diff options
| -rw-r--r-- | fs/ubifs/ioctl.c | 5 | ||||
| -rw-r--r-- | fs/ubifs/sb.c | 40 | ||||
| -rw-r--r-- | fs/ubifs/ubifs-media.h | 2 | ||||
| -rw-r--r-- | fs/ubifs/ubifs.h | 3 |
4 files changed, 50 insertions, 0 deletions
diff --git a/fs/ubifs/ioctl.c b/fs/ubifs/ioctl.c index 6bb5b35050de..3d10f5525274 100644 --- a/fs/ubifs/ioctl.c +++ b/fs/ubifs/ioctl.c @@ -183,6 +183,7 @@ long ubifs_ioctl(struct file *file, unsigned int cmd, unsigned long arg) } case FS_IOC_SET_ENCRYPTION_POLICY: { #ifdef CONFIG_UBIFS_FS_ENCRYPTION + struct ubifs_info *c = inode->i_sb->s_fs_info; struct fscrypt_policy policy; if (copy_from_user(&policy, @@ -190,6 +191,10 @@ long ubifs_ioctl(struct file *file, unsigned int cmd, unsigned long arg) sizeof(policy))) return -EFAULT; + err = ubifs_enable_encryption(c); + if (err) + return err; + err = fscrypt_process_policy(file, &policy); return err; diff --git a/fs/ubifs/sb.c b/fs/ubifs/sb.c index 4a2b4c361587..54cef70ea16f 100644 --- a/fs/ubifs/sb.c +++ b/fs/ubifs/sb.c @@ -622,6 +622,16 @@ int ubifs_read_superblock(struct ubifs_info *c) 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); + c->encrypted = !!(sup_flags & UBIFS_FLG_ENCRYPTION); + +#ifndef CONFIG_UBIFS_FS_ENCRYPTION + if (c->encrypted) { + ubifs_err(c, "file system contains encrypted files but UBIFS" + " was built without crypto support."); + err = -EINVAL; + goto out; + } +#endif /* Automatically increase file system size to the maximum size */ c->old_leb_cnt = c->leb_cnt; @@ -809,3 +819,33 @@ 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; + + 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 = ubifs_read_sb_node(c); + if (IS_ERR(sup)) + return PTR_ERR(sup); + + sup->flags |= cpu_to_le32(UBIFS_FLG_ENCRYPTION); + + err = ubifs_write_sb_node(c, sup); + if (!err) + c->encrypted = 1; + kfree(sup); + + return err; +} diff --git a/fs/ubifs/ubifs-media.h b/fs/ubifs/ubifs-media.h index 0cbdc6b70a00..bdc7935a5e41 100644 --- a/fs/ubifs/ubifs-media.h +++ b/fs/ubifs/ubifs-media.h @@ -420,11 +420,13 @@ enum { * UBIFS_FLG_SPACE_FIXUP: first-mount "fixup" of free space within LEBs needed * UBIFS_FLG_DOUBLE_HASH: store a 32bit cookie in directory entry nodes to * support 64bit cookies for lookups by hash + * UBIFS_FLG_ENCRYPTION: this filesystem contains encrypted files */ enum { UBIFS_FLG_BIGLPT = 0x02, UBIFS_FLG_SPACE_FIXUP = 0x04, UBIFS_FLG_DOUBLE_HASH = 0x08, + UBIFS_FLG_ENCRYPTION = 0x10, }; /** diff --git a/fs/ubifs/ubifs.h b/fs/ubifs/ubifs.h index 5089663c0d1b..8d0e4818e3ea 100644 --- a/fs/ubifs/ubifs.h +++ b/fs/ubifs/ubifs.h @@ -1007,6 +1007,7 @@ struct ubifs_debug_info; * @big_lpt: flag that LPT is too big to write whole during commit * @space_fixup: flag indicating that free space in LEBs needs to be cleaned up * @double_hash: flag indicating that we can do lookups by hash + * @encrypted: flag indicating that this file system contains encrypted files * @no_chk_data_crc: do not check CRCs when reading data nodes (except during * recovery) * @bulk_read: enable bulk-reads @@ -1250,6 +1251,7 @@ struct ubifs_info { unsigned int big_lpt:1; unsigned int space_fixup:1; unsigned int double_hash:1; + unsigned int encrypted:1; unsigned int no_chk_data_crc:1; unsigned int bulk_read:1; unsigned int default_compr:2; @@ -1649,6 +1651,7 @@ int ubifs_read_superblock(struct ubifs_info *c); struct ubifs_sb_node *ubifs_read_sb_node(struct ubifs_info *c); int ubifs_write_sb_node(struct ubifs_info *c, struct ubifs_sb_node *sup); int ubifs_fixup_free_space(struct ubifs_info *c); +int ubifs_enable_encryption(struct ubifs_info *c); /* replay.c */ int ubifs_validate_entry(struct ubifs_info *c, |