Make it possible to trace KASAN error reporting. A good usecase is
watching for trace events from the userspace to detect and process
memory corruption reports from the kernel.
Suggested-by: Marco Elver <elver@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andrey Konovalov <redacted>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Marco Elver <elver@google.com>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Sergey Senozhatsky <redacted>
Cc: <redacted>
Signed-off-by: Alexander Potapenko <glider@google.com>
---
v3:
- dropped error_report_start
v2:
- change error_report_start and error_report_end prototypes
to accept enum error_detector instead of char*
(as suggested by Steven Rostedt)
---
mm/kasan/report.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/mm/kasan/report.c b/mm/kasan/report.c
index 234f35a84f19..87b271206163 100644
--- a/mm/kasan/report.c
+++ b/mm/kasan/report.c
@@ -25,6 +25,7 @@
#include <linux/module.h>
#include <linux/sched/task_stack.h>
#include <linux/uaccess.h>
+#include <trace/events/error_report.h>
#include <asm/sections.h>
@@ -84,8 +85,9 @@ static void start_report(unsigned long *flags)
pr_err("==================================================================\n");
}
-static void end_report(unsigned long *flags)
+static void end_report(unsigned long *flags, unsigned long addr)
{
+ 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);@@ -355,7 +357,7 @@ void kasan_report_invalid_free(void *object, unsigned long ip)
print_address_description(object, tag);
pr_err("\n");
print_memory_metadata(object);
- end_report(&flags);
+ end_report(&flags, (unsigned long)object);
}
static void __kasan_report(unsigned long addr, size_t size, bool is_write,@@ -401,7 +403,7 @@ static void __kasan_report(unsigned long addr, size_t size, bool is_write,
dump_stack();
}
- end_report(&flags);
+ end_report(&flags, addr);
}
bool kasan_report(unsigned long addr, size_t size, bool is_write,
--
2.30.0.296.g2bfb1c46d8-goog