KASAN provides an asynchronous mode of execution. Add reporting functionality for this mode.
Cc: Dmitry Vyukov <dvyu...@google.com> Cc: Andrey Ryabinin <aryabi...@virtuozzo.com> Cc: Alexander Potapenko <gli...@google.com> Cc: Andrey Konovalov <andreyk...@google.com> Reviewed-by: Andrey Konovalov <andreyk...@google.com> Signed-off-by: Vincenzo Frascino <vincenzo.frasc...@arm.com> Signed-off-by: Andrey Konovalov <andreyk...@google.com> --- include/linux/kasan.h | 6 ++++++ mm/kasan/report.c | 17 ++++++++++++++++- 2 files changed, 22 insertions(+), 1 deletion(-) diff --git a/include/linux/kasan.h b/include/linux/kasan.h index 1011e4f30284..6d8f3227c264 100644 --- a/include/linux/kasan.h +++ b/include/linux/kasan.h @@ -367,6 +367,12 @@ static inline void *kasan_reset_tag(const void *addr) #endif /* CONFIG_KASAN_SW_TAGS || CONFIG_KASAN_HW_TAGS*/ +#ifdef CONFIG_KASAN_HW_TAGS + +void kasan_report_async(void); + +#endif /* CONFIG_KASAN_HW_TAGS */ + #ifdef CONFIG_KASAN_SW_TAGS void __init kasan_init_sw_tags(void); #else diff --git a/mm/kasan/report.c b/mm/kasan/report.c index 87b271206163..f147633f1f2b 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_flag_async) + 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) { -- 2.30.0