linux-kernel - [PATCH] kasan: distinguish kasan report from generic BUG()

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Date:   Wed, 24 Nov 2021 18:41:49 +0100 (CET)
From:   Jiri Kosina <jikos@...nel.org>
To:     Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Alexander Potapenko <glider@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>
cc:     kasan-dev@...glegroups.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, jslaby@...e.cz
Subject: [PATCH] kasan: distinguish kasan report from generic BUG()

From: Jiri Kosina <jkosina@...e.cz>

The typical KASAN report always begins with

	BUG: KASAN: ....

in kernel log. That 'BUG:' prefix creates a false impression that it's an 
actual BUG() codepath being executed, and as such things like 
'panic_on_oops' etc. would work on it as expected; but that's obviously 
not the case.

Switch the order of prefixes to make this distinction clear and avoid 
confusion.

Signed-off-by: Jiri Kosina <jkosina@...e.cz>
---
 mm/kasan/report.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/mm/kasan/report.c b/mm/kasan/report.c
index 0bc10f452f7e..ead714c844e9 100644
--- a/mm/kasan/report.c
+++ b/mm/kasan/report.c
@@ -86,7 +86,7 @@ __setup("kasan_multi_shot", kasan_set_multi_shot);
 
 static void print_error_description(struct kasan_access_info *info)
 {
-	pr_err("BUG: KASAN: %s in %pS\n",
+	pr_err("KASAN: BUG: %s in %pS\n",
 		kasan_get_bug_type(info), (void *)info->ip);
 	if (info->access_size)
 		pr_err("%s of size %zu at addr %px by task %s/%d\n",
@@ -366,7 +366,7 @@ void kasan_report_invalid_free(void *object, unsigned long ip)
 #endif /* IS_ENABLED(CONFIG_KUNIT) */
 
 	start_report(&flags);
-	pr_err("BUG: KASAN: double-free or invalid-free in %pS\n", (void *)ip);
+	pr_err("KASAN: BUG: double-free or invalid-free in %pS\n", (void *)ip);
 	kasan_print_tags(tag, object);
 	pr_err("\n");
 	print_address_description(object, tag);
@@ -386,7 +386,7 @@ void kasan_report_async(void)
 #endif /* IS_ENABLED(CONFIG_KUNIT) */
 
 	start_report(&flags);
-	pr_err("BUG: KASAN: invalid-access\n");
+	pr_err("KASAN: BUG: invalid-access\n");
 	pr_err("Asynchronous mode enabled: no access details available\n");
 	pr_err("\n");
 	dump_stack_lvl(KERN_ERR);


-- 
Jiri Kosina
SUSE Labs