src/test/test-mount-util.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2
   3 #include <sys/mount.h>
   4 #include <sys/statvfs.h>
   5
   6 #include "alloc-util.h"
   7 #include "capability-util.h"
   8 #include "fd-util.h"
   9 #include "fileio.h"
  10 #include "fs-util.h"
  11 #include "missing_mount.h"
  12 #include "mkdir.h"
  13 #include "mount-util.h"
  14 #include "mountpoint-util.h"
  15 #include "namespace-util.h"
  16 #include "path-util.h"
  17 #include "process-util.h"
  18 #include "rm-rf.h"
  19 #include "string-util.h"
  20 #include "strv.h"
  21 #include "tests.h"
  22 #include "tmpfile-util.h"
  23
  24 TEST(mount_option_mangle) {
  25         char *opts = NULL;
  26         unsigned long f;
  27
  28         assert_se(mount_option_mangle(NULL, MS_RDONLY|MS_NOSUID, &f, &opts) == 0);
  29         assert_se(f == (MS_RDONLY|MS_NOSUID));
  30         assert_se(opts == NULL);
  31
  32         assert_se(mount_option_mangle("", MS_RDONLY|MS_NOSUID, &f, &opts) == 0);
  33         assert_se(f == (MS_RDONLY|MS_NOSUID));
  34         assert_se(opts == NULL);
  35
  36         assert_se(mount_option_mangle("ro,nosuid,nodev,noexec", 0, &f, &opts) == 0);
  37         assert_se(f == (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC));
  38         assert_se(opts == NULL);
  39
  40         assert_se(mount_option_mangle("ro,nosuid,nodev,noexec,mode=0755", 0, &f, &opts) == 0);
  41         assert_se(f == (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC));
  42         assert_se(streq(opts, "mode=0755"));
  43         opts = mfree(opts);
  44
  45         assert_se(mount_option_mangle("rw,nosuid,foo,hogehoge,nodev,mode=0755", 0, &f, &opts) == 0);
  46         assert_se(f == (MS_NOSUID|MS_NODEV));
  47         assert_se(streq(opts, "foo,hogehoge,mode=0755"));
  48         opts = mfree(opts);
  49
  50         assert_se(mount_option_mangle("rw,nosuid,nodev,noexec,relatime,net_cls,net_prio", MS_RDONLY, &f, &opts) == 0);
  51         assert_se(f == (MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_RELATIME));
  52         assert_se(streq(opts, "net_cls,net_prio"));
  53         opts = mfree(opts);
  54
  55         assert_se(mount_option_mangle("rw,nosuid,nodev,relatime,size=1630748k,mode=0700,uid=1000,gid=1000", MS_RDONLY, &f, &opts) == 0);
  56         assert_se(f == (MS_NOSUID|MS_NODEV|MS_RELATIME));
  57         assert_se(streq(opts, "size=1630748k,mode=0700,uid=1000,gid=1000"));
  58         opts = mfree(opts);
  59
  60         assert_se(mount_option_mangle("size=1630748k,rw,gid=1000,,,nodev,relatime,,mode=0700,nosuid,uid=1000", MS_RDONLY, &f, &opts) == 0);
  61         assert_se(f == (MS_NOSUID|MS_NODEV|MS_RELATIME));
  62         assert_se(streq(opts, "size=1630748k,gid=1000,mode=0700,uid=1000"));
  63         opts = mfree(opts);
  64
  65         assert_se(mount_option_mangle("rw,exec,size=8143984k,nr_inodes=2035996,mode=0755", MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV, &f, &opts) == 0);
  66         assert_se(f == (MS_NOSUID|MS_NODEV));
  67         assert_se(streq(opts, "size=8143984k,nr_inodes=2035996,mode=0755"));
  68         opts = mfree(opts);
  69
  70         assert_se(mount_option_mangle("rw,relatime,fmask=0022,,,dmask=0022", MS_RDONLY, &f, &opts) == 0);
  71         assert_se(f == MS_RELATIME);
  72         assert_se(streq(opts, "fmask=0022,dmask=0022"));
  73         opts = mfree(opts);
  74
  75         assert_se(mount_option_mangle("rw,relatime,fmask=0022,dmask=0022,\"hogehoge", MS_RDONLY, &f, &opts) < 0);
  76
  77         assert_se(mount_option_mangle("mode=01777,size=10%,nr_inodes=400k,uid=496107520,gid=496107520,context=\"system_u:object_r:svirt_sandbox_file_t:s0:c0,c1\"", 0, &f, &opts) == 0);
  78         assert_se(f == 0);
  79         assert_se(streq(opts, "mode=01777,size=10%,nr_inodes=400k,uid=496107520,gid=496107520,context=\"system_u:object_r:svirt_sandbox_file_t:s0:c0,c1\""));
  80         opts = mfree(opts);
  81 }
  82
  83 static void test_mount_flags_to_string_one(unsigned long flags, const char *expected) {
  84         _cleanup_free_ char *x = NULL;
  85         int r;
  86
  87         r = mount_flags_to_string(flags, &x);
  88         log_info("flags: %#lX → %d/\"%s\"", flags, r, strnull(x));
  89         assert_se(r >= 0);
  90         assert_se(streq(x, expected));
  91 }
  92
  93 TEST(mount_flags_to_string) {
  94         test_mount_flags_to_string_one(0, "0");
  95         test_mount_flags_to_string_one(MS_RDONLY, "MS_RDONLY");
  96         test_mount_flags_to_string_one(MS_NOSUID, "MS_NOSUID");
  97         test_mount_flags_to_string_one(MS_NODEV, "MS_NODEV");
  98         test_mount_flags_to_string_one(MS_NOEXEC, "MS_NOEXEC");
  99         test_mount_flags_to_string_one(MS_SYNCHRONOUS, "MS_SYNCHRONOUS");
 100         test_mount_flags_to_string_one(MS_REMOUNT, "MS_REMOUNT");
 101         test_mount_flags_to_string_one(MS_MANDLOCK, "MS_MANDLOCK");
 102         test_mount_flags_to_string_one(MS_DIRSYNC, "MS_DIRSYNC");
 103         test_mount_flags_to_string_one(MS_NOSYMFOLLOW, "MS_NOSYMFOLLOW");
 104         test_mount_flags_to_string_one(MS_NOATIME, "MS_NOATIME");
 105         test_mount_flags_to_string_one(MS_NODIRATIME, "MS_NODIRATIME");
 106         test_mount_flags_to_string_one(MS_BIND, "MS_BIND");
 107         test_mount_flags_to_string_one(MS_MOVE, "MS_MOVE");
 108         test_mount_flags_to_string_one(MS_REC, "MS_REC");
 109         test_mount_flags_to_string_one(MS_SILENT, "MS_SILENT");
 110         test_mount_flags_to_string_one(MS_POSIXACL, "MS_POSIXACL");
 111         test_mount_flags_to_string_one(MS_UNBINDABLE, "MS_UNBINDABLE");
 112         test_mount_flags_to_string_one(MS_PRIVATE, "MS_PRIVATE");
 113         test_mount_flags_to_string_one(MS_SLAVE, "MS_SLAVE");
 114         test_mount_flags_to_string_one(MS_SHARED, "MS_SHARED");
 115         test_mount_flags_to_string_one(MS_RELATIME, "MS_RELATIME");
 116         test_mount_flags_to_string_one(MS_KERNMOUNT, "MS_KERNMOUNT");
 117         test_mount_flags_to_string_one(MS_I_VERSION, "MS_I_VERSION");
 118         test_mount_flags_to_string_one(MS_STRICTATIME, "MS_STRICTATIME");
 119         test_mount_flags_to_string_one(MS_LAZYTIME, "MS_LAZYTIME");
 120         test_mount_flags_to_string_one(MS_LAZYTIME|MS_STRICTATIME, "MS_STRICTATIME|MS_LAZYTIME");
 121         test_mount_flags_to_string_one(UINT_MAX,
 122                                        "MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS|MS_REMOUNT|"
 123                                        "MS_MANDLOCK|MS_DIRSYNC|MS_NOSYMFOLLOW|MS_NOATIME|MS_NODIRATIME|"
 124                                        "MS_BIND|MS_MOVE|MS_REC|MS_SILENT|MS_POSIXACL|MS_UNBINDABLE|"
 125                                        "MS_PRIVATE|MS_SLAVE|MS_SHARED|MS_RELATIME|MS_KERNMOUNT|"
 126                                        "MS_I_VERSION|MS_STRICTATIME|MS_LAZYTIME|fc000200");
 127 }
 128
 129 TEST(bind_remount_recursive) {
 130         _cleanup_(rm_rf_physical_and_freep) char *tmp = NULL;
 131         _cleanup_free_ char *subdir = NULL;
 132
 133         if (geteuid() != 0 || have_effective_cap(CAP_SYS_ADMIN) <= 0) {
 134                 (void) log_tests_skipped("not running privileged");
 135                 return;
 136         }
 137
 138         assert_se(mkdtemp_malloc("/tmp/XXXXXX", &tmp) >= 0);
 139         subdir = path_join(tmp, "subdir");
 140         assert_se(subdir);
 141         assert_se(mkdir(subdir, 0755) >= 0);
 142
 143         FOREACH_STRING(p, "/usr", "/sys", "/", tmp) {
 144                 pid_t pid;
 145
 146                 pid = fork();
 147                 assert_se(pid >= 0);
 148
 149                 if (pid == 0) {
 150                         struct statvfs svfs;
 151                         /* child */
 152                         assert_se(detach_mount_namespace() >= 0);
 153
 154                         /* Check that the subdir is writable (it must be because it's in /tmp) */
 155                         assert_se(statvfs(subdir, &svfs) >= 0);
 156                         assert_se(!FLAGS_SET(svfs.f_flag, ST_RDONLY));
 157
 158                         /* Make the subdir a bind mount */
 159                         assert_se(mount_nofollow(subdir, subdir, NULL, MS_BIND|MS_REC, NULL) >= 0);
 160
 161                         /* Ensure it's still writable */
 162                         assert_se(statvfs(subdir, &svfs) >= 0);
 163                         assert_se(!FLAGS_SET(svfs.f_flag, ST_RDONLY));
 164
 165                         /* Now mark the path we currently run for read-only */
 166                         assert_se(bind_remount_recursive(p, MS_RDONLY, MS_RDONLY, path_equal(p, "/sys") ? STRV_MAKE("/sys/kernel") : NULL) >= 0);
 167
 168                         /* Ensure that this worked on the top-level */
 169                         assert_se(statvfs(p, &svfs) >= 0);
 170                         assert_se(FLAGS_SET(svfs.f_flag, ST_RDONLY));
 171
 172                         /* And ensure this had an effect on the subdir exactly if we are talking about a path above the subdir */
 173                         assert_se(statvfs(subdir, &svfs) >= 0);
 174                         assert_se(FLAGS_SET(svfs.f_flag, ST_RDONLY) == !!path_startswith(subdir, p));
 175
 176                         _exit(EXIT_SUCCESS);
 177                 }
 178
 179                 assert_se(wait_for_terminate_and_check("test-remount-rec", pid, WAIT_LOG) == EXIT_SUCCESS);
 180         }
 181 }
 182
 183 TEST(bind_remount_one) {
 184         pid_t pid;
 185
 186         if (geteuid() != 0 || have_effective_cap(CAP_SYS_ADMIN) <= 0) {
 187                 (void) log_tests_skipped("not running privileged");
 188                 return;
 189         }
 190
 191         pid = fork();
 192         assert_se(pid >= 0);
 193
 194         if (pid == 0) {
 195                 /* child */
 196
 197                 _cleanup_fclose_ FILE *proc_self_mountinfo = NULL;
 198
 199                 assert_se(detach_mount_namespace() >= 0);
 200
 201                 assert_se(fopen_unlocked("/proc/self/mountinfo", "re", &proc_self_mountinfo) >= 0);
 202
 203                 assert_se(bind_remount_one_with_mountinfo("/run", MS_RDONLY, MS_RDONLY, proc_self_mountinfo) >= 0);
 204                 assert_se(bind_remount_one_with_mountinfo("/run", MS_NOEXEC, MS_RDONLY|MS_NOEXEC, proc_self_mountinfo) >= 0);
 205                 assert_se(bind_remount_one_with_mountinfo("/proc/idontexist", MS_RDONLY, MS_RDONLY, proc_self_mountinfo) == -ENOENT);
 206                 assert_se(bind_remount_one_with_mountinfo("/proc/self", MS_RDONLY, MS_RDONLY, proc_self_mountinfo) == -EINVAL);
 207                 assert_se(bind_remount_one_with_mountinfo("/", MS_RDONLY, MS_RDONLY, proc_self_mountinfo) >= 0);
 208
 209                 _exit(EXIT_SUCCESS);
 210         }
 211
 212         assert_se(wait_for_terminate_and_check("test-remount-one", pid, WAIT_LOG) == EXIT_SUCCESS);
 213 }
 214
 215 TEST(make_mount_point_inode) {
 216         _cleanup_(rm_rf_physical_and_freep) char *d = NULL;
 217         const char *src_file, *src_dir, *dst_file, *dst_dir;
 218         struct stat st;
 219
 220         assert_se(mkdtemp_malloc(NULL, &d) >= 0);
 221
 222         src_file = strjoina(d, "/src/file");
 223         src_dir = strjoina(d, "/src/dir");
 224         dst_file = strjoina(d, "/dst/file");
 225         dst_dir = strjoina(d, "/dst/dir");
 226
 227         assert_se(mkdir_p(src_dir, 0755) >= 0);
 228         assert_se(mkdir_parents(dst_file, 0755) >= 0);
 229         assert_se(touch(src_file) >= 0);
 230
 231         assert_se(make_mount_point_inode_from_path(src_file, dst_file, 0755) >= 0);
 232         assert_se(make_mount_point_inode_from_path(src_dir, dst_dir, 0755) >= 0);
 233
 234         assert_se(stat(dst_dir, &st) == 0);
 235         assert_se(S_ISDIR(st.st_mode));
 236         assert_se(stat(dst_file, &st) == 0);
 237         assert_se(S_ISREG(st.st_mode));
 238         assert_se(!(S_IXUSR & st.st_mode));
 239         assert_se(!(S_IXGRP & st.st_mode));
 240         assert_se(!(S_IXOTH & st.st_mode));
 241
 242         assert_se(unlink(dst_file) == 0);
 243         assert_se(rmdir(dst_dir) == 0);
 244
 245         assert_se(stat(src_file, &st) == 0);
 246         assert_se(make_mount_point_inode_from_stat(&st, dst_file, 0755) >= 0);
 247         assert_se(stat(src_dir, &st) == 0);
 248         assert_se(make_mount_point_inode_from_stat(&st, dst_dir, 0755) >= 0);
 249
 250         assert_se(stat(dst_dir, &st) == 0);
 251         assert_se(S_ISDIR(st.st_mode));
 252         assert_se(stat(dst_file, &st) == 0);
 253         assert_se(S_ISREG(st.st_mode));
 254         assert_se(!(S_IXUSR & st.st_mode));
 255         assert_se(!(S_IXGRP & st.st_mode));
 256         assert_se(!(S_IXOTH & st.st_mode));
 257 }
 258
 259 DEFINE_TEST_MAIN(LOG_DEBUG);