From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 52D5EC3DA7A for ; Thu, 5 Jan 2023 16:43:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233851AbjAEQni (ORCPT ); Thu, 5 Jan 2023 11:43:38 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38806 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229842AbjAEQng (ORCPT ); Thu, 5 Jan 2023 11:43:36 -0500 Received: from mail-io1-f69.google.com (mail-io1-f69.google.com [209.85.166.69]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 52F8544C41 for ; Thu, 5 Jan 2023 08:43:35 -0800 (PST) Received: by mail-io1-f69.google.com with SMTP id z9-20020a6be009000000b006e0577c3686so10981520iog.0 for ; Thu, 05 Jan 2023 08:43:35 -0800 (PST) X-Google-DKIM-Signature: v=1; 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charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: c76083fac3ba Add linux-next specific files for 20221226 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=104afeb2480000 kernel config: https://syzkaller.appspot.com/x/.config?x=c217c755f1884ab6 dashboard link: https://syzkaller.appspot.com/bug?extid=b1b66db80fe98b733c58 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=136ca714480000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16fcd5da480000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/e388f26357fd/disk-c76083fa.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/e24f0bae36d5/vmlinux-c76083fa.xz kernel image: https://storage.googleapis.com/syzbot-assets/a5a69a059716/bzImage-c76083fa.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/bb457662f7c3/mount_0.gz The issue was bisected to: commit 869e9be21b1c67010d215c83c38b32f6cbd080cc Author: Jan Kara Date: Tue Dec 20 11:38:45 2022 +0000 udf: Allocate name buffer in directory iterator on heap bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=15ce5eb2480000 final oops: https://syzkaller.appspot.com/x/report.txt?x=17ce5eb2480000 console output: https://syzkaller.appspot.com/x/log.txt?x=13ce5eb2480000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+b1b66db80fe98b733c58@syzkaller.appspotmail.com Fixes: 869e9be21b1c ("udf: Allocate name buffer in directory iterator on heap") RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fcd6a74ea39 RDX: 0000000000000000 RSI: 0000000000141043 RDI: 00000000200000c0 RBP: 00007ffc262fb620 R08: 0000000000000002 R09: 00007ffc262fb630 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 R13: 00007ffc262fb660 R14: 00007ffc262fb640 R15: 0000000000000008 ================================================================== BUG: KASAN: null-ptr-deref in udf_fiiter_add_entry+0x75b/0x10d0 fs/udf/namei.c:316 Write of size 4 at addr 0000000000000000 by task syz-executor153/5085 CPU: 0 PID: 5085 Comm: syz-executor153 Not tainted 6.2.0-rc1-next-20221226-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106 kasan_report+0xc0/0xf0 mm/kasan/report.c:517 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0x141/0x190 mm/kasan/generic.c:189 memcpy+0x3d/0x60 mm/kasan/shadow.c:66 udf_fiiter_add_entry+0x75b/0x10d0 fs/udf/namei.c:316 udf_add_nondir+0xda/0x360 fs/udf/namei.c:349 udf_create+0x12c/0x180 fs/udf/namei.c:384 lookup_open.isra.0+0xee7/0x1270 fs/namei.c:3413 open_last_lookups fs/namei.c:3481 [inline] path_openat+0x975/0x2a50 fs/namei.c:3711 do_filp_open+0x1ba/0x410 fs/namei.c:3741 do_sys_openat2+0x16d/0x4c0 fs/open.c:1310 do_sys_open fs/open.c:1326 [inline] __do_sys_open fs/open.c:1334 [inline] __se_sys_open fs/open.c:1330 [inline] __x64_sys_open+0x11d/0x1c0 fs/open.c:1330 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fcd6a74ea39 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffc262fb5f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fcd6a74ea39 RDX: 0000000000000000 RSI: 0000000000141043 RDI: 00000000200000c0 RBP: 00007ffc262fb620 R08: 0000000000000002 R09: 00007ffc262fb630 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 R13: 00007ffc262fb660 R14: 00007ffc262fb640 R15: 0000000000000008 ================================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches