src/test/test-mount-util.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   Copyright 2016 Lennart Poettering
   4 ***/
   5
   6 #include <sys/mount.h>
   7
   8 #include "alloc-util.h"
   9 #include "def.h"
  10 #include "fd-util.h"
  11 #include "fileio.h"
  12 #include "hashmap.h"
  13 #include "log.h"
  14 #include "log.h"
  15 #include "mount-util.h"
  16 #include "path-util.h"
  17 #include "rm-rf.h"
  18 #include "string-util.h"
  19
  20 static void test_mount_propagation_flags(const char *name, int ret, unsigned long expected) {
  21         long unsigned flags;
  22
  23         assert_se(mount_propagation_flags_from_string(name, &flags) == ret);
  24
  25         if (ret >= 0) {
  26                 const char *c;
  27
  28                 assert_se(flags == expected);
  29
  30                 c = mount_propagation_flags_to_string(flags);
  31                 if (isempty(name))
  32                         assert_se(isempty(c));
  33                 else
  34                         assert_se(streq(c, name));
  35         }
  36 }
  37
  38 static void test_mnt_id(void) {
  39         _cleanup_fclose_ FILE *f = NULL;
  40         Hashmap *h;
  41         Iterator i;
  42         char *p;
  43         void *k;
  44         int r;
  45
  46         assert_se(f = fopen("/proc/self/mountinfo", "re"));
  47         assert_se(h = hashmap_new(&trivial_hash_ops));
  48
  49         for (;;) {
  50                 _cleanup_free_ char *line = NULL, *path = NULL;
  51                 int mnt_id;
  52
  53                 r = read_line(f, LONG_LINE_MAX, &line);
  54                 if (r == 0)
  55                         break;
  56                 assert_se(r > 0);
  57
  58                 assert_se(sscanf(line, "%i %*s %*s %*s %ms", &mnt_id, &path) == 2);
  59
  60                 assert_se(hashmap_put(h, INT_TO_PTR(mnt_id), path) >= 0);
  61                 path = NULL;
  62         }
  63
  64         HASHMAP_FOREACH_KEY(p, k, h, i) {
  65                 int mnt_id = PTR_TO_INT(k), mnt_id2;
  66
  67                 r = path_get_mnt_id(p, &mnt_id2);
  68                 if (r < 0) {
  69                         log_debug_errno(r, "Failed to get the mnt id of %s: %m\n", p);
  70                         continue;
  71                 }
  72
  73                 log_debug("mnt id of %s is %i\n", p, mnt_id2);
  74
  75                 if (mnt_id == mnt_id2)
  76                         continue;
  77
  78                 /* The ids don't match? If so, then there are two mounts on the same path, let's check if that's really
  79                  * the case */
  80                 assert_se(path_equal_ptr(hashmap_get(h, INT_TO_PTR(mnt_id2)), p));
  81         }
  82
  83         hashmap_free_free(h);
  84 }
  85
  86 static void test_path_is_mount_point(void) {
  87         int fd;
  88         char tmp_dir[] = "/tmp/test-path-is-mount-point-XXXXXX";
  89         _cleanup_free_ char *file1 = NULL, *file2 = NULL, *link1 = NULL, *link2 = NULL;
  90         _cleanup_free_ char *dir1 = NULL, *dir1file = NULL, *dirlink1 = NULL, *dirlink1file = NULL;
  91         _cleanup_free_ char *dir2 = NULL, *dir2file = NULL;
  92
  93         assert_se(path_is_mount_point("/", NULL, AT_SYMLINK_FOLLOW) > 0);
  94         assert_se(path_is_mount_point("/", NULL, 0) > 0);
  95         assert_se(path_is_mount_point("//", NULL, AT_SYMLINK_FOLLOW) > 0);
  96         assert_se(path_is_mount_point("//", NULL, 0) > 0);
  97
  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         assert_se(path_is_mount_point("/proc/", NULL, AT_SYMLINK_FOLLOW) > 0);
 101         assert_se(path_is_mount_point("/proc/", NULL, 0) > 0);
 102
 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         assert_se(path_is_mount_point("/proc/1/", NULL, AT_SYMLINK_FOLLOW) == 0);
 106         assert_se(path_is_mount_point("/proc/1/", NULL, 0) == 0);
 107
 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         assert_se(path_is_mount_point("/sys/", NULL, AT_SYMLINK_FOLLOW) > 0);
 111         assert_se(path_is_mount_point("/sys/", NULL, 0) > 0);
 112
 113         /* we'll create a hierarchy of different kinds of dir/file/link
 114          * layouts:
 115          *
 116          * <tmp>/file1, <tmp>/file2
 117          * <tmp>/link1 -> file1, <tmp>/link2 -> file2
 118          * <tmp>/dir1/
 119          * <tmp>/dir1/file
 120          * <tmp>/dirlink1 -> dir1
 121          * <tmp>/dirlink1file -> dirlink1/file
 122          * <tmp>/dir2/
 123          * <tmp>/dir2/file
 124          */
 125
 126         /* file mountpoints */
 127         assert_se(mkdtemp(tmp_dir) != NULL);
 128         file1 = path_join(NULL, tmp_dir, "file1");
 129         assert_se(file1);
 130         file2 = path_join(NULL, tmp_dir, "file2");
 131         assert_se(file2);
 132         fd = open(file1, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC, 0664);
 133         assert_se(fd > 0);
 134         close(fd);
 135         fd = open(file2, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC, 0664);
 136         assert_se(fd > 0);
 137         close(fd);
 138         link1 = path_join(NULL, tmp_dir, "link1");
 139         assert_se(link1);
 140         assert_se(symlink("file1", link1) == 0);
 141         link2 = path_join(NULL, tmp_dir, "link2");
 142         assert_se(link1);
 143         assert_se(symlink("file2", link2) == 0);
 144
 145         assert_se(path_is_mount_point(file1, NULL, AT_SYMLINK_FOLLOW) == 0);
 146         assert_se(path_is_mount_point(file1, NULL, 0) == 0);
 147         assert_se(path_is_mount_point(link1, NULL, AT_SYMLINK_FOLLOW) == 0);
 148         assert_se(path_is_mount_point(link1, NULL, 0) == 0);
 149
 150         /* directory mountpoints */
 151         dir1 = path_join(NULL, tmp_dir, "dir1");
 152         assert_se(dir1);
 153         assert_se(mkdir(dir1, 0755) == 0);
 154         dirlink1 = path_join(NULL, tmp_dir, "dirlink1");
 155         assert_se(dirlink1);
 156         assert_se(symlink("dir1", dirlink1) == 0);
 157         dirlink1file = path_join(NULL, tmp_dir, "dirlink1file");
 158         assert_se(dirlink1file);
 159         assert_se(symlink("dirlink1/file", dirlink1file) == 0);
 160         dir2 = path_join(NULL, tmp_dir, "dir2");
 161         assert_se(dir2);
 162         assert_se(mkdir(dir2, 0755) == 0);
 163
 164         assert_se(path_is_mount_point(dir1, NULL, AT_SYMLINK_FOLLOW) == 0);
 165         assert_se(path_is_mount_point(dir1, NULL, 0) == 0);
 166         assert_se(path_is_mount_point(dirlink1, NULL, AT_SYMLINK_FOLLOW) == 0);
 167         assert_se(path_is_mount_point(dirlink1, NULL, 0) == 0);
 168
 169         /* file in subdirectory mountpoints */
 170         dir1file = path_join(NULL, dir1, "file");
 171         assert_se(dir1file);
 172         fd = open(dir1file, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC, 0664);
 173         assert_se(fd > 0);
 174         close(fd);
 175
 176         assert_se(path_is_mount_point(dir1file, NULL, AT_SYMLINK_FOLLOW) == 0);
 177         assert_se(path_is_mount_point(dir1file, NULL, 0) == 0);
 178         assert_se(path_is_mount_point(dirlink1file, NULL, AT_SYMLINK_FOLLOW) == 0);
 179         assert_se(path_is_mount_point(dirlink1file, NULL, 0) == 0);
 180
 181         /* these tests will only work as root */
 182         if (mount(file1, file2, NULL, MS_BIND, NULL) >= 0) {
 183                 int rf, rt, rdf, rdt, rlf, rlt, rl1f, rl1t;
 184                 const char *file2d;
 185
 186                 /* files */
 187                 /* capture results in vars, to avoid dangling mounts on failure */
 188                 log_info("%s: %s", __func__, file2);
 189                 rf = path_is_mount_point(file2, NULL, 0);
 190                 rt = path_is_mount_point(file2, NULL, AT_SYMLINK_FOLLOW);
 191
 192                 file2d = strjoina(file2, "/");
 193                 log_info("%s: %s", __func__, file2d);
 194                 rdf = path_is_mount_point(file2d, NULL, 0);
 195                 rdt = path_is_mount_point(file2d, NULL, AT_SYMLINK_FOLLOW);
 196
 197                 log_info("%s: %s", __func__, link2);
 198                 rlf = path_is_mount_point(link2, NULL, 0);
 199                 rlt = path_is_mount_point(link2, NULL, AT_SYMLINK_FOLLOW);
 200
 201                 assert_se(umount(file2) == 0);
 202
 203                 assert_se(rf == 1);
 204                 assert_se(rt == 1);
 205                 assert_se(rdf == -ENOTDIR);
 206                 assert_se(rdt == -ENOTDIR);
 207                 assert_se(rlf == 0);
 208                 assert_se(rlt == 1);
 209
 210                 /* dirs */
 211                 dir2file = path_join(NULL, dir2, "file");
 212                 assert_se(dir2file);
 213                 fd = open(dir2file, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC, 0664);
 214                 assert_se(fd > 0);
 215                 close(fd);
 216
 217                 assert_se(mount(dir2, dir1, NULL, MS_BIND, NULL) >= 0);
 218
 219                 log_info("%s: %s", __func__, dir1);
 220                 rf = path_is_mount_point(dir1, NULL, 0);
 221                 rt = path_is_mount_point(dir1, NULL, AT_SYMLINK_FOLLOW);
 222                 log_info("%s: %s", __func__, dirlink1);
 223                 rlf = path_is_mount_point(dirlink1, NULL, 0);
 224                 rlt = path_is_mount_point(dirlink1, NULL, AT_SYMLINK_FOLLOW);
 225                 log_info("%s: %s", __func__, dirlink1file);
 226                 /* its parent is a mount point, but not /file itself */
 227                 rl1f = path_is_mount_point(dirlink1file, NULL, 0);
 228                 rl1t = path_is_mount_point(dirlink1file, NULL, AT_SYMLINK_FOLLOW);
 229
 230                 assert_se(umount(dir1) == 0);
 231
 232                 assert_se(rf == 1);
 233                 assert_se(rt == 1);
 234                 assert_se(rlf == 0);
 235                 assert_se(rlt == 1);
 236                 assert_se(rl1f == 0);
 237                 assert_se(rl1t == 0);
 238
 239         } else
 240                 printf("Skipping bind mount file test: %m\n");
 241
 242         assert_se(rm_rf(tmp_dir, REMOVE_ROOT|REMOVE_PHYSICAL) == 0);
 243 }
 244
 245 static void test_mount_option_mangle(void) {
 246         char *opts = NULL;
 247         unsigned long f;
 248
 249         assert_se(mount_option_mangle(NULL, MS_RDONLY|MS_NOSUID, &f, &opts) == 0);
 250         assert_se(f == (MS_RDONLY|MS_NOSUID));
 251         assert_se(opts == NULL);
 252
 253         assert_se(mount_option_mangle("", MS_RDONLY|MS_NOSUID, &f, &opts) == 0);
 254         assert_se(f == (MS_RDONLY|MS_NOSUID));
 255         assert_se(opts == NULL);
 256
 257         assert_se(mount_option_mangle("ro,nosuid,nodev,noexec", 0, &f, &opts) == 0);
 258         assert_se(f == (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC));
 259         assert_se(opts == NULL);
 260
 261         assert_se(mount_option_mangle("ro,nosuid,nodev,noexec,mode=755", 0, &f, &opts) == 0);
 262         assert_se(f == (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC));
 263         assert_se(streq(opts, "mode=755"));
 264         opts = mfree(opts);
 265
 266         assert_se(mount_option_mangle("rw,nosuid,foo,hogehoge,nodev,mode=755", 0, &f, &opts) == 0);
 267         assert_se(f == (MS_NOSUID|MS_NODEV));
 268         assert_se(streq(opts, "foo,hogehoge,mode=755"));
 269         opts = mfree(opts);
 270
 271         assert_se(mount_option_mangle("rw,nosuid,nodev,noexec,relatime,net_cls,net_prio", MS_RDONLY, &f, &opts) == 0);
 272         assert_se(f == (MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_RELATIME));
 273         assert_se(streq(opts, "net_cls,net_prio"));
 274         opts = mfree(opts);
 275
 276         assert_se(mount_option_mangle("rw,nosuid,nodev,relatime,size=1630748k,mode=700,uid=1000,gid=1000", MS_RDONLY, &f, &opts) == 0);
 277         assert_se(f == (MS_NOSUID|MS_NODEV|MS_RELATIME));
 278         assert_se(streq(opts, "size=1630748k,mode=700,uid=1000,gid=1000"));
 279         opts = mfree(opts);
 280
 281         assert_se(mount_option_mangle("size=1630748k,rw,gid=1000,,,nodev,relatime,,mode=700,nosuid,uid=1000", MS_RDONLY, &f, &opts) == 0);
 282         assert_se(f == (MS_NOSUID|MS_NODEV|MS_RELATIME));
 283         assert_se(streq(opts, "size=1630748k,gid=1000,mode=700,uid=1000"));
 284         opts = mfree(opts);
 285
 286         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);
 287         assert_se(f == (MS_NOSUID|MS_NODEV));
 288         assert_se(streq(opts, "size=8143984k,nr_inodes=2035996,mode=755"));
 289         opts = mfree(opts);
 290
 291         assert_se(mount_option_mangle("rw,relatime,fmask=0022,,,dmask=0022", MS_RDONLY, &f, &opts) == 0);
 292         assert_se(f == MS_RELATIME);
 293         assert_se(streq(opts, "fmask=0022,dmask=0022"));
 294         opts = mfree(opts);
 295
 296         assert_se(mount_option_mangle("rw,relatime,fmask=0022,dmask=0022,\"hogehoge", MS_RDONLY, &f, &opts) < 0);
 297 }
 298
 299 int main(int argc, char *argv[]) {
 300
 301         log_set_max_level(LOG_DEBUG);
 302
 303         test_mount_propagation_flags("shared", 0, MS_SHARED);
 304         test_mount_propagation_flags("slave", 0, MS_SLAVE);
 305         test_mount_propagation_flags("private", 0, MS_PRIVATE);
 306         test_mount_propagation_flags(NULL, 0, 0);
 307         test_mount_propagation_flags("", 0, 0);
 308         test_mount_propagation_flags("xxxx", -EINVAL, 0);
 309         test_mount_propagation_flags(" ", -EINVAL, 0);
 310
 311         test_mnt_id();
 312         test_path_is_mount_point();
 313         test_mount_option_mangle();
 314
 315         return 0;
 316 }