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From David Birnbaum <dav...@chelsea.net>
Subject suexec/5329: kill of CGI fails due to suexec permission change
Date Wed, 17 Nov 1999 20:47:33 GMT

>Number:         5329
>Category:       suexec
>Synopsis:       kill of CGI fails due to suexec permission change
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    apache
>State:          open
>Class:          sw-bug
>Submitter-Id:   apache
>Arrival-Date:   Wed Nov 17 12:50:01 PST 1999
>Last-Modified:
>Originator:     davidb@chelsea.net
>Organization:
apache
>Release:        1.3.9
>Environment:
SunOS spaten 5.6 Generic_105181-16 sun4m sparc SUNW,SPARCstation-20
>Description:
Truss shows hanging CGI.  Apache times out, tries to kill it and fails since
it no longer shares ownership.  The httpd process then hangs out until the 
CGI finally dies.  RLimit's help, but in this case the CGI process takes
a long time so we can't just arbitrarily set them low.

poll(0xEFFF75E8, 1, -1)         (sleeping...)
    Received signal #14, SIGALRM, in poll() [caught]
      siginfo: SIGALRM pid=6558 uid=0
poll(0xEFFF75E8, 1, -1)                         Err#4 EINTR
write(31, "1503\0\012D517D799 h EFA".., 23)     = 23
time()                                          = 942870983
time()                                          = 942870983
write(25, " [ 1 7 / N o v / 1 9 9 9".., 121)    = 121
close(31)                                       = 0
setcontext(0xEFFF73B0)
close(34)                                       = 0
read(36, 0x002D70B8, 4096)                      = 0
close(36)                                       = 0
time()                                          = 942870983
write(27, " 2 0 9 . 2 1 2 . 7 3 . 7".., 216)    = 216
time()                                          = 942870983
write(28, " 2 0 9 . 2 1 2 . 7 3 . 7".., 212)    = 212
times(0xEF7909CC)                               = 14890571
close(-1)                                       Err#9 EBADF
sigaction(SIGUSR1, 0xEFFFF830, 0xEFFFF8B0)      = 0
waitid(P_PID, 29031, 0xEFFFF6F8, WEXITED|WTRAPPED|WNOHANG) = 0
kill(29031, SIGTERM)                            Err#1 EPERM
kill(29031, SIGKILL)                            Err#1 EPERM
waitid(P_PID, 29031, 0xEFFFF6F8, WEXITED|WTRAPPED) (sleeping...)
>How-To-Repeat:
A CGI doing a sleep long enough should replicate it.
>Fix:
Um...er...well...no.  Perhaps the httpd process could fork suexec and
and ask it to kill the process?  I don't know if the child has any way 
of talking back to the parent.
>Audit-Trail:
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