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authorAlexander Potapenko <glider@google.com>2021-02-25 17:19:51 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2021-02-26 09:41:02 -0800
commitd3a61f745e0d089a2484740283a434deb6dd4eb5 (patch)
tree106096c28808a2a7f61862dbbeca69ba450dbbdb /mm
parentf2b84d2e40eb1a17f72dc4a1da463ec8de649f19 (diff)
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@google.com Signed-off-by: Alexander Potapenko <glider@google.com> Suggested-by: Marco Elver <elver@google.com> Cc: Andrey Konovalov <andreyknvl@google.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Petr Mladek <pmladek@suse.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/kasan/report.c8
1 files 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,