src/test/test-mount-util.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <sys/mount.h>
   4
   5 #include "alloc-util.h"
   6 #include "def.h"
   7 #include "fd-util.h"
   8 #include "fileio.h"
   9 #include "hashmap.h"
  10 #include "log.h"
  11 #include "log.h"
  12 #include "mount-util.h"
  13 #include "path-util.h"
  14 #include "rm-rf.h"
  15 #include "string-util.h"
  16 #include "tests.h"
  17
  18 static void test_mount_propagation_flags(const char *name, int ret, unsigned long expected) {
  19         long unsigned flags;
  20
  21         assert_se(mount_propagation_flags_from_string(name, &flags) == ret);
  22
  23         if (ret >= 0) {
  24                 const char *c;
  25
  26                 assert_se(flags == expected);
  27
  28                 c = mount_propagation_flags_to_string(flags);
  29                 if (isempty(name))
  30                         assert_se(isempty(c));
  31                 else
  32                         assert_se(streq(c, name));
  33         }
  34 }
  35
  36 static void test_mnt_id(void) {
  37         _cleanup_fclose_ FILE *f = NULL;
  38         Hashmap *h;
  39         Iterator i;
  40         char *p;
  41         void *k;
  42         int r;
  43
  44         assert_se(f = fopen("/proc/self/mountinfo", "re"));
  45         assert_se(h = hashmap_new(&trivial_hash_ops));
  46
  47         for (;;) {
  48                 _cleanup_free_ char *line = NULL, *path = NULL;
  49                 int mnt_id;
  50
  51                 r = read_line(f, LONG_LINE_MAX, &line);
  52                 if (r == 0)
  53                         break;
  54                 assert_se(r > 0);
  55
  56                 assert_se(sscanf(line, "%i %*s %*s %*s %ms", &mnt_id, &path) == 2);
  57
  58                 assert_se(hashmap_put(h, INT_TO_PTR(mnt_id), path) >= 0);
  59                 path = NULL;
  60         }
  61
  62         HASHMAP_FOREACH_KEY(p, k, h, i) {
  63                 int mnt_id = PTR_TO_INT(k), mnt_id2;
  64
  65                 r = path_get_mnt_id(p, &mnt_id2);
  66                 if (r < 0) {
  67                         log_debug_errno(r, "Failed to get the mnt id of %s: %m\n", p);
  68                         continue;
  69                 }
  70
  71                 log_debug("mnt id of %s is %i\n", p, mnt_id2);
  72
  73                 if (mnt_id == mnt_id2)
  74                         continue;
  75
  76                 /* The ids don't match? If so, then there are two mounts on the same path, let's check if that's really
  77                  * the case */
  78                 assert_se(path_equal_ptr(hashmap_get(h, INT_TO_PTR(mnt_id2)), p));
  79         }
  80
  81         hashmap_free_free(h);
  82 }
  83
  84 static void test_path_is_mount_point(void) {
  85         int fd;
  86         char tmp_dir[] = "/tmp/test-path-is-mount-point-XXXXXX";
  87         _cleanup_free_ char *file1 = NULL, *file2 = NULL, *link1 = NULL, *link2 = NULL;
  88         _cleanup_free_ char *dir1 = NULL, *dir1file = NULL, *dirlink1 = NULL, *dirlink1file = NULL;
  89         _cleanup_free_ char *dir2 = NULL, *dir2file = NULL;
  90
  91         assert_se(path_is_mount_point("/", NULL, AT_SYMLINK_FOLLOW) > 0);
  92         assert_se(path_is_mount_point("/", NULL, 0) > 0);
  93         assert_se(path_is_mount_point("//", NULL, AT_SYMLINK_FOLLOW) > 0);
  94         assert_se(path_is_mount_point("//", NULL, 0) > 0);
  95
  96         assert_se(path_is_mount_point("/proc", NULL, AT_SYMLINK_FOLLOW) > 0);
  97         assert_se(path_is_mount_point("/proc", NULL, 0) > 0);
  98         assert_se(path_is_mount_point("/proc/", NULL, AT_SYMLINK_FOLLOW) > 0);
  99         assert_se(path_is_mount_point("/proc/", NULL, 0) > 0);
 100
 101         assert_se(path_is_mount_point("/proc/1", NULL, AT_SYMLINK_FOLLOW) == 0);
 102         assert_se(path_is_mount_point("/proc/1", NULL, 0) == 0);
 103         assert_se(path_is_mount_point("/proc/1/", NULL, AT_SYMLINK_FOLLOW) == 0);
 104         assert_se(path_is_mount_point("/proc/1/", NULL, 0) == 0);
 105
 106         assert_se(path_is_mount_point("/sys", NULL, AT_SYMLINK_FOLLOW) > 0);
 107         assert_se(path_is_mount_point("/sys", NULL, 0) > 0);
 108         assert_se(path_is_mount_point("/sys/", NULL, AT_SYMLINK_FOLLOW) > 0);
 109         assert_se(path_is_mount_point("/sys/", NULL, 0) > 0);
 110
 111         /* we'll create a hierarchy of different kinds of dir/file/link
 112          * layouts:
 113          *
 114          * <tmp>/file1, <tmp>/file2
 115          * <tmp>/link1 -> file1, <tmp>/link2 -> file2
 116          * <tmp>/dir1/
 117          * <tmp>/dir1/file
 118          * <tmp>/dirlink1 -> dir1
 119          * <tmp>/dirlink1file -> dirlink1/file
 120          * <tmp>/dir2/
 121          * <tmp>/dir2/file
 122          */
 123
 124         /* file mountpoints */
 125         assert_se(mkdtemp(tmp_dir) != NULL);
 126         file1 = path_join(NULL, tmp_dir, "file1");
 127         assert_se(file1);
 128         file2 = path_join(NULL, tmp_dir, "file2");
 129         assert_se(file2);
 130         fd = open(file1, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC, 0664);
 131         assert_se(fd > 0);
 132         close(fd);
 133         fd = open(file2, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC, 0664);
 134         assert_se(fd > 0);
 135         close(fd);
 136         link1 = path_join(NULL, tmp_dir, "link1");
 137         assert_se(link1);
 138         assert_se(symlink("file1", link1) == 0);
 139         link2 = path_join(NULL, tmp_dir, "link2");
 140         assert_se(link1);
 141         assert_se(symlink("file2", link2) == 0);
 142
 143         assert_se(path_is_mount_point(file1, NULL, AT_SYMLINK_FOLLOW) == 0);
 144         assert_se(path_is_mount_point(file1, NULL, 0) == 0);
 145         assert_se(path_is_mount_point(link1, NULL, AT_SYMLINK_FOLLOW) == 0);
 146         assert_se(path_is_mount_point(link1, NULL, 0) == 0);
 147
 148         /* directory mountpoints */
 149         dir1 = path_join(NULL, tmp_dir, "dir1");
 150         assert_se(dir1);
 151         assert_se(mkdir(dir1, 0755) == 0);
 152         dirlink1 = path_join(NULL, tmp_dir, "dirlink1");
 153         assert_se(dirlink1);
 154         assert_se(symlink("dir1", dirlink1) == 0);
 155         dirlink1file = path_join(NULL, tmp_dir, "dirlink1file");
 156         assert_se(dirlink1file);
 157         assert_se(symlink("dirlink1/file", dirlink1file) == 0);
 158         dir2 = path_join(NULL, tmp_dir, "dir2");
 159         assert_se(dir2);
 160         assert_se(mkdir(dir2, 0755) == 0);
 161
 162         assert_se(path_is_mount_point(dir1, NULL, AT_SYMLINK_FOLLOW) == 0);
 163         assert_se(path_is_mount_point(dir1, NULL, 0) == 0);
 164         assert_se(path_is_mount_point(dirlink1, NULL, AT_SYMLINK_FOLLOW) == 0);
 165         assert_se(path_is_mount_point(dirlink1, NULL, 0) == 0);
 166
 167         /* file in subdirectory mountpoints */
 168         dir1file = path_join(NULL, dir1, "file");
 169         assert_se(dir1file);
 170         fd = open(dir1file, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC, 0664);
 171         assert_se(fd > 0);
 172         close(fd);
 173
 174         assert_se(path_is_mount_point(dir1file, NULL, AT_SYMLINK_FOLLOW) == 0);
 175         assert_se(path_is_mount_point(dir1file, NULL, 0) == 0);
 176         assert_se(path_is_mount_point(dirlink1file, NULL, AT_SYMLINK_FOLLOW) == 0);
 177         assert_se(path_is_mount_point(dirlink1file, NULL, 0) == 0);
 178
 179         /* these tests will only work as root */
 180         if (mount(file1, file2, NULL, MS_BIND, NULL) >= 0) {
 181                 int rf, rt, rdf, rdt, rlf, rlt, rl1f, rl1t;
 182                 const char *file2d;
 183
 184                 /* files */
 185                 /* capture results in vars, to avoid dangling mounts on failure */
 186                 log_info("%s: %s", __func__, file2);
 187                 rf = path_is_mount_point(file2, NULL, 0);
 188                 rt = path_is_mount_point(file2, NULL, AT_SYMLINK_FOLLOW);
 189
 190                 file2d = strjoina(file2, "/");
 191                 log_info("%s: %s", __func__, file2d);
 192                 rdf = path_is_mount_point(file2d, NULL, 0);
 193                 rdt = path_is_mount_point(file2d, NULL, AT_SYMLINK_FOLLOW);
 194
 195                 log_info("%s: %s", __func__, link2);
 196                 rlf = path_is_mount_point(link2, NULL, 0);
 197                 rlt = path_is_mount_point(link2, NULL, AT_SYMLINK_FOLLOW);
 198
 199                 assert_se(umount(file2) == 0);
 200
 201                 assert_se(rf == 1);
 202                 assert_se(rt == 1);
 203                 assert_se(rdf == -ENOTDIR);
 204                 assert_se(rdt == -ENOTDIR);
 205                 assert_se(rlf == 0);
 206                 assert_se(rlt == 1);
 207
 208                 /* dirs */
 209                 dir2file = path_join(NULL, dir2, "file");
 210                 assert_se(dir2file);
 211                 fd = open(dir2file, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC, 0664);
 212                 assert_se(fd > 0);
 213                 close(fd);
 214
 215                 assert_se(mount(dir2, dir1, NULL, MS_BIND, NULL) >= 0);
 216
 217                 log_info("%s: %s", __func__, dir1);
 218                 rf = path_is_mount_point(dir1, NULL, 0);
 219                 rt = path_is_mount_point(dir1, NULL, AT_SYMLINK_FOLLOW);
 220                 log_info("%s: %s", __func__, dirlink1);
 221                 rlf = path_is_mount_point(dirlink1, NULL, 0);
 222                 rlt = path_is_mount_point(dirlink1, NULL, AT_SYMLINK_FOLLOW);
 223                 log_info("%s: %s", __func__, dirlink1file);
 224                 /* its parent is a mount point, but not /file itself */
 225                 rl1f = path_is_mount_point(dirlink1file, NULL, 0);
 226                 rl1t = path_is_mount_point(dirlink1file, NULL, AT_SYMLINK_FOLLOW);
 227
 228                 assert_se(umount(dir1) == 0);
 229
 230                 assert_se(rf == 1);
 231                 assert_se(rt == 1);
 232                 assert_se(rlf == 0);
 233                 assert_se(rlt == 1);
 234                 assert_se(rl1f == 0);
 235                 assert_se(rl1t == 0);
 236
 237         } else
 238                 printf("Skipping bind mount file test: %m\n");
 239
 240         assert_se(rm_rf(tmp_dir, REMOVE_ROOT|REMOVE_PHYSICAL) == 0);
 241 }
 242
 243 static void test_mount_option_mangle(void) {
 244         char *opts = NULL;
 245         unsigned long f;
 246
 247         assert_se(mount_option_mangle(NULL, MS_RDONLY|MS_NOSUID, &f, &opts) == 0);
 248         assert_se(f == (MS_RDONLY|MS_NOSUID));
 249         assert_se(opts == NULL);
 250
 251         assert_se(mount_option_mangle("", MS_RDONLY|MS_NOSUID, &f, &opts) == 0);
 252         assert_se(f == (MS_RDONLY|MS_NOSUID));
 253         assert_se(opts == NULL);
 254
 255         assert_se(mount_option_mangle("ro,nosuid,nodev,noexec", 0, &f, &opts) == 0);
 256         assert_se(f == (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC));
 257         assert_se(opts == NULL);
 258
 259         assert_se(mount_option_mangle("ro,nosuid,nodev,noexec,mode=755", 0, &f, &opts) == 0);
 260         assert_se(f == (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC));
 261         assert_se(streq(opts, "mode=755"));
 262         opts = mfree(opts);
 263
 264         assert_se(mount_option_mangle("rw,nosuid,foo,hogehoge,nodev,mode=755", 0, &f, &opts) == 0);
 265         assert_se(f == (MS_NOSUID|MS_NODEV));
 266         assert_se(streq(opts, "foo,hogehoge,mode=755"));
 267         opts = mfree(opts);
 268
 269         assert_se(mount_option_mangle("rw,nosuid,nodev,noexec,relatime,net_cls,net_prio", MS_RDONLY, &f, &opts) == 0);
 270         assert_se(f == (MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_RELATIME));
 271         assert_se(streq(opts, "net_cls,net_prio"));
 272         opts = mfree(opts);
 273
 274         assert_se(mount_option_mangle("rw,nosuid,nodev,relatime,size=1630748k,mode=700,uid=1000,gid=1000", MS_RDONLY, &f, &opts) == 0);
 275         assert_se(f == (MS_NOSUID|MS_NODEV|MS_RELATIME));
 276         assert_se(streq(opts, "size=1630748k,mode=700,uid=1000,gid=1000"));
 277         opts = mfree(opts);
 278
 279         assert_se(mount_option_mangle("size=1630748k,rw,gid=1000,,,nodev,relatime,,mode=700,nosuid,uid=1000", MS_RDONLY, &f, &opts) == 0);
 280         assert_se(f == (MS_NOSUID|MS_NODEV|MS_RELATIME));
 281         assert_se(streq(opts, "size=1630748k,gid=1000,mode=700,uid=1000"));
 282         opts = mfree(opts);
 283
 284         assert_se(mount_option_mangle("rw,exec,size=8143984k,nr_inodes=2035996,mode=755", MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV, &f, &opts) == 0);
 285         assert_se(f == (MS_NOSUID|MS_NODEV));
 286         assert_se(streq(opts, "size=8143984k,nr_inodes=2035996,mode=755"));
 287         opts = mfree(opts);
 288
 289         assert_se(mount_option_mangle("rw,relatime,fmask=0022,,,dmask=0022", MS_RDONLY, &f, &opts) == 0);
 290         assert_se(f == MS_RELATIME);
 291         assert_se(streq(opts, "fmask=0022,dmask=0022"));
 292         opts = mfree(opts);
 293
 294         assert_se(mount_option_mangle("rw,relatime,fmask=0022,dmask=0022,\"hogehoge", MS_RDONLY, &f, &opts) < 0);
 295 }
 296
 297 int main(int argc, char *argv[]) {
 298
 299         test_setup_logging(LOG_DEBUG);
 300
 301         test_mount_propagation_flags("shared", 0, MS_SHARED);
 302         test_mount_propagation_flags("slave", 0, MS_SLAVE);
 303         test_mount_propagation_flags("private", 0, MS_PRIVATE);
 304         test_mount_propagation_flags(NULL, 0, 0);
 305         test_mount_propagation_flags("", 0, 0);
 306         test_mount_propagation_flags("xxxx", -EINVAL, 0);
 307         test_mount_propagation_flags(" ", -EINVAL, 0);
 308
 309         test_mnt_id();
 310         test_path_is_mount_point();
 311         test_mount_option_mangle();
 312
 313         return 0;
 314 }