From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f200.google.com (mail-il1-f200.google.com [209.85.166.200]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 733B219A297 for ; Tue, 3 Dec 2024 13:28:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.200 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733232537; cv=none; b=CPEstW8h5xsHlePzcsFQ/zzwocKvZr3erNw/L2ZnHxE70StbxG1xGghlkJwYhB1M+cSBqYGGBqTypMr0ObYAShpmlFVl/+2tB412iNRdM9UImxu5feChAsBrD/GmtOiAEoVz3kLVX/QcnPMSQOAWUnx319UwzRxkv6y9Q+I9OYg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733232537; c=relaxed/simple; bh=pRjhf2Ka/V0lakXwM7BNa9baS7Tn+JzqTO0O0o0NwwE=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=UBSB1SlNk6+22WNKK8j8DASCAtUI0WEzxeexrhRhvg95GhXeRdRpZ+oGgycJJGugwtH7w6PxxJNvTnHn7iiOYtGdYujHrFFEjBhUvDbQa6H1lrA6E5M0rwCeABt5padae4Hsrn5Gp5xVKMjySTwEEovjBW3E+r3UdWjmVdHQwzo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.166.200 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-il1-f200.google.com with SMTP id e9e14a558f8ab-3a77a0ca771so39351525ab.0 for ; Tue, 03 Dec 2024 05:28:55 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1733232534; x=1733837334; 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=DpOhvann8v6cfjJBUe309C4fInbf8Nc00R+1ZjGvUeI=; b=SAGRWAij/qmeQ7aK5qIgf7NstCZSSAv9J5WlFk7yzuP0AyfkfjGws6qqsGc2ZA1h1N EHwaqQqn9wyYUv3uEJ3d4sAQ3MchDcznC5ECSDtKS3KvmOqvf5x9+oTNXoPJsbAE9noF cJUXvKbX4MCeLnFdS59SrRsyfa0/Ne14xxZ2Y/etP704IPab9R9CG1EFsUZqDuZKUN/P pe2ccVaj4bdMOfSRsri3dcimgOUgI+l2+2V3SBF/d3nAbkwWYGonRH56oD0CPA7c5X1v F5x06gHkgEGx8pHeIXM1edJKOZ/yjPXd73xmRKwE/qJTHb5uARooI6VTsSp1eb4W+38U HX2w== X-Gm-Message-State: AOJu0YwVI3CdZvPnxEcRrcLB6evure+8vOeHilGa6u6MQf38FhGfMjTK OFPG7lfWj6YfySlfMktHpctoR1hpctjHZKHgf19Glc8zbJIVNlTTWaHamMqUrFtdBlL/mDm8YnW ogUL4vrDN0EaDPUXKK118mgmLDSoC3QAWfpe/ymTvwnuG1PBqv4gYqn0= X-Google-Smtp-Source: AGHT+IE5Fu9DD0aCX6k/12w3cDpl9/A44Z/cBJI3u/bPnyTd9vJOqj+AzaedvYBneTGgfPV8FxlIEtmz+EpXbl0myKbqoBhi2EkJ Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:13af:b0:3a6:ad61:7ff8 with SMTP id e9e14a558f8ab-3a7f9a56d35mr26198605ab.12.1733232534625; Tue, 03 Dec 2024 05:28:54 -0800 (PST) Date: Tue, 03 Dec 2024 05:28:54 -0800 In-Reply-To: <67409854.050a0220.363a1b.013f.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <674f0796.050a0220.48a03.0038.GAE@google.com> Subject: Re: [syzbot] Re: KMSAN: uninit-value in ip6table_mangle_hook() From: syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" For archival purposes, forwarding an incoming command email to linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com. *** Subject: Re: KMSAN: uninit-value in ip6table_mangle_hook() Author: dmantipov@yandex.ru #syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git cdd30ebb1b9f36159d66f088b61aee264e649d7a diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c index 48fd53b98972..00840249554a 100644 --- a/net/ipv6/ip6_tunnel.c +++ b/net/ipv6/ip6_tunnel.c @@ -1224,7 +1224,9 @@ int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield, (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { struct sk_buff *new_skb; - new_skb = skb_realloc_headroom(skb, max_headroom); + new_skb = skb_copy_expand(skb, max_headroom, + skb_tailroom(skb), + GFP_ATOMIC); if (!new_skb) goto tx_err_dst_release;