size we receive here should fit into the receive buffer. Unfortunately, there's no 100% foolproof way to distinguish a ridiculously large record size that a client actually meant to send us from a ridiculously large record size that was sent as a spoof attempt. The one value that we can positively identify as bogus is zero. A zero-sized record makes absolutely no sense, and sending an endless supply of zeroes will cause the server to loop forever trying to fill its receive buffer. Note that the changes made to readtcp() make it okay to revert this sanity test since the deadlock case where a client can keep the server occupied forever in the readtcp() select() loop can't happen anymore. This solution is not ideal, but is relatively easy to implement. The ideal solution would be to re-arrange the way dispatching is handled so that the select() loop in readtcp() can be eliminated, but this is difficult to implement. I do plan to implement the complete solution eventually but in the meantime I don't want to leave the RPC library totally vulnerable. That you very much Sun, may I have another.
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This is the top level of the FreeBSD source directory. This file was last revised on: $Id: README,v 1.10 1997/02/23 09:18:39 peter Exp $ For copyright information, please see the file COPYRIGHT in this directory (additional copyright information also exists for some sources in this tree - please see the specific source directories for more information). The Makefile in this directory supports a number of targets for building components (or all) of the FreeBSD source tree, the most commonly used one being ``world'', which rebuilds and installs everything in the FreeBSD system from the source tree except the kernel and the contents of /etc. Please see the top of the Makefile in this directory for more information on the standard build targets and compile-time flags. Building a kernel with config(8) is a somewhat more involved process, documentation for which can be found at: http://www.freebsd.org/handbook/kernelconfig.html And in the config(8) man page. The sample kernel configuration files reside in the sys/i386/conf sub-directory (assuming that you've installed the kernel sources), the file named GENERIC being the one used to build your initial installation kernel. The file LINT contains entries for all possible devices, not just those commonly used, and is meant more as a general reference than an actual kernel configuration file (a kernel built from it wouldn't even run). Source Roadmap: --------------- bin System/User commands. contrib Packages contributed by 3rd parties. eBones Kerberos package - NOT FOR EXPORT! etc Template files for /etc games Amusements. gnu Various commands and libraries under the GNU Public License. Please see gnu/COPYING* for more information. include System include files. lib System libraries. libexec System daemons. lkm Loadable Kernel Modules. release Release building Makefile & associated tools. sbin System commands. secure DES and DES-related utilities - NOT FOR EXPORT! share Shared resources. sys Kernel sources. tools Utilities for regression testing and miscellaneous tasks. usr.bin User commands. usr.sbin System administration commands. For information on synchronizing your source tree with one or more of the FreeBSD Project's development branches, please see: http://www.freebsd.org/handbook/synching.html
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