From a64ce821c08f3adce52406a978e6a8ed0c108e7c Mon Sep 17 00:00:00 2001 From: Andrey Konovalov Date: Thu, 24 Mar 2022 18:12:11 -0700 Subject: [PATCH] UPSTREAM: 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 Bug: 254721825 (cherry picked from commit c056a364e9546bd513d1f5205f0ee316d8acb910) Change-Id: I241a02aa0968cb32d77db041ae9b41a3d18ebc77 Signed-off-by: Andrey Konovalov --- 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 2f5122ac5514..f2fa88ea1c8a 100644 --- a/mm/kasan/report.c +++ b/mm/kasan/report.c @@ -251,8 +251,21 @@ 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"); }