From: Andrey Konovalov <andreyknvl@google.com>
Date: Fri, 25 Mar 2022 01:12:11 +0000 (-0700)
Subject: kasan: print virtual mapping info in reports
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=c056a364e9546bd513d1f5205f0ee316d8acb910;p=linux.git

kasan: print virtual mapping info in reports

Print virtual mapping range and its creator in reports affecting virtual
mappings.

Also get physical page pointer for such mappings, so page information gets
printed as well.

Link: https://lkml.kernel.org/r/6ebb11210ae21253198e264d4bb0752c1fad67d7.1645548178.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Marco Elver <elver@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Dmitriy Vyukov <dvyukov@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.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 137c2c0b09db6..f64352008bb85 100644
--- a/mm/kasan/report.c
+++ b/mm/kasan/report.c
@@ -260,8 +260,21 @@ static void print_address_description(void *addr, u8 tag)
 		pr_err(" %pS\n", addr);
 	}
 
+	if (is_vmalloc_addr(addr)) {
+		struct vm_struct *va = find_vm_area(addr);
+
+		if (va) {
+			pr_err("The buggy address belongs to the virtual mapping at\n"
+			       " [%px, %px) created by:\n"
+			       " %pS\n",
+			       va->addr, va->addr + va->size, va->caller);
+
+			page = vmalloc_to_page(page);
+		}
+	}
+
 	if (page) {
-		pr_err("The buggy address belongs to the page:\n");
+		pr_err("The buggy address belongs to the physical page:\n");
 		dump_page(page, "kasan: bad access detected");
 	}