Commit c056a364 authored by Andrey Konovalov's avatar Andrey Konovalov Committed by Linus Torvalds
Browse files

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: default avatarAndrey 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 2dfd1bd9

mm/kasan/report.c

+14 −1
Original line number Diff line number Diff line
@@ -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");

	}