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

From: Jiri Kosina
Date: Wed Nov 24 2021 - 12:41:56 EST


From: Jiri Kosina <jkosina@xxxxxxx>

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@xxxxxxx>
---
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