From patchwork Mon Oct 24 23:13:29 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sweet Tea Dorminy X-Patchwork-Id: 13018378 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 816DBFA373D for ; Tue, 25 Oct 2022 00:43:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229906AbiJYAnP (ORCPT ); Mon, 24 Oct 2022 20:43:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34160 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231300AbiJYAml (ORCPT ); Mon, 24 Oct 2022 20:42:41 -0400 Received: from box.fidei.email (box.fidei.email [71.19.144.250]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 315184E1A7; Mon, 24 Oct 2022 16:14:45 -0700 (PDT) Received: from authenticated-user (box.fidei.email [71.19.144.250]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (No client certificate requested) by box.fidei.email (Postfix) with ESMTPSA id C0E45812FE; Mon, 24 Oct 2022 19:14:14 -0400 (EDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=dorminy.me; s=mail; t=1666653255; bh=HIZKOYpf8qx91CzZN8tMSorv2ntpGxOAXG9mU6X/su8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=kOXoY98WRI5WOQBs1x58etlDMT3cQVwoOMQ+w3Y8mqdggSNAmmMdGwqWqrDK8ZKNw iWkfh2sHWfV+4h5Diifut/pBzbV/FJcoCSP8yQ8H3Y5CabU4GBiKhG9kbJQ0A+6lCx p0uaBj73STpK6xbGavqKsAbEXgMGiQn4fbnlG1saUSuLoEdQQEYEnBAddf1WZi34G2 Zd+o29pTySlpL5DYkFblrWG1V015zeMqbnNKNREvkHsxYVUbYNkoQOdlDnKo9SAtlM yZPmsl2NNLLXsYDrmc5CWYSgSI4tP00w4qW234EXQu/lgSrfwalgAcYpsh5mzLK5/B I1lqslpljjkRw== From: Sweet Tea Dorminy To: "Theodore Y. Ts'o" , Jaegeuk Kim , Eric Biggers , Chris Mason , Josef Bacik , David Sterba , linux-fscrypt@vger.kernel.org, linux-btrfs@vger.kernel.org, kernel-team@meta.com Cc: Omar Sandoval , Sweet Tea Dorminy Subject: [PATCH v4 19/21] btrfs: permit searching for nokey names for removal Date: Mon, 24 Oct 2022 19:13:29 -0400 Message-Id: In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org From: Omar Sandoval Deleting an encrypted file must always be permitted, even if the user does not have the appropriate key. Therefore, for listing an encrypted directory, so-called 'nokey' names are provided, and these nokey names must be sufficient to look up and delete the appropriate encrypted files. See 'struct fscrypt_nokey_name' for more information on the format of these names. The first part of supporting nokey names is allowing lookups by nokey name. Only a few entry points need to support these: deleting a directory, file, or subvolume -- each of these call fscrypt_setup_filename() with a '1' argument, indicating that the key is not required and therefore a nokey name may be provided. If a nokey name is provided, the fscrypt_name returned by fscrypt_setup_filename() will not have its disk_name field populated, but will have various other fields set. This change alters the relevant codepaths to pass a complete fscrypt_name anywhere that it might contain a nokey name. When it does contain a nokey name, the first time the name is successfully matched to a stored name populates the disk name field of the fscrypt_name, allowing the caller to use the normal disk name codepaths afterward. Otherwise, the matching functionality is in close analogue to the function fscrypt_match_name(). Functions where most callers are providing a fscrypt_str are duplicated and adapted for a fscrypt_name, and functions where most callers are providing a fscrypt_name are changed to so require at all callsites. While it's tempting to try to factor the two callsites of fscrypt_fname_disk_to_usr() together, I can't see a useful way to factor their surrounding logic together. Signed-off-by: Omar Sandoval Signed-off-by: Sweet Tea Dorminy --- fs/btrfs/ctree.h | 19 +++++- fs/btrfs/delayed-inode.c | 30 ++++++++- fs/btrfs/delayed-inode.h | 4 +- fs/btrfs/dir-item.c | 113 ++++++++++++++++++++++++++++--- fs/btrfs/extent_io.c | 38 +++++++++++ fs/btrfs/extent_io.h | 3 + fs/btrfs/fscrypt.c | 45 +++++++++++++ fs/btrfs/fscrypt.h | 18 +++++ fs/btrfs/inode.c | 142 ++++++++++++++++++++++++++------------- fs/btrfs/root-tree.c | 8 ++- fs/btrfs/tree-log.c | 3 +- 11 files changed, 357 insertions(+), 66 deletions(-) diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index 89de35779fd5..adb33e3b5dfb 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -1525,7 +1525,7 @@ int btrfs_add_root_ref(struct btrfs_trans_handle *trans, u64 root_id, const struct fscrypt_str *name); int btrfs_del_root_ref(struct btrfs_trans_handle *trans, u64 root_id, u64 ref_id, u64 dirid, u64 *sequence, - const struct fscrypt_str *name); + struct fscrypt_name *name); int btrfs_del_root(struct btrfs_trans_handle *trans, const struct btrfs_key *key); int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root *root, @@ -1563,14 +1563,24 @@ struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, struct btrfs_path *path, u64 dir, const struct fscrypt_str *name, int mod); struct btrfs_dir_item * +btrfs_lookup_dir_item_fname(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + struct btrfs_path *path, u64 dir, + struct fscrypt_name *name, int mod); +struct btrfs_dir_item * btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans, struct btrfs_root *root, struct btrfs_path *path, u64 dir, u64 index, const struct fscrypt_str *name, int mod); struct btrfs_dir_item * +btrfs_lookup_dir_index_item_fname(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + struct btrfs_path *path, u64 dir, + u64 index, struct fscrypt_name *name); +struct btrfs_dir_item * btrfs_search_dir_index_item(struct btrfs_root *root, struct btrfs_path *path, u64 dirid, - const struct fscrypt_str *name); + struct fscrypt_name *name); int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans, struct btrfs_root *root, struct btrfs_path *path, @@ -1585,6 +1595,9 @@ struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans, struct btrfs_path *path, u64 dir, const char *name, u16 name_len, int mod); +struct btrfs_dir_item *btrfs_match_dir_item_fname(struct btrfs_fs_info *fs_info, + struct btrfs_path *path, + struct fscrypt_name *name); struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_fs_info *fs_info, struct btrfs_path *path, const char *name, @@ -1651,7 +1664,7 @@ struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry); int btrfs_set_inode_index(struct btrfs_inode *dir, u64 *index); int btrfs_unlink_inode(struct btrfs_trans_handle *trans, struct btrfs_inode *dir, struct btrfs_inode *inode, - const struct fscrypt_str *name); + struct fscrypt_name *name); int btrfs_add_link(struct btrfs_trans_handle *trans, struct btrfs_inode *parent_inode, struct btrfs_inode *inode, const struct fscrypt_str *name, int add_backref, u64 index); diff --git a/fs/btrfs/delayed-inode.c b/fs/btrfs/delayed-inode.c index a935709f2a29..490d20a50378 100644 --- a/fs/btrfs/delayed-inode.c +++ b/fs/btrfs/delayed-inode.c @@ -1497,6 +1497,7 @@ int btrfs_insert_delayed_dir_index(struct btrfs_trans_handle *trans, ret = __btrfs_add_delayed_item(delayed_node, delayed_item); if (unlikely(ret)) { + // TODO: It would be nice to print the base64encoded name here maybe? btrfs_err(trans->fs_info, "err add delayed dir index item(name: %.*s) into the insertion tree of the delayed node(root id: %llu, inode id: %llu, errno: %d)", name_len, name, delayed_node->root->root_key.objectid, @@ -1724,7 +1725,9 @@ int btrfs_should_delete_dir_index(struct list_head *del_list, * btrfs_readdir_delayed_dir_index - read dir info stored in the delayed tree * */ -int btrfs_readdir_delayed_dir_index(struct dir_context *ctx, +int btrfs_readdir_delayed_dir_index(struct inode *inode, + struct fscrypt_str *fstr, + struct dir_context *ctx, struct list_head *ins_list) { struct btrfs_dir_item *di; @@ -1734,6 +1737,7 @@ int btrfs_readdir_delayed_dir_index(struct dir_context *ctx, int name_len; int over = 0; unsigned char d_type; + size_t fstr_len = fstr->len; if (list_empty(ins_list)) return 0; @@ -1761,8 +1765,28 @@ int btrfs_readdir_delayed_dir_index(struct dir_context *ctx, d_type = fs_ftype_to_dtype(btrfs_dir_flags_to_ftype(di->type)); btrfs_disk_key_to_cpu(&location, &di->location); - over = !dir_emit(ctx, name, name_len, - location.objectid, d_type); + if (di->type & BTRFS_FT_ENCRYPTED) { + int ret; + struct fscrypt_str iname = FSTR_INIT(name, name_len); + + fstr->len = fstr_len; + /* + * The hash is only used when the encryption key is not + * available. But if we have delayed insertions, then we + * must have the encryption key available or we wouldn't + * have been able to create entries in the directory. + * So, we don't calculate the hash. + */ + ret = fscrypt_fname_disk_to_usr(inode, 0, 0, &iname, + fstr); + if (ret) + return ret; + over = !dir_emit(ctx, fstr->name, fstr->len, + location.objectid, d_type); + } else { + over = !dir_emit(ctx, name, name_len, location.objectid, + d_type); + } if (refcount_dec_and_test(&curr->refs)) kfree(curr); diff --git a/fs/btrfs/delayed-inode.h b/fs/btrfs/delayed-inode.h index 4f21daa3dbc7..a4f9fa27b126 100644 --- a/fs/btrfs/delayed-inode.h +++ b/fs/btrfs/delayed-inode.h @@ -155,7 +155,9 @@ void btrfs_readdir_put_delayed_items(struct inode *inode, struct list_head *del_list); int btrfs_should_delete_dir_index(struct list_head *del_list, u64 index); -int btrfs_readdir_delayed_dir_index(struct dir_context *ctx, +int btrfs_readdir_delayed_dir_index(struct inode *inode, + struct fscrypt_str *fstr, + struct dir_context *ctx, struct list_head *ins_list); /* Used during directory logging. */ diff --git a/fs/btrfs/dir-item.c b/fs/btrfs/dir-item.c index ca69fb35a2cc..d5275475e69e 100644 --- a/fs/btrfs/dir-item.c +++ b/fs/btrfs/dir-item.c @@ -6,6 +6,7 @@ #include "messages.h" #include "ctree.h" #include "disk-io.h" +#include "fscrypt.h" #include "transaction.h" #include "accessors.h" @@ -229,6 +230,47 @@ struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, return di; } +/* + * Lookup for a directory item by fscrypt_name. + * + * @trans: The transaction handle to use. + * @root: The root of the target tree. + * @path: Path to use for the search. + * @dir: The inode number (objectid) of the directory. + * @name: The fscrypt_name associated to the directory entry + * @mod: Used to indicate if the tree search is meant for a read only + * lookup or for a deletion lookup, so its value should be 0 or + * -1, respectively. + * + * Returns: NULL if the dir item does not exists, an error pointer if an error + * happened, or a pointer to a dir item if a dir item exists for the given name. + */ +struct btrfs_dir_item *btrfs_lookup_dir_item_fname(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + struct btrfs_path *path, u64 dir, + struct fscrypt_name *name, int mod) +{ + struct btrfs_key key; + struct btrfs_dir_item *di; + int ret = 0; + + key.objectid = dir; + key.type = BTRFS_DIR_ITEM_KEY; + key.offset = btrfs_name_hash(name->disk_name.name, name->disk_name.len); + /* XXX get the right hash for no-key names */ + + ret = btrfs_search_slot(trans, root, &key, path, mod, -mod); + if (ret == 0) + di = btrfs_match_dir_item_fname(root->fs_info, path, name); + + if (ret == -ENOENT || (IS_ERR(di) && PTR_ERR(di) == -ENOENT)) + return NULL; + if (ret < 0) + di = ERR_PTR(ret); + + return di; +} + int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir, const struct fscrypt_str *name) { @@ -295,6 +337,46 @@ int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir, * @index: The index number. * @name: The name associated to the directory entry we are looking for. * @name_len: The length of the name. + * + * Returns: NULL if the dir index item does not exists, an error pointer if an + * error happened, or a pointer to a dir item if the dir index item exists and + * matches the criteria (name and index number). + */ +struct btrfs_dir_item * +btrfs_lookup_dir_index_item_fname(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + struct btrfs_path *path, u64 dir, + u64 index, struct fscrypt_name *name) +{ + struct btrfs_dir_item *di; + struct btrfs_key key; + int ret; + + key.objectid = dir; + key.type = BTRFS_DIR_INDEX_KEY; + key.offset = index; + + ret = btrfs_search_slot(trans, root, &key, path, -1, 1); + di = btrfs_match_dir_item_fname(root->fs_info, path, name); + + if (ret < 0) + return ERR_PTR(ret); + if (ret == -ENOENT || ret > 0 || (IS_ERR(di) && PTR_ERR(di) == -ENOENT)) + return NULL; + + return di; +} + +/* + * Lookup for a directory index item by fscrypt_name and index number. + * + * @trans: The transaction handle to use. + * @root: The root of the target tree. + * @path: Path to use for the search. + * @dir: The inode number (objectid) of the directory. + * @index: The index number. + * @name: The name associated to the directory entry we are looking for. + * @name_len: The length of the name. * @mod: Used to indicate if the tree search is meant for a read only * lookup, for a modification lookup or for a deletion lookup, so * its value should be 0, 1 or -1, respectively. @@ -326,7 +408,7 @@ btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans, struct btrfs_dir_item * btrfs_search_dir_index_item(struct btrfs_root *root, struct btrfs_path *path, - u64 dirid, const struct fscrypt_str *name) + u64 dirid, struct fscrypt_name *name) { struct btrfs_dir_item *di; struct btrfs_key key; @@ -339,9 +421,7 @@ btrfs_search_dir_index_item(struct btrfs_root *root, struct btrfs_path *path, btrfs_for_each_slot(root, &key, &key, path, ret) { if (key.objectid != dirid || key.type != BTRFS_DIR_INDEX_KEY) break; - - di = btrfs_match_dir_item_name(root->fs_info, path, - name->name, name->len); + di = btrfs_match_dir_item_fname(root->fs_info, path, name); if (di) return di; } @@ -377,9 +457,9 @@ struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans, * this walks through all the entries in a dir item and finds one * for a specific name. */ -struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_fs_info *fs_info, - struct btrfs_path *path, - const char *name, int name_len) +struct btrfs_dir_item *btrfs_match_dir_item_fname(struct btrfs_fs_info *fs_info, + struct btrfs_path *path, + struct fscrypt_name *name) { struct btrfs_dir_item *dir_item; unsigned long name_ptr; @@ -398,8 +478,8 @@ struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_fs_info *fs_info, btrfs_dir_data_len(leaf, dir_item); name_ptr = (unsigned long)(dir_item + 1); - if (btrfs_dir_name_len(leaf, dir_item) == name_len && - memcmp_extent_buffer(leaf, name, name_ptr, name_len) == 0) + if (btrfs_fscrypt_match_name(name, leaf, name_ptr, + btrfs_dir_name_len(leaf, dir_item))) return dir_item; cur += this_len; @@ -409,6 +489,21 @@ struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_fs_info *fs_info, return NULL; } +/* + * helper function to look at the directory item pointed to by 'path' + * this walks through all the entries in a dir item and finds one + * for a specific name. + */ +struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_fs_info *fs_info, + struct btrfs_path *path, + const char *name, int name_len) +{ + struct fscrypt_name fname = { + .disk_name = FSTR_INIT((char *) name, name_len) + }; + return btrfs_match_dir_item_fname(fs_info, path, &fname); +} + /* * given a pointer into a directory item, delete it. This * handles items that have more than one entry in them. diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 329936df0cb0..2c1dd67b9489 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -5330,6 +5330,44 @@ static void assert_eb_page_uptodate(const struct extent_buffer *eb, } } +/* Take a sha256 of a portion of an extent buffer. */ +void extent_buffer_sha256(const struct extent_buffer *eb, + unsigned long start, + unsigned long len, u8 *out) +{ + size_t cur; + size_t offset; + struct page *page; + char *kaddr; + unsigned long i = get_eb_page_index(start); + struct sha256_state sctx; + + if (check_eb_range(eb, start, len)) + return; + + offset = get_eb_offset_in_page(eb, start); + + /* + * TODO: This should maybe be using the crypto API, not the fallback, + * but fscrypt uses the fallback and this is only used in emulation of + * fscrypt's buffer sha256 method. + */ + sha256_init(&sctx); + while (len > 0) { + page = eb->pages[i]; + assert_eb_page_uptodate(eb, page); + + cur = min(len, PAGE_SIZE - offset); + kaddr = page_address(page); + sha256_update(&sctx, (u8 *)(kaddr + offset), cur); + + len -= cur; + offset = 0; + i++; + } + sha256_final(&sctx, out); +} + void write_extent_buffer_chunk_tree_uuid(const struct extent_buffer *eb, const void *srcv) { diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h index a5ec1475988f..0a82604b0feb 100644 --- a/fs/btrfs/extent_io.h +++ b/fs/btrfs/extent_io.h @@ -203,6 +203,9 @@ static inline int extent_buffer_uptodate(const struct extent_buffer *eb) int memcmp_extent_buffer(const struct extent_buffer *eb, const void *ptrv, unsigned long start, unsigned long len); +void extent_buffer_sha256(const struct extent_buffer *eb, + unsigned long start, + unsigned long len, u8 *out); void read_extent_buffer(const struct extent_buffer *eb, void *dst, unsigned long start, unsigned long len); diff --git a/fs/btrfs/fscrypt.c b/fs/btrfs/fscrypt.c index 68c250eb4338..c7c6e331bc17 100644 --- a/fs/btrfs/fscrypt.c +++ b/fs/btrfs/fscrypt.c @@ -12,6 +12,51 @@ #include "xattr.h" #include "fscrypt.h" + +/* + * This function is extremely similar to fscrypt_match_name() but uses an + * extent_buffer. Also, it edits the provided argument to populate the disk_name + * if we successfully match and previously were using a nokey name. + */ +bool btrfs_fscrypt_match_name(struct fscrypt_name *fname, + struct extent_buffer *leaf, unsigned long de_name, + u32 de_name_len) +{ + const struct fscrypt_nokey_name *nokey_name = + (const void *)fname->crypto_buf.name; + u8 digest[SHA256_DIGEST_SIZE]; + + if (likely(fname->disk_name.name)) { + if (de_name_len != fname->disk_name.len) + return false; + return !memcmp_extent_buffer(leaf, fname->disk_name.name, + de_name, de_name_len); + } + if (de_name_len <= sizeof(nokey_name->bytes)) + return false; + if (memcmp_extent_buffer(leaf, nokey_name->bytes, de_name, + sizeof(nokey_name->bytes))) + return false; + extent_buffer_sha256(leaf, de_name + sizeof(nokey_name->bytes), + de_name_len - sizeof(nokey_name->bytes), digest); + if (!memcmp(digest, nokey_name->sha256, sizeof(digest))) { + /* + * For no-key names, we use this opportunity to find the disk + * name, so future searches don't need to deal with nokey names + * and we know what the encrypted size is. + */ + fname->disk_name.name = kmalloc(de_name_len, GFP_KERNEL | GFP_NOFS); + if (!fname->disk_name.name) + fname->disk_name.name = ERR_PTR(-ENOMEM); + else + read_extent_buffer(leaf, fname->disk_name.name, + de_name, de_name_len); + fname->disk_name.len = de_name_len; + return true; + } + return false; +} + static int btrfs_fscrypt_get_context(struct inode *inode, void *ctx, size_t len) { struct btrfs_root *root = BTRFS_I(inode)->root; diff --git a/fs/btrfs/fscrypt.h b/fs/btrfs/fscrypt.h index 86dc0e0b91b9..4dd536611cd5 100644 --- a/fs/btrfs/fscrypt.h +++ b/fs/btrfs/fscrypt.h @@ -24,6 +24,24 @@ struct btrfs_fscrypt_extent_context { }; #endif +#ifdef CONFIG_FS_ENCRYPTION +bool btrfs_fscrypt_match_name(struct fscrypt_name *fname, + struct extent_buffer *leaf, + unsigned long de_name, u32 de_name_len); + +#else +static inline bool btrfs_fscrypt_match_name(struct fscrypt_name *fname, + struct extent_buffer *leaf, + unsigned long de_name, + u32 de_name_len) +{ + if (de_name_len != fname_len(fname)) + return false; + return !memcmp_extent_buffer(leaf, fname->disk_name.name, de_name, + de_name_len); +} +#endif /* CONFIG_FS_ENCRYPTION */ + static inline void btrfs_unpack_encryption(u8 encryption, u8 *policy, u8 *ctxsize) diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 2976f0c078cb..2142d719e1b6 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -4306,7 +4306,7 @@ int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans, static int __btrfs_unlink_inode(struct btrfs_trans_handle *trans, struct btrfs_inode *dir, struct btrfs_inode *inode, - const struct fscrypt_str *name, + struct fscrypt_name *name, struct btrfs_rename_ctx *rename_ctx) { struct btrfs_root *root = dir->root; @@ -4324,7 +4324,7 @@ static int __btrfs_unlink_inode(struct btrfs_trans_handle *trans, goto out; } - di = btrfs_lookup_dir_item(trans, root, path, dir_ino, name, -1); + di = btrfs_lookup_dir_item_fname(trans, root, path, dir_ino, name, -1); if (IS_ERR_OR_NULL(di)) { ret = di ? PTR_ERR(di) : -ENOENT; goto err; @@ -4352,11 +4352,14 @@ static int __btrfs_unlink_inode(struct btrfs_trans_handle *trans, } } - ret = btrfs_del_inode_ref(trans, root, name, ino, dir_ino, &index); + ret = btrfs_del_inode_ref(trans, root, &name->disk_name, ino, dir_ino, + &index); if (ret) { + /* This should print a base-64 encoded name if relevant? */ btrfs_info(fs_info, "failed to delete reference to %.*s, inode %llu parent %llu", - name->len, name->name, ino, dir_ino); + name->disk_name.len, name->disk_name.name, ino, + dir_ino); btrfs_abort_transaction(trans, ret); goto err; } @@ -4377,8 +4380,10 @@ static int __btrfs_unlink_inode(struct btrfs_trans_handle *trans, * operations on the log tree, increasing latency for applications. */ if (!rename_ctx) { - btrfs_del_inode_ref_in_log(trans, root, name, inode, dir_ino); - btrfs_del_dir_entries_in_log(trans, root, name, dir, index); + btrfs_del_inode_ref_in_log(trans, root, &name->disk_name, + inode, dir_ino); + btrfs_del_dir_entries_in_log(trans, root, &name->disk_name, + dir, index); } /* @@ -4396,7 +4401,7 @@ static int __btrfs_unlink_inode(struct btrfs_trans_handle *trans, if (ret) goto out; - btrfs_i_size_write(dir, dir->vfs_inode.i_size - name->len * 2); + btrfs_i_size_write(dir, dir->vfs_inode.i_size - name->disk_name.len * 2); inode_inc_iversion(&inode->vfs_inode); inode_inc_iversion(&dir->vfs_inode); inode->vfs_inode.i_ctime = current_time(&inode->vfs_inode); @@ -4409,7 +4414,7 @@ static int __btrfs_unlink_inode(struct btrfs_trans_handle *trans, int btrfs_unlink_inode(struct btrfs_trans_handle *trans, struct btrfs_inode *dir, struct btrfs_inode *inode, - const struct fscrypt_str *name) + struct fscrypt_name *name) { int ret; ret = __btrfs_unlink_inode(trans, dir, inode, name, NULL); @@ -4465,7 +4470,7 @@ static int btrfs_unlink(struct inode *dir, struct dentry *dentry) 0); ret = btrfs_unlink_inode(trans, BTRFS_I(dir), BTRFS_I(d_inode(dentry)), - &fname.disk_name); + &fname); if (ret) goto out; @@ -4501,8 +4506,6 @@ static int btrfs_unlink_subvol(struct btrfs_trans_handle *trans, if (ret) return ret; - /* This needs to handle no-key deletions later on */ - if (btrfs_ino(inode) == BTRFS_FIRST_FREE_OBJECTID) { objectid = inode->root->root_key.objectid; } else if (btrfs_ino(inode) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID) { @@ -4519,8 +4522,8 @@ static int btrfs_unlink_subvol(struct btrfs_trans_handle *trans, goto out; } - di = btrfs_lookup_dir_item(trans, root, path, dir_ino, - &fname.disk_name, -1); + di = btrfs_lookup_dir_item_fname(trans, root, path, dir_ino, + &fname, -1); if (IS_ERR_OR_NULL(di)) { ret = di ? PTR_ERR(di) : -ENOENT; goto out; @@ -4546,8 +4549,7 @@ static int btrfs_unlink_subvol(struct btrfs_trans_handle *trans, * call btrfs_del_root_ref, and it _shouldn't_ fail. */ if (btrfs_ino(inode) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID) { - di = btrfs_search_dir_index_item(root, path, dir_ino, - &fname.disk_name); + di = btrfs_search_dir_index_item(root, path, dir_ino, &fname); if (IS_ERR_OR_NULL(di)) { if (!di) ret = -ENOENT; @@ -4564,7 +4566,7 @@ static int btrfs_unlink_subvol(struct btrfs_trans_handle *trans, } else { ret = btrfs_del_root_ref(trans, objectid, root->root_key.objectid, dir_ino, - &index, &fname.disk_name); + &index, &fname); if (ret) { btrfs_abort_transaction(trans, ret); goto out; @@ -4867,8 +4869,6 @@ static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) if (err) return err; - /* This needs to handle no-key deletions later on */ - trans = __unlink_start_trans(dir); if (IS_ERR(trans)) { err = PTR_ERR(trans); @@ -4888,7 +4888,7 @@ static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) /* now the directory is empty */ err = btrfs_unlink_inode(trans, BTRFS_I(dir), BTRFS_I(d_inode(dentry)), - &fname.disk_name); + &fname); if (!err) { btrfs_i_size_write(BTRFS_I(inode), 0); /* @@ -5581,27 +5581,20 @@ void btrfs_evict_inode(struct inode *inode) * If no dir entries were found, returns -ENOENT. * If found a corrupted location in dir entry, returns -EUCLEAN. */ -static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, +static int btrfs_inode_by_name(struct inode *dir, struct fscrypt_name *fname, struct btrfs_key *location, u8 *type) { struct btrfs_dir_item *di; struct btrfs_path *path; struct btrfs_root *root = BTRFS_I(dir)->root; int ret = 0; - struct fscrypt_name fname; path = btrfs_alloc_path(); if (!path) return -ENOMEM; - ret = fscrypt_setup_filename(dir, &dentry->d_name, 1, &fname); - if (ret) - goto out; - - /* This needs to handle no-key deletions later on */ - - di = btrfs_lookup_dir_item(NULL, root, path, btrfs_ino(BTRFS_I(dir)), - &fname.disk_name, 0); + di = btrfs_lookup_dir_item_fname(NULL, root, path, + btrfs_ino(BTRFS_I(dir)), fname, 0); if (IS_ERR_OR_NULL(di)) { ret = di ? PTR_ERR(di) : -ENOENT; goto out; @@ -5613,13 +5606,13 @@ static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, ret = -EUCLEAN; btrfs_warn(root->fs_info, "%s gets something invalid in DIR_ITEM (name %s, directory ino %llu, location(%llu %u %llu))", - __func__, fname.disk_name.name, btrfs_ino(BTRFS_I(dir)), - location->objectid, location->type, location->offset); + __func__, fname->usr_fname->name, + btrfs_ino(BTRFS_I(dir)), location->objectid, + location->type, location->offset); } if (!ret) *type = btrfs_dir_ftype(path->nodes[0], di); out: - fscrypt_free_filename(&fname); btrfs_free_path(path); return ret; } @@ -5892,13 +5885,18 @@ struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry) struct btrfs_root *root = BTRFS_I(dir)->root; struct btrfs_root *sub_root = root; struct btrfs_key location; + struct fscrypt_name fname; u8 di_type = 0; int ret = 0; if (dentry->d_name.len > BTRFS_NAME_LEN) return ERR_PTR(-ENAMETOOLONG); - ret = btrfs_inode_by_name(dir, dentry, &location, &di_type); + ret = fscrypt_prepare_lookup(dir, dentry, &fname); + if (ret) + return ERR_PTR(ret); + + ret = btrfs_inode_by_name(dir, &fname, &location, &di_type); if (ret < 0) return ERR_PTR(ret); @@ -6039,18 +6037,32 @@ static int btrfs_real_readdir(struct file *file, struct dir_context *ctx) struct list_head del_list; int ret; char *name_ptr; - int name_len; + u32 name_len; int entries = 0; int total_len = 0; bool put = false; struct btrfs_key location; + struct fscrypt_str fstr = FSTR_INIT(NULL, 0); + u32 fstr_len = 0; if (!dir_emit_dots(file, ctx)) return 0; + if (BTRFS_I(inode)->flags & BTRFS_INODE_FSCRYPT_CONTEXT) { + ret = fscrypt_prepare_readdir(inode); + if (ret) + return ret; + ret = fscrypt_fname_alloc_buffer(BTRFS_NAME_LEN, &fstr); + if (ret) + return ret; + fstr_len = fstr.len; + } + path = btrfs_alloc_path(); - if (!path) - return -ENOMEM; + if (!path) { + ret = -ENOMEM; + goto err_fstr; + } addr = private->filldir_buf; path->reada = READA_FORWARD; @@ -6068,6 +6080,7 @@ static int btrfs_real_readdir(struct file *file, struct dir_context *ctx) struct dir_entry *entry; struct extent_buffer *leaf = path->nodes[0]; u8 ftype; + u32 nokey_len; if (found_key.objectid != key.objectid) break; @@ -6079,8 +6092,13 @@ static int btrfs_real_readdir(struct file *file, struct dir_context *ctx) continue; di = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dir_item); name_len = btrfs_dir_name_len(leaf, di); - if ((total_len + sizeof(struct dir_entry) + name_len) >= - PAGE_SIZE) { + nokey_len = DIV_ROUND_UP(name_len * 4, 3); + /* + * If name is encrypted, and we don't have the key, we could + * need up to 4/3rds the bytes to print it. + */ + if ((total_len + sizeof(struct dir_entry) + nokey_len) + >= PAGE_SIZE) { btrfs_release_path(path); ret = btrfs_filldir(private->filldir_buf, entries, ctx); if (ret) @@ -6094,8 +6112,36 @@ static int btrfs_real_readdir(struct file *file, struct dir_context *ctx) ftype = btrfs_dir_flags_to_ftype(btrfs_dir_flags(leaf, di)); entry = addr; name_ptr = (char *)(entry + 1); - read_extent_buffer(leaf, name_ptr, - (unsigned long)(di + 1), name_len); + if (btrfs_dir_flags(leaf, di) & BTRFS_FT_ENCRYPTED) { + struct fscrypt_str oname = FSTR_INIT(name_ptr, + nokey_len); + u32 hash = 0, minor_hash = 0; + + read_extent_buffer(leaf, fstr.name, + (unsigned long)(di + 1), name_len); + fstr.len = name_len; + /* + * We're iterating through DIR_INDEX items, so we don't + * have the DIR_ITEM hash handy. Only compute it if + * we'll need it -- the nokey name stores it, so that + * we can look up the appropriate item by nokey name + * later on. + */ + if (!fscrypt_has_encryption_key(inode)) { + u64 name_hash = btrfs_name_hash(fstr.name, + fstr.len); + hash = name_hash; + minor_hash = name_hash >> 32; + } + ret = fscrypt_fname_disk_to_usr(inode, hash, minor_hash, + &fstr, &oname); + if (ret) + goto err; + name_len = oname.len; + } else { + read_extent_buffer(leaf, name_ptr, + (unsigned long)(di + 1), name_len); + } put_unaligned(name_len, &entry->name_len); put_unaligned(fs_ftype_to_dtype(ftype), &entry->type); btrfs_dir_item_key_to_cpu(leaf, di, &location); @@ -6115,7 +6161,8 @@ static int btrfs_real_readdir(struct file *file, struct dir_context *ctx) if (ret) goto nopos; - ret = btrfs_readdir_delayed_dir_index(ctx, &ins_list); + fstr.len = fstr_len; + ret = btrfs_readdir_delayed_dir_index(inode, &fstr, ctx, &ins_list); if (ret) goto nopos; @@ -6146,6 +6193,8 @@ static int btrfs_real_readdir(struct file *file, struct dir_context *ctx) if (put) btrfs_readdir_put_delayed_items(inode, &ins_list, &del_list); btrfs_free_path(path); +err_fstr: + fscrypt_fname_free_buffer(&fstr); return ret; } @@ -6675,6 +6724,7 @@ int btrfs_add_link(struct btrfs_trans_handle *trans, struct btrfs_root *root = parent_inode->root; u64 ino = btrfs_ino(inode); u64 parent_ino = btrfs_ino(parent_inode); + struct fscrypt_name fname = { .disk_name = *name }; if (unlikely(ino == BTRFS_FIRST_FREE_OBJECTID)) { memcpy(&key, &inode->root->root_key, sizeof(key)); @@ -6732,7 +6782,7 @@ int btrfs_add_link(struct btrfs_trans_handle *trans, int err; err = btrfs_del_root_ref(trans, key.objectid, root->root_key.objectid, parent_ino, - &local_index, name); + &local_index, &fname); if (err) btrfs_abort_transaction(trans, err); } else if (add_backref) { @@ -9299,7 +9349,7 @@ static int btrfs_rename_exchange(struct inode *old_dir, } else { /* src is an inode */ ret = __btrfs_unlink_inode(trans, BTRFS_I(old_dir), BTRFS_I(old_dentry->d_inode), - old_name, &old_rename_ctx); + &old_fname, &old_rename_ctx); if (!ret) ret = btrfs_update_inode(trans, root, BTRFS_I(old_inode)); } @@ -9314,7 +9364,7 @@ static int btrfs_rename_exchange(struct inode *old_dir, } else { /* dest is an inode */ ret = __btrfs_unlink_inode(trans, BTRFS_I(new_dir), BTRFS_I(new_dentry->d_inode), - new_name, &new_rename_ctx); + &new_fname, &new_rename_ctx); if (!ret) ret = btrfs_update_inode(trans, dest, BTRFS_I(new_inode)); } @@ -9563,7 +9613,7 @@ static int btrfs_rename(struct user_namespace *mnt_userns, } else { ret = __btrfs_unlink_inode(trans, BTRFS_I(old_dir), BTRFS_I(d_inode(old_dentry)), - &old_fname.disk_name, &rename_ctx); + &old_fname, &rename_ctx); if (!ret) ret = btrfs_update_inode(trans, root, BTRFS_I(old_inode)); } @@ -9582,7 +9632,7 @@ static int btrfs_rename(struct user_namespace *mnt_userns, } else { ret = btrfs_unlink_inode(trans, BTRFS_I(new_dir), BTRFS_I(d_inode(new_dentry)), - &new_fname.disk_name); + &new_fname); } if (!ret && new_inode->i_nlink == 0) ret = btrfs_orphan_add(trans, diff --git a/fs/btrfs/root-tree.c b/fs/btrfs/root-tree.c index 8009724b8b2b..3f1c199a6140 100644 --- a/fs/btrfs/root-tree.c +++ b/fs/btrfs/root-tree.c @@ -10,6 +10,7 @@ #include "messages.h" #include "transaction.h" #include "disk-io.h" +#include "fscrypt.h" #include "print-tree.h" #include "qgroup.h" #include "space-info.h" @@ -332,7 +333,7 @@ int btrfs_del_root(struct btrfs_trans_handle *trans, int btrfs_del_root_ref(struct btrfs_trans_handle *trans, u64 root_id, u64 ref_id, u64 dirid, u64 *sequence, - const struct fscrypt_str *name) + struct fscrypt_name *name) { struct btrfs_root *tree_root = trans->fs_info->tree_root; struct btrfs_path *path; @@ -354,13 +355,14 @@ int btrfs_del_root_ref(struct btrfs_trans_handle *trans, u64 root_id, if (ret < 0) { goto out; } else if (ret == 0) { + u32 name_len; leaf = path->nodes[0]; ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_root_ref); ptr = (unsigned long)(ref + 1); + name_len = btrfs_root_ref_name_len(leaf, ref); if ((btrfs_root_ref_dirid(leaf, ref) != dirid) || - (btrfs_root_ref_name_len(leaf, ref) != name->len) || - memcmp_extent_buffer(leaf, name->name, ptr, name->len)) { + !btrfs_fscrypt_match_name(name, leaf, ptr, name_len)) { ret = -ENOENT; goto out; } diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c index 02f9966a66e7..1a5e8196e2b0 100644 --- a/fs/btrfs/tree-log.c +++ b/fs/btrfs/tree-log.c @@ -918,9 +918,10 @@ static int unlink_inode_for_log_replay(struct btrfs_trans_handle *trans, struct btrfs_inode *inode, const struct fscrypt_str *name) { + struct fscrypt_name fname = { .disk_name = *name, }; int ret; - ret = btrfs_unlink_inode(trans, dir, inode, name); + ret = btrfs_unlink_inode(trans, dir, inode, &fname); if (ret) return ret; /*