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 4A13DC77B61 for ; Sat, 29 Apr 2023 03:11:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1347206AbjD2DLx (ORCPT ); Fri, 28 Apr 2023 23:11:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40468 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230121AbjD2DLv (ORCPT ); Fri, 28 Apr 2023 23:11:51 -0400 Received: from mail-io1-f80.google.com (mail-io1-f80.google.com [209.85.166.80]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 516581FD0 for ; Fri, 28 Apr 2023 20:11:49 -0700 (PDT) Received: by mail-io1-f80.google.com with SMTP id ca18e2360f4ac-7639ebbef32so70688139f.2 for ; Fri, 28 Apr 2023 20:11:49 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1682737908; x=1685329908; h=to:from:subject:message-id:in-reply-to:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=YD2i4IPlwbK4zPwgM4t3+h9xw/jbTfupJpZlr6kcoHs=; b=lwGU/y/k77HyXimfYpyDijL3wegG2fgG7DaNut1I7mNsw8pzPqVISPV87ExQABmywd OgMWtgVHtW+PsENmWf2IiPvd839nrswKdVlFId+vZXRkf2ygxl2NF/d2tUXHxf5YhVKL 8vJaMayEvJmzdwv1ES/UkjgTbBOsUNnl09joB4G9Q/Z37fsMJkIm9butg7uEZ6Sq6fVo c1tDWw9pUeiJ7c0P4ZFCjxQTjaHN0BesuIQeQVwI7CWeaY8MSyJ/u4tkxz8BOAzlSIDq 3qf2sK+Ml70pBLV87J/2N51spbMp1y8rgYsbaYopsdR7yBdPLGFvl6X5iBL1/SaHCsuh fTjQ== X-Gm-Message-State: AC+VfDwk9P8i/0so5k06ptI0wjwmZ/W4ogS67tWCYSpYqmldaTYfUmgt cYcrVzBVwLAKZu2vACtzMEZJZaxc/9/rXH/PtgZzksxeerk+ X-Google-Smtp-Source: ACHHUZ7QAUwhyObclYFAuRIVRAvxlvqji4eWGadx8L2GQtt9fl2o0Ki6oOm01GszjRYE56r2iKlNqIyLxubeJKapH4cr7I3MsY/2 MIME-Version: 1.0 X-Received: by 2002:a6b:d004:0:b0:762:f8d4:6fe with SMTP id x4-20020a6bd004000000b00762f8d406femr3817314ioa.3.1682737908657; Fri, 28 Apr 2023 20:11:48 -0700 (PDT) Date: Fri, 28 Apr 2023 20:11:48 -0700 In-Reply-To: <0000000000009ff60505e2fab2e6@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000004bb41105fa70f361@google.com> Subject: Re: [syzbot] [net?] KMSAN: uninit-value in ethnl_set_linkmodes (2) From: syzbot To: davem@davemloft.net, edumazet@google.com, glider@google.com, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org syzbot has found a reproducer for the following issue on: HEAD commit: 81af97bdef5e printk: Export console trace point for kcsan/.. git tree: https://github.com/google/kmsan.git master console+strace: https://syzkaller.appspot.com/x/log.txt?x=10d4b844280000 kernel config: https://syzkaller.appspot.com/x/.config?x=ee7e125556b25104 dashboard link: https://syzkaller.appspot.com/bug?extid=ef6edd9f1baaa54d6235 compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1543bf0c280000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=158f4664280000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/00b0f311889c/disk-81af97bd.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/a3291e9cce5a/vmlinux-81af97bd.xz kernel image: https://storage.googleapis.com/syzbot-assets/09b5e66af8b4/bzImage-81af97bd.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+ef6edd9f1baaa54d6235@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in ethnl_update_linkmodes net/ethtool/linkmodes.c:273 [inline] BUG: KMSAN: uninit-value in ethnl_set_linkmodes+0x190b/0x19d0 net/ethtool/linkmodes.c:333 ethnl_update_linkmodes net/ethtool/linkmodes.c:273 [inline] ethnl_set_linkmodes+0x190b/0x19d0 net/ethtool/linkmodes.c:333 ethnl_default_set_doit+0x88d/0xde0 net/ethtool/netlink.c:640 genl_family_rcv_msg_doit net/netlink/genetlink.c:968 [inline] genl_family_rcv_msg net/netlink/genetlink.c:1048 [inline] genl_rcv_msg+0x141a/0x14c0 net/netlink/genetlink.c:1065 netlink_rcv_skb+0x3f8/0x750 net/netlink/af_netlink.c:2577 genl_rcv+0x40/0x60 net/netlink/genetlink.c:1076 netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline] netlink_unicast+0xf41/0x1270 net/netlink/af_netlink.c:1365 netlink_sendmsg+0x127d/0x1430 net/netlink/af_netlink.c:1942 sock_sendmsg_nosec net/socket.c:724 [inline] sock_sendmsg net/socket.c:747 [inline] ____sys_sendmsg+0xa24/0xe40 net/socket.c:2501 ___sys_sendmsg+0x2a1/0x3f0 net/socket.c:2555 __sys_sendmsg net/socket.c:2584 [inline] __do_sys_sendmsg net/socket.c:2593 [inline] __se_sys_sendmsg net/socket.c:2591 [inline] __x64_sys_sendmsg+0x36b/0x540 net/socket.c:2591 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Uninit was stored to memory at: tun_get_link_ksettings+0x37/0x60 drivers/net/tun.c:3544 __ethtool_get_link_ksettings+0x17b/0x260 net/ethtool/ioctl.c:441 ethnl_set_linkmodes+0xee/0x19d0 net/ethtool/linkmodes.c:327 ethnl_default_set_doit+0x88d/0xde0 net/ethtool/netlink.c:640 genl_family_rcv_msg_doit net/netlink/genetlink.c:968 [inline] genl_family_rcv_msg net/netlink/genetlink.c:1048 [inline] genl_rcv_msg+0x141a/0x14c0 net/netlink/genetlink.c:1065 netlink_rcv_skb+0x3f8/0x750 net/netlink/af_netlink.c:2577 genl_rcv+0x40/0x60 net/netlink/genetlink.c:1076 netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline] netlink_unicast+0xf41/0x1270 net/netlink/af_netlink.c:1365 netlink_sendmsg+0x127d/0x1430 net/netlink/af_netlink.c:1942 sock_sendmsg_nosec net/socket.c:724 [inline] sock_sendmsg net/socket.c:747 [inline] ____sys_sendmsg+0xa24/0xe40 net/socket.c:2501 ___sys_sendmsg+0x2a1/0x3f0 net/socket.c:2555 __sys_sendmsg net/socket.c:2584 [inline] __do_sys_sendmsg net/socket.c:2593 [inline] __se_sys_sendmsg net/socket.c:2591 [inline] __x64_sys_sendmsg+0x36b/0x540 net/socket.c:2591 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Uninit was stored to memory at: tun_set_link_ksettings+0x37/0x60 drivers/net/tun.c:3553 ethtool_set_link_ksettings+0x600/0x690 net/ethtool/ioctl.c:609 __dev_ethtool net/ethtool/ioctl.c:3024 [inline] dev_ethtool+0x1db9/0x2a70 net/ethtool/ioctl.c:3078 dev_ioctl+0xb07/0x1270 net/core/dev_ioctl.c:524 sock_do_ioctl+0x295/0x540 net/socket.c:1213 sock_ioctl+0x729/0xd90 net/socket.c:1316 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0x222/0x400 fs/ioctl.c:856 __x64_sys_ioctl+0x96/0xe0 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Local variable link_ksettings created at: ethtool_set_link_ksettings+0x54/0x690 net/ethtool/ioctl.c:577 __dev_ethtool net/ethtool/ioctl.c:3024 [inline] dev_ethtool+0x1db9/0x2a70 net/ethtool/ioctl.c:3078 CPU: 1 PID: 4952 Comm: syz-executor743 Not tainted 6.3.0-syzkaller-g81af97bdef5e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023 ===================================================== --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.