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Support killing of suid programs.

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Now ``killall xterm'' works :-)

Don't fail for processes with meta chars (c+++)
This commit is contained in:
Wolfram Schneider 1996-02-03 22:52:27 +00:00
parent d70e4e53de
commit da2375658e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=13893
2 changed files with 65 additions and 38 deletions
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36
usr.bin/killall/killall.1
View File

@ -22,7 +22,7 @@
.\" IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
.\" POSSIBILITY OF SUCH DAMAGE.
.\"
.\" $Id: killall.1,v 1.1.1.1 1995/06/25 18:08:27 joerg Exp $
.\" $Id: killall.1,v 1.4 1996/02/03 21:50:20 wosch Exp $
.\"
.Dd June 25, 1995
.Os FreeBSD 2.2
@ -93,6 +93,17 @@ The signal may be specified either as a name
or numerically.
.El
.Sh ALL PROCESSES
Sending a signal to all processes with uid
.Nm XYZ
is already supported by
.Xr kill 1 .
So use
.Xr kill 1
for this job (e.g. $ kill -TERM -1 or
as root $ echo kill -TERM -1 | su -m <user>)
.Sh DIAGNOSTICS
The
.Nm
@ -107,12 +118,11 @@ Diagnostic messages will only be printed if requested by
options.
.Sh SEE ALSO
.Xr kill 1 ,
.Xr perl 1 ,
.Xr procfs 5 .
.Sh HISTORY
The
.Nm
command appeared in FreeBSD 2.2. It has been featured after the
command appeared in FreeBSD 2.1. It has been featured after the
.Nm
command as available on other platforms.
.Sh AUTHOR
@ -120,11 +130,15 @@ The program has been contributed by Wolfram Schneider, this manual
page has been written by
.if n Joerg Wunsch.
.if t J\(:org Wunsch.
.Sh BUGS
Due to limitations in the current implementation of
.Xr procfs 5 ,
it is only possible to figure out the effective UID of a process.
Hence it is impossible to find processes that run setuid, thus a
regular user will not be able to use
.Nm
to send signals to such processes.
.\" Fixed in FreeBSD-current, Feb 1996
.\"
.\" .Sh BUGS
.\" Due to limitations in the current implementation of
.\" .Xr procfs 5 ,
.\" it is only possible to figure out the effective UID of a process.
.\" Hence it is impossible to find processes that run setuid, thus a
.\" regular user will not be able to use
.\" .Nm
.\" to send signals to such processes.

67
usr.bin/killall/killall.pl
View File

@ -1,7 +1,7 @@
#!/usr/bin/perl
#
# Copyright (c) 1995 Wolfram Schneider <wosch@cs.tu-berlin.de>
# All rights reserved. Alle Rechte vorbehalten.
# Copyright (c) 1995 Wolfram Schneider, Berlin
# All rights reserved. Alle Rechte vorbehalten.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
@ -28,62 +28,73 @@
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# killall - kill all processes
# killall - kill processes by name
#
# Note: work only with effective uid due the limit of procfs
# (eg. not with suid programs)
#
# $Id: killall.pl,v 1.1.1.1 1995/06/25 18:08:27 joerg Exp $
# $Id: killall.pl,v 1.4 1996/02/03 21:49:56 wosch Exp $
#
$ENV{'PATH'} = "/bin:/usr/bin";
$ENV{'PATH'} = '/bin:/usr/bin'; # security
$procfs = '/proc';
$signal = 'SIGTERM'; # default signal for kill
$debug = 0;
$match = 0; # 0 match exactly program name
$show = 0;
$show = 0; # do nothings
$PROC_NAME = 0 + $[;
$PROC_EUID = 11 + $[;
# see /sys/miscfs/procfs/procfs_status.c
$PROC_NAME = 0;
$PROC_EUID = 11;
$PROC_RUID = 12;
sub usage {
$! = 2;
die "killall [-v] [-?|-help] [-l] [-m] [-s] [-SIGNAL] program\n";
die "killall [-?|-help] [-d] [-l] [-m] [-s] [-SIGNAL] program\n";
}
$id = $<; # real uid of this process / your id
while ($_ = $ARGV[0], /^-/) {
shift @ARGV;
if (/^--$/) { $_ = $ARGV[0]; last }
elsif (/^-[vd]$/) { $debug++ }
elsif (/^-(h|help|\?)$/) { do usage }
elsif (/^-l$/) { exec 'kill', '-l' }
if (/^--$/) { $_ = $ARGV[0]; last }
elsif (/^-(h|help|\?)$/) { &usage }
elsif (/^-[dv]$/) { $debug++ }
elsif (/^-l$/) { exec 'kill', '-l' }
elsif (/^-m$/) { $match = 1 }
elsif (/^-s$/) { $show = 1 }
elsif (/^-s$/) { $show = 1 }
elsif (/^-([a-z][a-z0-9]+|[0-9]+)$/i) { $signal = $1 }
elsif (/^-/) { &usage }
}
$program = $_; &usage unless $program;
die "Maybe $procfs is not mounted\n" unless -e "$procfs/0/status";
opendir(PROCFS, "$procfs") || die "$procfs $!\n";
print " PID EUID RUID COMMAND\n" if $debug > 1;
# quote meta characters
($programMatch = $program) =~ s/(\W)/\\$1/g;
foreach (sort{$a <=> $b} grep(/^[0-9]/, readdir(PROCFS))) {
$status = "$procfs/$_/status";
$pid = $_;
next if $pid == $$; # don't kill yourself
open(STATUS, "$status") || next; # process maybe already terminated
open(STATUS, "$status") || next; # process maybe already terminated
while(<STATUS>) {
@proc = split;
printf "%5d $proc[$PROC_NAME] $proc[$PROC_EUID]\n", $pid
if $debug > 1;
if (($proc[$PROC_NAME] eq $program ||
($match && $proc[$PROC_NAME] =~ /$program/i)
) && # test program name
($proc[$PROC_EUID] eq $< || $< == 0)) { # test uid
push(@kill, "$pid");
printf "%5d %5d %5d %s\n", $pid, $proc[$PROC_EUID],
$proc[$PROC_RUID], $proc[$PROC_NAME] if $debug > 1;
if ( # match program name
($proc[$PROC_NAME] eq $program ||
($match && $proc[$PROC_NAME] =~ /$programMatch/oi)
) &&
# id test
($proc[$PROC_EUID] eq $id || # effective uid
$proc[$PROC_RUID] eq $id || # real uid
!$id)) # root
{
push(@kill, $pid);
}
}
close STATUS;
@ -94,10 +105,12 @@ if ($#kill < 0) { # nothing found
print "No matching process.\n" if $debug || $show;
exit(1);
}
$signal =~ y/[a-z]/[A-Z]/; # signal name in upper case
$signal =~ y/a-z/A-Z/; # signal name in upper case
$signal =~ s/^SIG//; # strip a leading SIG if present
print "kill -$signal @kill\n" if $debug || $show;
$cnt = kill ($signal, @kill) unless $show; # kill processes
exit(0) if $show || $cnt == $#kill + 1;
exit(1);