linux-kernel - [PATCH mm 04/22] kasan: improve stack frame info in reports

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Message-Id: <aa613f097c12f7b75efb17f2618ae00480fb4bc3.1646237226.git.andreyknvl@google.com>
Date:   Wed,  2 Mar 2022 17:36:24 +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 04/22] kasan: improve stack frame info in reports

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

- Print at least task name and id for reports affecting allocas
  (get_address_stack_frame_info() does not support them).

- Capitalize first letter of each sentence.

Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
---
 mm/kasan/report_generic.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/mm/kasan/report_generic.c b/mm/kasan/report_generic.c
index 3751391ff11a..7e03cca569a7 100644
--- a/mm/kasan/report_generic.c
+++ b/mm/kasan/report_generic.c
@@ -180,7 +180,7 @@ static void print_decoded_frame_descr(const char *frame_descr)
 		return;
 
 	pr_err("\n");
-	pr_err("this frame has %lu %s:\n", num_objects,
+	pr_err("This frame has %lu %s:\n", num_objects,
 	       num_objects == 1 ? "object" : "objects");
 
 	while (num_objects--) {
@@ -266,13 +266,14 @@ void kasan_print_address_stack_frame(const void *addr)
 	if (WARN_ON(!object_is_on_stack(addr)))
 		return;
 
+	pr_err("The buggy address belongs to stack of task %s/%d\n",
+	       current->comm, task_pid_nr(current));
+
 	if (!get_address_stack_frame_info(addr, &offset, &frame_descr,
 					  &frame_pc))
 		return;
 
-	pr_err("\n");
-	pr_err("addr %px is located in stack of task %s/%d at offset %lu in frame:\n",
-	       addr, current->comm, task_pid_nr(current), offset);
+	pr_err(" and is located at offset %lu in frame:\n", offset);
 	pr_err(" %pS\n", frame_pc);
 
 	if (!frame_descr)
-- 
2.25.1