[16616] in Athena Bugs
sun 8.2.15: athena inetd environment lossage
daemon@ATHENA.MIT.EDU (John Hawkinson)
Mon Jan 18 05:05:54 1999
Date: Mon, 18 Jan 1999 05:05:50 -0500 (EST)
To: bugs@MIT.EDU
From: John Hawkinson <jhawk@MIT.EDU>
I noticed that telnetd on mary-kay-commandos was closing
connections immediately after openning them.
truss -f'ing inetd, I found:
18543: setsockopt(4, 65535, 8192, 0xEFFFC1B4, 4) = 0
18543: fcntl(4, F_SETFL, 0x00000002) = 0
18543: close(4) = 0
18543: sysinfo(SI_HOSTNAME, "mary-kay-commandos.mit.edu", 256) = 27
18543: open("/etc/prelogin", O_RDONLY) Err#2 ENOENT
18543: stat("/mit/jhawk/krb5.conf", 0xEFFFF058) Err#2 ENOENT
18543: stat("/mit/jhawk/krb5.conf", 0xEFFFF058) Err#2 ENOENT
18543: stat("/mit/jhawk/krb5.conf", 0xEFFFF058) Err#2 ENOENT
18543: stat("/mit/jhawk/krb5.conf", 0xEFFFEE70) Err#2 ENOENT
18543: Incurred fault #6, FLTBOUNDS %pc = 0x00067058
18543: siginfo: SIGSEGV SEGV_MAPERR addr=0x0000001C
18543: Received signal #11, SIGSEGV [default]
18543: siginfo: SIGSEGV SEGV_MAPERR addr=0x0000001C
18543: *** process killed ***
it appears that some time ago I restarted the athena
inetd with my (jhawk's) environment:
ary-kay-commandos.mit.edu# /usr/ucb/ps auxwwe 18878
USER PID %CPU %MEM SZ RSS TT S START TIME COMMAND
root 18878 0.0 1.6 1608 984 ? S Dec 29 1:01 /etc/athena/inetd -n AMANPATH=/usr/local/man:/usr/athena/man:/usr/openwin/man:/usr/dt/man:/usr/man:/usr/dt/man:/usr/proc/man:/opt/SUNWrtvc/man APATH=/usr/local/bin:/srvd/patch:/usr/athena/bin:/bin/athena:/usr/openwin/bin:/usr/openwin/demo:/usr/bin:/usr/ccs/bin:/usr/andrew/bin:/usr/athena/etc:/usr/sbin:/sbin:/usr/ucb:/usr/dt/bin:/usr/proc/bin:/usr/multicast:/opt/SUNWrtvc/bin ATHENA_SYS=sun4x_56 CLASSPATH=/mit/jhawk/.interMute/classes.zip DISPLAY=:0.0 EDITOR=emacs FRAME_MSG=1 FRAME_MSG_VER=4 HOME=/mit/jhawk KRB5CCNAME=/tmp/krb5cc_ttyp0 KRB5_CONFIG=/mit/jhawk/krb5.conf KRBTKFILE=/tmp/tkt_ttyp0 MANPATH=/mit/jhawk/man:/usr/local/man:/usr/athena/man:/usr/openwin/man:/usr/dt/man:/usr/man:/usr/dt/man:/usr/proc/man:/opt/SUNWrtvc/man:/mit/emacs19/man:/mit/sipb/man:/mit/sipbnet/man:/mit/sipb/afsuser/man:/mit/crypto/man/man:/mit/net-tools/man:/mit/gnu/man:/mit/cygnus/man:/mit/mbone/man:/mit/watchmaker/man:/mit/outland/man:/mit!
/ops/man:/mit/consult/man:/mit/games/man NOMHNPROC=1 OPATH=/srvd/patch:/usr/athena/bin:/bin/athena:/usr/openwin/bin:/bin:/usr/ucb:/usr/sbin:/usr/andrew/bin:. OPENWINHOME=/usr/openwin PATH=/srvd/patch:/usr/athena/bin:/etc/athena:/usr/sbin:/sbin:/bin/athena:/usr/bin:/usr/ccs/bin:/usr/athena/etc:/usr/ucb:/usr/openwin/bin:/etc SHELL=/afs/sipb/project/tcsh/betatcsh TZ=US/Eastern USER=jhawk VISUAL=vi WGFILE=/tmp/wg.0WzbjY WWW_HOME=/afs/sipb/project/www/root/index.html XSESSION=18080 bindir=arch/sun4x_56/bin hosttype=sun4 TERM=xterm WINDOWID=12582925 LOGNAME=jhawk SHLVL=2 PWD=/mit/sipbzlog HOST=mary-kay-commandos.mit.edu HOSTTYPE=sun4 PS1=#
mary-kay-commandos.mit.edu# /usr/ucb/ps auxwwe 147
USER PID %CPU %MEM SZ RSS TT S START TIME COMMAND
root 147 0.0 1.2 1788 716 ? S Nov 28 0:00 /usr/sbin/inetd -s PATH=/usr/sbin:/usr/bin TZ=US/Eastern
Notice the system inetd has a much smaller environment ;-)
This problem goes away if I give the athena inetd a similar
small environment:
mary-kay-commandos.mit.edu# env - PATH=/usr/sbin:/usr/bin TZ=US/Eastern /etc/athena/inetd -n
So there's an easy workaround.
The problems would be helped somewhat if
/etc/init.d/athena allowed you to do things
like restart inetd. Or that if, when you pulled
the inetd restarting lines out of it, they worked ;-)
This argues in favor of a more modular init.d/athena, and
possibly having it run env.
Not sure if this is practical.
It also seems to be a bug that an unreadable KRB5_CONFIG causes
telnetd to SEGV. I seem to recall this coming up before with other k5
clients, so perhaps it's a generic library bug and maybe even fixed.
(I can't recall and am disinclined to go searching at the moment).
Hmm.
--jhawk
