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=-0.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED 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 38521C46469 for ; Wed, 12 Sep 2018 10:24:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E7C6020866 for ; Wed, 12 Sep 2018 10:24:05 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E7C6020866 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727746AbeILP14 (ORCPT ); Wed, 12 Sep 2018 11:27:56 -0400 Received: from mail-io0-f200.google.com ([209.85.223.200]:49765 "EHLO mail-io0-f200.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726782AbeILP14 (ORCPT ); Wed, 12 Sep 2018 11:27:56 -0400 Received: by mail-io0-f200.google.com with SMTP id k9-v6so1304309iob.16 for ; Wed, 12 Sep 2018 03:24:03 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:message-id:subject:from:to; bh=5d6b41EEhWzHCgy1NQANctfz8TQS9WVztPuDbOPPY90=; b=aHG/aYStDIL05DUXDVwbq0xlIPs5ZAQ3yjVCHvDYzZUKWnE2L8tikiHQqD0Q5HweX3 d1hN3XJErG7fZbrinMISlz/D26CKmyH/i6PlXktmjFYV+aSljERPc4AeWbpb8hGqUKOS op2ASp7qXS3X62VE3rTHQj983kET40/LS3XmQyhCXT7RFOPGZBlT+b7xUNLJWQSh9bjU Rw9/eJmgS9rAAWjoW8t2yEzm4y1S224yac0885Omo50z3pYznZprxW2bpuvV3ohRhVfV tfbhWuET7uhfm7JlczRUjo0NFgu7O6LxUIp4njcKfhOSDjToLG/wisj/apZd2WpacPb6 ue2A== X-Gm-Message-State: APzg51CYuRGK1i5Kv94nDfdVX6AK4EUjPp6zZDJcV3CH0X8FZdV2SATp JIZo4SYP1bx2iycPWvCnLVcjYRqFHdwtK+2Wuya3Jt0Hafbd X-Google-Smtp-Source: ANB0VdZODwZtxeg+9hMHpvDxeyBrMbKS3POwWOqp/IoLqp6znbB7tuBbhJtseVlsD5FcWMr0jkOAJgUVdxfeI8+J9/kC8JoI0Fcx MIME-Version: 1.0 X-Received: by 2002:a6b:3c17:: with SMTP id k23-v6mr704112iob.81.1536747842705; Wed, 12 Sep 2018 03:24:02 -0700 (PDT) Date: Wed, 12 Sep 2018 03:24:02 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000004624c30575a9fd40@google.com> Subject: KMSAN: uninit-value in pppoe_rcv From: syzbot To: linux-kernel@vger.kernel.org, mostrows@earthlink.net, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com 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: d2d741e5d189 kmsan: add initialization for shmem pages git tree: https://github.com/google/kmsan.git/master console output: https://syzkaller.appspot.com/x/log.txt?x=1465fc37800000 kernel config: https://syzkaller.appspot.com/x/.config?x=48f9de3384bcd0f dashboard link: https://syzkaller.appspot.com/bug?extid=f5f6080811c849739212 compiler: clang version 7.0.0 (trunk 329391) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14d6e607800000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10a15b5b800000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+f5f6080811c849739212@syzkaller.appspotmail.com IPVS: ftp: loaded support on port[0] = 21 ================================================================== BUG: KMSAN: uninit-value in __get_item drivers/net/ppp/pppoe.c:172 [inline] BUG: KMSAN: uninit-value in get_item drivers/net/ppp/pppoe.c:236 [inline] BUG: KMSAN: uninit-value in pppoe_rcv+0xcef/0x10e0 drivers/net/ppp/pppoe.c:450 CPU: 0 PID: 4543 Comm: syz-executor355 Not tainted 4.16.0+ #87 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x185/0x1d0 lib/dump_stack.c:53 kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067 __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:683 __get_item drivers/net/ppp/pppoe.c:172 [inline] get_item drivers/net/ppp/pppoe.c:236 [inline] pppoe_rcv+0xcef/0x10e0 drivers/net/ppp/pppoe.c:450 __netif_receive_skb_core+0x47df/0x4a90 net/core/dev.c:4562 __netif_receive_skb net/core/dev.c:4627 [inline] netif_receive_skb_internal+0x49d/0x630 net/core/dev.c:4701 netif_receive_skb+0x230/0x240 net/core/dev.c:4725 tun_rx_batched drivers/net/tun.c:1555 [inline] tun_get_user+0x740f/0x7c60 drivers/net/tun.c:1962 tun_chr_write_iter+0x1d4/0x330 drivers/net/tun.c:1990 call_write_iter include/linux/fs.h:1782 [inline] new_sync_write fs/read_write.c:469 [inline] __vfs_write+0x7fb/0x9f0 fs/read_write.c:482 vfs_write+0x463/0x8d0 fs/read_write.c:544 SYSC_write+0x172/0x360 fs/read_write.c:589 SyS_write+0x55/0x80 fs/read_write.c:581 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x3d/0xa2 RIP: 0033:0x4447c9 RSP: 002b:00007fff64c8fc28 EFLAGS: 00000297 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004447c9 RDX: 000000000000fd87 RSI: 0000000020000600 RDI: 0000000000000004 RBP: 00000000006cf018 R08: 00007fff64c8fda8 R09: 00007fff00006bda R10: 0000000000005fe7 R11: 0000000000000297 R12: 00000000004020d0 R13: 0000000000402160 R14: 0000000000000000 R15: 0000000000000000 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:278 [inline] kmsan_internal_poison_shadow+0xb8/0x1b0 mm/kmsan/kmsan.c:188 kmsan_kmalloc+0x94/0x100 mm/kmsan/kmsan.c:314 kmsan_slab_alloc+0x11/0x20 mm/kmsan/kmsan.c:321 slab_post_alloc_hook mm/slab.h:445 [inline] slab_alloc_node mm/slub.c:2737 [inline] __kmalloc_node_track_caller+0xaed/0x11c0 mm/slub.c:4369 __kmalloc_reserve net/core/skbuff.c:138 [inline] __alloc_skb+0x2cf/0x9f0 net/core/skbuff.c:206 alloc_skb include/linux/skbuff.h:984 [inline] alloc_skb_with_frags+0x1d4/0xb20 net/core/skbuff.c:5234 sock_alloc_send_pskb+0xb56/0x1190 net/core/sock.c:2085 tun_alloc_skb drivers/net/tun.c:1532 [inline] tun_get_user+0x2242/0x7c60 drivers/net/tun.c:1829 tun_chr_write_iter+0x1d4/0x330 drivers/net/tun.c:1990 call_write_iter include/linux/fs.h:1782 [inline] new_sync_write fs/read_write.c:469 [inline] __vfs_write+0x7fb/0x9f0 fs/read_write.c:482 vfs_write+0x463/0x8d0 fs/read_write.c:544 SYSC_write+0x172/0x360 fs/read_write.c:589 SyS_write+0x55/0x80 fs/read_write.c:581 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x3d/0xa2 ================================================================== --- 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#bug-status-tracking for how to communicate with syzbot. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches