summary refs log tree commit diff
path: root/io/tst-fchownat.c
blob: fd32ac9e6bdd31d1ff35eb73afb1a9885149ccb8 (plain) (blame)
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
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
#include <dirent.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>


static void prepare (void);
#define PREPARE(argc, argv) prepare ()

static int do_test (void);
#define TEST_FUNCTION do_test ()

#include "../test-skeleton.c"

static int dir_fd;

static void
prepare (void)
{
#if _POSIX_CHOWN_RESTRICTED > 0
  uid_t uid = getuid ();
  if (uid != 0)
    {
      puts ("need root privileges");
      exit (0);
    }
#endif

  size_t test_dir_len = strlen (test_dir);
  static const char dir_name[] = "/tst-fchownat.XXXXXX";

  size_t dirbuflen = test_dir_len + sizeof (dir_name);
  char *dirbuf = malloc (dirbuflen);
  if (dirbuf == NULL)
    {
      puts ("out of memory");
      exit (1);
    }

  snprintf (dirbuf, dirbuflen, "%s%s", test_dir, dir_name);
  if (mkdtemp (dirbuf) == NULL)
    {
      puts ("cannot create temporary directory");
      exit (1);
    }

  add_temp_file (dirbuf);

  dir_fd = open (dirbuf, O_RDONLY | O_DIRECTORY);
  if (dir_fd == -1)
    {
      puts ("cannot open directory");
      exit (1);
    }
}


static int
do_test (void)
{
  /* fdopendir takes over the descriptor, make a copy.  */
  int dupfd = dup (dir_fd);
  if (dupfd == -1)
    {
      puts ("dup failed");
      return 1;
    }
  if (lseek (dupfd, 0, SEEK_SET) != 0)
    {
      puts ("1st lseek failed");
      return 1;
    }

  /* The directory should be empty safe the . and .. files.  */
  DIR *dir = fdopendir (dupfd);
  if (dir == NULL)
    {
      puts ("fdopendir failed");
      return 1;
    }
  struct dirent64 *d;
  while ((d = readdir64 (dir)) != NULL)
    if (strcmp (d->d_name, ".") != 0 && strcmp (d->d_name, "..") != 0)
      {
	printf ("temp directory contains file \"%s\"\n", d->d_name);
	return 1;
      }
  closedir (dir);

  /* Try to create a file.  */
  int fd = openat (dir_fd, "some-file", O_CREAT|O_RDWR|O_EXCL, 0666);
  if (fd == -1)
    {
      if (errno == ENOSYS)
	{
	  puts ("*at functions not supported");
	  return 0;
	}

      puts ("file creation failed");
      return 1;
    }
  write (fd, "hello", 5);
  puts ("file created");

  struct stat64 st1;
  if (fstat64 (fd, &st1) != 0)
    {
      puts ("fstat64 failed");
      return 1;
    }

  /* Before closing the file, try using this file descriptor to open
     another file.  This must fail.  */
  if (fchownat (fd, "some-file", 1, 1, 0) != -1)
    {
      puts ("fchownat using descriptor for normal file worked");
      return 1;
    }
  if (errno != ENOTDIR)
    {
      puts ("\
error for fchownat using descriptor for normal file not ENOTDIR ");
      return 1;
    }

  close (fd);

  if (fchownat (dir_fd, "some-file", st1.st_uid + 1, st1.st_gid + 1, 0) != 0)
    {
      puts ("fchownat failed");
      return 1;
    }

  struct stat64 st2;
  if (fstatat64 (dir_fd, "some-file", &st2, 0) != 0)
    {
      puts ("fstatat64 failed");
      return 1;
    }

  if (st1.st_uid + 1 != st2.st_uid || st1.st_gid + 1 != st2.st_gid)
    {
      puts ("owner change failed");
      return 1;
    }

  if (unlinkat (dir_fd, "some-file", 0) != 0)
    {
      puts ("unlinkat failed");
      return 1;
    }

  /* Create a file descriptor which is closed again right away.  */
  int dir_fd2 = dup (dir_fd);
  if (dir_fd2 == -1)
    {
      puts ("dup failed");
      return 1;
    }
  close (dir_fd2);

  if (fchownat (dir_fd2, "some-file", 1, 1, 0) != -1)
    {
      puts ("fchownat using closed descriptor worked");
      return 1;
    }
  if (errno != EBADF)
    {
      puts ("error for fchownat using closed descriptor not EBADF ");
      return 1;
    }

  close (dir_fd);

  if (fchownat (-1, "some-file", 1, 1, 0) != -1)
    {
      puts ("fchownat using invalid descriptor worked");
      return 1;
    }
  if (errno != EBADF)
    {
      puts ("error for fchownat using invalid descriptor not EBADF ");
      return 1;
    }

  return 0;
}