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Subject[PATCH v2 2/2] kunit: ubsan integration
From: Uriel Guajardo <>

Integrates UBSAN into the KUnit testing framework. It fails KUnit tests
whenever it reports undefined behavior.

When CONFIG_KUNIT=n, nothing is printed or even formatted, so this has
no behavioral impact outside of tests.

kunit_fail_current_test() effectively does a pr_err() as well, so
there's some slight duplication, but it also ensures an error is
recorded in the debugfs entry for the running KUnit test.

Print a shorter version of the message to make it less spammy.

Co-developed-by: Daniel Latypov <>
Signed-off-by: Uriel Guajardo <>
Signed-off-by: Daniel Latypov <>
lib/ubsan.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/lib/ubsan.c b/lib/ubsan.c
index bec38c64d6a6..1ec7d6f1fe63 100644
--- a/lib/ubsan.c
+++ b/lib/ubsan.c
@@ -14,6 +14,7 @@
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/uaccess.h>
+#include <kunit/test-bug.h>

#include "ubsan.h"

@@ -141,6 +142,8 @@ static void ubsan_prologue(struct source_location *loc, const char *reason)
pr_err("UBSAN: %s in %s:%d:%d\n", reason, loc->file_name,
loc->line & LINE_MASK, loc->column & COLUMN_MASK);
+ kunit_fail_current_test("%s in %s", reason, loc->file_name);

static void ubsan_epilogue(void)
 \ /
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