kasan: more line breaks in reports

Add a line break after each part that describes the buggy address.
Improves readability of reports.

Link: https://lkml.kernel.org/r/8682c4558e533cd0f99bdb964ce2fe741f2a9212.1646237226.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Reviewed-by: 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 607a8c2..ded648c 100644 (file)
--- a/mm/kasan/report.c
+++ b/mm/kasan/report.c
@@ -250,11 +250,13 @@ static void print_address_description(void *addr, u8 tag)
                void *object = nearest_obj(cache, slab, addr);
 
                describe_object(cache, object, addr, tag);
+               pr_err("\n");
        }
 
        if (kernel_or_module_addr(addr) && !init_task_stack_addr(addr)) {
                pr_err("The buggy address belongs to the variable:\n");
                pr_err(" %pS\n", addr);
+               pr_err("\n");
        }
 
        if (is_vmalloc_addr(addr)) {
@@ -265,6 +267,7 @@ static void print_address_description(void *addr, u8 tag)
                               " [%px, %px) created by:\n"
                               " %pS\n",
                               va->addr, va->addr + va->size, va->caller);
+                       pr_err("\n");
 
                        page = vmalloc_to_page(page);
                }
@@ -273,9 +276,11 @@ static void print_address_description(void *addr, u8 tag)
        if (page) {
                pr_err("The buggy address belongs to the physical page:\n");
                dump_page(page, "kasan: bad access detected");
+               pr_err("\n");
        }
 
        kasan_print_address_stack_frame(addr);
+       pr_err("\n");
 }
 
 static bool meta_row_is_guilty(const void *row, const void *addr)
@@ -382,7 +387,6 @@ void kasan_report_invalid_free(void *object, unsigned long ip)
        kasan_print_tags(tag, object);
        pr_err("\n");
        print_address_description(object, tag);
-       pr_err("\n");
        print_memory_metadata(object);
        end_report(&flags, (unsigned long)object);
 }
@@ -443,7 +447,6 @@ static void __kasan_report(unsigned long addr, size_t size, bool is_write,
 
        if (addr_has_metadata(untagged_addr)) {
                print_address_description(untagged_addr, get_tag(tagged_addr));
-               pr_err("\n");
                print_memory_metadata(info.first_bad_addr);
        } else {
                dump_stack_lvl(KERN_ERR);