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selftests: add tests for using detached mount with overlayfs
Test that it is possible to use detached mounts as overlayfs layers. Link: https://lore.kernel.org/r/20250123-erstbesteigung-angeeignet-1d30e64b7df2@brauner Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner
parent
db04662e2f
commit
ccc829b15d
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@ -20,12 +20,16 @@ FIXTURE(set_layers_via_fds) {
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FIXTURE_SETUP(set_layers_via_fds)
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{
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ASSERT_EQ(mkdir("/set_layers_via_fds", 0755), 0);
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ASSERT_EQ(mkdir("/set_layers_via_fds_tmpfs", 0755), 0);
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}
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FIXTURE_TEARDOWN(set_layers_via_fds)
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{
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umount2("/set_layers_via_fds", 0);
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ASSERT_EQ(rmdir("/set_layers_via_fds"), 0);
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umount2("/set_layers_via_fds_tmpfs", 0);
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ASSERT_EQ(rmdir("/set_layers_via_fds_tmpfs"), 0);
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}
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TEST_F(set_layers_via_fds, set_layers_via_fds)
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@ -279,4 +283,130 @@ TEST_F(set_layers_via_fds, set_500_layers_via_opath_fds)
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ASSERT_EQ(close(fd_overlay), 0);
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}
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TEST_F(set_layers_via_fds, set_layers_via_detached_mount_fds)
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{
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int fd_context, fd_tmpfs, fd_overlay, fd_tmp;
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int layer_fds[] = { [0 ... 8] = -EBADF };
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bool layers_found[] = { [0 ... 8] = false };
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size_t len = 0;
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char *line = NULL;
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FILE *f_mountinfo;
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ASSERT_EQ(unshare(CLONE_NEWNS), 0);
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ASSERT_EQ(sys_mount(NULL, "/", NULL, MS_SLAVE | MS_REC, NULL), 0);
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fd_context = sys_fsopen("tmpfs", 0);
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ASSERT_GE(fd_context, 0);
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ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_CMD_CREATE, NULL, NULL, 0), 0);
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fd_tmpfs = sys_fsmount(fd_context, 0, 0);
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ASSERT_GE(fd_tmpfs, 0);
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ASSERT_EQ(close(fd_context), 0);
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ASSERT_EQ(mkdirat(fd_tmpfs, "u", 0755), 0);
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ASSERT_EQ(mkdirat(fd_tmpfs, "u/upper", 0755), 0);
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ASSERT_EQ(mkdirat(fd_tmpfs, "u/work", 0755), 0);
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ASSERT_EQ(mkdirat(fd_tmpfs, "l1", 0755), 0);
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ASSERT_EQ(mkdirat(fd_tmpfs, "l2", 0755), 0);
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ASSERT_EQ(mkdirat(fd_tmpfs, "l3", 0755), 0);
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ASSERT_EQ(mkdirat(fd_tmpfs, "l4", 0755), 0);
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ASSERT_EQ(mkdirat(fd_tmpfs, "d1", 0755), 0);
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ASSERT_EQ(mkdirat(fd_tmpfs, "d2", 0755), 0);
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ASSERT_EQ(mkdirat(fd_tmpfs, "d3", 0755), 0);
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ASSERT_EQ(sys_move_mount(fd_tmpfs, "", -EBADF, "/set_layers_via_fds_tmpfs", MOVE_MOUNT_F_EMPTY_PATH), 0);
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fd_tmp = open_tree(fd_tmpfs, "u", OPEN_TREE_CLONE | OPEN_TREE_CLOEXEC);
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ASSERT_GE(fd_tmp, 0);
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layer_fds[0] = openat(fd_tmp, "upper", O_CLOEXEC | O_DIRECTORY | O_PATH);
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ASSERT_GE(layer_fds[0], 0);
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layer_fds[1] = openat(fd_tmp, "work", O_CLOEXEC | O_DIRECTORY | O_PATH);
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ASSERT_GE(layer_fds[1], 0);
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layer_fds[2] = open_tree(fd_tmpfs, "l1", OPEN_TREE_CLONE | OPEN_TREE_CLOEXEC);
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ASSERT_GE(layer_fds[2], 0);
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layer_fds[3] = open_tree(fd_tmpfs, "l2", OPEN_TREE_CLONE | OPEN_TREE_CLOEXEC);
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ASSERT_GE(layer_fds[3], 0);
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layer_fds[4] = open_tree(fd_tmpfs, "l3", OPEN_TREE_CLONE | OPEN_TREE_CLOEXEC);
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ASSERT_GE(layer_fds[4], 0);
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layer_fds[5] = open_tree(fd_tmpfs, "l4", OPEN_TREE_CLONE | OPEN_TREE_CLOEXEC);
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ASSERT_GE(layer_fds[5], 0);
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layer_fds[6] = open_tree(fd_tmpfs, "d1", OPEN_TREE_CLONE | OPEN_TREE_CLOEXEC);
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ASSERT_GE(layer_fds[6], 0);
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layer_fds[7] = open_tree(fd_tmpfs, "d2", OPEN_TREE_CLONE | OPEN_TREE_CLOEXEC);
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ASSERT_GE(layer_fds[7], 0);
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layer_fds[8] = open_tree(fd_tmpfs, "d3", OPEN_TREE_CLONE | OPEN_TREE_CLOEXEC);
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ASSERT_GE(layer_fds[8], 0);
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ASSERT_EQ(close(fd_tmpfs), 0);
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fd_context = sys_fsopen("overlay", 0);
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ASSERT_GE(fd_context, 0);
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ASSERT_NE(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "lowerdir", NULL, layer_fds[2]), 0);
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ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "upperdir", NULL, layer_fds[0]), 0);
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ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "workdir", NULL, layer_fds[1]), 0);
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ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "lowerdir+", NULL, layer_fds[2]), 0);
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ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "lowerdir+", NULL, layer_fds[3]), 0);
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ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "lowerdir+", NULL, layer_fds[4]), 0);
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ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "lowerdir+", NULL, layer_fds[5]), 0);
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ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "datadir+", NULL, layer_fds[6]), 0);
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ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "datadir+", NULL, layer_fds[7]), 0);
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ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "datadir+", NULL, layer_fds[8]), 0);
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ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_STRING, "metacopy", "on", 0), 0);
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ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_CMD_CREATE, NULL, NULL, 0), 0);
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fd_overlay = sys_fsmount(fd_context, 0, 0);
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ASSERT_GE(fd_overlay, 0);
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ASSERT_EQ(sys_move_mount(fd_overlay, "", -EBADF, "/set_layers_via_fds", MOVE_MOUNT_F_EMPTY_PATH), 0);
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f_mountinfo = fopen("/proc/self/mountinfo", "r");
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ASSERT_NE(f_mountinfo, NULL);
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while (getline(&line, &len, f_mountinfo) != -1) {
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char *haystack = line;
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if (strstr(haystack, "workdir=/tmp/w"))
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layers_found[0] = true;
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if (strstr(haystack, "upperdir=/tmp/u"))
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layers_found[1] = true;
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if (strstr(haystack, "lowerdir+=/tmp/l1"))
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layers_found[2] = true;
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if (strstr(haystack, "lowerdir+=/tmp/l2"))
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layers_found[3] = true;
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if (strstr(haystack, "lowerdir+=/tmp/l3"))
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layers_found[4] = true;
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if (strstr(haystack, "lowerdir+=/tmp/l4"))
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layers_found[5] = true;
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if (strstr(haystack, "datadir+=/tmp/d1"))
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layers_found[6] = true;
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if (strstr(haystack, "datadir+=/tmp/d2"))
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layers_found[7] = true;
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if (strstr(haystack, "datadir+=/tmp/d3"))
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layers_found[8] = true;
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}
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free(line);
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for (int i = 0; i < ARRAY_SIZE(layer_fds); i++) {
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ASSERT_EQ(layers_found[i], true);
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ASSERT_EQ(close(layer_fds[i]), 0);
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}
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ASSERT_EQ(close(fd_context), 0);
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ASSERT_EQ(close(fd_overlay), 0);
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ASSERT_EQ(fclose(f_mountinfo), 0);
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}
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TEST_HARNESS_MAIN
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@ -44,4 +44,21 @@ static inline int sys_move_mount(int from_dfd, const char *from_pathname,
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to_pathname, flags);
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}
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#ifndef OPEN_TREE_CLONE
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#define OPEN_TREE_CLONE 1
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#endif
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#ifndef OPEN_TREE_CLOEXEC
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#define OPEN_TREE_CLOEXEC O_CLOEXEC
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#endif
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#ifndef AT_RECURSIVE
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#define AT_RECURSIVE 0x8000
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#endif
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static inline int sys_open_tree(int dfd, const char *filename, unsigned int flags)
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{
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return syscall(__NR_open_tree, dfd, filename, flags);
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}
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#endif
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