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 X-Spam-Level: X-Spam-Status: No, score=-5.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 178B6C43331 for ; Sat, 9 Nov 2019 09:36:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DBAA321882 for ; Sat, 9 Nov 2019 09:36:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726320AbfKIJeK (ORCPT ); Sat, 9 Nov 2019 04:34:10 -0500 Received: from mail-io1-f71.google.com ([209.85.166.71]:46667 "EHLO mail-io1-f71.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id 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X-Received: by 2002:a6b:ee1a:: with SMTP id i26mr902733ioh.202.1573292048755; Sat, 09 Nov 2019 01:34:08 -0800 (PST) Date: Sat, 09 Nov 2019 01:34:08 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000b1b3090596e699ca@google.com> Subject: KMSAN: uninit-value in __copy_skb_header (3) From: syzbot To: ap420073@gmail.com, davem@davemloft.net, glider@google.com, herbert@gondor.apana.org.au, jakub.kicinski@netronome.com, linux-kernel@vger.kernel.org, lirongqing@baidu.com, netdev@vger.kernel.org, penguin-kernel@I-love.SAKURA.ne.jp, ptalbert@redhat.com, syzkaller-bugs@googlegroups.com, tglx@linutronix.de Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 6f88939b kmsan: don't unpoison memory in do_read_cache_pag.. git tree: https://github.com/google/kmsan.git master console output: https://syzkaller.appspot.com/x/log.txt?x=16f17da2e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=9e324dfe9c7b0360 dashboard link: https://syzkaller.appspot.com/bug?extid=47c1f21c8f16b76ba687 compiler: clang version 9.0.0 (/home/glider/llvm/clang 80fee25776c2fb61e74c1ecb1a523375c2500b69) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1417c17ce00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17e09b84e00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+47c1f21c8f16b76ba687@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in __skb_dst_copy include/net/dst.h:279 [inline] BUG: KMSAN: uninit-value in skb_dst_copy include/net/dst.h:285 [inline] BUG: KMSAN: uninit-value in __copy_skb_header+0x2bf/0x720 net/core/skbuff.c:935 CPU: 0 PID: 11989 Comm: syz-executor450 Not tainted 5.4.0-rc5+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x191/0x1f0 lib/dump_stack.c:113 kmsan_report+0x128/0x220 mm/kmsan/kmsan_report.c:108 __msan_warning+0x73/0xe0 mm/kmsan/kmsan_instr.c:245 __skb_dst_copy include/net/dst.h:279 [inline] skb_dst_copy include/net/dst.h:285 [inline] __copy_skb_header+0x2bf/0x720 net/core/skbuff.c:935 __skb_clone+0xa2/0x970 net/core/skbuff.c:987 skb_clone+0x402/0x5d0 net/core/skbuff.c:1455 do_one_broadcast net/netlink/af_netlink.c:1435 [inline] netlink_broadcast_filtered+0xbec/0x1c10 net/netlink/af_netlink.c:1510 netlink_broadcast+0xf6/0x110 net/netlink/af_netlink.c:1534 uevent_net_broadcast_untagged lib/kobject_uevent.c:330 [inline] kobject_uevent_net_broadcast lib/kobject_uevent.c:408 [inline] kobject_uevent_env+0x1c4e/0x27c0 lib/kobject_uevent.c:592 kobject_uevent+0x6f/0x80 lib/kobject_uevent.c:641 device_add+0x25a3/0x2df0 drivers/base/core.c:2201 hci_register_dev+0x61a/0xfd0 net/bluetooth/hci_core.c:3308 hci_uart_register_dev drivers/bluetooth/hci_ldisc.c:682 [inline] hci_uart_set_proto drivers/bluetooth/hci_ldisc.c:706 [inline] hci_uart_tty_ioctl+0xe61/0x1140 drivers/bluetooth/hci_ldisc.c:760 tty_ioctl+0x23e2/0x3100 drivers/tty/tty_io.c:2666 do_vfs_ioctl+0xea8/0x2c50 fs/ioctl.c:46 ksys_ioctl fs/ioctl.c:713 [inline] __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl+0x1da/0x270 fs/ioctl.c:718 __x64_sys_ioctl+0x4a/0x70 fs/ioctl.c:718 do_syscall_64+0xb6/0x160 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x4412f9 Code: e8 fc ab 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 0f 83 9b 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffd6393cca8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004412f9 RDX: 0000000000000001 RSI: 00000000400455c8 RDI: 0000000000000003 RBP: 000000000001cbad R08: 00000009004002c8 R09: 00000009004002c8 R10: 00000009004002c8 R11: 0000000000000246 R12: 0000000000402120 R13: 00000000004021b0 R14: 0000000000000000 R15: 0000000000000000 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:151 [inline] kmsan_internal_poison_shadow+0x60/0x120 mm/kmsan/kmsan.c:134 kmsan_slab_alloc+0xaa/0x120 mm/kmsan/kmsan_hooks.c:88 slab_alloc_node mm/slub.c:2799 [inline] slab_alloc mm/slub.c:2808 [inline] kmem_cache_alloc+0x8d9/0xd20 mm/slub.c:2813 skb_clone+0x326/0x5d0 net/core/skbuff.c:1448 do_one_broadcast net/netlink/af_netlink.c:1435 [inline] netlink_broadcast_filtered+0xbec/0x1c10 net/netlink/af_netlink.c:1510 netlink_broadcast+0xf6/0x110 net/netlink/af_netlink.c:1534 uevent_net_broadcast_untagged lib/kobject_uevent.c:330 [inline] kobject_uevent_net_broadcast lib/kobject_uevent.c:408 [inline] kobject_uevent_env+0x1c4e/0x27c0 lib/kobject_uevent.c:592 kobject_uevent+0x6f/0x80 lib/kobject_uevent.c:641 device_add+0x25a3/0x2df0 drivers/base/core.c:2201 hci_register_dev+0x61a/0xfd0 net/bluetooth/hci_core.c:3308 hci_uart_register_dev drivers/bluetooth/hci_ldisc.c:682 [inline] hci_uart_set_proto drivers/bluetooth/hci_ldisc.c:706 [inline] hci_uart_tty_ioctl+0xe61/0x1140 drivers/bluetooth/hci_ldisc.c:760 tty_ioctl+0x23e2/0x3100 drivers/tty/tty_io.c:2666 do_vfs_ioctl+0xea8/0x2c50 fs/ioctl.c:46 ksys_ioctl fs/ioctl.c:713 [inline] __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl+0x1da/0x270 fs/ioctl.c:718 __x64_sys_ioctl+0x4a/0x70 fs/ioctl.c:718 do_syscall_64+0xb6/0x160 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 ===================================================== --- This bug 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 bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches