summaryrefslogtreecommitdiff
path: root/tests/rm/fail-eperm.xpl
blob: 78afacb0e552bf80f1f932d3ed3c80c5b9719def (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
#!/usr/bin/perl -Tw
# Ensure that rm gives the expected diagnostic when failing to remove a file
# owned by some other user in a directory with the sticky bit set.

# Copyright (C) 2002-2016 Free Software Foundation, Inc.

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

use strict;

(my $ME = $0) =~ s|.*/||;

my $uid = $<;
# skip if root
$uid == 0
  and CuSkip::skip "$ME: can't run this test as root: skipping this test";

my $verbose = $ENV{VERBOSE} && $ENV{VERBOSE} eq 'yes';

# Ensure that the diagnostics are in English.
$ENV{LC_ALL} = 'C';

# Set up a safe, well-known environment
$ENV{IFS}  = '';

# Taint checking requires a sanitized $PATH.  This script performs no $PATH
# search, so on most Unix-based systems, it is fine simply to clear $ENV{PATH}.
# However, on Cygwin, it's used to find cygwin1.dll, so set it.
$ENV{PATH} = '/bin:/usr/bin';

my @dir_list = qw(/tmp /var/tmp /usr/tmp);
my $rm = "$ENV{abs_top_builddir}/src/rm";

# Untaint for upcoming popen.
$rm =~ m!^([-+\@\w./]+)$!
  or CuSkip::skip "$ME: unusual absolute builddir name; skipping this test\n";
$rm = $1;

# Find a directory with the sticky bit set.
my $found_dir;
my $found_file;
foreach my $dir (@dir_list)
  {
    if (-d $dir && -k _ && -r _ && -w _ && -x _)
      {
        $found_dir = 1;

        # Find a non-directory there that is owned by some other user.
        opendir DIR_HANDLE, $dir
          or die "$ME: couldn't open $dir: $!\n";

        foreach my $f (readdir DIR_HANDLE)
          {
            # Consider only names containing "safe" characters.
            $f =~ /^([-\@\w.]+)$/
              or next;
            $f = $1;    # untaint $f

            my $target_file = "$dir/$f";
            $verbose
              and warn "$ME: considering $target_file\n";

            # Skip files owned by self, symlinks, and directories.
            # It's not technically necessary to skip symlinks, but it's simpler.
            # SVR4-like systems (e.g., Solaris 9) let you unlink files that
            # you can write, so skip writable files too.
            -l $target_file || -o _ || -d _ || -w _
              and next;

            $found_file = 1;

            # Invoke rm on this file and ensure that we get the
            # expected exit code and diagnostic.
            my $cmd = "$rm -f -- $target_file";
            open RM, "$cmd 2>&1 |"
              or die "$ME: cannot execute '$cmd'\n";

            my $line = <RM>;

            close RM;
            my $rc = $?;
            # This test opportunistically looks for files that can't
            # be removed but those files may already have been removed
            # by their owners by the time we get to them.  It is a
            # race condition.  If so then the rm is successful and our
            # test is thwarted.  Detect this case and ignore.
            if ($rc == 0)
              {
                next if ! -e $target_file;
                die "$ME: unexpected exit status from '$cmd';\n"
                  . "  got 0, expected 1\n";
              }
            if (0x80 < $rc)
              {
                my $status = $rc >> 8;
                $status == 1
                  or die "$ME: unexpected exit status from '$cmd';\n"
                    . "  got $status, expected 1\n";
              }
            else
              {
                # Terminated by a signal.
                my $sig_num = $rc & 0x7F;
                die "$ME: command '$cmd' died with signal $sig_num\n";
              }

            my $exp = "rm: cannot remove '$target_file':";
            $line
              or die "$ME: no output from '$cmd';\n"
                . "expected something like '$exp ...'\n";

            # Transform the actual diagnostic so that it starts with "rm:".
            # Depending on your system, it might be "rm:" already, or
            # "../../src/rm:".
            $line =~ s,^\Q$rm\E:,rm:,;

            my $regex = quotemeta $exp;
            $line =~ /^$regex/
              or die "$ME: unexpected diagnostic from '$cmd';\n"
                . "  got      $line"
                . "  expected $exp ...\n";

            last;
          }

        closedir DIR_HANDLE;
        $found_file
          and last;
      }
  }

$found_dir
  or CuSkip::skip "$ME: couldn't find a directory with the sticky bit set;"
    . " skipping this test\n";

$found_file
  or CuSkip::skip "$ME: couldn't find a file not owned by you\n"
    . " in any of the following directories:\n  @dir_list\n"
    . "...so, skipping this test\n";