From c056a364e9546bd513d1f5205f0ee316d8acb910 Mon Sep 17 00:00:00 2001 From: Andrey Konovalov Date: Thu, 24 Mar 2022 18:12:11 -0700 Subject: [PATCH] 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 Cc: Mark Rutland Cc: Marco Elver Cc: Alexander Potapenko Cc: Dmitriy Vyukov Cc: Andrey Ryabinin Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/kasan/report.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/mm/kasan/report.c b/mm/kasan/report.c index 137c2c0b09db..f64352008bb8 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"); }