Date: Fri, 28 Jan 2011 10:08:37 -0600 From: Tom Judge <tom@tomjudge.com> To: freebsd-security@freebsd.org Subject: Re: Recent full disclosure post - Local DOS Message-ID: <4D42EA05.2070707@tomjudge.com> In-Reply-To: <4D42D2B2.4030806@tomjudge.com> References: <4D42D2B2.4030806@tomjudge.com>
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On 01/28/2011 08:29 AM, Tom Judge wrote: > > Has anyone looked at this: > > [Full-disclosure] FreeBSD local denial of service - forced reboot > > http://lists.grok.org.uk/pipermail/full-disclosure/2011-January/078836.html > I have done some simple tests on ESXi 4.1.0, 260247. releng/8.1 - i386 - Not repeatable. releng/8.2-RC1 - amd64 - Not repeatable. current 9.0-CURRENT-201011 - i386 - Repeatable: Unread portion of the kernel message buffer: panic: tcp_output: mbuf chain shorter than expected cpuid = 0 KDB: enter: panic Physical memory: 239 MB Dumping 99 MB: 84 68 52 36 20 4 (kgdb) bt #0 doadump () at pcpu.h:231 #1 0xc04d5809 in db_fncall (dummy1=1, dummy2=0, dummy3=-1057111072, dummy4=0xcd0cc78c "") at /usr/src/sys/ddb/db_command.c:548 #2 0xc04d5c01 in db_command (last_cmdp=0xc0e0e27c, cmd_table=0x0, dopager=1) at /usr/src/sys/ddb/db_command.c:445 #3 0xc04d5d5a in db_command_loop () at /usr/src/sys/ddb/db_command.c:498 #4 0xc04d7c7d in db_trap (type=3, code=0) at /usr/src/sys/ddb/db_main.c:229 #5 0xc08ee99e in kdb_trap (type=3, code=0, tf=0xcd0cc930) at /usr/src/sys/kern/subr_kdb.c:546 #6 0xc0bfcf5b in trap (frame=0xcd0cc930) at /usr/src/sys/i386/i386/trap.c:732 #7 0xc0be5e8c in calltrap () at /usr/src/sys/i386/i386/exception.s:168 #8 0xc08eeb6a in kdb_enter (why=0xc0cddbdf "panic", msg=0xc0cddbdf "panic") at cpufunc.h:71 #9 0xc08bba04 in panic (fmt=0xc0cfb014 "%s: mbuf chain shorter than expected") at /usr/src/sys/kern/kern_shutdown.c:574 #10 0xc0a3ecc6 in tcp_output (tp=0xc2789768) at /usr/src/sys/netinet/tcp_output.c:1084 #11 0xc0a4a309 in tcp_ctloutput (so=0xc3a179a8, sopt=0xcd0ccc0c) at /usr/src/sys/netinet/tcp_usrreq.c:1328 #12 0xc092742d in sosetopt (so=0xc3a179a8, sopt=0xcd0ccc0c) at /usr/src/sys/kern/uipc_socket.c:2396 #13 0xc092ec95 in kern_setsockopt (td=0xc33b1b40, s=4, level=6, name=4, val=0xbfbfdacc, valseg=UIO_USERSPACE, valsize=4) at /usr/src/sys/kern/uipc_syscalls.c:1335 #14 0xc092ed1e in setsockopt (td=0xc33b1b40, uap=0xcd0cccec) at /usr/src/sys/kern/uipc_syscalls.c:1290 #15 0xc08fc103 in syscallenter (td=0xc33b1b40, sa=0xcd0ccce4) at /usr/src/sys/kern/subr_trap.c:318 #16 0xc0bfc804 in syscall (frame=0xcd0ccd28) at /usr/src/sys/i386/i386/trap.c:1095 #17 0xc0be5ef1 in Xint0x80_syscall () at /usr/src/sys/i386/i386/exception.s:266 #18 0x00000033 in ?? () Previous frame inner to this frame (corrupt stack?) (kgdb) None ESXi armv5te IOP 80321 current -r216409 - Not repeatable. I am in the process of building a more up to date current to do another test. Tom -- TJU13-ARIN
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