@@ -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;
@@ -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;
+}
@@ -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,
};
/**
@@ -1016,6 +1016,7 @@ 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
@@ -1259,6 +1260,7 @@ 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;
@@ -1658,6 +1660,7 @@ 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,
This feature flag indicates that the filesystem contains encrypted files. Signed-off-by: Richard Weinberger <richard@nod.at> --- fs/ubifs/ioctl.c | 5 +++++ fs/ubifs/sb.c | 40 ++++++++++++++++++++++++++++++++++++++++ fs/ubifs/ubifs-media.h | 2 ++ fs/ubifs/ubifs.h | 3 +++ 4 files changed, 50 insertions(+)