linux-kernel - [PATCH v4 2/2] kunit: ubsan integration

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Message-Id: <20210311152314.3814916-3-dlatypov@google.com>
Date:   Thu, 11 Mar 2021 07:23:14 -0800
From:   Daniel Latypov <dlatypov@...gle.com>
To:     brendanhiggins@...gle.com
Cc:     davidgow@...gle.com, alan.maguire@...cle.com,
        linux-kernel@...r.kernel.org, kunit-dev@...glegroups.com,
        linux-kselftest@...r.kernel.org, skhan@...uxfoundation.org,
        Uriel Guajardo <urielguajardo@...gle.com>,
        Daniel Latypov <dlatypov@...gle.com>
Subject: [PATCH v4 2/2] kunit: ubsan integration

From: Uriel Guajardo <urielguajardo@...gle.com>

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 <dlatypov@...gle.com>
Signed-off-by: Daniel Latypov <dlatypov@...gle.com>
Signed-off-by: Uriel Guajardo <urielguajardo@...gle.com>
Reviewed-by: Alan Maguire <alan.maguire@...cle.com>
---
 lib/ubsan.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/ubsan.c b/lib/ubsan.c
index 26229973049d..bdc380ff5d5c 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)
 		"========================================\n");
 	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)
-- 
2.31.0.rc2.261.g7f71774620-goog