diff options
| -rw-r--r-- | ubifs-utils/libubifs/sb.c | 482 |
1 files changed, 18 insertions, 464 deletions
diff --git a/ubifs-utils/libubifs/sb.c b/ubifs-utils/libubifs/sb.c index e7693b9..312661d 100644 --- a/ubifs-utils/libubifs/sb.c +++ b/ubifs-utils/libubifs/sb.c @@ -14,358 +14,18 @@ * change it. The superblock node mostly contains geometry information. */ +#include "linux_err.h" +#include "bitops.h" +#include "kmem.h" #include "ubifs.h" -#include <linux/slab.h> -#include <linux/math64.h> -#include <linux/uuid.h> - -/* - * Default journal size in logical eraseblocks as a percent of total - * flash size. - */ -#define DEFAULT_JNL_PERCENT 5 - -/* Default maximum journal size in bytes */ -#define DEFAULT_MAX_JNL (32*1024*1024) - -/* Default indexing tree fanout */ -#define DEFAULT_FANOUT 8 - -/* Default number of data journal heads */ -#define DEFAULT_JHEADS_CNT 1 - -/* Default positions of different LEBs in the main area */ -#define DEFAULT_IDX_LEB 0 -#define DEFAULT_DATA_LEB 1 -#define DEFAULT_GC_LEB 2 +#include "defs.h" +#include "debug.h" +#include "key.h" +#include "misc.h" /* Default number of LEB numbers in LPT's save table */ #define DEFAULT_LSAVE_CNT 256 -/* Default reserved pool size as a percent of maximum free space */ -#define DEFAULT_RP_PERCENT 5 - -/* The default maximum size of reserved pool in bytes */ -#define DEFAULT_MAX_RP_SIZE (5*1024*1024) - -/* Default time granularity in nanoseconds */ -#define DEFAULT_TIME_GRAN 1000000000 - -static int get_default_compressor(struct ubifs_info *c) -{ - if (ubifs_compr_present(c, UBIFS_COMPR_ZSTD)) - return UBIFS_COMPR_ZSTD; - - if (ubifs_compr_present(c, UBIFS_COMPR_LZO)) - return UBIFS_COMPR_LZO; - - if (ubifs_compr_present(c, UBIFS_COMPR_ZLIB)) - return UBIFS_COMPR_ZLIB; - - return UBIFS_COMPR_NONE; -} - -/** - * create_default_filesystem - format empty UBI volume. - * @c: UBIFS file-system description object - * - * This function creates default empty file-system. Returns zero in case of - * success and a negative error code in case of failure. - */ -static int create_default_filesystem(struct ubifs_info *c) -{ - struct ubifs_sb_node *sup; - struct ubifs_mst_node *mst; - struct ubifs_idx_node *idx; - struct ubifs_branch *br; - struct ubifs_ino_node *ino; - struct ubifs_cs_node *cs; - union ubifs_key key; - int err, tmp, jnl_lebs, log_lebs, max_buds, main_lebs, main_first; - int lpt_lebs, lpt_first, orph_lebs, big_lpt, ino_waste, sup_flags = 0; - int min_leb_cnt = UBIFS_MIN_LEB_CNT; - int idx_node_size; - long long tmp64, main_bytes; - __le64 tmp_le64; - struct timespec64 ts; - u8 hash[UBIFS_HASH_ARR_SZ]; - u8 hash_lpt[UBIFS_HASH_ARR_SZ]; - - /* Some functions called from here depend on the @c->key_len filed */ - c->key_len = UBIFS_SK_LEN; - - /* - * First of all, we have to calculate default file-system geometry - - * log size, journal size, etc. - */ - if (c->leb_cnt < 0x7FFFFFFF / DEFAULT_JNL_PERCENT) - /* We can first multiply then divide and have no overflow */ - jnl_lebs = c->leb_cnt * DEFAULT_JNL_PERCENT / 100; - else - jnl_lebs = (c->leb_cnt / 100) * DEFAULT_JNL_PERCENT; - - if (jnl_lebs < UBIFS_MIN_JNL_LEBS) - jnl_lebs = UBIFS_MIN_JNL_LEBS; - if (jnl_lebs * c->leb_size > DEFAULT_MAX_JNL) - jnl_lebs = DEFAULT_MAX_JNL / c->leb_size; - - /* - * The log should be large enough to fit reference nodes for all bud - * LEBs. Because buds do not have to start from the beginning of LEBs - * (half of the LEB may contain committed data), the log should - * generally be larger, make it twice as large. - */ - tmp = 2 * (c->ref_node_alsz * jnl_lebs) + c->leb_size - 1; - log_lebs = tmp / c->leb_size; - /* Plus one LEB reserved for commit */ - log_lebs += 1; - if (c->leb_cnt - min_leb_cnt > 8) { - /* And some extra space to allow writes while committing */ - log_lebs += 1; - min_leb_cnt += 1; - } - - max_buds = jnl_lebs - log_lebs; - if (max_buds < UBIFS_MIN_BUD_LEBS) - max_buds = UBIFS_MIN_BUD_LEBS; - - /* - * Orphan nodes are stored in a separate area. One node can store a lot - * of orphan inode numbers, but when new orphan comes we just add a new - * orphan node. At some point the nodes are consolidated into one - * orphan node. - */ - orph_lebs = UBIFS_MIN_ORPH_LEBS; - if (c->leb_cnt - min_leb_cnt > 1) - /* - * For debugging purposes it is better to have at least 2 - * orphan LEBs, because the orphan subsystem would need to do - * consolidations and would be stressed more. - */ - orph_lebs += 1; - - main_lebs = c->leb_cnt - UBIFS_SB_LEBS - UBIFS_MST_LEBS - log_lebs; - main_lebs -= orph_lebs; - - lpt_first = UBIFS_LOG_LNUM + log_lebs; - c->lsave_cnt = DEFAULT_LSAVE_CNT; - c->max_leb_cnt = c->leb_cnt; - err = ubifs_create_dflt_lpt(c, &main_lebs, lpt_first, &lpt_lebs, - &big_lpt, hash_lpt); - if (err) - return err; - - dbg_gen("LEB Properties Tree created (LEBs %d-%d)", lpt_first, - lpt_first + lpt_lebs - 1); - - main_first = c->leb_cnt - main_lebs; - - sup = kzalloc(ALIGN(UBIFS_SB_NODE_SZ, c->min_io_size), GFP_KERNEL); - mst = kzalloc(c->mst_node_alsz, GFP_KERNEL); - idx_node_size = ubifs_idx_node_sz(c, 1); - idx = kzalloc(ALIGN(idx_node_size, c->min_io_size), GFP_KERNEL); - ino = kzalloc(ALIGN(UBIFS_INO_NODE_SZ, c->min_io_size), GFP_KERNEL); - cs = kzalloc(ALIGN(UBIFS_CS_NODE_SZ, c->min_io_size), GFP_KERNEL); - - if (!sup || !mst || !idx || !ino || !cs) { - err = -ENOMEM; - goto out; - } - - /* Create default superblock */ - - tmp64 = (long long)max_buds * c->leb_size; - if (big_lpt) - sup_flags |= UBIFS_FLG_BIGLPT; - if (ubifs_default_version > 4) - sup_flags |= UBIFS_FLG_DOUBLE_HASH; - - if (ubifs_authenticated(c)) { - sup_flags |= UBIFS_FLG_AUTHENTICATION; - sup->hash_algo = cpu_to_le16(c->auth_hash_algo); - err = ubifs_hmac_wkm(c, sup->hmac_wkm); - if (err) - goto out; - } else { - sup->hash_algo = cpu_to_le16(0xffff); - } - - sup->ch.node_type = UBIFS_SB_NODE; - sup->key_hash = UBIFS_KEY_HASH_R5; - sup->flags = cpu_to_le32(sup_flags); - sup->min_io_size = cpu_to_le32(c->min_io_size); - sup->leb_size = cpu_to_le32(c->leb_size); - sup->leb_cnt = cpu_to_le32(c->leb_cnt); - sup->max_leb_cnt = cpu_to_le32(c->max_leb_cnt); - sup->max_bud_bytes = cpu_to_le64(tmp64); - sup->log_lebs = cpu_to_le32(log_lebs); - sup->lpt_lebs = cpu_to_le32(lpt_lebs); - sup->orph_lebs = cpu_to_le32(orph_lebs); - sup->jhead_cnt = cpu_to_le32(DEFAULT_JHEADS_CNT); - sup->fanout = cpu_to_le32(DEFAULT_FANOUT); - sup->lsave_cnt = cpu_to_le32(c->lsave_cnt); - sup->fmt_version = cpu_to_le32(ubifs_default_version); - sup->time_gran = cpu_to_le32(DEFAULT_TIME_GRAN); - if (c->mount_opts.override_compr) - sup->default_compr = cpu_to_le16(c->mount_opts.compr_type); - else - sup->default_compr = cpu_to_le16(get_default_compressor(c)); - - generate_random_uuid(sup->uuid); - - main_bytes = (long long)main_lebs * c->leb_size; - tmp64 = div_u64(main_bytes * DEFAULT_RP_PERCENT, 100); - if (tmp64 > DEFAULT_MAX_RP_SIZE) - tmp64 = DEFAULT_MAX_RP_SIZE; - sup->rp_size = cpu_to_le64(tmp64); - sup->ro_compat_version = cpu_to_le32(UBIFS_RO_COMPAT_VERSION); - - dbg_gen("default superblock created at LEB 0:0"); - - /* Create default master node */ - - mst->ch.node_type = UBIFS_MST_NODE; - mst->log_lnum = cpu_to_le32(UBIFS_LOG_LNUM); - mst->highest_inum = cpu_to_le64(UBIFS_FIRST_INO); - mst->cmt_no = 0; - mst->root_lnum = cpu_to_le32(main_first + DEFAULT_IDX_LEB); - mst->root_offs = 0; - tmp = ubifs_idx_node_sz(c, 1); - mst->root_len = cpu_to_le32(tmp); - mst->gc_lnum = cpu_to_le32(main_first + DEFAULT_GC_LEB); - mst->ihead_lnum = cpu_to_le32(main_first + DEFAULT_IDX_LEB); - mst->ihead_offs = cpu_to_le32(ALIGN(tmp, c->min_io_size)); - mst->index_size = cpu_to_le64(ALIGN(tmp, 8)); - mst->lpt_lnum = cpu_to_le32(c->lpt_lnum); - mst->lpt_offs = cpu_to_le32(c->lpt_offs); - mst->nhead_lnum = cpu_to_le32(c->nhead_lnum); - mst->nhead_offs = cpu_to_le32(c->nhead_offs); - mst->ltab_lnum = cpu_to_le32(c->ltab_lnum); - mst->ltab_offs = cpu_to_le32(c->ltab_offs); - mst->lsave_lnum = cpu_to_le32(c->lsave_lnum); - mst->lsave_offs = cpu_to_le32(c->lsave_offs); - mst->lscan_lnum = cpu_to_le32(main_first); - mst->empty_lebs = cpu_to_le32(main_lebs - 2); - mst->idx_lebs = cpu_to_le32(1); - mst->leb_cnt = cpu_to_le32(c->leb_cnt); - ubifs_copy_hash(c, hash_lpt, mst->hash_lpt); - - /* Calculate lprops statistics */ - tmp64 = main_bytes; - tmp64 -= ALIGN(ubifs_idx_node_sz(c, 1), c->min_io_size); - tmp64 -= ALIGN(UBIFS_INO_NODE_SZ, c->min_io_size); - mst->total_free = cpu_to_le64(tmp64); - - tmp64 = ALIGN(ubifs_idx_node_sz(c, 1), c->min_io_size); - ino_waste = ALIGN(UBIFS_INO_NODE_SZ, c->min_io_size) - - UBIFS_INO_NODE_SZ; - tmp64 += ino_waste; - tmp64 -= ALIGN(ubifs_idx_node_sz(c, 1), 8); - mst->total_dirty = cpu_to_le64(tmp64); - - /* The indexing LEB does not contribute to dark space */ - tmp64 = ((long long)(c->main_lebs - 1) * c->dark_wm); - mst->total_dark = cpu_to_le64(tmp64); - - mst->total_used = cpu_to_le64(UBIFS_INO_NODE_SZ); - - dbg_gen("default master node created at LEB %d:0", UBIFS_MST_LNUM); - - /* Create the root indexing node */ - - c->key_fmt = UBIFS_SIMPLE_KEY_FMT; - c->key_hash = key_r5_hash; - - idx->ch.node_type = UBIFS_IDX_NODE; - idx->child_cnt = cpu_to_le16(1); - ino_key_init(c, &key, UBIFS_ROOT_INO); - br = ubifs_idx_branch(c, idx, 0); - key_write_idx(c, &key, &br->key); - br->lnum = cpu_to_le32(main_first + DEFAULT_DATA_LEB); - br->len = cpu_to_le32(UBIFS_INO_NODE_SZ); - - dbg_gen("default root indexing node created LEB %d:0", - main_first + DEFAULT_IDX_LEB); - - /* Create default root inode */ - - ino_key_init_flash(c, &ino->key, UBIFS_ROOT_INO); - ino->ch.node_type = UBIFS_INO_NODE; - ino->creat_sqnum = cpu_to_le64(++c->max_sqnum); - ino->nlink = cpu_to_le32(2); - - ktime_get_coarse_real_ts64(&ts); - tmp_le64 = cpu_to_le64(ts.tv_sec); - ino->atime_sec = tmp_le64; - ino->ctime_sec = tmp_le64; - ino->mtime_sec = tmp_le64; - ino->atime_nsec = 0; - ino->ctime_nsec = 0; - ino->mtime_nsec = 0; - ino->mode = cpu_to_le32(S_IFDIR | S_IRUGO | S_IWUSR | S_IXUGO); - ino->size = cpu_to_le64(UBIFS_INO_NODE_SZ); - - /* Set compression enabled by default */ - ino->flags = cpu_to_le32(UBIFS_COMPR_FL); - - dbg_gen("root inode created at LEB %d:0", - main_first + DEFAULT_DATA_LEB); - - /* - * The first node in the log has to be the commit start node. This is - * always the case during normal file-system operation. Write a fake - * commit start node to the log. - */ - - cs->ch.node_type = UBIFS_CS_NODE; - - err = ubifs_write_node_hmac(c, sup, UBIFS_SB_NODE_SZ, 0, 0, - offsetof(struct ubifs_sb_node, hmac)); - if (err) - goto out; - - err = ubifs_write_node(c, ino, UBIFS_INO_NODE_SZ, - main_first + DEFAULT_DATA_LEB, 0); - if (err) - goto out; - - ubifs_node_calc_hash(c, ino, hash); - ubifs_copy_hash(c, hash, ubifs_branch_hash(c, br)); - - err = ubifs_write_node(c, idx, idx_node_size, main_first + DEFAULT_IDX_LEB, 0); - if (err) - goto out; - - ubifs_node_calc_hash(c, idx, hash); - ubifs_copy_hash(c, hash, mst->hash_root_idx); - - err = ubifs_write_node_hmac(c, mst, UBIFS_MST_NODE_SZ, UBIFS_MST_LNUM, 0, - offsetof(struct ubifs_mst_node, hmac)); - if (err) - goto out; - - err = ubifs_write_node_hmac(c, mst, UBIFS_MST_NODE_SZ, UBIFS_MST_LNUM + 1, - 0, offsetof(struct ubifs_mst_node, hmac)); - if (err) - goto out; - - err = ubifs_write_node(c, cs, UBIFS_CS_NODE_SZ, UBIFS_LOG_LNUM, 0); - if (err) - goto out; - - ubifs_msg(c, "default file-system created"); - - err = 0; -out: - kfree(sup); - kfree(mst); - kfree(idx); - kfree(ino); - kfree(cs); - - return err; -} - /** * validate_sb - validate superblock node. * @c: UBIFS file-system description object @@ -419,9 +79,9 @@ static int validate_sb(struct ubifs_info *c, struct ubifs_sb_node *sup) min_leb_cnt = UBIFS_SB_LEBS + UBIFS_MST_LEBS + c->log_lebs; min_leb_cnt += c->lpt_lebs + c->orph_lebs + c->jhead_cnt + 6; - if (c->leb_cnt < min_leb_cnt || c->leb_cnt > c->vi.size) { + if (c->leb_cnt < min_leb_cnt || c->leb_cnt > c->vi.rsvd_lebs) { ubifs_err(c, "bad LEB count: %d in superblock, %d on UBI volume, %d minimum required", - c->leb_cnt, c->vi.size, min_leb_cnt); + c->leb_cnt, c->vi.rsvd_lebs, min_leb_cnt); goto failed; } @@ -537,72 +197,19 @@ static struct ubifs_sb_node *ubifs_read_sb_node(struct ubifs_info *c) return sup; } -static int authenticate_sb_node(struct ubifs_info *c, +static int authenticate_sb_node(__unused struct ubifs_info *c, const struct ubifs_sb_node *sup) { unsigned int sup_flags = le32_to_cpu(sup->flags); - u8 hmac_wkm[UBIFS_HMAC_ARR_SZ]; int authenticated = !!(sup_flags & UBIFS_FLG_AUTHENTICATION); - int hash_algo; - int err; - - if (c->authenticated && !authenticated) { - ubifs_err(c, "authenticated FS forced, but found FS without authentication"); - return -EINVAL; - } - - if (!c->authenticated && authenticated) { - ubifs_err(c, "authenticated FS found, but no key given"); - return -EINVAL; - } - - ubifs_msg(c, "Mounting in %sauthenticated mode", - c->authenticated ? "" : "un"); - - if (!c->authenticated) - return 0; - if (!IS_ENABLED(CONFIG_UBIFS_FS_AUTHENTICATION)) + if (authenticated) { + // To be implemented + ubifs_err(c, "not support authentication"); return -EOPNOTSUPP; - - hash_algo = le16_to_cpu(sup->hash_algo); - if (hash_algo >= HASH_ALGO__LAST) { - ubifs_err(c, "superblock uses unknown hash algo %d", - hash_algo); - return -EINVAL; - } - - if (strcmp(hash_algo_name[hash_algo], c->auth_hash_name)) { - ubifs_err(c, "This filesystem uses %s for hashing," - " but %s is specified", hash_algo_name[hash_algo], - c->auth_hash_name); - return -EINVAL; } - /* - * The super block node can either be authenticated by a HMAC or - * by a signature in a ubifs_sig_node directly following the - * super block node to support offline image creation. - */ - if (ubifs_hmac_zero(c, sup->hmac)) { - err = ubifs_sb_verify_signature(c, sup); - } else { - err = ubifs_hmac_wkm(c, hmac_wkm); - if (err) - return err; - if (ubifs_check_hmac(c, hmac_wkm, sup->hmac_wkm)) { - ubifs_err(c, "provided key does not fit"); - return -ENOKEY; - } - err = ubifs_node_verify_hmac(c, sup, sizeof(*sup), - offsetof(struct ubifs_sb_node, - hmac)); - } - - if (err) - ubifs_err(c, "Failed to authenticate superblock: %d", err); - - return err; + return 0; } /** @@ -638,12 +245,6 @@ int ubifs_read_superblock(struct ubifs_info *c) int err, sup_flags; struct ubifs_sb_node *sup; - if (c->empty) { - err = create_default_filesystem(c); - if (err) - return err; - } - sup = ubifs_read_sb_node(c); if (IS_ERR(sup)) return PTR_ERR(sup); @@ -672,13 +273,6 @@ int ubifs_read_superblock(struct ubifs_info *c) err = -EINVAL; goto out; } - - /* - * The FS is mounted R/O, and the media format is - * R/O-compatible with the UBIFS implementation, so we can - * mount. - */ - c->rw_incompat = 1; } if (c->fmt_version < 3) { @@ -722,14 +316,9 @@ int ubifs_read_superblock(struct ubifs_info *c) c->fanout = le32_to_cpu(sup->fanout); c->lsave_cnt = le32_to_cpu(sup->lsave_cnt); c->rp_size = le64_to_cpu(sup->rp_size); - c->rp_uid = make_kuid(&init_user_ns, le32_to_cpu(sup->rp_uid)); - c->rp_gid = make_kgid(&init_user_ns, le32_to_cpu(sup->rp_gid)); sup_flags = le32_to_cpu(sup->flags); - if (!c->mount_opts.override_compr) - c->default_compr = le16_to_cpu(sup->default_compr); + c->default_compr = le16_to_cpu(sup->default_compr); - c->vfs_sb->s_time_gran = le32_to_cpu(sup->time_gran); - memcpy(&c->uuid, &sup->uuid, 16); c->big_lpt = !!(sup_flags & UBIFS_FLG_BIGLPT); c->space_fixup = !!(sup_flags & UBIFS_FLG_SPACE_FIXUP); c->double_hash = !!(sup_flags & UBIFS_FLG_DOUBLE_HASH); @@ -746,18 +335,11 @@ int ubifs_read_superblock(struct ubifs_info *c) goto out; } - if (!IS_ENABLED(CONFIG_FS_ENCRYPTION) && c->encrypted) { - ubifs_err(c, "file system contains encrypted files but UBIFS" - " was built without crypto support."); - err = -EINVAL; - goto out; - } - /* Automatically increase file system size to the maximum size */ - if (c->leb_cnt < c->vi.size && c->leb_cnt < c->max_leb_cnt) { + if (c->leb_cnt < c->vi.rsvd_lebs && c->leb_cnt < c->max_leb_cnt) { int old_leb_cnt = c->leb_cnt; - c->leb_cnt = min_t(int, c->max_leb_cnt, c->vi.size); + c->leb_cnt = min_t(int, c->max_leb_cnt, c->vi.rsvd_lebs); sup->leb_cnt = cpu_to_le32(c->leb_cnt); c->superblock_need_write = 1; @@ -807,7 +389,7 @@ static int fixup_leb(struct ubifs_info *c, int lnum, int len) dbg_mnt("fixup LEB %d, data len %d", lnum, len); err = ubifs_leb_read(c, lnum, c->sbuf, 0, len, 1); - if (err) + if (err && err != -EBADMSG) return err; return ubifs_leb_change(c, lnum, c->sbuf, len); @@ -926,31 +508,3 @@ int ubifs_fixup_free_space(struct ubifs_info *c) ubifs_msg(c, "free space fixup complete"); return err; } - -int ubifs_enable_encryption(struct ubifs_info *c) -{ - int err; - struct ubifs_sb_node *sup = c->sup_node; - - if (!IS_ENABLED(CONFIG_FS_ENCRYPTION)) - return -EOPNOTSUPP; - - if (c->encrypted) - return 0; - - if (c->ro_mount || c->ro_media) - return -EROFS; - - if (c->fmt_version < 5) { - ubifs_err(c, "on-flash format version 5 is needed for encryption"); - return -EINVAL; - } - - sup->flags |= cpu_to_le32(UBIFS_FLG_ENCRYPTION); - - err = ubifs_write_sb_node(c, sup); - if (!err) - c->encrypted = 1; - - return err; -} |