From: Alexander Potapenko <glider@xxxxxxxxxx> Subject: kasan: use error_report_end tracepoint 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. Link: https://lkml.kernel.org/r/20210121131915.1331302-4-glider@xxxxxxxxxx Signed-off-by: Alexander Potapenko <glider@xxxxxxxxxx> Suggested-by: Marco Elver <elver@xxxxxxxxxx> Cc: Andrey Konovalov <andreyknvl@xxxxxxxxxx> Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx> Cc: Ingo Molnar <mingo@xxxxxxxxxx> Cc: Petr Mladek <pmladek@xxxxxxxx> Cc: Steven Rostedt <rostedt@xxxxxxxxxxx> Cc: Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Cc: Vlastimil Babka <vbabka@xxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/kasan/report.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) --- a/mm/kasan/report.c~kasan-use-error_report_end-tracepoint +++ a/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 * 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 *obj 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 dump_stack(); } - end_report(&flags); + end_report(&flags, addr); } bool kasan_report(unsigned long addr, size_t size, bool is_write, _
