kasan: move update_kunit_status to start_report

Instead of duplicating calls to update_kunit_status() in every error
report routine, call it once in start_report().  Pass the sync flag as an
additional argument to start_report().

Link: https://lkml.kernel.org/r/cae5c845a0b6f3c867014e53737cdac56b11edc7.1646237226.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Marco Elver <elver@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/kasan/report.c b/mm/kasan/report.c
index 9354315..0b6c8a1 100644 (file)
--- a/mm/kasan/report.c
+++ b/mm/kasan/report.c
@@ -98,13 +98,40 @@ static void print_error_description(struct kasan_access_info *info)
                        info->access_addr, current->comm, task_pid_nr(current));
 }
 
+#if IS_ENABLED(CONFIG_KASAN_KUNIT_TEST)
+static void update_kunit_status(bool sync)
+{
+       struct kunit *test;
+       struct kunit_resource *resource;
+       struct kunit_kasan_status *status;
+
+       test = current->kunit_test;
+       if (!test)
+               return;
+
+       resource = kunit_find_named_resource(test, "kasan_status");
+       if (!resource) {
+               kunit_set_failure(test);
+               return;
+       }
+
+       status = (struct kunit_kasan_status *)resource->data;
+       WRITE_ONCE(status->report_found, true);
+       WRITE_ONCE(status->sync_fault, sync);
+
+       kunit_put_resource(resource);
+}
+#else
+static void update_kunit_status(bool sync) { }
+#endif
+
 static DEFINE_SPINLOCK(report_lock);
 
-static void start_report(unsigned long *flags)
+static void start_report(unsigned long *flags, bool sync)
 {
-       /*
-        * Make sure we don't end up in loop.
-        */
+       /* Update status of the currently running KASAN test. */
+       update_kunit_status(sync);
+       /* Make sure we don't end up in loop. */
        kasan_disable_current();
        spin_lock_irqsave(&report_lock, *flags);
        pr_err("==================================================================\n");
@@ -356,33 +383,6 @@ static bool report_enabled(void)
        return !test_and_set_bit(KASAN_BIT_REPORTED, &kasan_flags);
 }
 
-#if IS_ENABLED(CONFIG_KASAN_KUNIT_TEST)
-static void update_kunit_status(bool sync)
-{
-       struct kunit *test;
-       struct kunit_resource *resource;
-       struct kunit_kasan_status *status;
-
-       test = current->kunit_test;
-       if (!test)
-               return;
-
-       resource = kunit_find_named_resource(test, "kasan_status");
-       if (!resource) {
-               kunit_set_failure(test);
-               return;
-       }
-
-       status = (struct kunit_kasan_status *)resource->data;
-       WRITE_ONCE(status->report_found, true);
-       WRITE_ONCE(status->sync_fault, sync);
-
-       kunit_put_resource(resource);
-}
-#else
-static void update_kunit_status(bool sync) { }
-#endif
-
 void kasan_report_invalid_free(void *object, unsigned long ip)
 {
        unsigned long flags;
@@ -390,9 +390,7 @@ void kasan_report_invalid_free(void *object, unsigned long ip)
 
        object = kasan_reset_tag(object);
 
-       update_kunit_status(true);
-
-       start_report(&flags);
+       start_report(&flags, true);
        pr_err("BUG: KASAN: double-free or invalid-free in %pS\n", (void *)ip);
        kasan_print_tags(tag, object);
        pr_err("\n");
@@ -406,9 +404,7 @@ void kasan_report_async(void)
 {
        unsigned long flags;
 
-       update_kunit_status(false);
-
-       start_report(&flags);
+       start_report(&flags, false);
        pr_err("BUG: KASAN: invalid-access\n");
        pr_err("Asynchronous mode enabled: no access details available\n");
        pr_err("\n");
@@ -425,9 +421,8 @@ static void __kasan_report(unsigned long addr, size_t size, bool is_write,
        void *untagged_addr;
        unsigned long flags;
 
-       update_kunit_status(true);
-
        disable_trace_on_warning();
+       start_report(&flags, true);
 
        tagged_addr = (void *)addr;
        untagged_addr = kasan_reset_tag(tagged_addr);
@@ -442,8 +437,6 @@ static void __kasan_report(unsigned long addr, size_t size, bool is_write,
        info.is_write = is_write;
        info.ip = ip;
 
-       start_report(&flags);
-
        print_error_description(&info);
        if (addr_has_metadata(untagged_addr))
                kasan_print_tags(get_tag(tagged_addr), info.first_bad_addr);