Date: Mon, 30 Sep 2019 17:21:55 +0300 From: Slawa Olhovchenkov <slw@zxy.spb.ru> To: Michael Tuexen <tuexen@FreeBSD.org> Cc: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r352868 - in head/sys/netinet: . tcp_stacks Message-ID: <20190930142155.GC38096@zxy.spb.ru> In-Reply-To: <201909291045.x8TAjD6J066797@repo.freebsd.org> References: <201909291045.x8TAjD6J066797@repo.freebsd.org>
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On Sun, Sep 29, 2019 at 10:45:13AM +0000, Michael Tuexen wrote: > Author: tuexen > Date: Sun Sep 29 10:45:13 2019 > New Revision: 352868 > URL: https://svnweb.freebsd.org/changeset/base/352868 > > Log: > RFC 7112 requires a host to put the complete IP header chain > including the TCP header in the first IP packet. > Enforce this in tcp_output(). In addition make sure that at least > one byte payload fits in the TCP segement to allow making progress. > Without this check, a kernel with INVARIANTS will panic. > This issue was found by running an instance of syzkaller. How to posible this? Host required to handle packets up to 576 bytes, how to IP and TCP options can exhaust this size?
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