linux-kernel - [PATCH mm 02/22] kasan: more line breaks in reports

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Message-Id: <8682c4558e533cd0f99bdb964ce2fe741f2a9212.1646237226.git.andreyknvl@google.com>
Date:   Wed,  2 Mar 2022 17:36:22 +0100
From:   andrey.konovalov@...ux.dev
To:     Marco Elver <elver@...gle.com>,
        Alexander Potapenko <glider@...gle.com>
Cc:     Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        kasan-dev@...glegroups.com,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: [PATCH mm 02/22] kasan: more line breaks in reports

From: Andrey Konovalov <andreyknvl@...gle.com>

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

Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
---
 mm/kasan/report.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/mm/kasan/report.c b/mm/kasan/report.c
index 607a8c2e4674..ded648c0a0e4 100644
--- 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);
-- 
2.25.1