 10:56:39 +0100 |
| commit | 8f7b5054755e48cc7b217a41e3f1891e01338d2f (patch) | |
| tree | 19802576e2cd4d139903fae11c66047197895f50 /mm/kasan | |
| parent | c137c6145b11dc513407bd2e4406cf0a7b8a217d (diff) | |
kasan: Add report for async mode
KASAN provides an asynchronous mode of execution.
Add reporting functionality for this mode.
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Konovalov <andreyknvl@google.com>
Reviewed-by: Andrey Konovalov <andreyknvl@google.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Andrey Konovalov <andreyknvl@google.com>
Tested-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Link: https://lore.kernel.org/r/20210315132019.33202-5-vincenzo.frascino@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'mm/kasan')
| -rw-r--r-- | mm/kasan/kasan.h | 16 | ||||
| -rw-r--r-- | mm/kasan/report.c | 17 |
2 files changed, 32 insertions, 1 deletions
diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h index a3d0d165d97d..02e9656b857f 100644 --- a/mm/kasan/kasan.h +++ b/mm/kasan/kasan.h @@ -7,17 +7,33 @@ #include <linux/stackdepot.h> #ifdef CONFIG_KASAN_HW_TAGS + #include <linux/static_key.h> + DECLARE_STATIC_KEY_FALSE(kasan_flag_stacktrace); +extern bool kasan_flag_async __ro_after_init; + static inline bool kasan_stack_collection_enabled(void) { return static_branch_unlikely(&kasan_flag_stacktrace); } + +static inline bool kasan_async_mode_enabled(void) +{ + return kasan_flag_async; +} #else + static inline bool kasan_stack_collection_enabled(void) { return true; } + +static inline bool kasan_async_mode_enabled(void) +{ + return false; +} + #endif extern bool kasan_flag_panic __ro_after_init; diff --git a/mm/kasan/report.c b/mm/kasan/report.c index 87b271206163..8b0843a2cdd7 100644 --- a/mm/kasan/report.c +++ b/mm/kasan/report.c @@ -87,7 +87,8 @@ static void start_report(unsigned long *flags) static void end_report(unsigned long *flags, unsigned long addr) { - trace_error_report_end(ERROR_DETECTOR_KASAN, addr); + if (!kasan_async_mode_enabled()) + trace_error_report_end(ERROR_DETECTOR_KASAN, addr); pr_err("==================================================================\n"); add_taint(TAINT_BAD_PAGE, LOCKDEP_NOW_UNRELIABLE); spin_unlock_irqrestore(&report_lock, *flags); @@ -360,6 +361,20 @@ void kasan_report_invalid_free(void *object, unsigned long ip) end_report(&flags, (unsigned long)object); } +#ifdef CONFIG_KASAN_HW_TAGS +void kasan_report_async(void) +{ + unsigned long flags; + + start_report(&flags); + pr_err("BUG: KASAN: invalid-access\n"); + pr_err("Asynchronous mode enabled: no access details available\n"); + pr_err("\n"); + dump_stack(); + end_report(&flags, 0); +} +#endif /* CONFIG_KASAN_HW_TAGS */ + static void __kasan_report(unsigned long addr, size_t size, bool is_write, unsigned long ip) { |