static int get_default_compressor(void) { if (ubifs_compr_present(UBIFS_COMPR_LZO)) return UBIFS_COMPR_LZO; if (ubifs_compr_present(UBIFS_COMPR_ZLIB)) return UBIFS_COMPR_ZLIB; return UBIFS_COMPR_NONE; }
/** * validate_inode - validate inode. * @c: UBIFS file-system description object * @inode: the inode to validate * * This is a helper function for 'ubifs_iget()' which validates various fields * of a newly built inode to make sure they contain sane values and prevent * possible vulnerabilities. Returns zero if the inode is all right and * a non-zero error code if not. */ static int validate_inode(struct ubifs_info *c, const struct inode *inode) { int err; const struct ubifs_inode *ui = ubifs_inode(inode); if (inode->i_size > c->max_inode_sz) { ubifs_err("inode is too large (%lld)", (long long)inode->i_size); return 1; } if (ui->compr_type < 0 || ui->compr_type >= UBIFS_COMPR_TYPES_CNT) { ubifs_err("unknown compression type %d", ui->compr_type); return 2; } if (ui->data_len < 0 || ui->data_len > UBIFS_MAX_INO_DATA) return 4; if (!ubifs_compr_present(ui->compr_type)) { ubifs_warn("inode %lu uses '%s' compression, but it was not " "compiled in", inode->i_ino, ubifs_compr_name(ui->compr_type)); } err = dbg_check_dir_size(c, inode); return err; }
/** * mount_ubifs - mount UBIFS file-system. * @c: UBIFS file-system description object * * This function mounts UBIFS file system. Returns zero in case of success and * a negative error code in case of failure. * * Note, the function does not de-allocate resources it it fails half way * through, and the caller has to do this instead. */ static int mount_ubifs(struct ubifs_info *c) { struct super_block *sb = c->vfs_sb; int err, mounted_read_only = (sb->s_flags & MS_RDONLY); long long x; size_t sz; err = init_constants_early(c); if (err) return err; err = ubifs_debugging_init(c); if (err) return err; err = check_volume_empty(c); if (err) goto out_free; if (c->empty && (mounted_read_only || c->ro_media)) { /* * This UBI volume is empty, and read-only, or the file system * is mounted read-only - we cannot format it. */ ubifs_err("can't format empty UBI volume: read-only %s", c->ro_media ? "UBI volume" : "mount"); err = -EROFS; goto out_free; } if (c->ro_media && !mounted_read_only) { ubifs_err("cannot mount read-write - read-only media"); err = -EROFS; goto out_free; } /* * The requirement for the buffer is that it should fit indexing B-tree * height amount of integers. We assume the height if the TNC tree will * never exceed 64. */ err = -ENOMEM; c->bottom_up_buf = kmalloc(BOTTOM_UP_HEIGHT * sizeof(int), GFP_KERNEL); if (!c->bottom_up_buf) goto out_free; c->sbuf = vmalloc(c->leb_size); if (!c->sbuf) goto out_free; /* * We have to check all CRCs, even for data nodes, when we mount the FS * (specifically, when we are replaying). */ c->always_chk_crc = 1; err = ubifs_read_superblock(c); if (err) goto out_free; /* * Make sure the compressor which is set as default in the superblock * or overridden by mount options is actually compiled in. */ if (!ubifs_compr_present(c->default_compr)) { ubifs_err("'compressor \"%s\" is not compiled in", ubifs_compr_name(c->default_compr)); goto out_free; } dbg_failure_mode_registration(c); err = init_constants_sb(c); if (err) goto out_free; sz = ALIGN(c->max_idx_node_sz, c->min_io_size); sz = ALIGN(sz + c->max_idx_node_sz, c->min_io_size); c->cbuf = kmalloc(sz, GFP_NOFS); if (!c->cbuf) { err = -ENOMEM; goto out_free; } sprintf(c->bgt_name, BGT_NAME_PATTERN, c->vi.ubi_num, c->vi.vol_id); err = ubifs_read_master(c); if (err) goto out_master; init_constants_master(c); if ((c->mst_node->flags & cpu_to_le32(UBIFS_MST_DIRTY)) != 0) { ubifs_msg("recovery needed"); c->need_recovery = 1; } err = ubifs_lpt_init(c, 1, !mounted_read_only); if (err) goto out_lpt; err = dbg_check_idx_size(c, c->old_idx_sz); if (err) goto out_lpt; err = ubifs_replay_journal(c); if (err) goto out_journal; err = ubifs_mount_orphans(c, c->need_recovery, mounted_read_only); if (err) goto out_orphans; if (c->need_recovery) { err = ubifs_recover_size(c); if (err) goto out_orphans; } spin_lock(&ubifs_infos_lock); list_add_tail(&c->infos_list, &ubifs_infos); spin_unlock(&ubifs_infos_lock); if (c->need_recovery) { if (mounted_read_only) ubifs_msg("recovery deferred"); else { c->need_recovery = 0; ubifs_msg("recovery completed"); } } err = dbg_check_filesystem(c); if (err) goto out_infos; c->always_chk_crc = 0; ubifs_msg("mounted UBI device %d, volume %d, name \"%s\"", c->vi.ubi_num, c->vi.vol_id, c->vi.name); if (mounted_read_only) ubifs_msg("mounted read-only"); x = (long long)c->main_lebs * c->leb_size; ubifs_msg("file system size: %lld bytes (%lld KiB, %lld MiB, %d " "LEBs)", x, x >> 10, x >> 20, c->main_lebs); x = (long long)c->log_lebs * c->leb_size + c->max_bud_bytes; ubifs_msg("journal size: %lld bytes (%lld KiB, %lld MiB, %d " "LEBs)", x, x >> 10, x >> 20, c->log_lebs + c->max_bud_cnt); ubifs_msg("media format: w%d/r%d (latest is w%d/r%d)", c->fmt_version, c->ro_compat_version, UBIFS_FORMAT_VERSION, UBIFS_RO_COMPAT_VERSION); ubifs_msg("default compressor: %s", ubifs_compr_name(c->default_compr)); ubifs_msg("reserved for root: %llu bytes (%llu KiB)", c->report_rp_size, c->report_rp_size >> 10); dbg_msg("compiled on: " __DATE__ " at " __TIME__); dbg_msg("min. I/O unit size: %d bytes", c->min_io_size); dbg_msg("LEB size: %d bytes (%d KiB)", c->leb_size, c->leb_size >> 10); dbg_msg("data journal heads: %d", c->jhead_cnt - NONDATA_JHEADS_CNT); dbg_msg("UUID: %02X%02X%02X%02X-%02X%02X" "-%02X%02X-%02X%02X-%02X%02X%02X%02X%02X%02X", c->uuid[0], c->uuid[1], c->uuid[2], c->uuid[3], c->uuid[4], c->uuid[5], c->uuid[6], c->uuid[7], c->uuid[8], c->uuid[9], c->uuid[10], c->uuid[11], c->uuid[12], c->uuid[13], c->uuid[14], c->uuid[15]); dbg_msg("big_lpt %d", c->big_lpt); dbg_msg("log LEBs: %d (%d - %d)", c->log_lebs, UBIFS_LOG_LNUM, c->log_last); dbg_msg("LPT area LEBs: %d (%d - %d)", c->lpt_lebs, c->lpt_first, c->lpt_last); dbg_msg("orphan area LEBs: %d (%d - %d)", c->orph_lebs, c->orph_first, c->orph_last); dbg_msg("main area LEBs: %d (%d - %d)", c->main_lebs, c->main_first, c->leb_cnt - 1); dbg_msg("index LEBs: %d", c->lst.idx_lebs); dbg_msg("total index bytes: %lld (%lld KiB, %lld MiB)", c->old_idx_sz, c->old_idx_sz >> 10, c->old_idx_sz >> 20); dbg_msg("key hash type: %d", c->key_hash_type); dbg_msg("tree fanout: %d", c->fanout); dbg_msg("reserved GC LEB: %d", c->gc_lnum); dbg_msg("first main LEB: %d", c->main_first); dbg_msg("max. znode size %d", c->max_znode_sz); dbg_msg("max. index node size %d", c->max_idx_node_sz); dbg_msg("node sizes: data %zu, inode %zu, dentry %zu", UBIFS_DATA_NODE_SZ, UBIFS_INO_NODE_SZ, UBIFS_DENT_NODE_SZ); dbg_msg("node sizes: trun %zu, sb %zu, master %zu", UBIFS_TRUN_NODE_SZ, UBIFS_SB_NODE_SZ, UBIFS_MST_NODE_SZ); dbg_msg("node sizes: ref %zu, cmt. start %zu, orph %zu", UBIFS_REF_NODE_SZ, UBIFS_CS_NODE_SZ, UBIFS_ORPH_NODE_SZ); dbg_msg("max. node sizes: data %zu, inode %zu dentry %zu", UBIFS_MAX_DATA_NODE_SZ, UBIFS_MAX_INO_NODE_SZ, UBIFS_MAX_DENT_NODE_SZ); dbg_msg("dead watermark: %d", c->dead_wm); dbg_msg("dark watermark: %d", c->dark_wm); dbg_msg("LEB overhead: %d", c->leb_overhead); x = (long long)c->main_lebs * c->dark_wm; dbg_msg("max. dark space: %lld (%lld KiB, %lld MiB)", x, x >> 10, x >> 20); dbg_msg("maximum bud bytes: %lld (%lld KiB, %lld MiB)", c->max_bud_bytes, c->max_bud_bytes >> 10, c->max_bud_bytes >> 20); dbg_msg("BG commit bud bytes: %lld (%lld KiB, %lld MiB)", c->bg_bud_bytes, c->bg_bud_bytes >> 10, c->bg_bud_bytes >> 20); dbg_msg("current bud bytes %lld (%lld KiB, %lld MiB)", c->bud_bytes, c->bud_bytes >> 10, c->bud_bytes >> 20); dbg_msg("max. seq. number: %llu", c->max_sqnum); dbg_msg("commit number: %llu", c->cmt_no); return 0; out_infos: spin_lock(&ubifs_infos_lock); list_del(&c->infos_list); spin_unlock(&ubifs_infos_lock); out_orphans: free_orphans(c); out_journal: out_lpt: ubifs_lpt_free(c, 0); out_master: kfree(c->mst_node); kfree(c->rcvrd_mst_node); if (c->bgt) kthread_stop(c->bgt); kfree(c->cbuf); out_free: vfree(c->ileb_buf); vfree(c->sbuf); kfree(c->bottom_up_buf); ubifs_debugging_exit(c); return err; }