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kasan: Add report for async mode

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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>
This commit is contained in:
Vincenzo Frascino 2021-03-15 13:20:14 +00:00 committed by Catalin Marinas
parent c137c6145b
commit 8f7b505475
3 changed files with 38 additions and 1 deletions
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6
include/linux/kasan.h
View File

@ -376,6 +376,12 @@ 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

16
mm/kasan/kasan.h
View File

@ -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;

17
mm/kasan/report.c
View File

@ -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)
{