#include <sys/xattr.h>
#include <unistd.h>
+#ifdef HAVE_LINUX_BTRFS_H
+#include <linux/btrfs.h>
+#endif
+
+#ifdef HAVE_LINUX_BTRFS_TREE_H
+#include <linux/btrfs_tree.h>
+#endif
+
#ifdef HAVE_SYS_CAPABILITY_H
#include <sys/capability.h>
#endif
/* path of the test device */
const char *t_device;
+/* path of the test scratch device */
+const char *t_device_scratch;
+
/* mountpoint of the test device */
const char *t_mountpoint;
+/* mountpoint of the test device */
+const char *t_mountpoint_scratch;
+
/* fd for @t_mountpoint */
int t_mnt_fd;
+/* fd for @t_mountpoint_scratch */
+int t_mnt_scratch_fd;
+
/* fd for @T_DIR1 */
int t_dir1_fd;
return fret;
}
-static void usage(void)
-{
- fprintf(stderr, "Description:\n");
- fprintf(stderr, " Run idmapped mount tests\n\n");
+#ifndef HAVE_STRUCT_BTRFS_IOCTL_VOL_ARGS
- fprintf(stderr, "Arguments:\n");
- fprintf(stderr, "--device Device used in the tests\n");
- fprintf(stderr, "--fstype Filesystem type used in the tests\n");
- fprintf(stderr, "--help Print help\n");
- fprintf(stderr, "--mountpoint Mountpoint of device\n");
- fprintf(stderr, "--supported Test whether idmapped mounts are supported on this filesystem\n");
- fprintf(stderr, "--test-core Run core idmapped mount testsuite\n");
- fprintf(stderr, "--test-fscaps-regression Run fscap regression tests\n");
- fprintf(stderr, "--test-nested-userns Run nested userns idmapped mount testsuite\n");
+#ifndef BTRFS_PATH_NAME_MAX
+#define BTRFS_PATH_NAME_MAX 4087
+#endif
- _exit(EXIT_SUCCESS);
-}
+struct btrfs_ioctl_vol_args {
+ __s64 fd;
+ char name[BTRFS_PATH_NAME_MAX + 1];
+};
+#endif
-static const struct option longopts[] = {
- {"device", required_argument, 0, 'd'},
- {"fstype", required_argument, 0, 'f'},
- {"mountpoint", required_argument, 0, 'm'},
- {"supported", no_argument, 0, 's'},
- {"help", no_argument, 0, 'h'},
- {"test-core", no_argument, 0, 'c'},
- {"test-fscaps-regression", no_argument, 0, 'g'},
- {"test-nested-userns", no_argument, 0, 'n'},
- {NULL, 0, 0, 0},
+#ifndef HAVE_STRUCT_BTRFS_QGROUP_LIMIT
+struct btrfs_qgroup_limit {
+ __u64 flags;
+ __u64 max_rfer;
+ __u64 max_excl;
+ __u64 rsv_rfer;
+ __u64 rsv_excl;
};
+#endif
-struct t_idmapped_mounts {
- int (*test)(void);
- const char *description;
-} basic_suite[] = {
- { acls, "posix acls on regular mounts", },
- { create_in_userns, "create operations in user namespace", },
- { device_node_in_userns, "device node in user namespace", },
- { expected_uid_gid_idmapped_mounts, "expected ownership on idmapped mounts", },
- { fscaps, "fscaps on regular mounts", },
- { fscaps_idmapped_mounts, "fscaps on idmapped mounts", },
- { fscaps_idmapped_mounts_in_userns, "fscaps on idmapped mounts in user namespace", },
- { fscaps_idmapped_mounts_in_userns_separate_userns, "fscaps on idmapped mounts in user namespace with different id mappings", },
- { fsids_mapped, "mapped fsids", },
- { fsids_unmapped, "unmapped fsids", },
- { hardlink_crossing_mounts, "cross mount hardlink", },
- { hardlink_crossing_idmapped_mounts, "cross idmapped mount hardlink", },
- { hardlink_from_idmapped_mount, "hardlinks from idmapped mounts", },
- { hardlink_from_idmapped_mount_in_userns, "hardlinks from idmapped mounts in user namespace", },
-#ifdef HAVE_LIBURING_H
- { io_uring, "io_uring", },
- { io_uring_userns, "io_uring in user namespace", },
- { io_uring_idmapped, "io_uring from idmapped mounts", },
- { io_uring_idmapped_userns, "io_uring from idmapped mounts in user namespace", },
- { io_uring_idmapped_unmapped, "io_uring from idmapped mounts with unmapped ids", },
- { io_uring_idmapped_unmapped_userns, "io_uring from idmapped mounts with unmapped ids in user namespace", },
+#ifndef HAVE_STRUCT_BTRFS_QGROUP_INHERIT
+struct btrfs_qgroup_inherit {
+ __u64 flags;
+ __u64 num_qgroups;
+ __u64 num_ref_copies;
+ __u64 num_excl_copies;
+ struct btrfs_qgroup_limit lim;
+ __u64 qgroups[0];
+};
#endif
- { protected_symlinks, "following protected symlinks on regular mounts", },
- { protected_symlinks_idmapped_mounts, "following protected symlinks on idmapped mounts", },
- { protected_symlinks_idmapped_mounts_in_userns, "following protected symlinks on idmapped mounts in user namespace", },
- { rename_crossing_mounts, "cross mount rename", },
- { rename_crossing_idmapped_mounts, "cross idmapped mount rename", },
- { rename_from_idmapped_mount, "rename from idmapped mounts", },
- { rename_from_idmapped_mount_in_userns, "rename from idmapped mounts in user namespace", },
- { setattr_truncate, "setattr truncate", },
- { setattr_truncate_idmapped, "setattr truncate on idmapped mounts", },
- { setattr_truncate_idmapped_in_userns, "setattr truncate on idmapped mounts in user namespace", },
- { setgid_create, "create operations in directories with setgid bit set", },
- { setgid_create_idmapped, "create operations in directories with setgid bit set on idmapped mounts", },
- { setgid_create_idmapped_in_userns, "create operations in directories with setgid bit set on idmapped mounts in user namespace", },
- { setid_binaries, "setid binaries on regular mounts", },
- { setid_binaries_idmapped_mounts, "setid binaries on idmapped mounts", },
- { setid_binaries_idmapped_mounts_in_userns, "setid binaries on idmapped mounts in user namespace", },
- { setid_binaries_idmapped_mounts_in_userns_separate_userns, "setid binaries on idmapped mounts in user namespace with different id mappings", },
- { sticky_bit_unlink, "sticky bit unlink operations on regular mounts", },
- { sticky_bit_unlink_idmapped_mounts, "sticky bit unlink operations on idmapped mounts", },
- { sticky_bit_unlink_idmapped_mounts_in_userns, "sticky bit unlink operations on idmapped mounts in user namespace", },
- { sticky_bit_rename, "sticky bit rename operations on regular mounts", },
- { sticky_bit_rename_idmapped_mounts, "sticky bit rename operations on idmapped mounts", },
- { sticky_bit_rename_idmapped_mounts_in_userns, "sticky bit rename operations on idmapped mounts in user namespace", },
- { symlink_regular_mounts, "symlink from regular mounts", },
- { symlink_idmapped_mounts, "symlink from idmapped mounts", },
- { symlink_idmapped_mounts_in_userns, "symlink from idmapped mounts in user namespace", },
- { threaded_idmapped_mount_interactions, "threaded operations on idmapped mounts", },
+
+#ifndef HAVE_STRUCT_BTRFS_IOCTL_VOL_ARGS_V2
+
+#ifndef BTRFS_SUBVOL_NAME_MAX
+#define BTRFS_SUBVOL_NAME_MAX 4039
+#endif
+
+struct btrfs_ioctl_vol_args_v2 {
+ __s64 fd;
+ __u64 transid;
+ __u64 flags;
+ union {
+ struct {
+ __u64 size;
+ struct btrfs_qgroup_inherit *qgroup_inherit;
+ };
+ __u64 unused[4];
+ };
+ union {
+ char name[BTRFS_SUBVOL_NAME_MAX + 1];
+ __u64 devid;
+ __u64 subvolid;
+ };
};
+#endif
-struct t_idmapped_mounts fscaps_in_ancestor_userns[] = {
- { fscaps_idmapped_mounts_in_userns_valid_in_ancestor_userns, "fscaps on idmapped mounts in user namespace writing fscap valid in ancestor userns", },
+#ifndef HAVE_STRUCT_BTRFS_IOCTL_INO_LOOKUP_ARGS
+
+#ifndef BTRFS_INO_LOOKUP_PATH_MAX
+#define BTRFS_INO_LOOKUP_PATH_MAX 4080
+#endif
+struct btrfs_ioctl_ino_lookup_args {
+ __u64 treeid;
+ __u64 objectid;
+ char name[BTRFS_INO_LOOKUP_PATH_MAX];
};
+#endif
-struct t_idmapped_mounts t_nested_userns[] = {
- { nested_userns, "test that nested user namespaces behave correctly when attached to idmapped mounts", },
+#ifndef HAVE_STRUCT_BTRFS_IOCTL_INO_LOOKUP_USER_ARGS
+
+#ifndef BTRFS_VOL_NAME_MAX
+#define BTRFS_VOL_NAME_MAX 255
+#endif
+
+#ifndef BTRFS_INO_LOOKUP_USER_PATH_MAX
+#define BTRFS_INO_LOOKUP_USER_PATH_MAX (4080 - BTRFS_VOL_NAME_MAX - 1)
+#endif
+
+struct btrfs_ioctl_ino_lookup_user_args {
+ __u64 dirid;
+ __u64 treeid;
+ char name[BTRFS_VOL_NAME_MAX + 1];
+ char path[BTRFS_INO_LOOKUP_USER_PATH_MAX];
};
+#endif
-static bool run_test(struct t_idmapped_mounts suite[], size_t suite_size)
-{
- int i;
+#ifndef HAVE_STRUCT_BTRFS_IOCTL_GET_SUBVOL_ROOTREF_ARGS
- for (i = 0; i < suite_size; i++) {
- struct t_idmapped_mounts *t = &suite[i];
- int ret;
- pid_t pid;
+#ifndef BTRFS_MAX_ROOTREF_BUFFER_NUM
+#define BTRFS_MAX_ROOTREF_BUFFER_NUM 255
+#endif
- test_setup();
+struct btrfs_ioctl_get_subvol_rootref_args {
+ __u64 min_treeid;
+ struct {
+ __u64 treeid;
+ __u64 dirid;
+ } rootref[BTRFS_MAX_ROOTREF_BUFFER_NUM];
+ __u8 num_items;
+ __u8 align[7];
+};
+#endif
- pid = fork();
- if (pid < 0)
- return false;
+#ifndef BTRFS_IOCTL_MAGIC
+#define BTRFS_IOCTL_MAGIC 0x94
+#endif
- if (pid == 0) {
- ret = t->test();
- if (ret)
- die("failure: %s", t->description);
+#ifndef BTRFS_IOC_SNAP_DESTROY
+#define BTRFS_IOC_SNAP_DESTROY \
+ _IOW(BTRFS_IOCTL_MAGIC, 15, struct btrfs_ioctl_vol_args)
+#endif
- exit(EXIT_SUCCESS);
- }
+#ifndef BTRFS_IOC_SNAP_DESTROY_V2
+#define BTRFS_IOC_SNAP_DESTROY_V2 \
+ _IOW(BTRFS_IOCTL_MAGIC, 63, struct btrfs_ioctl_vol_args_v2)
+#endif
- ret = wait_for_pid(pid);
- test_cleanup();
+#ifndef BTRFS_IOC_SNAP_CREATE_V2
+#define BTRFS_IOC_SNAP_CREATE_V2 \
+ _IOW(BTRFS_IOCTL_MAGIC, 23, struct btrfs_ioctl_vol_args_v2)
+#endif
- if (ret)
- return false;
- }
+#ifndef BTRFS_IOC_SUBVOL_CREATE_V2
+#define BTRFS_IOC_SUBVOL_CREATE_V2 \
+ _IOW(BTRFS_IOCTL_MAGIC, 24, struct btrfs_ioctl_vol_args_v2)
+#endif
- return true;
-}
+#ifndef BTRFS_IOC_SUBVOL_GETFLAGS
+#define BTRFS_IOC_SUBVOL_GETFLAGS _IOR(BTRFS_IOCTL_MAGIC, 25, __u64)
+#endif
-int main(int argc, char *argv[])
-{
- int fret, ret;
- int index = 0;
- bool supported = false, test_core = false,
- test_fscaps_regression = false, test_nested_userns = false;
+#ifndef BTRFS_IOC_SUBVOL_SETFLAGS
+#define BTRFS_IOC_SUBVOL_SETFLAGS _IOW(BTRFS_IOCTL_MAGIC, 26, __u64)
+#endif
- while ((ret = getopt_long_only(argc, argv, "", longopts, &index)) != -1) {
- switch (ret) {
- case 'd':
- t_device = optarg;
- break;
- case 'f':
- t_fstype = optarg;
- break;
- case 'm':
- t_mountpoint = optarg;
- break;
- case 's':
- supported = true;
- break;
- case 'c':
- test_core = true;
- break;
- case 'g':
- test_fscaps_regression = true;
- break;
- case 'n':
- test_nested_userns = true;
- break;
- case 'h':
- /* fallthrough */
- default:
- usage();
- }
- }
+#ifndef BTRFS_IOC_INO_LOOKUP
+#define BTRFS_IOC_INO_LOOKUP \
+ _IOWR(BTRFS_IOCTL_MAGIC, 18, struct btrfs_ioctl_ino_lookup_args)
+#endif
- if (!t_device)
- die_errno(EINVAL, "test device missing");
+#ifndef BTRFS_IOC_INO_LOOKUP_USER
+#define BTRFS_IOC_INO_LOOKUP_USER \
+ _IOWR(BTRFS_IOCTL_MAGIC, 62, struct btrfs_ioctl_ino_lookup_user_args)
+#endif
- if (!t_fstype)
- die_errno(EINVAL, "test filesystem type missing");
+#ifndef BTRFS_IOC_GET_SUBVOL_ROOTREF
+#define BTRFS_IOC_GET_SUBVOL_ROOTREF \
+ _IOWR(BTRFS_IOCTL_MAGIC, 61, struct btrfs_ioctl_get_subvol_rootref_args)
+#endif
- if (!t_mountpoint)
- die_errno(EINVAL, "mountpoint of test device missing");
+#ifndef BTRFS_SUBVOL_RDONLY
+#define BTRFS_SUBVOL_RDONLY (1ULL << 1)
+#endif
- /* create separate mount namespace */
- if (unshare(CLONE_NEWNS))
- die("failure: create new mount namespace");
+#ifndef BTRFS_SUBVOL_SPEC_BY_ID
+#define BTRFS_SUBVOL_SPEC_BY_ID (1ULL << 4)
+#endif
- /* turn off mount propagation */
- if (sys_mount(NULL, "/", NULL, MS_REC | MS_PRIVATE, 0))
- die("failure: turn mount propagation off");
+#ifndef BTRFS_FIRST_FREE_OBJECTID
+#define BTRFS_FIRST_FREE_OBJECTID 256ULL
+#endif
- t_mnt_fd = openat(-EBADF, t_mountpoint, O_CLOEXEC | O_DIRECTORY);
- if (t_mnt_fd < 0)
- die("failed to open %s", t_mountpoint);
+static int btrfs_delete_subvolume(int parent_fd, const char *name)
+{
+ struct btrfs_ioctl_vol_args args = {};
+ size_t len;
+ int ret;
- /*
- * Caller just wants to know whether the filesystem we're on supports
- * idmapped mounts.
- */
- if (supported) {
- int open_tree_fd = -EBADF;
- struct mount_attr attr = {
- .attr_set = MOUNT_ATTR_IDMAP,
- .userns_fd = -EBADF,
- };
+ len = strlen(name);
+ if (len >= sizeof(args.name))
+ return -ENAMETOOLONG;
- /* Changing mount properties on a detached mount. */
- attr.userns_fd = get_userns_fd(0, 1000, 1);
- if (attr.userns_fd < 0)
- exit(EXIT_FAILURE);
+ memcpy(args.name, name, len);
+ args.name[len] = '\0';
- open_tree_fd = sys_open_tree(t_mnt_fd, "",
- AT_EMPTY_PATH |
- AT_NO_AUTOMOUNT |
- AT_SYMLINK_NOFOLLOW |
- OPEN_TREE_CLOEXEC |
- OPEN_TREE_CLONE);
- if (open_tree_fd < 0)
- ret = -1;
- else
- ret = sys_mount_setattr(open_tree_fd, "", AT_EMPTY_PATH, &attr, sizeof(attr));
+ ret = ioctl(parent_fd, BTRFS_IOC_SNAP_DESTROY, &args);
+ if (ret < 0)
+ return -1;
- close(open_tree_fd);
- close(attr.userns_fd);
+ return 0;
+}
- if (ret)
- exit(EXIT_FAILURE);
+static int btrfs_delete_subvolume_id(int parent_fd, uint64_t subvolid)
+{
+ struct btrfs_ioctl_vol_args_v2 args = {};
+ int ret;
- exit(EXIT_SUCCESS);
- }
+ args.flags = BTRFS_SUBVOL_SPEC_BY_ID;
+ args.subvolid = subvolid;
- stash_overflowuid();
- stash_overflowgid();
+ ret = ioctl(parent_fd, BTRFS_IOC_SNAP_DESTROY_V2, &args);
+ if (ret < 0)
+ return -1;
- fret = EXIT_FAILURE;
+ return 0;
+}
- if (test_core && !run_test(basic_suite, ARRAY_SIZE(basic_suite)))
- goto out;
+static int btrfs_create_subvolume(int parent_fd, const char *name)
+{
+ struct btrfs_ioctl_vol_args_v2 args = {};
+ size_t len;
+ int ret;
- if (test_fscaps_regression &&
- !run_test(fscaps_in_ancestor_userns,
- ARRAY_SIZE(fscaps_in_ancestor_userns)))
- goto out;
+ len = strlen(name);
+ if (len >= sizeof(args.name))
+ return -ENAMETOOLONG;
- if (test_nested_userns &&
- !run_test(t_nested_userns, ARRAY_SIZE(t_nested_userns)))
+ memcpy(args.name, name, len);
+ args.name[len] = '\0';
+
+ ret = ioctl(parent_fd, BTRFS_IOC_SUBVOL_CREATE_V2, &args);
+ if (ret < 0)
+ return -1;
+
+ return 0;
+}
+
+static int btrfs_create_snapshot(int fd, int parent_fd, const char *name,
+ int flags)
+{
+ struct btrfs_ioctl_vol_args_v2 args = {
+ .fd = fd,
+ };
+ size_t len;
+ int ret;
+
+ if (flags & ~BTRFS_SUBVOL_RDONLY)
+ return -EINVAL;
+
+ len = strlen(name);
+ if (len >= sizeof(args.name))
+ return -ENAMETOOLONG;
+ memcpy(args.name, name, len);
+ args.name[len] = '\0';
+
+ if (flags & BTRFS_SUBVOL_RDONLY)
+ args.flags |= BTRFS_SUBVOL_RDONLY;
+ ret = ioctl(parent_fd, BTRFS_IOC_SNAP_CREATE_V2, &args);
+ if (ret < 0)
+ return -1;
+
+ return 0;
+}
+
+static int btrfs_get_subvolume_ro(int fd, bool *read_only_ret)
+{
+ uint64_t flags;
+ int ret;
+
+ ret = ioctl(fd, BTRFS_IOC_SUBVOL_GETFLAGS, &flags);
+ if (ret < 0)
+ return -1;
+
+ *read_only_ret = flags & BTRFS_SUBVOL_RDONLY;
+ return 0;
+}
+
+static int btrfs_set_subvolume_ro(int fd, bool read_only)
+{
+ uint64_t flags;
+ int ret;
+
+ ret = ioctl(fd, BTRFS_IOC_SUBVOL_GETFLAGS, &flags);
+ if (ret < 0)
+ return -1;
+
+ if (read_only)
+ flags |= BTRFS_SUBVOL_RDONLY;
+ else
+ flags &= ~BTRFS_SUBVOL_RDONLY;
+
+ ret = ioctl(fd, BTRFS_IOC_SUBVOL_SETFLAGS, &flags);
+ if (ret < 0)
+ return -1;
+
+ return 0;
+}
+
+static int btrfs_get_subvolume_id(int fd, uint64_t *id_ret)
+{
+ struct btrfs_ioctl_ino_lookup_args args = {
+ .treeid = 0,
+ .objectid = BTRFS_FIRST_FREE_OBJECTID,
+ };
+ int ret;
+
+ ret = ioctl(fd, BTRFS_IOC_INO_LOOKUP, &args);
+ if (ret < 0)
+ return -1;
+
+ *id_ret = args.treeid;
+
+ return 0;
+}
+
+/*
+ * The following helpers are adapted from the btrfsutils library. We can't use
+ * the library directly since we need full control over how the subvolume
+ * iteration happens. We need to be able to check whether unprivileged
+ * subvolume iteration is possible, i.e. whether BTRFS_IOC_INO_LOOKUP_USER is
+ * available and also ensure that it is actually used when looking up paths.
+ */
+struct btrfs_stack {
+ uint64_t tree_id;
+ struct btrfs_ioctl_get_subvol_rootref_args rootref_args;
+ size_t items_pos;
+ size_t path_len;
+};
+
+struct btrfs_iter {
+ int fd;
+ int cur_fd;
+
+ struct btrfs_stack *search_stack;
+ size_t stack_len;
+ size_t stack_capacity;
+
+ char *cur_path;
+ size_t cur_path_capacity;
+};
+
+static struct btrfs_stack *top_stack_entry(struct btrfs_iter *iter)
+{
+ return &iter->search_stack[iter->stack_len - 1];
+}
+
+static int pop_stack(struct btrfs_iter *iter)
+{
+ struct btrfs_stack *top, *parent;
+ int fd, parent_fd;
+ size_t i;
+
+ if (iter->stack_len == 1) {
+ iter->stack_len--;
+ return 0;
+ }
+
+ top = top_stack_entry(iter);
+ iter->stack_len--;
+ parent = top_stack_entry(iter);
+
+ fd = iter->cur_fd;
+ for (i = parent->path_len; i < top->path_len; i++) {
+ if (i == 0 || iter->cur_path[i] == '/') {
+ parent_fd = openat(fd, "..", O_RDONLY);
+ if (fd != iter->cur_fd)
+ close(fd);
+ if (parent_fd == -1)
+ return -1;
+ fd = parent_fd;
+ }
+ }
+ if (iter->cur_fd != iter->fd)
+ close(iter->cur_fd);
+ iter->cur_fd = fd;
+
+ return 0;
+}
+
+static int append_stack(struct btrfs_iter *iter, uint64_t tree_id, size_t path_len)
+{
+ struct btrfs_stack *entry;
+
+ if (iter->stack_len >= iter->stack_capacity) {
+ size_t new_capacity = iter->stack_capacity * 2;
+ struct btrfs_stack *new_search_stack;
+
+ new_search_stack = reallocarray(iter->search_stack, new_capacity,
+ sizeof(*iter->search_stack));
+ if (!new_search_stack)
+ return -ENOMEM;
+
+ iter->stack_capacity = new_capacity;
+ iter->search_stack = new_search_stack;
+ }
+
+ entry = &iter->search_stack[iter->stack_len];
+
+ memset(entry, 0, sizeof(*entry));
+ entry->path_len = path_len;
+ entry->tree_id = tree_id;
+
+ if (iter->stack_len) {
+ struct btrfs_stack *top;
+ char *path;
+ int fd;
+
+ top = top_stack_entry(iter);
+ path = &iter->cur_path[top->path_len];
+ if (*path == '/')
+ path++;
+ fd = openat(iter->cur_fd, path, O_RDONLY);
+ if (fd == -1)
+ return -errno;
+
+ close(iter->cur_fd);
+ iter->cur_fd = fd;
+ }
+
+ iter->stack_len++;
+
+ return 0;
+}
+
+static int btrfs_iterator_start(int fd, uint64_t top, struct btrfs_iter **ret)
+{
+ struct btrfs_iter *iter;
+ int err;
+
+ iter = malloc(sizeof(*iter));
+ if (!iter)
+ return -ENOMEM;
+
+ iter->fd = fd;
+ iter->cur_fd = fd;
+
+ iter->stack_len = 0;
+ iter->stack_capacity = 4;
+ iter->search_stack = malloc(sizeof(*iter->search_stack) *
+ iter->stack_capacity);
+ if (!iter->search_stack) {
+ err = -ENOMEM;
+ goto out_iter;
+ }
+
+ iter->cur_path_capacity = 256;
+ iter->cur_path = malloc(iter->cur_path_capacity);
+ if (!iter->cur_path) {
+ err = -ENOMEM;
+ goto out_search_stack;
+ }
+
+ err = append_stack(iter, top, 0);
+ if (err)
+ goto out_cur_path;
+
+ *ret = iter;
+
+ return 0;
+
+out_cur_path:
+ free(iter->cur_path);
+out_search_stack:
+ free(iter->search_stack);
+out_iter:
+ free(iter);
+ return err;
+}
+
+static void btrfs_iterator_end(struct btrfs_iter *iter)
+{
+ if (iter) {
+ free(iter->cur_path);
+ free(iter->search_stack);
+ if (iter->cur_fd != iter->fd)
+ close(iter->cur_fd);
+ close(iter->fd);
+ free(iter);
+ }
+}
+
+static int __append_path(struct btrfs_iter *iter, const char *name,
+ size_t name_len, const char *dir, size_t dir_len,
+ size_t *path_len_ret)
+{
+ struct btrfs_stack *top = top_stack_entry(iter);
+ size_t path_len;
+ char *p;
+
+ path_len = top->path_len;
+ /*
+ * We need a joining slash if we have a current path and a subdirectory.
+ */
+ if (top->path_len && dir_len)
+ path_len++;
+ path_len += dir_len;
+ /*
+ * We need another joining slash if we have a current path and a name,
+ * but not if we have a subdirectory, because the lookup ioctl includes
+ * a trailing slash.
+ */
+ if (top->path_len && !dir_len && name_len)
+ path_len++;
+ path_len += name_len;
+
+ /* We need one extra character for the NUL terminator. */
+ if (path_len + 1 > iter->cur_path_capacity) {
+ char *tmp = realloc(iter->cur_path, path_len + 1);
+
+ if (!tmp)
+ return -ENOMEM;
+ iter->cur_path = tmp;
+ iter->cur_path_capacity = path_len + 1;
+ }
+
+ p = iter->cur_path + top->path_len;
+ if (top->path_len && dir_len)
+ *p++ = '/';
+ memcpy(p, dir, dir_len);
+ p += dir_len;
+ if (top->path_len && !dir_len && name_len)
+ *p++ = '/';
+ memcpy(p, name, name_len);
+ p += name_len;
+ *p = '\0';
+
+ *path_len_ret = path_len;
+
+ return 0;
+}
+
+static int get_subvolume_path(struct btrfs_iter *iter, uint64_t treeid,
+ uint64_t dirid, size_t *path_len_ret)
+{
+ struct btrfs_ioctl_ino_lookup_user_args args = {
+ .treeid = treeid,
+ .dirid = dirid,
+ };
+ int ret;
+
+ ret = ioctl(iter->cur_fd, BTRFS_IOC_INO_LOOKUP_USER, &args);
+ if (ret == -1)
+ return -1;
+
+ return __append_path(iter, args.name, strlen(args.name), args.path,
+ strlen(args.path), path_len_ret);
+}
+
+static int btrfs_iterator_next(struct btrfs_iter *iter, char **path_ret,
+ uint64_t *id_ret)
+{
+ struct btrfs_stack *top;
+ uint64_t treeid, dirid;
+ size_t path_len;
+ int ret, err;
+
+ for (;;) {
+ for (;;) {
+ if (iter->stack_len == 0)
+ return 1;
+
+ top = top_stack_entry(iter);
+ if (top->items_pos < top->rootref_args.num_items) {
+ break;
+ } else {
+ ret = ioctl(iter->cur_fd,
+ BTRFS_IOC_GET_SUBVOL_ROOTREF,
+ &top->rootref_args);
+ if (ret == -1 && errno != EOVERFLOW)
+ return -1;
+ top->items_pos = 0;
+
+ if (top->rootref_args.num_items == 0) {
+ err = pop_stack(iter);
+ if (err)
+ return err;
+ }
+ }
+ }
+
+ treeid = top->rootref_args.rootref[top->items_pos].treeid;
+ dirid = top->rootref_args.rootref[top->items_pos].dirid;
+ top->items_pos++;
+ err = get_subvolume_path(iter, treeid, dirid, &path_len);
+ if (err) {
+ /* Skip the subvolume if we can't access it. */
+ if (errno == EACCES)
+ continue;
+ return err;
+ }
+
+ err = append_stack(iter, treeid, path_len);
+ if (err) {
+ /*
+ * Skip the subvolume if it does not exist (which can
+ * happen if there is another filesystem mounted over a
+ * parent directory) or we don't have permission to
+ * access it.
+ */
+ if (errno == ENOENT || errno == EACCES)
+ continue;
+ return err;
+ }
+
+ top = top_stack_entry(iter);
+ goto out;
+ }
+
+out:
+ if (path_ret) {
+ *path_ret = malloc(top->path_len + 1);
+ if (!*path_ret)
+ return -ENOMEM;
+ memcpy(*path_ret, iter->cur_path, top->path_len);
+ (*path_ret)[top->path_len] = '\0';
+ }
+ if (id_ret)
+ *id_ret = top->tree_id;
+ return 0;
+}
+
+#define BTRFS_SUBVOLUME1 "subvol1"
+#define BTRFS_SUBVOLUME1_SNAPSHOT1 "subvol1_snapshot1"
+#define BTRFS_SUBVOLUME1_SNAPSHOT1_RO "subvol1_snapshot1_ro"
+#define BTRFS_SUBVOLUME1_RENAME "subvol1_rename"
+#define BTRFS_SUBVOLUME2 "subvol2"
+
+static int btrfs_subvolumes_fsids_mapped(void)
+{
+ int fret = -1;
+ int open_tree_fd = -EBADF, tree_fd = -EBADF;
+ struct mount_attr attr = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ };
+ pid_t pid;
+
+ if (!caps_supported())
+ return 0;
+
+ /* Changing mount properties on a detached mount. */
+ attr.userns_fd = get_userns_fd(0, 10000, 10000);
+ if (attr.userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ open_tree_fd = sys_open_tree(t_dir1_fd, "",
+ AT_EMPTY_PATH |
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (open_tree_fd < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ if (sys_mount_setattr(open_tree_fd, "", AT_EMPTY_PATH, &attr, sizeof(attr))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ /*
+ * The open_tree() syscall returns an O_PATH file descriptor which we
+ * can't use with ioctl(). So let's reopen it as a proper file
+ * descriptor.
+ */
+ tree_fd = openat(open_tree_fd, ".", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (tree_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ if (!switch_fsids(10000, 10000))
+ die("failure: switch fsids");
+
+ if (!caps_up())
+ die("failure: raise caps");
+
+ /*
+ * The caller's fsids now have mappings in the idmapped mount so
+ * any file creation must succeed.
+ */
+
+ /* create subvolume */
+ if (btrfs_create_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_create_subvolume");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1, 0, 10000, 10000))
+ die("failure: check ownership");
+
+ /* remove subvolume */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_delete_subvolume");
+
+ /* create subvolume */
+ if (btrfs_create_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_create_subvolume");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1, 0, 10000, 10000))
+ die("failure: check ownership");
+
+ if (!caps_down())
+ die("failure: lower caps");
+
+ /*
+ * The filesystem is not mounted with user_subvol_rm_allowed so
+ * subvolume deletion must fail.
+ */
+ if (!btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_delete_subvolume");
+ if (errno != EPERM)
+ die("failure: errno");
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1, 0, 10000, 10000))
+ die("failure: check ownership");
+
+ /* remove subvolume */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1)) {
+ log_stderr("failure: btrfs_delete_subvolume");
+ goto out;
+ }
+
+ fret = 0;
+ log_debug("Ran test");
+out:
+ safe_close(attr.userns_fd);
+ safe_close(open_tree_fd);
+ safe_close(tree_fd);
+
+ return fret;
+}
+
+static int btrfs_subvolumes_fsids_mapped_userns(void)
+{
+ int fret = -1;
+ int open_tree_fd = -EBADF, tree_fd = -EBADF;
+ struct mount_attr attr = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ };
+ pid_t pid;
+
+ if (!caps_supported())
+ return 0;
+
+ /* Changing mount properties on a detached mount. */
+ attr.userns_fd = get_userns_fd(0, 10000, 10000);
+ if (attr.userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ open_tree_fd = sys_open_tree(t_dir1_fd, "",
+ AT_EMPTY_PATH |
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (open_tree_fd < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ if (sys_mount_setattr(open_tree_fd, "", AT_EMPTY_PATH, &attr, sizeof(attr))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ /*
+ * The open_tree() syscall returns an O_PATH file descriptor which we
+ * can't use with ioctl(). So let's reopen it as a proper file
+ * descriptor.
+ */
+ tree_fd = openat(open_tree_fd, ".", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (tree_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ if (!switch_userns(attr.userns_fd, 0, 0, false))
+ die("failure: switch_userns");
+
+ /* The caller's fsids now have mappings in the idmapped mount so
+ * any file creation must fail.
+ */
+
+ /* create subvolume */
+ if (btrfs_create_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_create_subvolume");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1, 0, 0, 0))
+ die("failure: check ownership");
+
+ /* remove subvolume */
+ if (!btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_delete_subvolume");
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ /* remove subvolume */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1)) {
+ log_stderr("failure: btrfs_delete_subvolume");
+ goto out;
+ }
+
+ fret = 0;
+ log_debug("Ran test");
+out:
+ safe_close(attr.userns_fd);
+ safe_close(open_tree_fd);
+ safe_close(tree_fd);
+
+ return fret;
+}
+
+static int btrfs_subvolumes_fsids_unmapped(void)
+{
+ int fret = -1;
+ int open_tree_fd = -EBADF, tree_fd = -EBADF;
+ struct mount_attr attr = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ };
+
+ /* create directory for rename test */
+ if (btrfs_create_subvolume(t_dir1_fd, BTRFS_SUBVOLUME1)) {
+ log_stderr("failure: btrfs_create_subvolume");
+ goto out;
+ }
+
+ /* change ownership of all files to uid 0 */
+ if (fchownat(t_dir1_fd, BTRFS_SUBVOLUME1, 0, 0, 0)) {
+ log_stderr("failure: fchownat");
+ goto out;
+ }
+
+ /* Changing mount properties on a detached mount. */
+ attr.userns_fd = get_userns_fd(0, 10000, 10000);
+ if (attr.userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ open_tree_fd = sys_open_tree(t_dir1_fd, "",
+ AT_EMPTY_PATH |
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (open_tree_fd < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ if (sys_mount_setattr(open_tree_fd, "", AT_EMPTY_PATH, &attr, sizeof(attr))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ if (!switch_fsids(0, 0)) {
+ log_stderr("failure: switch_fsids");
+ goto out;
+ }
+
+ /*
+ * The caller's fsids don't have a mappings in the idmapped mount so
+ * any file creation must fail.
+ */
+
+ /*
+ * The open_tree() syscall returns an O_PATH file descriptor which we
+ * can't use with ioctl(). So let's reopen it as a proper file
+ * descriptor.
+ */
+ tree_fd = openat(open_tree_fd, ".", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (tree_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ /* create subvolume */
+ if (!btrfs_create_subvolume(tree_fd, BTRFS_SUBVOLUME2)) {
+ log_stderr("failure: btrfs_create_subvolume");
+ goto out;
+ }
+ if (errno != EOVERFLOW) {
+ log_stderr("failure: errno");
+ goto out;
+ }
+
+ /* try to rename a subvolume */
+ if (!renameat2(open_tree_fd, BTRFS_SUBVOLUME1, open_tree_fd,
+ BTRFS_SUBVOLUME1_RENAME, 0)) {
+ log_stderr("failure: renameat2");
+ goto out;
+ }
+ if (errno != EOVERFLOW) {
+ log_stderr("failure: errno");
+ goto out;
+ }
+
+ /* The caller is privileged over the inode so file deletion must work. */
+
+ /* remove subvolume */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1)) {
+ log_stderr("failure: btrfs_delete_subvolume");
+ goto out;
+ }
+
+ fret = 0;
+ log_debug("Ran test");
+out:
+ safe_close(attr.userns_fd);
+ safe_close(open_tree_fd);
+ safe_close(tree_fd);
+
+ return fret;
+}
+
+static int btrfs_subvolumes_fsids_unmapped_userns(void)
+{
+ int fret = -1;
+ int open_tree_fd = -EBADF, tree_fd = -EBADF, userns_fd = -EBADF;
+ struct mount_attr attr = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ };
+ pid_t pid;
+
+ /* create directory for rename test */
+ if (btrfs_create_subvolume(t_dir1_fd, BTRFS_SUBVOLUME1)) {
+ log_stderr("failure: btrfs_create_subvolume");
+ goto out;
+ }
+
+ /* change ownership of all files to uid 0 */
+ if (fchownat(t_dir1_fd, BTRFS_SUBVOLUME1, 0, 0, 0)) {
+ log_stderr("failure: fchownat");
+ goto out;
+ }
+
+ /* Changing mount properties on a detached mount. */
+ attr.userns_fd = get_userns_fd(0, 10000, 10000);
+ if (attr.userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ /* Changing mount properties on a detached mount. */
+ userns_fd = get_userns_fd(0, 30000, 10000);
+ if (userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ open_tree_fd = sys_open_tree(t_dir1_fd, "",
+ AT_EMPTY_PATH |
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (open_tree_fd < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ if (sys_mount_setattr(open_tree_fd, "", AT_EMPTY_PATH, &attr, sizeof(attr))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ /*
+ * The open_tree() syscall returns an O_PATH file descriptor which we
+ * can't use with ioctl(). So let's reopen it as a proper file
+ * descriptor.
+ */
+ tree_fd = openat(open_tree_fd, ".", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (tree_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ if (!switch_userns(userns_fd, 0, 0, false))
+ die("failure: switch_userns");
+
+ if (!expected_uid_gid(t_dir1_fd, BTRFS_SUBVOLUME1, 0,
+ t_overflowuid, t_overflowgid))
+ die("failure: expected_uid_gid");
+
+ if (!expected_uid_gid(open_tree_fd, BTRFS_SUBVOLUME1, 0,
+ t_overflowuid, t_overflowgid))
+ die("failure: expected_uid_gid");
+
+ /*
+ * The caller's fsids don't have a mappings in the idmapped mount so
+ * any file creation must fail.
+ */
+
+ /* create subvolume */
+ if (!btrfs_create_subvolume(tree_fd, BTRFS_SUBVOLUME2))
+ die("failure: btrfs_create_subvolume");
+ if (errno != EOVERFLOW)
+ die("failure: errno");
+
+ /* try to rename a subvolume */
+ if (!renameat2(open_tree_fd, BTRFS_SUBVOLUME1, open_tree_fd,
+ BTRFS_SUBVOLUME1_RENAME, 0))
+ die("failure: renameat2");
+ if (errno != EOVERFLOW)
+ die("failure: errno");
+
+ /*
+ * The caller is not privileged over the inode so subvolume
+ * deletion must fail.
+ */
+
+ /* remove subvolume */
+ if (!btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_delete_subvolume");
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ /* remove subvolume */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1)) {
+ log_stderr("failure: btrfs_delete_subvolume");
+ goto out;
+ }
+
+ fret = 0;
+ log_debug("Ran test");
+out:
+ safe_close(attr.userns_fd);
+ safe_close(open_tree_fd);
+ safe_close(tree_fd);
+ safe_close(userns_fd);
+
+ return fret;
+}
+
+static int btrfs_snapshots_fsids_mapped(void)
+{
+ int fret = -1;
+ int open_tree_fd = -EBADF, tree_fd = -EBADF;
+ struct mount_attr attr = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ };
+ pid_t pid;
+
+ if (!caps_supported())
+ return 0;
+
+ /* Changing mount properties on a detached mount. */
+ attr.userns_fd = get_userns_fd(0, 10000, 10000);
+ if (attr.userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ open_tree_fd = sys_open_tree(t_dir1_fd, "",
+ AT_EMPTY_PATH |
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (open_tree_fd < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ if (sys_mount_setattr(open_tree_fd, "", AT_EMPTY_PATH, &attr, sizeof(attr))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ /*
+ * The open_tree() syscall returns an O_PATH file descriptor which we
+ * can't use with ioctl(). So let's reopen it as a proper file
+ * descriptor.
+ */
+ tree_fd = openat(open_tree_fd, ".", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (tree_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ int subvolume_fd = -EBADF;
+
+ if (!switch_fsids(10000, 10000))
+ die("failure: switch fsids");
+
+ if (!caps_up())
+ die("failure: raise caps");
+
+ /* The caller's fsids now have mappings in the idmapped mount so
+ * any file creation must fail.
+ */
+
+ /* create subvolume */
+ if (btrfs_create_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_create_subvolume");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1, 0, 10000, 10000))
+ die("failure: expected_uid_gid");
+
+ subvolume_fd = openat(tree_fd, BTRFS_SUBVOLUME1,
+ O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fd < 0)
+ die("failure: openat");
+
+ /* create read-write snapshot */
+ if (btrfs_create_snapshot(subvolume_fd, tree_fd,
+ BTRFS_SUBVOLUME1_SNAPSHOT1, 0))
+ die("failure: btrfs_create_snapshot");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1, 0, 10000, 10000))
+ die("failure: expected_uid_gid");
+
+ /* create read-only snapshot */
+ if (btrfs_create_snapshot(subvolume_fd, tree_fd,
+ BTRFS_SUBVOLUME1_SNAPSHOT1_RO,
+ BTRFS_SUBVOL_RDONLY))
+ die("failure: btrfs_create_snapshot");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1_RO, 0, 10000, 10000))
+ die("failure: expected_uid_gid");
+
+ safe_close(subvolume_fd);
+
+ /* remove subvolume */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_delete_subvolume");
+
+ /* remove read-write snapshot */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1))
+ die("failure: btrfs_delete_subvolume");
+
+ /* remove read-only snapshot */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1_RO))
+ die("failure: btrfs_delete_subvolume");
+
+ /* create directory */
+ if (btrfs_create_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_create_subvolume");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1, 0, 10000, 10000))
+ die("failure: expected_uid_gid");
+
+ subvolume_fd = openat(tree_fd, BTRFS_SUBVOLUME1,
+ O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fd < 0)
+ die("failure: openat");
+
+ /* create read-write snapshot */
+ if (btrfs_create_snapshot(subvolume_fd, tree_fd,
+ BTRFS_SUBVOLUME1_SNAPSHOT1, 0))
+ die("failure: btrfs_create_snapshot");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1, 0, 10000, 10000))
+ die("failure: expected_uid_gid");
+
+ /* create read-only snapshot */
+ if (btrfs_create_snapshot(subvolume_fd, tree_fd,
+ BTRFS_SUBVOLUME1_SNAPSHOT1_RO,
+ BTRFS_SUBVOL_RDONLY))
+ die("failure: btrfs_create_snapshot");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1_RO, 0, 10000, 10000))
+ die("failure: expected_uid_gid");
+
+ safe_close(subvolume_fd);
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ /* remove directory */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1)) {
+ log_stderr("failure: btrfs_delete_subvolume");
+ goto out;
+ }
+
+ /* remove read-write snapshot */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1)) {
+ log_stderr("failure: btrfs_delete_subvolume");
+ goto out;
+ }
+
+ /* remove read-only snapshot */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1_RO)) {
+ log_stderr("failure: btrfs_delete_subvolume");
+ goto out;
+ }
+
+ fret = 0;
+ log_debug("Ran test");
+out:
+ safe_close(attr.userns_fd);
+ safe_close(open_tree_fd);
+ safe_close(tree_fd);
+
+ return fret;
+}
+
+static int btrfs_snapshots_fsids_mapped_userns(void)
+{
+ int fret = -1;
+ int open_tree_fd = -EBADF, tree_fd = -EBADF;
+ struct mount_attr attr = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ };
+ pid_t pid;
+
+ if (!caps_supported())
+ return 0;
+
+ /* Changing mount properties on a detached mount. */
+ attr.userns_fd = get_userns_fd(0, 10000, 10000);
+ if (attr.userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ open_tree_fd = sys_open_tree(t_dir1_fd, "",
+ AT_EMPTY_PATH |
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (open_tree_fd < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ if (sys_mount_setattr(open_tree_fd, "", AT_EMPTY_PATH, &attr, sizeof(attr))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ /*
+ * The open_tree() syscall returns an O_PATH file descriptor which we
+ * can't use with ioctl(). So let's reopen it as a proper file
+ * descriptor.
+ */
+ tree_fd = openat(open_tree_fd, ".", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (tree_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ int subvolume_fd = -EBADF;
+
+ if (!switch_userns(attr.userns_fd, 0, 0, false))
+ die("failure: switch_userns");
+
+ /* create subvolume */
+ if (btrfs_create_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_create_subvolume");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1, 0, 0, 0))
+ die("failure: expected_uid_gid");
+
+ subvolume_fd = openat(tree_fd, BTRFS_SUBVOLUME1,
+ O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fd < 0)
+ die("failure: openat");
+
+ /* create read-write snapshot */
+ if (btrfs_create_snapshot(subvolume_fd, tree_fd,
+ BTRFS_SUBVOLUME1_SNAPSHOT1, 0))
+ die("failure: btrfs_create_snapshot");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1, 0, 0, 0))
+ die("failure: expected_uid_gid");
+
+ /* create read-only snapshot */
+ if (btrfs_create_snapshot(subvolume_fd, tree_fd,
+ BTRFS_SUBVOLUME1_SNAPSHOT1_RO,
+ BTRFS_SUBVOL_RDONLY))
+ die("failure: btrfs_create_snapshot");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1_RO, 0, 0, 0))
+ die("failure: expected_uid_gid");
+
+ safe_close(subvolume_fd);
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1, 0, 10000, 10000))
+ die("failure: expected_uid_gid");
+
+ /* remove directory */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1)) {
+ log_stderr("failure: btrfs_delete_subvolume");
+ goto out;
+ }
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1, 0, 10000, 10000))
+ die("failure: expected_uid_gid");
+
+ /* remove read-write snapshot */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1)) {
+ log_stderr("failure: btrfs_delete_subvolume");
+ goto out;
+ }
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1_RO, 0, 10000, 10000))
+ die("failure: expected_uid_gid");
+
+ /* remove read-only snapshot */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1_RO)) {
+ log_stderr("failure: btrfs_delete_subvolume");
+ goto out;
+ }
+
+ fret = 0;
+ log_debug("Ran test");
+out:
+ safe_close(attr.userns_fd);
+ safe_close(open_tree_fd);
+ safe_close(tree_fd);
+
+ return fret;
+}
+
+static int btrfs_snapshots_fsids_unmapped(void)
+{
+ int fret = -1;
+ int open_tree_fd = -EBADF, tree_fd = -EBADF;
+ struct mount_attr attr = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ };
+ pid_t pid;
+
+ if (!caps_supported())
+ return 0;
+
+ /* create directory for rename test */
+ if (btrfs_create_subvolume(t_dir1_fd, BTRFS_SUBVOLUME1)) {
+ log_stderr("failure: btrfs_create_subvolume");
+ goto out;
+ }
+
+ /* change ownership of all files to uid 0 */
+ if (fchownat(t_dir1_fd, BTRFS_SUBVOLUME1, 0, 0, 0)) {
+ log_stderr("failure: fchownat");
+ goto out;
+ }
+
+ /* Changing mount properties on a detached mount. */
+ attr.userns_fd = get_userns_fd(0, 10000, 10000);
+ if (attr.userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ open_tree_fd = sys_open_tree(t_dir1_fd, "",
+ AT_EMPTY_PATH |
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (open_tree_fd < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ if (sys_mount_setattr(open_tree_fd, "", AT_EMPTY_PATH, &attr,
+ sizeof(attr))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ int subvolume_fd = -EBADF;
+
+ if (!switch_fsids(0, 0)) {
+ log_stderr("failure: switch_fsids");
+ goto out;
+ }
+
+ /*
+ * The caller's fsids don't have a mappings in the idmapped
+ * mount so any file creation must fail.
+ */
+
+ /*
+ * The open_tree() syscall returns an O_PATH file descriptor
+ * which we can't use with ioctl(). So let's reopen it as a
+ * proper file descriptor.
+ */
+ tree_fd = openat(open_tree_fd, ".",
+ O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (tree_fd < 0)
+ die("failure: openat");
+
+ subvolume_fd = openat(tree_fd, BTRFS_SUBVOLUME1,
+ O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fd < 0)
+ die("failure: openat");
+
+ /* create directory */
+ if (!btrfs_create_subvolume(tree_fd, BTRFS_SUBVOLUME2))
+ die("failure: btrfs_create_subvolume");
+ if (errno != EOVERFLOW)
+ die("failure: errno");
+
+ /* create read-write snapshot */
+ if (!btrfs_create_snapshot(subvolume_fd, tree_fd,
+ BTRFS_SUBVOLUME1_SNAPSHOT1, 0))
+ die("failure: btrfs_create_snapshot");
+ if (errno != EOVERFLOW)
+ die("failure: errno");
+
+ /* create read-only snapshot */
+ if (!btrfs_create_snapshot(subvolume_fd, tree_fd,
+ BTRFS_SUBVOLUME1_SNAPSHOT1_RO,
+ BTRFS_SUBVOL_RDONLY))
+ die("failure: btrfs_create_snapshot");
+ if (errno != EOVERFLOW)
+ die("failure: errno");
+
+ /* try to rename a directory */
+ if (!renameat2(open_tree_fd, BTRFS_SUBVOLUME1, open_tree_fd,
+ BTRFS_SUBVOLUME1_RENAME, 0))
+ die("failure: renameat2");
+ if (errno != EOVERFLOW)
+ die("failure: errno");
+
+ if (!caps_down())
+ die("failure: caps_down");
+
+ /* create read-write snapshot */
+ if (!btrfs_create_snapshot(subvolume_fd, tree_fd,
+ BTRFS_SUBVOLUME1_SNAPSHOT1, 0))
+ die("failure: btrfs_create_snapshot");
+ if (errno != EPERM)
+ die("failure: errno");
+
+ /* create read-only snapshot */
+ if (!btrfs_create_snapshot(subvolume_fd, tree_fd,
+ BTRFS_SUBVOLUME1_SNAPSHOT1_RO,
+ BTRFS_SUBVOL_RDONLY))
+ die("failure: btrfs_create_snapshot");
+ if (errno != EPERM)
+ die("failure: errno");
+
+ /*
+ * The caller is not privileged over the inode so subvolume
+ * deletion must fail.
+ */
+
+ /* remove directory */
+ if (!btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_delete_subvolume");
+ if (errno != EPERM)
+ die("failure: errno");
+
+ if (!caps_up())
+ die("failure: caps_down");
+
+ /*
+ * The caller is privileged over the inode so subvolume
+ * deletion must work.
+ */
+
+ /* remove directory */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_delete_subvolume");
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ fret = 0;
+ log_debug("Ran test");
+out:
+ safe_close(attr.userns_fd);
+ safe_close(open_tree_fd);
+ safe_close(tree_fd);
+
+ return fret;
+}
+
+static int btrfs_snapshots_fsids_unmapped_userns(void)
+{
+ int fret = -1;
+ int open_tree_fd = -EBADF, subvolume_fd = -EBADF, tree_fd = -EBADF,
+ userns_fd = -EBADF;
+ struct mount_attr attr = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ };
+ pid_t pid;
+
+ if (!caps_supported())
+ return 0;
+
+ /* create directory for rename test */
+ if (btrfs_create_subvolume(t_dir1_fd, BTRFS_SUBVOLUME1)) {
+ log_stderr("failure: btrfs_create_subvolume");
+ goto out;
+ }
+
+ /* change ownership of all files to uid 0 */
+ if (fchownat(t_dir1_fd, BTRFS_SUBVOLUME1, 0, 0, 0)) {
+ log_stderr("failure: fchownat");
+ goto out;
+ }
+
+ /* Changing mount properties on a detached mount. */
+ attr.userns_fd = get_userns_fd(0, 10000, 10000);
+ if (attr.userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ /* Changing mount properties on a detached mount. */
+ userns_fd = get_userns_fd(0, 30000, 10000);
+ if (userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ open_tree_fd = sys_open_tree(t_dir1_fd, "",
+ AT_EMPTY_PATH |
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (open_tree_fd < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ if (sys_mount_setattr(open_tree_fd, "", AT_EMPTY_PATH, &attr,
+ sizeof(attr))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ /*
+ * The open_tree() syscall returns an O_PATH file descriptor
+ * which we can't use with ioctl(). So let's reopen it as a
+ * proper file descriptor.
+ */
+ tree_fd = openat(open_tree_fd, ".",
+ O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (tree_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ subvolume_fd = openat(tree_fd, BTRFS_SUBVOLUME1,
+ O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ if (!switch_userns(userns_fd, 0, 0, false))
+ die("failure: switch_userns");
+
+ if (!expected_uid_gid(t_dir1_fd, BTRFS_SUBVOLUME1, 0,
+ t_overflowuid, t_overflowgid))
+ die("failure: expected_uid_gid");
+
+ if (!expected_uid_gid(open_tree_fd, BTRFS_SUBVOLUME1, 0,
+ t_overflowuid, t_overflowgid))
+ die("failure: expected_uid_gid");
+
+ /*
+ * The caller's fsids don't have a mappings in the idmapped
+ * mount so any file creation must fail.
+ */
+
+ /* create directory */
+ if (!btrfs_create_subvolume(tree_fd, BTRFS_SUBVOLUME2))
+ die("failure: btrfs_create_subvolume");
+ if (errno != EOVERFLOW)
+ die("failure: errno");
+
+ /* create read-write snapshot */
+ if (!btrfs_create_snapshot(subvolume_fd, tree_fd,
+ BTRFS_SUBVOLUME1_SNAPSHOT1, 0))
+ die("failure: btrfs_create_snapshot");
+ if (errno != EPERM)
+ die("failure: errno");
+
+ /* create read-only snapshot */
+ if (!btrfs_create_snapshot(subvolume_fd, tree_fd,
+ BTRFS_SUBVOLUME1_SNAPSHOT1_RO,
+ BTRFS_SUBVOL_RDONLY))
+ die("failure: btrfs_create_snapshot");
+ if (errno != EPERM)
+ die("failure: errno");
+
+ /* try to rename a directory */
+ if (!renameat2(open_tree_fd, BTRFS_SUBVOLUME1, open_tree_fd,
+ BTRFS_SUBVOLUME1_RENAME, 0))
+ die("failure: renameat2");
+ if (errno != EOVERFLOW)
+ die("failure: errno");
+
+ /*
+ * The caller is not privileged over the inode so subvolume
+ * deletion must fail.
+ */
+
+ /* remove directory */
+ if (!btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_delete_subvolume");
+ if (errno != EPERM)
+ die("failure: errno");
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ /* remove directory */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_delete_subvolume");
+
+ fret = 0;
+ log_debug("Ran test");
+out:
+ safe_close(attr.userns_fd);
+ safe_close(open_tree_fd);
+ safe_close(subvolume_fd);
+ safe_close(tree_fd);
+
+ return fret;
+}
+
+static int btrfs_subvolumes_fsids_mapped_user_subvol_rm_allowed(void)
+{
+ int fret = -1;
+ int open_tree_fd = -EBADF, tree_fd = -EBADF;
+ struct mount_attr attr = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ };
+ pid_t pid;
+
+ if (!caps_supported())
+ return 0;
+
+ /* Changing mount properties on a detached mount. */
+ attr.userns_fd = get_userns_fd(0, 10000, 10000);
+ if (attr.userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ open_tree_fd = sys_open_tree(t_mnt_scratch_fd, "",
+ AT_EMPTY_PATH |
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (open_tree_fd < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ if (sys_mount_setattr(open_tree_fd, "", AT_EMPTY_PATH, &attr, sizeof(attr))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ /*
+ * The open_tree() syscall returns an O_PATH file descriptor which we
+ * can't use with ioctl(). So let's reopen it as a proper file
+ * descriptor.
+ */
+ tree_fd = openat(open_tree_fd, ".", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (tree_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ if (!switch_fsids(10000, 10000))
+ die("failure: switch fsids");
+
+ if (!caps_down())
+ die("failure: raise caps");
+
+ /*
+ * The caller's fsids now have mappings in the idmapped mount so
+ * any file creation must succedd.
+ */
+
+ /* create subvolume */
+ if (btrfs_create_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_create_subvolume");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1, 0, 10000, 10000))
+ die("failure: check ownership");
+
+ /*
+ * The scratch device is mounted with user_subvol_rm_allowed so
+ * subvolume deletion must succeed.
+ */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_delete_subvolume");
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ fret = 0;
+ log_debug("Ran test");
+out:
+ safe_close(attr.userns_fd);
+ safe_close(open_tree_fd);
+ safe_close(tree_fd);
+
+ return fret;
+}
+
+static int btrfs_subvolumes_fsids_mapped_userns_user_subvol_rm_allowed(void)
+{
+ int fret = -1;
+ int open_tree_fd = -EBADF, tree_fd = -EBADF;
+ struct mount_attr attr = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ };
+ pid_t pid;
+
+ if (!caps_supported())
+ return 0;
+
+ /* Changing mount properties on a detached mount. */
+ attr.userns_fd = get_userns_fd(0, 10000, 10000);
+ if (attr.userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ open_tree_fd = sys_open_tree(t_mnt_scratch_fd, "",
+ AT_EMPTY_PATH |
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (open_tree_fd < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ if (sys_mount_setattr(open_tree_fd, "", AT_EMPTY_PATH, &attr, sizeof(attr))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ /*
+ * The open_tree() syscall returns an O_PATH file descriptor which we
+ * can't use with ioctl(). So let's reopen it as a proper file
+ * descriptor.
+ */
+ tree_fd = openat(open_tree_fd, ".", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (tree_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ if (!switch_userns(attr.userns_fd, 0, 0, false))
+ die("failure: switch_userns");
+
+ /* The caller's fsids now have mappings in the idmapped mount so
+ * any file creation must fail.
+ */
+
+ /* create subvolume */
+ if (btrfs_create_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_create_subvolume");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1, 0, 0, 0))
+ die("failure: check ownership");
+
+ /*
+ * The scratch device is mounted with user_subvol_rm_allowed so
+ * subvolume deletion must succeed.
+ */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_delete_subvolume");
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ fret = 0;
+ log_debug("Ran test");
+out:
+ safe_close(attr.userns_fd);
+ safe_close(open_tree_fd);
+ safe_close(tree_fd);
+
+ return fret;
+}
+
+static int btrfs_snapshots_fsids_mapped_user_subvol_rm_allowed(void)
+{
+ int fret = -1;
+ int open_tree_fd = -EBADF, tree_fd = -EBADF;
+ struct mount_attr attr = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ };
+ pid_t pid;
+
+ if (!caps_supported())
+ return 0;
+
+ /* Changing mount properties on a detached mount. */
+ attr.userns_fd = get_userns_fd(0, 10000, 10000);
+ if (attr.userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ open_tree_fd = sys_open_tree(t_mnt_scratch_fd, "",
+ AT_EMPTY_PATH |
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (open_tree_fd < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ if (sys_mount_setattr(open_tree_fd, "", AT_EMPTY_PATH, &attr, sizeof(attr))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ /*
+ * The open_tree() syscall returns an O_PATH file descriptor which we
+ * can't use with ioctl(). So let's reopen it as a proper file
+ * descriptor.
+ */
+ tree_fd = openat(open_tree_fd, ".", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (tree_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ int subvolume_fd = -EBADF;
+
+ if (!switch_fsids(10000, 10000))
+ die("failure: switch fsids");
+
+ if (!caps_down())
+ die("failure: raise caps");
+
+ /*
+ * The caller's fsids now have mappings in the idmapped mount so
+ * any file creation must succeed.
+ */
+
+ /* create subvolume */
+ if (btrfs_create_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_create_subvolume");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1, 0, 10000, 10000))
+ die("failure: expected_uid_gid");
+
+ subvolume_fd = openat(tree_fd, BTRFS_SUBVOLUME1,
+ O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fd < 0)
+ die("failure: openat");
+
+ /* create read-write snapshot */
+ if (btrfs_create_snapshot(subvolume_fd, tree_fd,
+ BTRFS_SUBVOLUME1_SNAPSHOT1, 0))
+ die("failure: btrfs_create_snapshot");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1, 0, 10000, 10000))
+ die("failure: expected_uid_gid");
+
+ /* create read-only snapshot */
+ if (btrfs_create_snapshot(subvolume_fd, tree_fd,
+ BTRFS_SUBVOLUME1_SNAPSHOT1_RO,
+ BTRFS_SUBVOL_RDONLY))
+ die("failure: btrfs_create_snapshot");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1_RO, 0, 10000, 10000))
+ die("failure: expected_uid_gid");
+
+ safe_close(subvolume_fd);
+
+ /* remove subvolume */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_delete_subvolume");
+
+ /* remove read-write snapshot */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1))
+ die("failure: btrfs_delete_subvolume");
+
+ /* remove read-only snapshot */
+ if (!btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1_RO))
+ die("failure: btrfs_delete_subvolume");
+
+ subvolume_fd = openat(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1_RO,
+ O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fd < 0)
+ die("failure: openat");
+
+ if (btrfs_set_subvolume_ro(subvolume_fd, false))
+ die("failure: btrfs_set_subvolume_ro");
+
+ safe_close(subvolume_fd);
+
+ /* remove read-only snapshot */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1_RO))
+ die("failure: btrfs_delete_subvolume");
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ fret = 0;
+ log_debug("Ran test");
+out:
+ safe_close(attr.userns_fd);
+ safe_close(open_tree_fd);
+ safe_close(tree_fd);
+
+ return fret;
+}
+
+static int btrfs_snapshots_fsids_mapped_userns_user_subvol_rm_allowed(void)
+{
+ int fret = -1;
+ int open_tree_fd = -EBADF, tree_fd = -EBADF;
+ struct mount_attr attr = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ };
+ pid_t pid;
+
+ if (!caps_supported())
+ return 0;
+
+ /* Changing mount properties on a detached mount. */
+ attr.userns_fd = get_userns_fd(0, 10000, 10000);
+ if (attr.userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ open_tree_fd = sys_open_tree(t_mnt_scratch_fd, "",
+ AT_EMPTY_PATH |
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (open_tree_fd < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ if (sys_mount_setattr(open_tree_fd, "", AT_EMPTY_PATH, &attr, sizeof(attr))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ /*
+ * The open_tree() syscall returns an O_PATH file descriptor which we
+ * can't use with ioctl(). So let's reopen it as a proper file
+ * descriptor.
+ */
+ tree_fd = openat(open_tree_fd, ".", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (tree_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ int subvolume_fd = -EBADF;
+
+ if (!switch_userns(attr.userns_fd, 0, 0, false))
+ die("failure: switch_userns");
+
+ /* create subvolume */
+ if (btrfs_create_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_create_subvolume");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1, 0, 0, 0))
+ die("failure: expected_uid_gid");
+
+ subvolume_fd = openat(tree_fd, BTRFS_SUBVOLUME1,
+ O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fd < 0)
+ die("failure: openat");
+
+ /* create read-write snapshot */
+ if (btrfs_create_snapshot(subvolume_fd, tree_fd,
+ BTRFS_SUBVOLUME1_SNAPSHOT1, 0))
+ die("failure: btrfs_create_snapshot");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1, 0, 0, 0))
+ die("failure: expected_uid_gid");
+
+ /* create read-only snapshot */
+ if (btrfs_create_snapshot(subvolume_fd, tree_fd,
+ BTRFS_SUBVOLUME1_SNAPSHOT1_RO,
+ BTRFS_SUBVOL_RDONLY))
+ die("failure: btrfs_create_snapshot");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1_RO, 0, 0, 0))
+ die("failure: expected_uid_gid");
+
+ /* remove directory */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_delete_subvolume");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1, 0, 0, 0))
+ die("failure: expected_uid_gid");
+
+ /* remove read-write snapshot */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1))
+ die("failure: btrfs_delete_subvolume");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1_RO, 0, 0, 0))
+ die("failure: expected_uid_gid");
+
+ /* remove read-only snapshot */
+ if (!btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1_RO))
+ die("failure: btrfs_delete_subvolume");
+
+ subvolume_fd = openat(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1_RO,
+ O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fd < 0)
+ die("failure: openat");
+
+ if (btrfs_set_subvolume_ro(subvolume_fd, false))
+ die("failure: btrfs_set_subvolume_ro");
+
+ safe_close(subvolume_fd);
+
+ /* remove read-only snapshot */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1_RO))
+ die("failure: btrfs_delete_subvolume");
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ fret = 0;
+ log_debug("Ran test");
+out:
+ safe_close(attr.userns_fd);
+ safe_close(open_tree_fd);
+ safe_close(tree_fd);
+
+ return fret;
+}
+
+static int btrfs_delete_by_spec_id(void)
+{
+ int fret = -1;
+ int open_tree_fd = -EBADF, subvolume_fd = -EBADF, tree_fd = -EBADF;
+ uint64_t subvolume_id1 = -EINVAL, subvolume_id2 = -EINVAL;
+ struct mount_attr attr = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ };
+ pid_t pid;
+
+ /* Changing mount properties on a detached mount. */
+ attr.userns_fd = get_userns_fd(0, 10000, 10000);
+ if (attr.userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ /* create subvolume */
+ if (btrfs_create_subvolume(t_mnt_scratch_fd, "A")) {
+ log_stderr("failure: btrfs_create_subvolume");
+ goto out;
+ }
+
+ /* create subvolume */
+ if (btrfs_create_subvolume(t_mnt_scratch_fd, "B")) {
+ log_stderr("failure: btrfs_create_subvolume");
+ goto out;
+ }
+
+ subvolume_fd = openat(t_mnt_scratch_fd, "B", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ /* create subvolume */
+ if (btrfs_create_subvolume(subvolume_fd, "C")) {
+ log_stderr("failure: btrfs_create_subvolume");
+ goto out;
+ }
+
+ safe_close(subvolume_fd);
+
+ subvolume_fd = openat(t_mnt_scratch_fd, "A", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ if (btrfs_get_subvolume_id(subvolume_fd, &subvolume_id1)) {
+ log_stderr("failure: btrfs_get_subvolume_id");
+ goto out;
+ }
+
+ subvolume_fd = openat(t_mnt_scratch_fd, "B/C", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ if (btrfs_get_subvolume_id(subvolume_fd, &subvolume_id2)) {
+ log_stderr("failure: btrfs_get_subvolume_id");
+ goto out;
+ }
+
+ if (sys_mount(t_device_scratch, t_mountpoint, "btrfs", 0, "subvol=B/C")) {
+ log_stderr("failure: mount");
+ goto out;
+ }
+
+ open_tree_fd = sys_open_tree(-EBADF, t_mountpoint,
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (open_tree_fd < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ if (sys_mount_setattr(open_tree_fd, "", AT_EMPTY_PATH, &attr, sizeof(attr))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ /*
+ * The open_tree() syscall returns an O_PATH file descriptor which we
+ * can't use with ioctl(). So let's reopen it as a proper file
+ * descriptor.
+ */
+ tree_fd = openat(open_tree_fd, ".", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (tree_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ /*
+ * The subvolume isn't exposed in the idmapped mount so
+ * delation via spec id must fail.
+ */
+ if (!btrfs_delete_subvolume_id(tree_fd, subvolume_id1))
+ die("failure: btrfs_delete_subvolume_id");
+ if (errno != EOPNOTSUPP)
+ die("failure: errno");
+
+ if (btrfs_delete_subvolume_id(t_mnt_scratch_fd, subvolume_id1))
+ die("failure: btrfs_delete_subvolume_id");
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ fret = 0;
+ log_debug("Ran test");
+out:
+ safe_close(attr.userns_fd);
+ safe_close(open_tree_fd);
+ safe_close(tree_fd);
+ sys_umount2(t_mountpoint, MNT_DETACH);
+ btrfs_delete_subvolume_id(t_mnt_scratch_fd, subvolume_id2);
+ btrfs_delete_subvolume(t_mnt_scratch_fd, "B");
+
+ return fret;
+}
+
+static int btrfs_subvolumes_setflags_fsids_mapped(void)
+{
+ int fret = -1;
+ int open_tree_fd = -EBADF, tree_fd = -EBADF;
+ struct mount_attr attr = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ };
+ pid_t pid;
+
+ if (!caps_supported())
+ return 0;
+
+ /* Changing mount properties on a detached mount. */
+ attr.userns_fd = get_userns_fd(0, 10000, 10000);
+ if (attr.userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ open_tree_fd = sys_open_tree(t_dir1_fd, "",
+ AT_EMPTY_PATH |
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (open_tree_fd < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ if (sys_mount_setattr(open_tree_fd, "", AT_EMPTY_PATH, &attr, sizeof(attr))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ /*
+ * The open_tree() syscall returns an O_PATH file descriptor which we
+ * can't use with ioctl(). So let's reopen it as a proper file
+ * descriptor.
+ */
+ tree_fd = openat(open_tree_fd, ".", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (tree_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ int subvolume_fd = -EBADF;
+ bool read_only = false;
+
+ if (!switch_fsids(10000, 10000))
+ die("failure: switch fsids");
+
+ if (!caps_down())
+ die("failure: raise caps");
+
+ /* The caller's fsids now have mappings in the idmapped mount so
+ * any file creation must fail.
+ */
+
+ /* create subvolume */
+ if (btrfs_create_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_create_subvolume");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1, 0, 10000, 10000))
+ die("failure: expected_uid_gid");
+
+ subvolume_fd = openat(tree_fd, BTRFS_SUBVOLUME1,
+ O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fd < 0)
+ die("failure: openat");
+
+ if (btrfs_get_subvolume_ro(subvolume_fd, &read_only))
+ die("failure: btrfs_get_subvolume_ro");
+
+ if (read_only)
+ die("failure: read_only");
+
+ if (btrfs_set_subvolume_ro(subvolume_fd, true))
+ die("failure: btrfs_set_subvolume_ro");
+
+ if (btrfs_get_subvolume_ro(subvolume_fd, &read_only))
+ die("failure: btrfs_get_subvolume_ro");
+
+ if (!read_only)
+ die("failure: not read_only");
+
+ if (btrfs_set_subvolume_ro(subvolume_fd, false))
+ die("failure: btrfs_set_subvolume_ro");
+
+ if (btrfs_get_subvolume_ro(subvolume_fd, &read_only))
+ die("failure: btrfs_get_subvolume_ro");
+
+ if (read_only)
+ die("failure: read_only");
+
+ safe_close(subvolume_fd);
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ /* remove directory */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1)) {
+ log_stderr("failure: btrfs_delete_subvolume");
+ goto out;
+ }
+
+ fret = 0;
+ log_debug("Ran test");
+out:
+ safe_close(attr.userns_fd);
+ safe_close(open_tree_fd);
+ safe_close(tree_fd);
+
+ return fret;
+}
+
+static int btrfs_subvolumes_setflags_fsids_mapped_userns(void)
+{
+ int fret = -1;
+ int open_tree_fd = -EBADF, tree_fd = -EBADF;
+ struct mount_attr attr = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ };
+ pid_t pid;
+
+ if (!caps_supported())
+ return 0;
+
+ /* Changing mount properties on a detached mount. */
+ attr.userns_fd = get_userns_fd(0, 10000, 10000);
+ if (attr.userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ open_tree_fd = sys_open_tree(t_dir1_fd, "",
+ AT_EMPTY_PATH |
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (open_tree_fd < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ if (sys_mount_setattr(open_tree_fd, "", AT_EMPTY_PATH, &attr, sizeof(attr))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ /*
+ * The open_tree() syscall returns an O_PATH file descriptor which we
+ * can't use with ioctl(). So let's reopen it as a proper file
+ * descriptor.
+ */
+ tree_fd = openat(open_tree_fd, ".", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (tree_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ int subvolume_fd = -EBADF;
+ bool read_only = false;
+
+ if (!switch_userns(attr.userns_fd, 0, 0, false))
+ die("failure: switch_userns");
+
+ /* The caller's fsids now have mappings in the idmapped mount so
+ * any file creation must fail.
+ */
+
+ /* create subvolume */
+ if (btrfs_create_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_create_subvolume");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1, 0, 0, 0))
+ die("failure: expected_uid_gid");
+
+ subvolume_fd = openat(tree_fd, BTRFS_SUBVOLUME1,
+ O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fd < 0)
+ die("failure: openat");
+
+ if (btrfs_get_subvolume_ro(subvolume_fd, &read_only))
+ die("failure: btrfs_get_subvolume_ro");
+
+ if (read_only)
+ die("failure: read_only");
+
+ if (btrfs_set_subvolume_ro(subvolume_fd, true))
+ die("failure: btrfs_set_subvolume_ro");
+
+ if (btrfs_get_subvolume_ro(subvolume_fd, &read_only))
+ die("failure: btrfs_get_subvolume_ro");
+
+ if (!read_only)
+ die("failure: not read_only");
+
+ if (btrfs_set_subvolume_ro(subvolume_fd, false))
+ die("failure: btrfs_set_subvolume_ro");
+
+ if (btrfs_get_subvolume_ro(subvolume_fd, &read_only))
+ die("failure: btrfs_get_subvolume_ro");
+
+ if (read_only)
+ die("failure: read_only");
+
+ safe_close(subvolume_fd);
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ /* remove directory */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1)) {
+ log_stderr("failure: btrfs_delete_subvolume");
+ goto out;
+ }
+
+ fret = 0;
+ log_debug("Ran test");
+out:
+ safe_close(attr.userns_fd);
+ safe_close(open_tree_fd);
+ safe_close(tree_fd);
+
+ return fret;
+}
+
+static int btrfs_subvolumes_setflags_fsids_unmapped(void)
+{
+ int fret = -1;
+ int open_tree_fd = -EBADF, tree_fd = -EBADF;
+ struct mount_attr attr = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ };
+ pid_t pid;
+
+ if (!caps_supported())
+ return 0;
+
+ /* Changing mount properties on a detached mount. */
+ attr.userns_fd = get_userns_fd(0, 10000, 10000);
+ if (attr.userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ open_tree_fd = sys_open_tree(t_dir1_fd, "",
+ AT_EMPTY_PATH |
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (open_tree_fd < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ if (sys_mount_setattr(open_tree_fd, "", AT_EMPTY_PATH, &attr, sizeof(attr))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ /*
+ * The open_tree() syscall returns an O_PATH file descriptor which we
+ * can't use with ioctl(). So let's reopen it as a proper file
+ * descriptor.
+ */
+ tree_fd = openat(open_tree_fd, ".", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (tree_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ /* create subvolume */
+ if (btrfs_create_subvolume(t_dir1_fd, BTRFS_SUBVOLUME1)) {
+ log_stderr("failure: btrfs_create_subvolume");
+ goto out;
+ }
+
+ if (!expected_uid_gid(t_dir1_fd, BTRFS_SUBVOLUME1, 0, 0, 0)) {
+ log_stderr("failure: expected_uid_gid");
+ goto out;
+ }
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1, 0, 10000, 10000)) {
+ log_stderr("failure: expected_uid_gid");
+ goto out;
+ }
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ int subvolume_fd = -EBADF;
+ bool read_only = false;
+
+ subvolume_fd = openat(tree_fd, BTRFS_SUBVOLUME1,
+ O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fd < 0)
+ die("failure: openat");
+
+ if (!switch_fsids(0, 0))
+ die("failure: switch fsids");
+
+ if (!caps_down())
+ die("failure: raise caps");
+
+ /*
+ * The caller's fsids don't have mappings in the idmapped mount
+ * so any file creation must fail.
+ */
+
+ if (btrfs_get_subvolume_ro(subvolume_fd, &read_only))
+ die("failure: btrfs_get_subvolume_ro");
+
+ if (read_only)
+ die("failure: read_only");
+
+ if (!btrfs_set_subvolume_ro(subvolume_fd, true))
+ die("failure: btrfs_set_subvolume_ro");
+ if (errno != EPERM)
+ die("failure: errno");
+
+ safe_close(subvolume_fd);
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ /* remove directory */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1)) {
+ log_stderr("failure: btrfs_delete_subvolume");
+ goto out;
+ }
+
+ fret = 0;
+ log_debug("Ran test");
+out:
+ safe_close(attr.userns_fd);
+ safe_close(open_tree_fd);
+ safe_close(tree_fd);
+
+ return fret;
+}
+
+static int btrfs_subvolumes_setflags_fsids_unmapped_userns(void)
+{
+ int fret = -1;
+ int open_tree_fd = -EBADF, tree_fd = -EBADF, userns_fd = -EBADF;
+ struct mount_attr attr = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ };
+ pid_t pid;
+
+ if (!caps_supported())
+ return 0;
+
+ /* Changing mount properties on a detached mount. */
+ attr.userns_fd = get_userns_fd(0, 10000, 10000);
+ if (attr.userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ /* Changing mount properties on a detached mount. */
+ userns_fd = get_userns_fd(0, 30000, 10000);
+ if (userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ open_tree_fd = sys_open_tree(t_dir1_fd, "",
+ AT_EMPTY_PATH |
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (open_tree_fd < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ if (sys_mount_setattr(open_tree_fd, "", AT_EMPTY_PATH, &attr, sizeof(attr))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ /*
+ * The open_tree() syscall returns an O_PATH file descriptor which we
+ * can't use with ioctl(). So let's reopen it as a proper file
+ * descriptor.
+ */
+ tree_fd = openat(open_tree_fd, ".", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (tree_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ /* create subvolume */
+ if (btrfs_create_subvolume(t_dir1_fd, BTRFS_SUBVOLUME1)) {
+ log_stderr("failure: btrfs_create_subvolume");
+ goto out;
+ }
+
+ if (!expected_uid_gid(t_dir1_fd, BTRFS_SUBVOLUME1, 0, 0, 0)) {
+ log_stderr("failure: expected_uid_gid");
+ goto out;
+ }
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1, 0, 10000, 10000)) {
+ log_stderr("failure: expected_uid_gid");
+ goto out;
+ }
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ int subvolume_fd = -EBADF;
+ bool read_only = false;
+
+ /*
+ * The caller's fsids don't have mappings in the idmapped mount
+ * so any file creation must fail.
+ */
+
+ subvolume_fd = openat(tree_fd, BTRFS_SUBVOLUME1,
+ O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fd < 0)
+ die("failure: openat");
+
+ if (!switch_userns(userns_fd, 0, 0, false))
+ die("failure: switch_userns");
+
+ if (!expected_uid_gid(t_dir1_fd, BTRFS_SUBVOLUME1, 0,
+ t_overflowuid, t_overflowgid))
+ die("failure: expected_uid_gid");
+
+ if (!expected_uid_gid(open_tree_fd, BTRFS_SUBVOLUME1, 0,
+ t_overflowuid, t_overflowgid))
+ die("failure: expected_uid_gid");
+
+ if (btrfs_get_subvolume_ro(subvolume_fd, &read_only))
+ die("failure: btrfs_get_subvolume_ro");
+
+ if (read_only)
+ die("failure: read_only");
+
+ if (!btrfs_set_subvolume_ro(subvolume_fd, true))
+ die("failure: btrfs_set_subvolume_ro");
+ if (errno != EPERM)
+ die("failure: errno");
+
+ safe_close(subvolume_fd);
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ /* remove directory */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1)) {
+ log_stderr("failure: btrfs_delete_subvolume");
+ goto out;
+ }
+
+ fret = 0;
+ log_debug("Ran test");
+out:
+ safe_close(attr.userns_fd);
+ safe_close(open_tree_fd);
+ safe_close(tree_fd);
+ safe_close(userns_fd);
+
+ return fret;
+}
+
+static int btrfs_snapshots_setflags_fsids_mapped(void)
+{
+ int fret = -1;
+ int open_tree_fd = -EBADF, tree_fd = -EBADF;
+ struct mount_attr attr = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ };
+ pid_t pid;
+
+ if (!caps_supported())
+ return 0;
+
+ /* Changing mount properties on a detached mount. */
+ attr.userns_fd = get_userns_fd(0, 10000, 10000);
+ if (attr.userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ open_tree_fd = sys_open_tree(t_dir1_fd, "",
+ AT_EMPTY_PATH |
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (open_tree_fd < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ if (sys_mount_setattr(open_tree_fd, "", AT_EMPTY_PATH, &attr, sizeof(attr))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ /*
+ * The open_tree() syscall returns an O_PATH file descriptor which we
+ * can't use with ioctl(). So let's reopen it as a proper file
+ * descriptor.
+ */
+ tree_fd = openat(open_tree_fd, ".", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (tree_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ int snapshot_fd = -EBADF, subvolume_fd = -EBADF;
+ bool read_only = false;
+
+ if (!switch_fsids(10000, 10000))
+ die("failure: switch fsids");
+
+ if (!caps_down())
+ die("failure: raise caps");
+
+ /*
+ * The caller's fsids now have mappings in the idmapped mount
+ * so any file creation must succeed.
+ */
+
+ /* create subvolume */
+ if (btrfs_create_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_create_subvolume");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1, 0, 10000, 10000))
+ die("failure: expected_uid_gid");
+
+ subvolume_fd = openat(tree_fd, BTRFS_SUBVOLUME1,
+ O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fd < 0)
+ die("failure: openat");
+
+ /* create read-write snapshot */
+ if (btrfs_create_snapshot(subvolume_fd, tree_fd,
+ BTRFS_SUBVOLUME1_SNAPSHOT1, 0))
+ die("failure: btrfs_create_snapshot");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1, 0, 10000, 10000))
+ die("failure: expected_uid_gid");
+
+ snapshot_fd = openat(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1,
+ O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (snapshot_fd < 0)
+ die("failure: openat");
+
+ if (btrfs_get_subvolume_ro(snapshot_fd, &read_only))
+ die("failure: btrfs_get_subvolume_ro");
+
+ if (read_only)
+ die("failure: read_only");
+
+ if (btrfs_set_subvolume_ro(snapshot_fd, true))
+ die("failure: btrfs_set_subvolume_ro");
+
+ if (btrfs_get_subvolume_ro(snapshot_fd, &read_only))
+ die("failure: btrfs_get_subvolume_ro");
+
+ if (!read_only)
+ die("failure: not read_only");
+
+ if (btrfs_set_subvolume_ro(snapshot_fd, false))
+ die("failure: btrfs_set_subvolume_ro");
+
+ if (btrfs_get_subvolume_ro(snapshot_fd, &read_only))
+ die("failure: btrfs_get_subvolume_ro");
+
+ if (read_only)
+ die("failure: read_only");
+
+ safe_close(snapshot_fd);
+ safe_close(subvolume_fd);
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ /* remove directory */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1)) {
+ log_stderr("failure: btrfs_delete_subvolume");
+ goto out;
+ }
+
+ /* remove directory */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1)) {
+ log_stderr("failure: btrfs_delete_subvolume");
+ goto out;
+ }
+
+ fret = 0;
+ log_debug("Ran test");
+out:
+ safe_close(attr.userns_fd);
+ safe_close(open_tree_fd);
+ safe_close(tree_fd);
+
+ return fret;
+}
+
+static int btrfs_snapshots_setflags_fsids_mapped_userns(void)
+{
+ int fret = -1;
+ int open_tree_fd = -EBADF, tree_fd = -EBADF;
+ struct mount_attr attr = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ };
+ pid_t pid;
+
+ if (!caps_supported())
+ return 0;
+
+ /* Changing mount properties on a detached mount. */
+ attr.userns_fd = get_userns_fd(0, 10000, 10000);
+ if (attr.userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ open_tree_fd = sys_open_tree(t_dir1_fd, "",
+ AT_EMPTY_PATH |
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (open_tree_fd < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ if (sys_mount_setattr(open_tree_fd, "", AT_EMPTY_PATH, &attr, sizeof(attr))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ /*
+ * The open_tree() syscall returns an O_PATH file descriptor which we
+ * can't use with ioctl(). So let's reopen it as a proper file
+ * descriptor.
+ */
+ tree_fd = openat(open_tree_fd, ".", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (tree_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ int snapshot_fd = -EBADF, subvolume_fd = -EBADF;
+ bool read_only = false;
+
+ if (!switch_userns(attr.userns_fd, 0, 0, false))
+ die("failure: switch_userns");
+
+ /*
+ * The caller's fsids now have mappings in the idmapped mount so
+ * any file creation must succeed.
+ */
+
+ /* create subvolume */
+ if (btrfs_create_subvolume(tree_fd, BTRFS_SUBVOLUME1))
+ die("failure: btrfs_create_subvolume");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1, 0, 0, 0))
+ die("failure: expected_uid_gid");
+
+ subvolume_fd = openat(tree_fd, BTRFS_SUBVOLUME1,
+ O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fd < 0)
+ die("failure: openat");
+
+ /* create read-write snapshot */
+ if (btrfs_create_snapshot(subvolume_fd, tree_fd,
+ BTRFS_SUBVOLUME1_SNAPSHOT1, 0))
+ die("failure: btrfs_create_snapshot");
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1, 0, 0, 0))
+ die("failure: expected_uid_gid");
+
+ snapshot_fd = openat(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1,
+ O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (snapshot_fd < 0)
+ die("failure: openat");
+
+ if (btrfs_get_subvolume_ro(snapshot_fd, &read_only))
+ die("failure: btrfs_get_subvolume_ro");
+
+ if (read_only)
+ die("failure: read_only");
+
+ if (btrfs_set_subvolume_ro(snapshot_fd, true))
+ die("failure: btrfs_set_subvolume_ro");
+
+ if (btrfs_get_subvolume_ro(snapshot_fd, &read_only))
+ die("failure: btrfs_get_subvolume_ro");
+
+ if (!read_only)
+ die("failure: not read_only");
+
+ if (btrfs_set_subvolume_ro(snapshot_fd, false))
+ die("failure: btrfs_set_subvolume_ro");
+
+ if (btrfs_get_subvolume_ro(snapshot_fd, &read_only))
+ die("failure: btrfs_get_subvolume_ro");
+
+ if (read_only)
+ die("failure: read_only");
+
+ safe_close(snapshot_fd);
+ safe_close(subvolume_fd);
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ /* remove directory */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1)) {
+ log_stderr("failure: btrfs_delete_subvolume");
+ goto out;
+ }
+
+ /* remove directory */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1)) {
+ log_stderr("failure: btrfs_delete_subvolume");
+ goto out;
+ }
+
+ fret = 0;
+ log_debug("Ran test");
+out:
+ safe_close(attr.userns_fd);
+ safe_close(open_tree_fd);
+ safe_close(tree_fd);
+
+ return fret;
+}
+
+static int btrfs_snapshots_setflags_fsids_unmapped(void)
+{
+ int fret = -1;
+ int open_tree_fd = -EBADF, subvolume_fd = -EBADF, tree_fd = -EBADF;
+ struct mount_attr attr = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ };
+ pid_t pid;
+
+ if (!caps_supported())
+ return 0;
+
+ /* Changing mount properties on a detached mount. */
+ attr.userns_fd = get_userns_fd(0, 10000, 10000);
+ if (attr.userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ open_tree_fd = sys_open_tree(t_dir1_fd, "",
+ AT_EMPTY_PATH |
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (open_tree_fd < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ if (sys_mount_setattr(open_tree_fd, "", AT_EMPTY_PATH, &attr, sizeof(attr))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ /*
+ * The open_tree() syscall returns an O_PATH file descriptor which we
+ * can't use with ioctl(). So let's reopen it as a proper file
+ * descriptor.
+ */
+ tree_fd = openat(open_tree_fd, ".", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (tree_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ /* create subvolume */
+ if (btrfs_create_subvolume(t_dir1_fd, BTRFS_SUBVOLUME1)) {
+ log_stderr("failure: btrfs_create_subvolume");
+ goto out;
+ }
+
+ if (!expected_uid_gid(t_dir1_fd, BTRFS_SUBVOLUME1, 0, 0, 0)) {
+ log_stderr("failure: expected_uid_gid");
+ goto out;
+ }
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1, 0, 10000, 10000)) {
+ log_stderr("failure: expected_uid_gid");
+ goto out;
+ }
+
+ subvolume_fd = openat(t_dir1_fd, BTRFS_SUBVOLUME1,
+ O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ /* create read-write snapshot */
+ if (btrfs_create_snapshot(subvolume_fd, t_dir1_fd,
+ BTRFS_SUBVOLUME1_SNAPSHOT1, 0)) {
+ log_stderr("failure: btrfs_create_snapshot");
+ goto out;
+ }
+
+ if (!expected_uid_gid(t_dir1_fd, BTRFS_SUBVOLUME1_SNAPSHOT1, 0, 0, 0)) {
+ log_stderr("failure: expected_uid_gid");
+ goto out;
+ }
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1, 0, 10000, 10000)) {
+ log_stderr("failure: expected_uid_gid");
+ goto out;
+ }
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ int snapshot_fd = -EBADF;
+ bool read_only = false;
+
+ snapshot_fd = openat(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1,
+ O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (snapshot_fd < 0)
+ die("failure: openat");
+
+ if (!switch_fsids(0, 0))
+ die("failure: switch fsids");
+
+ if (!caps_down())
+ die("failure: raise caps");
+
+ /*
+ * The caller's fsids don't have mappings in the idmapped mount
+ * so any file creation must fail.
+ */
+
+ if (btrfs_get_subvolume_ro(snapshot_fd, &read_only))
+ die("failure: btrfs_get_subvolume_ro");
+
+ if (read_only)
+ die("failure: read_only");
+
+ if (!btrfs_set_subvolume_ro(snapshot_fd, true))
+ die("failure: btrfs_set_subvolume_ro");
+ if (errno != EPERM)
+ die("failure: errno");
+
+ safe_close(snapshot_fd);
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ /* remove directory */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1)) {
+ log_stderr("failure: btrfs_delete_subvolume");
+ goto out;
+ }
+
+ /* remove directory */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1)) {
+ log_stderr("failure: btrfs_delete_subvolume");
+ goto out;
+ }
+
+ fret = 0;
+ log_debug("Ran test");
+out:
+ safe_close(attr.userns_fd);
+ safe_close(open_tree_fd);
+ safe_close(subvolume_fd);
+ safe_close(tree_fd);
+
+ return fret;
+}
+
+static int btrfs_snapshots_setflags_fsids_unmapped_userns(void)
+{
+ int fret = -1;
+ int open_tree_fd = -EBADF, subvolume_fd = -EBADF, tree_fd = -EBADF,
+ userns_fd = -EBADF;
+ struct mount_attr attr = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ };
+ pid_t pid;
+
+ if (!caps_supported())
+ return 0;
+
+ /* Changing mount properties on a detached mount. */
+ attr.userns_fd = get_userns_fd(0, 10000, 10000);
+ if (attr.userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ /* Changing mount properties on a detached mount. */
+ userns_fd = get_userns_fd(0, 30000, 10000);
+ if (userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ open_tree_fd = sys_open_tree(t_dir1_fd, "",
+ AT_EMPTY_PATH |
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (open_tree_fd < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ if (sys_mount_setattr(open_tree_fd, "", AT_EMPTY_PATH, &attr, sizeof(attr))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ /*
+ * The open_tree() syscall returns an O_PATH file descriptor which we
+ * can't use with ioctl(). So let's reopen it as a proper file
+ * descriptor.
+ */
+ tree_fd = openat(open_tree_fd, ".", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (tree_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ /* create subvolume */
+ if (btrfs_create_subvolume(t_dir1_fd, BTRFS_SUBVOLUME1)) {
+ log_stderr("failure: btrfs_create_subvolume");
+ goto out;
+ }
+
+ if (!expected_uid_gid(t_dir1_fd, BTRFS_SUBVOLUME1, 0, 0, 0)) {
+ log_stderr("failure: expected_uid_gid");
+ goto out;
+ }
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1, 0, 10000, 10000)) {
+ log_stderr("failure: expected_uid_gid");
+ goto out;
+ }
+
+ subvolume_fd = openat(t_dir1_fd, BTRFS_SUBVOLUME1,
+ O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ /* create read-write snapshot */
+ if (btrfs_create_snapshot(subvolume_fd, t_dir1_fd,
+ BTRFS_SUBVOLUME1_SNAPSHOT1, 0)) {
+ log_stderr("failure: btrfs_create_snapshot");
+ goto out;
+ }
+
+ if (!expected_uid_gid(t_dir1_fd, BTRFS_SUBVOLUME1_SNAPSHOT1, 0, 0, 0)) {
+ log_stderr("failure: expected_uid_gid");
+ goto out;
+ }
+
+ if (!expected_uid_gid(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1, 0, 10000, 10000)) {
+ log_stderr("failure: expected_uid_gid");
+ goto out;
+ }
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ int snapshot_fd = -EBADF;
+ bool read_only = false;
+
+ /*
+ * The caller's fsids don't have mappings in the idmapped mount
+ * so any file creation must fail.
+ */
+
+ snapshot_fd = openat(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1,
+ O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (snapshot_fd < 0)
+ die("failure: openat");
+
+
+ if (!switch_userns(userns_fd, 0, 0, false))
+ die("failure: switch_userns");
+
+ if (!expected_uid_gid(t_dir1_fd, BTRFS_SUBVOLUME1, 0,
+ t_overflowuid, t_overflowgid))
+ die("failure: expected_uid_gid");
+
+ if (!expected_uid_gid(open_tree_fd, BTRFS_SUBVOLUME1, 0,
+ t_overflowuid, t_overflowgid))
+ die("failure: expected_uid_gid");
+
+ /*
+ * The caller's fsids don't have mappings in the idmapped mount
+ * so any file creation must fail.
+ */
+
+ if (btrfs_get_subvolume_ro(snapshot_fd, &read_only))
+ die("failure: btrfs_get_subvolume_ro");
+
+ if (read_only)
+ die("failure: read_only");
+
+ if (!btrfs_set_subvolume_ro(snapshot_fd, true))
+ die("failure: btrfs_set_subvolume_ro");
+ if (errno != EPERM)
+ die("failure: errno");
+
+ safe_close(snapshot_fd);
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ /* remove directory */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1)) {
+ log_stderr("failure: btrfs_delete_subvolume");
+ goto out;
+ }
+
+ /* remove directory */
+ if (btrfs_delete_subvolume(tree_fd, BTRFS_SUBVOLUME1_SNAPSHOT1)) {
+ log_stderr("failure: btrfs_delete_subvolume");
+ goto out;
+ }
+
+ fret = 0;
+ log_debug("Ran test");
+out:
+ safe_close(attr.userns_fd);
+ safe_close(open_tree_fd);
+ safe_close(subvolume_fd);
+ safe_close(tree_fd);
+ safe_close(userns_fd);
+
+ return fret;
+}
+
+#define BTRFS_SUBVOLUME_SUBVOL1 "subvol1"
+#define BTRFS_SUBVOLUME_SUBVOL2 "subvol2"
+#define BTRFS_SUBVOLUME_SUBVOL3 "subvol3"
+#define BTRFS_SUBVOLUME_SUBVOL4 "subvol4"
+
+#define BTRFS_SUBVOLUME_SUBVOL1_ID 0
+#define BTRFS_SUBVOLUME_SUBVOL2_ID 1
+#define BTRFS_SUBVOLUME_SUBVOL3_ID 2
+#define BTRFS_SUBVOLUME_SUBVOL4_ID 3
+
+#define BTRFS_SUBVOLUME_DIR1 "dir1"
+#define BTRFS_SUBVOLUME_DIR2 "dir2"
+
+#define BTRFS_SUBVOLUME_MNT "mnt_subvolume1"
+
+#define BTRFS_SUBVOLUME_SUBVOL1xSUBVOL3 "subvol1/subvol3"
+#define BTRFS_SUBVOLUME_SUBVOL1xDIR1xDIR2 "subvol1/dir1/dir2"
+#define BTRFS_SUBVOLUME_SUBVOL1xDIR1xDIR2xSUBVOL4 "subvol1/dir1/dir2/subvol4"
+
+/*
+ * We create the following mount layout to test lookup:
+ *
+ * |-/mnt/test /dev/loop0 btrfs rw,relatime,space_cache,subvolid=5,subvol=/
+ * | |-/mnt/test/mnt1 /dev/loop1[/subvol1] btrfs rw,relatime,space_cache,user_subvol_rm_allowed,subvolid=268,subvol=/subvol1
+ * '-/mnt/scratch /dev/loop1 btrfs rw,relatime,space_cache,user_subvol_rm_allowed,subvolid=5,subvol=/
+ */
+static int btrfs_subvolume_lookup_user(void)
+{
+ int fret = -1;
+ int dir1_fd = -EBADF, dir2_fd = -EBADF, mnt_fd = -EBADF,
+ open_tree_fd = -EBADF, tree_fd = -EBADF, userns_fd = -EBADF;
+ int subvolume_fds[BTRFS_SUBVOLUME_SUBVOL4_ID + 1];
+ uint64_t subvolume_ids[BTRFS_SUBVOLUME_SUBVOL4_ID + 1];
+ uint64_t subvolid = -EINVAL;
+ struct mount_attr attr = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ };
+ pid_t pid;
+ struct btrfs_iter *iter;
+
+ if (!caps_supported())
+ return 0;
+
+ for (int i = 0; i < ARRAY_SIZE(subvolume_fds); i++)
+ subvolume_fds[i] = -EBADF;
+
+ for (int i = 0; i < ARRAY_SIZE(subvolume_ids); i++)
+ subvolume_ids[i] = -EINVAL;
+
+ if (btrfs_create_subvolume(t_mnt_scratch_fd, BTRFS_SUBVOLUME_SUBVOL1)) {
+ log_stderr("failure: btrfs_create_subvolume");
+ goto out;
+ }
+
+ if (btrfs_create_subvolume(t_mnt_scratch_fd, BTRFS_SUBVOLUME_SUBVOL2)) {
+ log_stderr("failure: btrfs_create_subvolume");
+ goto out;
+ }
+
+ subvolume_fds[BTRFS_SUBVOLUME_SUBVOL1_ID] = openat(t_mnt_scratch_fd,
+ BTRFS_SUBVOLUME_SUBVOL1,
+ O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fds[BTRFS_SUBVOLUME_SUBVOL1_ID] < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ /* create subvolume */
+ if (btrfs_create_subvolume(subvolume_fds[BTRFS_SUBVOLUME_SUBVOL1_ID], BTRFS_SUBVOLUME_SUBVOL3)) {
+ log_stderr("failure: btrfs_create_subvolume");
+ goto out;
+ }
+
+ if (mkdirat(subvolume_fds[BTRFS_SUBVOLUME_SUBVOL1_ID], BTRFS_SUBVOLUME_DIR1, 0777)) {
+ log_stderr("failure: mkdirat");
+ goto out;
+ }
+
+ dir1_fd = openat(subvolume_fds[BTRFS_SUBVOLUME_SUBVOL1_ID], BTRFS_SUBVOLUME_DIR1,
+ O_CLOEXEC | O_DIRECTORY);
+ if (dir1_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ if (mkdirat(dir1_fd, BTRFS_SUBVOLUME_DIR2, 0777)) {
+ log_stderr("failure: mkdirat");
+ goto out;
+ }
+
+ dir2_fd = openat(dir1_fd, BTRFS_SUBVOLUME_DIR2, O_CLOEXEC | O_DIRECTORY);
+ if (dir2_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ if (btrfs_create_subvolume(dir2_fd, BTRFS_SUBVOLUME_SUBVOL4)) {
+ log_stderr("failure: btrfs_create_subvolume");
+ goto out;
+ }
+
+ if (mkdirat(t_mnt_fd, BTRFS_SUBVOLUME_MNT, 0777)) {
+ log_stderr("failure: mkdirat");
+ goto out;
+ }
+
+ snprintf(t_buf, sizeof(t_buf), "%s/%s", t_mountpoint, BTRFS_SUBVOLUME_MNT);
+ if (sys_mount(t_device_scratch, t_buf, "btrfs", 0,
+ "subvol=" BTRFS_SUBVOLUME_SUBVOL1)) {
+ log_stderr("failure: mount");
+ goto out;
+ }
+
+ mnt_fd = openat(t_mnt_fd, BTRFS_SUBVOLUME_MNT, O_CLOEXEC | O_DIRECTORY);
+ if (mnt_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ if (chown_r(t_mnt_scratch_fd, ".", 1000, 1000)) {
+ log_stderr("failure: chown_r");
+ goto out;
+ }
+
+ subvolume_fds[BTRFS_SUBVOLUME_SUBVOL2_ID] = openat(t_mnt_scratch_fd,
+ BTRFS_SUBVOLUME_SUBVOL2,
+ O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fds[BTRFS_SUBVOLUME_SUBVOL2_ID] < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ if (btrfs_get_subvolume_id(subvolume_fds[BTRFS_SUBVOLUME_SUBVOL1_ID],
+ &subvolume_ids[BTRFS_SUBVOLUME_SUBVOL1_ID])) {
+ log_stderr("failure: btrfs_get_subvolume_id");
+ goto out;
+ }
+
+ if (btrfs_get_subvolume_id(subvolume_fds[BTRFS_SUBVOLUME_SUBVOL2_ID],
+ &subvolume_ids[BTRFS_SUBVOLUME_SUBVOL2_ID])) {
+ log_stderr("failure: btrfs_get_subvolume_id");
+ goto out;
+ }
+
+ subvolume_fds[BTRFS_SUBVOLUME_SUBVOL3_ID] = openat(t_mnt_scratch_fd,
+ BTRFS_SUBVOLUME_SUBVOL1xSUBVOL3,
+ O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fds[BTRFS_SUBVOLUME_SUBVOL3_ID] < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ if (btrfs_get_subvolume_id(subvolume_fds[BTRFS_SUBVOLUME_SUBVOL3_ID],
+ &subvolume_ids[BTRFS_SUBVOLUME_SUBVOL3_ID])) {
+ log_stderr("failure: btrfs_get_subvolume_id");
+ goto out;
+ }
+
+ subvolume_fds[BTRFS_SUBVOLUME_SUBVOL4_ID] = openat(t_mnt_scratch_fd,
+ BTRFS_SUBVOLUME_SUBVOL1xDIR1xDIR2xSUBVOL4,
+ O_CLOEXEC | O_DIRECTORY);
+ if (subvolume_fds[BTRFS_SUBVOLUME_SUBVOL4_ID] < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ if (btrfs_get_subvolume_id(subvolume_fds[BTRFS_SUBVOLUME_SUBVOL4_ID],
+ &subvolume_ids[BTRFS_SUBVOLUME_SUBVOL4_ID])) {
+ log_stderr("failure: btrfs_get_subvolume_id");
+ goto out;
+ }
+
+
+ if (fchmod(subvolume_fds[BTRFS_SUBVOLUME_SUBVOL3_ID], S_IRUSR | S_IWUSR | S_IXUSR), 0) {
+ log_stderr("failure: fchmod");
+ goto out;
+ }
+
+ if (fchmod(subvolume_fds[BTRFS_SUBVOLUME_SUBVOL4_ID], S_IRUSR | S_IWUSR | S_IXUSR), 0) {
+ log_stderr("failure: fchmod");
+ goto out;
+ }
+
+ attr.userns_fd = get_userns_fd(0, 10000, 10000);
+ if (attr.userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ open_tree_fd = sys_open_tree(mnt_fd, "",
+ AT_EMPTY_PATH |
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (open_tree_fd < 0) {
+ log_stderr("failure: sys_open_tree");
+ goto out;
+ }
+
+ if (sys_mount_setattr(open_tree_fd, "", AT_EMPTY_PATH, &attr, sizeof(attr))) {
+ log_stderr("failure: sys_mount_setattr");
+ goto out;
+ }
+
+ /*
+ * The open_tree() syscall returns an O_PATH file descriptor which we
+ * can't use with ioctl(). So let's reopen it as a proper file
+ * descriptor.
+ */
+ tree_fd = openat(open_tree_fd, ".", O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+ if (tree_fd < 0) {
+ log_stderr("failure: openat");
+ goto out;
+ }
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ bool subvolume3_found = false, subvolume4_found = false;
+
+ if (!switch_fsids(11000, 11000))
+ die("failure: switch fsids");
+
+ if (!caps_down())
+ die("failure: lower caps");
+
+ if (btrfs_iterator_start(tree_fd, 0, &iter))
+ die("failure: btrfs_iterator_start");
+
+ for (;;) {
+ char *subvol_path = NULL;
+ int ret;
+
+ ret = btrfs_iterator_next(iter, &subvol_path, &subvolid);
+ if (ret == 1)
+ break;
+ else if (ret)
+ die("failure: btrfs_iterator_next");
+
+ if (subvolid != subvolume_ids[BTRFS_SUBVOLUME_SUBVOL3_ID] &&
+ subvolid != subvolume_ids[BTRFS_SUBVOLUME_SUBVOL4_ID])
+ die("failure: subvolume id %llu->%s",
+ (long long unsigned)subvolid, subvol_path);
+
+ if (subvolid == subvolume_ids[BTRFS_SUBVOLUME_SUBVOL3_ID])
+ subvolume3_found = true;
+
+ if (subvolid == subvolume_ids[BTRFS_SUBVOLUME_SUBVOL4_ID])
+ subvolume4_found = true;
+
+ free(subvol_path);
+ }
+ btrfs_iterator_end(iter);
+
+ if (!subvolume3_found || !subvolume4_found)
+ die("failure: subvolume id");
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ bool subvolume3_found = false, subvolume4_found = false;
+
+ if (!switch_userns(attr.userns_fd, 0, 0, false))
+ die("failure: switch_userns");
+
+ if (btrfs_iterator_start(tree_fd, 0, &iter))
+ die("failure: btrfs_iterator_start");
+
+ for (;;) {
+ char *subvol_path = NULL;
+ int ret;
+
+ ret = btrfs_iterator_next(iter, &subvol_path, &subvolid);
+ if (ret == 1)
+ break;
+ else if (ret)
+ die("failure: btrfs_iterator_next");
+
+ if (subvolid != subvolume_ids[BTRFS_SUBVOLUME_SUBVOL3_ID] &&
+ subvolid != subvolume_ids[BTRFS_SUBVOLUME_SUBVOL4_ID])
+ die("failure: subvolume id %llu->%s",
+ (long long unsigned)subvolid, subvol_path);
+
+ if (subvolid == subvolume_ids[BTRFS_SUBVOLUME_SUBVOL3_ID])
+ subvolume3_found = true;
+
+ if (subvolid == subvolume_ids[BTRFS_SUBVOLUME_SUBVOL4_ID])
+ subvolume4_found = true;
+
+ free(subvol_path);
+ }
+ btrfs_iterator_end(iter);
+
+ if (!subvolume3_found || !subvolume4_found)
+ die("failure: subvolume id");
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ bool subvolume_found = false;
+
+ if (!switch_fsids(0, 0))
+ die("failure: switch fsids");
+
+ if (!caps_down())
+ die("failure: lower caps");
+
+ if (btrfs_iterator_start(tree_fd, 0, &iter))
+ die("failure: btrfs_iterator_start");
+
+ for (;;) {
+ char *subvol_path = NULL;
+ int ret;
+
+ ret = btrfs_iterator_next(iter, &subvol_path, &subvolid);
+ if (ret == 1)
+ break;
+ else if (ret)
+ die("failure: btrfs_iterator_next");
+
+ free(subvol_path);
+
+ subvolume_found = true;
+ break;
+ }
+ btrfs_iterator_end(iter);
+
+ if (subvolume_found)
+ die("failure: subvolume id");
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ userns_fd = get_userns_fd(0, 30000, 10000);
+ if (userns_fd < 0) {
+ log_stderr("failure: get_userns_fd");
+ goto out;
+ }
+
+ pid = fork();
+ if (pid < 0) {
+ log_stderr("failure: fork");
+ goto out;
+ }
+ if (pid == 0) {
+ bool subvolume_found = false;
+
+ if (!switch_userns(userns_fd, 0, 0, true))
+ die("failure: switch_userns");
+
+ if (btrfs_iterator_start(tree_fd, 0, &iter))
+ die("failure: btrfs_iterator_start");
+
+ for (;;) {
+ char *subvol_path = NULL;
+ int ret;
+
+ ret = btrfs_iterator_next(iter, &subvol_path, &subvolid);
+ if (ret == 1)
+ break;
+ else if (ret)
+ die("failure: btrfs_iterator_next");
+
+ free(subvol_path);
+
+ subvolume_found = true;
+ break;
+ }
+ btrfs_iterator_end(iter);
+
+ if (subvolume_found)
+ die("failure: subvolume id");
+
+ exit(EXIT_SUCCESS);
+ }
+ if (wait_for_pid(pid))
+ goto out;
+
+ fret = 0;
+ log_debug("Ran test");
+out:
+ safe_close(dir1_fd);
+ safe_close(dir2_fd);
+ safe_close(open_tree_fd);
+ safe_close(tree_fd);
+ safe_close(userns_fd);
+ for (int i = 0; i < ARRAY_SIZE(subvolume_fds); i++)
+ safe_close(subvolume_fds[i]);
+ snprintf(t_buf, sizeof(t_buf), "%s/%s", t_mountpoint, BTRFS_SUBVOLUME_MNT);
+ sys_umount2(t_buf, MNT_DETACH);
+ unlinkat(t_mnt_fd, BTRFS_SUBVOLUME_MNT, AT_REMOVEDIR);
+
+ return fret;
+}
+
+static void usage(void)
+{
+ fprintf(stderr, "Description:\n");
+ fprintf(stderr, " Run idmapped mount tests\n\n");
+
+ fprintf(stderr, "Arguments:\n");
+ fprintf(stderr, "--device Device used in the tests\n");
+ fprintf(stderr, "--fstype Filesystem type used in the tests\n");
+ fprintf(stderr, "--help Print help\n");
+ fprintf(stderr, "--mountpoint Mountpoint of device\n");
+ fprintf(stderr, "--supported Test whether idmapped mounts are supported on this filesystem\n");
+ fprintf(stderr, "--scratch-mountpoint Mountpoint of scratch device used in the tests\n");
+ fprintf(stderr, "--scratch-device Scratch device used in the tests\n");
+ fprintf(stderr, "--test-core Run core idmapped mount testsuite\n");
+ fprintf(stderr, "--test-fscaps-regression Run fscap regression tests\n");
+ fprintf(stderr, "--test-nested-userns Run nested userns idmapped mount testsuite\n");
+ fprintf(stderr, "--test-btrfs Run btrfs specific idmapped mount testsuite\n");
+
+ _exit(EXIT_SUCCESS);
+}
+
+static const struct option longopts[] = {
+ {"device", required_argument, 0, 'd'},
+ {"fstype", required_argument, 0, 'f'},
+ {"mountpoint", required_argument, 0, 'm'},
+ {"scratch-mountpoint", required_argument, 0, 'a'},
+ {"scratch-device", required_argument, 0, 'e'},
+ {"supported", no_argument, 0, 's'},
+ {"help", no_argument, 0, 'h'},
+ {"test-core", no_argument, 0, 'c'},
+ {"test-fscaps-regression", no_argument, 0, 'g'},
+ {"test-nested-userns", no_argument, 0, 'n'},
+ {"test-btrfs", no_argument, 0, 'b'},
+ {NULL, 0, 0, 0},
+};
+
+struct t_idmapped_mounts {
+ int (*test)(void);
+ const char *description;
+} basic_suite[] = {
+ { acls, "posix acls on regular mounts", },
+ { create_in_userns, "create operations in user namespace", },
+ { device_node_in_userns, "device node in user namespace", },
+ { expected_uid_gid_idmapped_mounts, "expected ownership on idmapped mounts", },
+ { fscaps, "fscaps on regular mounts", },
+ { fscaps_idmapped_mounts, "fscaps on idmapped mounts", },
+ { fscaps_idmapped_mounts_in_userns, "fscaps on idmapped mounts in user namespace", },
+ { fscaps_idmapped_mounts_in_userns_separate_userns, "fscaps on idmapped mounts in user namespace with different id mappings", },
+ { fsids_mapped, "mapped fsids", },
+ { fsids_unmapped, "unmapped fsids", },
+ { hardlink_crossing_mounts, "cross mount hardlink", },
+ { hardlink_crossing_idmapped_mounts, "cross idmapped mount hardlink", },
+ { hardlink_from_idmapped_mount, "hardlinks from idmapped mounts", },
+ { hardlink_from_idmapped_mount_in_userns, "hardlinks from idmapped mounts in user namespace", },
+#ifdef HAVE_LIBURING_H
+ { io_uring, "io_uring", },
+ { io_uring_userns, "io_uring in user namespace", },
+ { io_uring_idmapped, "io_uring from idmapped mounts", },
+ { io_uring_idmapped_userns, "io_uring from idmapped mounts in user namespace", },
+ { io_uring_idmapped_unmapped, "io_uring from idmapped mounts with unmapped ids", },
+ { io_uring_idmapped_unmapped_userns, "io_uring from idmapped mounts with unmapped ids in user namespace", },
+#endif
+ { protected_symlinks, "following protected symlinks on regular mounts", },
+ { protected_symlinks_idmapped_mounts, "following protected symlinks on idmapped mounts", },
+ { protected_symlinks_idmapped_mounts_in_userns, "following protected symlinks on idmapped mounts in user namespace", },
+ { rename_crossing_mounts, "cross mount rename", },
+ { rename_crossing_idmapped_mounts, "cross idmapped mount rename", },
+ { rename_from_idmapped_mount, "rename from idmapped mounts", },
+ { rename_from_idmapped_mount_in_userns, "rename from idmapped mounts in user namespace", },
+ { setattr_truncate, "setattr truncate", },
+ { setattr_truncate_idmapped, "setattr truncate on idmapped mounts", },
+ { setattr_truncate_idmapped_in_userns, "setattr truncate on idmapped mounts in user namespace", },
+ { setgid_create, "create operations in directories with setgid bit set", },
+ { setgid_create_idmapped, "create operations in directories with setgid bit set on idmapped mounts", },
+ { setgid_create_idmapped_in_userns, "create operations in directories with setgid bit set on idmapped mounts in user namespace", },
+ { setid_binaries, "setid binaries on regular mounts", },
+ { setid_binaries_idmapped_mounts, "setid binaries on idmapped mounts", },
+ { setid_binaries_idmapped_mounts_in_userns, "setid binaries on idmapped mounts in user namespace", },
+ { setid_binaries_idmapped_mounts_in_userns_separate_userns, "setid binaries on idmapped mounts in user namespace with different id mappings", },
+ { sticky_bit_unlink, "sticky bit unlink operations on regular mounts", },
+ { sticky_bit_unlink_idmapped_mounts, "sticky bit unlink operations on idmapped mounts", },
+ { sticky_bit_unlink_idmapped_mounts_in_userns, "sticky bit unlink operations on idmapped mounts in user namespace", },
+ { sticky_bit_rename, "sticky bit rename operations on regular mounts", },
+ { sticky_bit_rename_idmapped_mounts, "sticky bit rename operations on idmapped mounts", },
+ { sticky_bit_rename_idmapped_mounts_in_userns, "sticky bit rename operations on idmapped mounts in user namespace", },
+ { symlink_regular_mounts, "symlink from regular mounts", },
+ { symlink_idmapped_mounts, "symlink from idmapped mounts", },
+ { symlink_idmapped_mounts_in_userns, "symlink from idmapped mounts in user namespace", },
+ { threaded_idmapped_mount_interactions, "threaded operations on idmapped mounts", },
+};
+
+struct t_idmapped_mounts fscaps_in_ancestor_userns[] = {
+ { fscaps_idmapped_mounts_in_userns_valid_in_ancestor_userns, "fscaps on idmapped mounts in user namespace writing fscap valid in ancestor userns", },
+};
+
+struct t_idmapped_mounts t_nested_userns[] = {
+ { nested_userns, "test that nested user namespaces behave correctly when attached to idmapped mounts", },
+};
+
+struct t_idmapped_mounts t_btrfs[] = {
+ { btrfs_subvolumes_fsids_mapped, "test subvolumes with mapped fsids", },
+ { btrfs_subvolumes_fsids_mapped_userns, "test subvolumes with mapped fsids inside user namespace", },
+ { btrfs_subvolumes_fsids_mapped_user_subvol_rm_allowed, "test subvolume deletion with user_subvol_rm_allowed mount option", },
+ { btrfs_subvolumes_fsids_mapped_userns_user_subvol_rm_allowed, "test subvolume deletion with user_subvol_rm_allowed mount option inside user namespace", },
+ { btrfs_subvolumes_fsids_unmapped, "test subvolumes with unmapped fsids", },
+ { btrfs_subvolumes_fsids_unmapped_userns, "test subvolumes with unmapped fsids inside user namespace", },
+ { btrfs_snapshots_fsids_mapped, "test snapshots with mapped fsids", },
+ { btrfs_snapshots_fsids_mapped_userns, "test snapshots with mapped fsids inside user namespace", },
+ { btrfs_snapshots_fsids_mapped_user_subvol_rm_allowed, "test snapshots deletion with user_subvol_rm_allowed mount option", },
+ { btrfs_snapshots_fsids_mapped_userns_user_subvol_rm_allowed, "test snapshots deletion with user_subvol_rm_allowed mount option inside user namespace", },
+ { btrfs_snapshots_fsids_unmapped, "test snapshots with unmapped fsids", },
+ { btrfs_snapshots_fsids_unmapped_userns, "test snapshots with unmapped fsids inside user namespace", },
+ { btrfs_delete_by_spec_id, "test subvolume deletion by spec id", },
+ { btrfs_subvolumes_setflags_fsids_mapped, "test subvolume flags with mapped fsids", },
+ { btrfs_subvolumes_setflags_fsids_mapped_userns, "test subvolume flags with mapped fsids inside user namespace", },
+ { btrfs_subvolumes_setflags_fsids_unmapped, "test subvolume flags with unmapped fsids", },
+ { btrfs_subvolumes_setflags_fsids_unmapped_userns, "test subvolume flags with unmapped fsids inside user namespace", },
+ { btrfs_snapshots_setflags_fsids_mapped, "test snapshots flags with mapped fsids", },
+ { btrfs_snapshots_setflags_fsids_mapped_userns, "test snapshots flags with mapped fsids inside user namespace", },
+ { btrfs_snapshots_setflags_fsids_unmapped, "test snapshots flags with unmapped fsids", },
+ { btrfs_snapshots_setflags_fsids_unmapped_userns, "test snapshots flags with unmapped fsids inside user namespace", },
+ { btrfs_subvolume_lookup_user, "test unprivileged subvolume lookup", },
+};
+
+static bool run_test(struct t_idmapped_mounts suite[], size_t suite_size)
+{
+ int i;
+
+ for (i = 0; i < suite_size; i++) {
+ struct t_idmapped_mounts *t = &suite[i];
+ int ret;
+ pid_t pid;
+
+ test_setup();
+
+ pid = fork();
+ if (pid < 0)
+ return false;
+
+ if (pid == 0) {
+ ret = t->test();
+ if (ret)
+ die("failure: %s", t->description);
+
+ exit(EXIT_SUCCESS);
+ }
+
+ ret = wait_for_pid(pid);
+ test_cleanup();
+
+ if (ret)
+ return false;
+ }
+
+ return true;
+}
+
+int main(int argc, char *argv[])
+{
+ int fret, ret;
+ int index = 0;
+ bool supported = false, test_btrfs = false, test_core = false,
+ test_fscaps_regression = false, test_nested_userns = false;
+
+ while ((ret = getopt_long_only(argc, argv, "", longopts, &index)) != -1) {
+ switch (ret) {
+ case 'd':
+ t_device = optarg;
+ break;
+ case 'f':
+ t_fstype = optarg;
+ break;
+ case 'm':
+ t_mountpoint = optarg;
+ break;
+ case 's':
+ supported = true;
+ break;
+ case 'c':
+ test_core = true;
+ break;
+ case 'g':
+ test_fscaps_regression = true;
+ break;
+ case 'n':
+ test_nested_userns = true;
+ break;
+ case 'b':
+ test_btrfs = true;
+ break;
+ case 'a':
+ t_mountpoint_scratch = optarg;
+ break;
+ case 'e':
+ t_device_scratch = optarg;
+ break;
+ case 'h':
+ /* fallthrough */
+ default:
+ usage();
+ }
+ }
+
+ if (!t_device)
+ die_errno(EINVAL, "test device missing");
+
+ if (!t_fstype)
+ die_errno(EINVAL, "test filesystem type missing");
+
+ if (!t_mountpoint)
+ die_errno(EINVAL, "mountpoint of test device missing");
+
+ /* create separate mount namespace */
+ if (unshare(CLONE_NEWNS))
+ die("failure: create new mount namespace");
+
+ /* turn off mount propagation */
+ if (sys_mount(NULL, "/", NULL, MS_REC | MS_PRIVATE, 0))
+ die("failure: turn mount propagation off");
+
+ t_mnt_fd = openat(-EBADF, t_mountpoint, O_CLOEXEC | O_DIRECTORY);
+ if (t_mnt_fd < 0)
+ die("failed to open %s", t_mountpoint);
+
+ t_mnt_scratch_fd = openat(-EBADF, t_mountpoint_scratch, O_CLOEXEC | O_DIRECTORY);
+ if (t_mnt_fd < 0)
+ die("failed to open %s", t_mountpoint_scratch);
+
+ /*
+ * Caller just wants to know whether the filesystem we're on supports
+ * idmapped mounts.
+ */
+ if (supported) {
+ int open_tree_fd = -EBADF;
+ struct mount_attr attr = {
+ .attr_set = MOUNT_ATTR_IDMAP,
+ .userns_fd = -EBADF,
+ };
+
+ /* Changing mount properties on a detached mount. */
+ attr.userns_fd = get_userns_fd(0, 1000, 1);
+ if (attr.userns_fd < 0)
+ exit(EXIT_FAILURE);
+
+ open_tree_fd = sys_open_tree(t_mnt_fd, "",
+ AT_EMPTY_PATH |
+ AT_NO_AUTOMOUNT |
+ AT_SYMLINK_NOFOLLOW |
+ OPEN_TREE_CLOEXEC |
+ OPEN_TREE_CLONE);
+ if (open_tree_fd < 0)
+ ret = -1;
+ else
+ ret = sys_mount_setattr(open_tree_fd, "", AT_EMPTY_PATH, &attr, sizeof(attr));
+
+ close(open_tree_fd);
+ close(attr.userns_fd);
+
+ if (ret)
+ exit(EXIT_FAILURE);
+
+ exit(EXIT_SUCCESS);
+ }
+
+ stash_overflowuid();
+ stash_overflowgid();
+
+ fret = EXIT_FAILURE;
+
+ if (test_core && !run_test(basic_suite, ARRAY_SIZE(basic_suite)))
+ goto out;
+
+ if (test_fscaps_regression &&
+ !run_test(fscaps_in_ancestor_userns,
+ ARRAY_SIZE(fscaps_in_ancestor_userns)))
+ goto out;
+
+ if (test_nested_userns &&
+ !run_test(t_nested_userns, ARRAY_SIZE(t_nested_userns)))
+ goto out;
+
+ if (test_btrfs && !run_test(t_btrfs, ARRAY_SIZE(t_btrfs)))
goto out;
fret = EXIT_SUCCESS;
projects / xfstests-dev.git / blobdiff