The patch titled
Subject: kfence: use error_report_end tracepoint
has been added to the -mm tree. Its filename is
kfence-use-error_report_end-tracepoint.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/kfence-use-error_report_end-tracepoint.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/kfence-use-error_report_end-tracepoint.patch
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Alexander Potapenko <glider@xxxxxxxxxx>
Subject: kfence: use error_report_end tracepoint
Make it possible to trace KFENCE 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/20210121131915.1331302-3-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: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/kfence/report.c | 2 ++
1 file changed, 2 insertions(+)
--- a/mm/kfence/report.c~kfence-use-error_report_end-tracepoint
+++ a/mm/kfence/report.c
@@ -14,6 +14,7 @@
#include <linux/seq_file.h>
#include <linux/stacktrace.h>
#include <linux/string.h>
+#include <trace/events/error_report.h>
#include <asm/kfence.h>
@@ -246,6 +247,7 @@ void kfence_report_error(unsigned long a
show_regs(regs);
else
dump_stack_print_info(KERN_ERR);
+ trace_error_report_end(ERROR_DETECTOR_KFENCE, address);
pr_err("==================================================================\n");
lockdep_on();
_
Patches currently in -mm which might be from glider@xxxxxxxxxx are
mm-add-kernel-electric-fence-infrastructure.patch
x86-kfence-enable-kfence-for-x86.patch
mm-kfence-insert-kfence-hooks-for-slab.patch
mm-kfence-insert-kfence-hooks-for-slub.patch
kfence-kasan-make-kfence-compatible-with-kasan.patch
tracing-add-error_report_end-trace-point.patch
kfence-use-error_report_end-tracepoint.patch
kasan-use-error_report_end-tracepoint.patch
