linux-kernel - [PATCH v2 4/5] kfence: use error_report_start and error_report

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Message-Id: <20210115130336.2520663-5-glider@google.com>
Date:   Fri, 15 Jan 2021 14:03:35 +0100
From:   Alexander Potapenko <glider@...gle.com>
To:     linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Cc:     andreyknvl@...gle.com, dvyukov@...gle.com, mingo@...hat.com,
        elver@...gle.com, pmladek@...e.com, rostedt@...dmis.org,
        sergey.senozhatsky@...il.com, glider@...gle.com, linux-mm@...ck.org
Subject: [PATCH v2 4/5] kfence: use error_report_start and error_report_end tracepoints

Make it possible to trace KFENCE error reporting (in particular, for
compatibility with CONFIG_ERROR_REPORT_NOTIFY).

Suggested-by: Marco Elver <elver@...gle.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Andrey Konovalov <andreyknvl@...gle.com>
Cc: Dmitry Vyukov <dvyukov@...gle.com>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Marco Elver <elver@...gle.com>
Cc: Petr Mladek <pmladek@...e.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Cc: linux-mm@...ck.org
Signed-off-by: Alexander Potapenko <glider@...gle.com>

---
v2:
 - change error_report_start and error_report_end prototypes
   to accept enum error_detector instead of char*
   (as suggested by Steven Rostedt)
---
 mm/kfence/report.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mm/kfence/report.c b/mm/kfence/report.c
index 4dedc2ff8f28..bbe7dad5f249 100644
--- a/mm/kfence/report.c
+++ b/mm/kfence/report.c
@@ -9,6 +9,7 @@
 #include <linux/seq_file.h>
 #include <linux/stacktrace.h>
 #include <linux/string.h>
+#include <trace/events/error_report.h>
 
 #include <asm/kfence.h>
 
@@ -184,6 +185,7 @@ void kfence_report_error(unsigned long address, struct pt_regs *regs,
 	lockdep_off();
 
 	pr_err("==================================================================\n");
+	trace_error_report_start(ERROR_DETECTOR_KFENCE, address);
 	/* Print report header. */
 	switch (type) {
 	case KFENCE_ERROR_OOB: {
@@ -232,6 +234,7 @@ void kfence_report_error(unsigned long address, struct pt_regs *regs,
 		show_regs(regs);
 	else
 		dump_stack_print_info(KERN_ERR);
+	trace_error_report_end(ERROR_DETECTOR_KFENCE, address);
 	pr_err("==================================================================\n");
 
 	lockdep_on();
-- 
2.30.0.284.gd98b1dd5eaa7-goog