diff options
Diffstat (limited to '')
-rw-r--r-- | debian/patches/rm-rf-refactor-rm_rf_children-split-out-body-of-directory.patch | 320 |
1 files changed, 320 insertions, 0 deletions
diff --git a/debian/patches/rm-rf-refactor-rm_rf_children-split-out-body-of-directory.patch b/debian/patches/rm-rf-refactor-rm_rf_children-split-out-body-of-directory.patch new file mode 100644 index 0000000..8692c2f --- /dev/null +++ b/debian/patches/rm-rf-refactor-rm_rf_children-split-out-body-of-directory.patch @@ -0,0 +1,320 @@ +From: Lennart Poettering <lennart@poettering.net> +Date: Tue, 26 Jan 2021 16:30:06 +0100 +Subject: rm-rf: refactor rm_rf_children(), + split out body of directory iteration loop + +This splits out rm_rf_children_inner() as body of the loop. We can use +that to implement rm_rf_child() for deleting one specific entry in a +directory. + +(cherry picked from commit 1f0fb7d544711248cba34615e43c5a76bc902d74) +(cherry picked from commit ca4a0e7d41f0b2a1fe2f99dbc3763187c16cf7ab) +(cherry picked from commit 85ccac3393e78d4bf2776ffb8c3a1d8a2a909a2a) +(cherry picked from commit a87d7ff1a60fe359978e12eb34224255a8f33e27) +--- + src/basic/rm-rf.c | 223 +++++++++++++++++++++++++++++++----------------------- + src/basic/rm-rf.h | 3 +- + 2 files changed, 131 insertions(+), 95 deletions(-) + +diff --git a/src/basic/rm-rf.c b/src/basic/rm-rf.c +index 2f2ebc3..f1b8445 100644 +--- a/src/basic/rm-rf.c ++++ b/src/basic/rm-rf.c +@@ -19,6 +19,9 @@ + #include "stat-util.h" + #include "string-util.h" + ++/* We treat tmpfs/ramfs + cgroupfs as non-physical file sytems. cgroupfs is similar to tmpfs in a way after ++ * all: we can create arbitrary directory hierarchies in it, and hence can also use rm_rf() on it to remove ++ * those again. */ + static bool is_physical_fs(const struct statfs *sfs) { + return !is_temporary_fs(sfs) && !is_cgroup_fs(sfs); + } +@@ -112,133 +115,145 @@ static int fstatat_harder( + return 0; + } + +-int rm_rf_children(int fd, RemoveFlags flags, struct stat *root_dev) { +- _cleanup_closedir_ DIR *d = NULL; +- struct dirent *de; +- int ret = 0, r; +- struct statfs sfs; ++static int rm_rf_children_inner( ++ int fd, ++ const char *fname, ++ int is_dir, ++ RemoveFlags flags, ++ const struct stat *root_dev) { + +- assert(fd >= 0); ++ struct stat st; ++ int r; + +- /* This returns the first error we run into, but nevertheless tries to go on. This closes the passed +- * fd, in all cases, including on failure.. */ ++ assert(fd >= 0); ++ assert(fname); + +- if (!(flags & REMOVE_PHYSICAL)) { ++ if (is_dir < 0 || (is_dir > 0 && (root_dev || (flags & REMOVE_SUBVOLUME)))) { + +- r = fstatfs(fd, &sfs); +- if (r < 0) { +- safe_close(fd); +- return -errno; +- } ++ r = fstatat_harder(fd, fname, &st, AT_SYMLINK_NOFOLLOW, flags); ++ if (r < 0) ++ return r; + +- if (is_physical_fs(&sfs)) { +- /* We refuse to clean physical file systems with this call, +- * unless explicitly requested. This is extra paranoia just +- * to be sure we never ever remove non-state data. */ +- _cleanup_free_ char *path = NULL; ++ is_dir = S_ISDIR(st.st_mode); ++ } + +- (void) fd_get_path(fd, &path); +- log_error("Attempted to remove disk file system under \"%s\", and we can't allow that.", +- strna(path)); ++ if (is_dir) { ++ _cleanup_close_ int subdir_fd = -1; ++ int q; + +- safe_close(fd); +- return -EPERM; +- } +- } ++ /* if root_dev is set, remove subdirectories only if device is same */ ++ if (root_dev && st.st_dev != root_dev->st_dev) ++ return 0; + +- d = fdopendir(fd); +- if (!d) { +- safe_close(fd); +- return errno == ENOENT ? 0 : -errno; +- } ++ /* Stop at mount points */ ++ r = fd_is_mount_point(fd, fname, 0); ++ if (r < 0) ++ return r; ++ if (r > 0) ++ return 0; + +- FOREACH_DIRENT_ALL(de, d, return -errno) { +- bool is_dir; +- struct stat st; ++ if ((flags & REMOVE_SUBVOLUME) && btrfs_might_be_subvol(&st)) { + +- if (dot_or_dot_dot(de->d_name)) +- continue; ++ /* This could be a subvolume, try to remove it */ + +- if (de->d_type == DT_UNKNOWN || +- (de->d_type == DT_DIR && (root_dev || (flags & REMOVE_SUBVOLUME)))) { +- r = fstatat_harder(fd, de->d_name, &st, AT_SYMLINK_NOFOLLOW, flags); ++ r = btrfs_subvol_remove_fd(fd, fname, BTRFS_REMOVE_RECURSIVE|BTRFS_REMOVE_QUOTA); + if (r < 0) { +- if (ret == 0 && r != -ENOENT) +- ret = r; +- continue; +- } ++ if (!IN_SET(r, -ENOTTY, -EINVAL)) ++ return r; + +- is_dir = S_ISDIR(st.st_mode); +- } else +- is_dir = de->d_type == DT_DIR; ++ /* ENOTTY, then it wasn't a btrfs subvolume, continue below. */ ++ } else ++ /* It was a subvolume, done. */ ++ return 1; ++ } + +- if (is_dir) { +- _cleanup_close_ int subdir_fd = -1; ++ subdir_fd = openat(fd, fname, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW|O_NOATIME); ++ if (subdir_fd < 0) ++ return -errno; + +- /* if root_dev is set, remove subdirectories only if device is same */ +- if (root_dev && st.st_dev != root_dev->st_dev) +- continue; ++ /* We pass REMOVE_PHYSICAL here, to avoid doing the fstatfs() to check the file system type ++ * again for each directory */ ++ q = rm_rf_children(TAKE_FD(subdir_fd), flags | REMOVE_PHYSICAL, root_dev); + +- subdir_fd = openat(fd, de->d_name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW|O_NOATIME); +- if (subdir_fd < 0) { +- if (ret == 0 && errno != ENOENT) +- ret = -errno; +- continue; +- } ++ r = unlinkat_harder(fd, fname, AT_REMOVEDIR, flags); ++ if (r < 0) ++ return r; ++ if (q < 0) ++ return q; + +- /* Stop at mount points */ +- r = fd_is_mount_point(fd, de->d_name, 0); +- if (r < 0) { +- if (ret == 0 && r != -ENOENT) +- ret = r; ++ return 1; + +- continue; +- } +- if (r > 0) +- continue; ++ } else if (!(flags & REMOVE_ONLY_DIRECTORIES)) { ++ r = unlinkat_harder(fd, fname, 0, flags); ++ if (r < 0) ++ return r; + +- if ((flags & REMOVE_SUBVOLUME) && btrfs_might_be_subvol(&st)) { ++ return 1; ++ } + +- /* This could be a subvolume, try to remove it */ ++ return 0; ++} + +- r = btrfs_subvol_remove_fd(fd, de->d_name, BTRFS_REMOVE_RECURSIVE|BTRFS_REMOVE_QUOTA); +- if (r < 0) { +- if (!IN_SET(r, -ENOTTY, -EINVAL)) { +- if (ret == 0) +- ret = r; ++int rm_rf_children( ++ int fd, ++ RemoveFlags flags, ++ const struct stat *root_dev) { + +- continue; +- } ++ _cleanup_closedir_ DIR *d = NULL; ++ struct dirent *de; ++ int ret = 0, r; + +- /* ENOTTY, then it wasn't a btrfs subvolume, continue below. */ +- } else +- /* It was a subvolume, continue. */ +- continue; +- } ++ assert(fd >= 0); ++ ++ /* This returns the first error we run into, but nevertheless tries to go on. This closes the passed ++ * fd, in all cases, including on failure. */ ++ ++ d = fdopendir(fd); ++ if (!d) { ++ safe_close(fd); ++ return -errno; ++ } + +- /* We pass REMOVE_PHYSICAL here, to avoid doing the fstatfs() to check the file +- * system type again for each directory */ +- r = rm_rf_children(TAKE_FD(subdir_fd), flags | REMOVE_PHYSICAL, root_dev); +- if (r < 0 && ret == 0) +- ret = r; ++ if (!(flags & REMOVE_PHYSICAL)) { ++ struct statfs sfs; + +- r = unlinkat_harder(fd, de->d_name, AT_REMOVEDIR, flags); +- if (r < 0 && r != -ENOENT && ret == 0) +- ret = r; ++ if (fstatfs(dirfd(d), &sfs) < 0) ++ return -errno; ++ ++ if (is_physical_fs(&sfs)) { ++ /* We refuse to clean physical file systems with this call, unless explicitly ++ * requested. This is extra paranoia just to be sure we never ever remove non-state ++ * data. */ + +- } else if (!(flags & REMOVE_ONLY_DIRECTORIES)) { ++ _cleanup_free_ char *path = NULL; + +- r = unlinkat_harder(fd, de->d_name, 0, flags); +- if (r < 0 && r != -ENOENT && ret == 0) +- ret = r; ++ (void) fd_get_path(fd, &path); ++ return log_error_errno(SYNTHETIC_ERRNO(EPERM), ++ "Attempted to remove disk file system under \"%s\", and we can't allow that.", ++ strna(path)); + } + } ++ ++ FOREACH_DIRENT_ALL(de, d, return -errno) { ++ int is_dir; ++ ++ if (dot_or_dot_dot(de->d_name)) ++ continue; ++ ++ is_dir = ++ de->d_type == DT_UNKNOWN ? -1 : ++ de->d_type == DT_DIR; ++ ++ r = rm_rf_children_inner(dirfd(d), de->d_name, is_dir, flags, root_dev); ++ if (r < 0 && r != -ENOENT && ret == 0) ++ ret = r; ++ } ++ + return ret; + } + + int rm_rf(const char *path, RemoveFlags flags) { + int fd, r; +- struct statfs s; + + assert(path); + +@@ -283,9 +298,10 @@ int rm_rf(const char *path, RemoveFlags flags) { + if (FLAGS_SET(flags, REMOVE_ROOT)) { + + if (!FLAGS_SET(flags, REMOVE_PHYSICAL)) { ++ struct statfs s; ++ + if (statfs(path, &s) < 0) + return -errno; +- + if (is_physical_fs(&s)) + return log_error_errno(SYNTHETIC_ERRNO(EPERM), + "Attempted to remove files from a disk file system under \"%s\", refusing.", +@@ -313,3 +329,22 @@ int rm_rf(const char *path, RemoveFlags flags) { + + return r; + } ++ ++int rm_rf_child(int fd, const char *name, RemoveFlags flags) { ++ ++ /* Removes one specific child of the specified directory */ ++ ++ if (fd < 0) ++ return -EBADF; ++ ++ if (!filename_is_valid(name)) ++ return -EINVAL; ++ ++ if ((flags & (REMOVE_ROOT|REMOVE_MISSING_OK)) != 0) /* Doesn't really make sense here, we are not supposed to remove 'fd' anyway */ ++ return -EINVAL; ++ ++ if (FLAGS_SET(flags, REMOVE_ONLY_DIRECTORIES|REMOVE_SUBVOLUME)) ++ return -EINVAL; ++ ++ return rm_rf_children_inner(fd, name, -1, flags, NULL); ++} +diff --git a/src/basic/rm-rf.h b/src/basic/rm-rf.h +index ec56232..b0d5b63 100644 +--- a/src/basic/rm-rf.h ++++ b/src/basic/rm-rf.h +@@ -14,7 +14,8 @@ typedef enum RemoveFlags { + REMOVE_CHMOD = 1 << 5, /* chmod() for write access if we cannot delete something */ + } RemoveFlags; + +-int rm_rf_children(int fd, RemoveFlags flags, struct stat *root_dev); ++int rm_rf_children(int fd, RemoveFlags flags, const struct stat *root_dev); ++int rm_rf_child(int fd, const char *name, RemoveFlags flags); + int rm_rf(const char *path, RemoveFlags flags); + + /* Useful for usage with _cleanup_(), destroys a directory and frees the pointer */ |