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authorTheodore Ts'o <tytso@mit.edu>2015-05-31 13:35:02 -0400
committerTheodore Ts'o <tytso@mit.edu>2015-05-31 13:35:02 -0400
commite709e9df64928a99d41da75910b844976a535db7 (patch)
tree3661c61b6709f910f5ef1d365890c120819ac380 /fs/ext4
parent6bc445e0ff44c7e83225124c214d350407e68ccf (diff)
downloadop-kernel-dev-e709e9df64928a99d41da75910b844976a535db7.zip
op-kernel-dev-e709e9df64928a99d41da75910b844976a535db7.tar.gz
ext4 crypto: encrypt tmpfile located in encryption protected directory
Factor out calls to ext4_inherit_context() and move them to __ext4_new_inode(); this fixes a problem where ext4_tmpfile() wasn't calling calling ext4_inherit_context(), so the temporary file wasn't getting protected. Since the blocks for the tmpfile could end up on disk, they really should be protected if the tmpfile is created within the context of an encrypted directory. Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4')
-rw-r--r--fs/ext4/ext4.h9
-rw-r--r--fs/ext4/ialloc.c26
-rw-r--r--fs/ext4/namei.c29
3 files changed, 30 insertions, 34 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 7435ff2..bd8d32d 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -2149,6 +2149,11 @@ static inline int ext4_get_encryption_info(struct inode *inode)
return 0;
}
+static inline struct ext4_crypt_info *ext4_encryption_info(struct inode *inode)
+{
+ return EXT4_I(inode)->i_crypt_info;
+}
+
#else
static inline int ext4_has_encryption_key(struct inode *inode)
{
@@ -2158,6 +2163,10 @@ static inline int ext4_get_encryption_info(struct inode *inode)
{
return 0;
}
+static inline struct ext4_crypt_info *ext4_encryption_info(struct inode *inode)
+{
+ return NULL;
+}
#endif
diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index ddca169..173c1ae 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -726,11 +726,25 @@ struct inode *__ext4_new_inode(handle_t *handle, struct inode *dir,
ext4_group_t i;
ext4_group_t flex_group;
struct ext4_group_info *grp;
+ int encrypt = 0;
/* Cannot create files in a deleted directory */
if (!dir || !dir->i_nlink)
return ERR_PTR(-EPERM);
+ if ((ext4_encrypted_inode(dir) ||
+ DUMMY_ENCRYPTION_ENABLED(EXT4_SB(dir->i_sb))) &&
+ (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))) {
+ err = ext4_get_encryption_info(dir);
+ if (err)
+ return ERR_PTR(err);
+ if (ext4_encryption_info(dir) == NULL)
+ return ERR_PTR(-EPERM);
+ if (!handle)
+ nblocks += EXT4_DATA_TRANS_BLOCKS(dir->i_sb);
+ encrypt = 1;
+ }
+
sb = dir->i_sb;
ngroups = ext4_get_groups_count(sb);
trace_ext4_request_inode(dir, mode);
@@ -996,12 +1010,6 @@ got:
ei->i_block_group = group;
ei->i_last_alloc_group = ~0;
- /* If the directory encrypted, then we should encrypt the inode. */
- if ((S_ISDIR(mode) || S_ISREG(mode) || S_ISLNK(mode)) &&
- (ext4_encrypted_inode(dir) ||
- DUMMY_ENCRYPTION_ENABLED(sbi)))
- ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
-
ext4_set_inode_flags(inode);
if (IS_DIRSYNC(inode))
ext4_handle_sync(handle);
@@ -1063,6 +1071,12 @@ got:
ei->i_datasync_tid = handle->h_transaction->t_tid;
}
+ if (encrypt) {
+ err = ext4_inherit_context(dir, inode);
+ if (err)
+ goto fail_free_drop;
+ }
+
err = ext4_mark_inode_dirty(handle, inode);
if (err) {
ext4_std_error(sb, err);
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 6ab50f8..1e7d65d 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -2437,20 +2437,7 @@ retry:
inode->i_op = &ext4_file_inode_operations;
inode->i_fop = &ext4_file_operations;
ext4_set_aops(inode);
- err = 0;
-#ifdef CONFIG_EXT4_FS_ENCRYPTION
- if (!err && (ext4_encrypted_inode(dir) ||
- DUMMY_ENCRYPTION_ENABLED(EXT4_SB(dir->i_sb)))) {
- err = ext4_inherit_context(dir, inode);
- if (err) {
- clear_nlink(inode);
- unlock_new_inode(inode);
- iput(inode);
- }
- }
-#endif
- if (!err)
- err = ext4_add_nondir(handle, dentry, inode);
+ err = ext4_add_nondir(handle, dentry, inode);
if (!err && IS_DIRSYNC(dir))
ext4_handle_sync(handle);
}
@@ -2631,14 +2618,6 @@ retry:
err = ext4_init_new_dir(handle, dir, inode);
if (err)
goto out_clear_inode;
-#ifdef CONFIG_EXT4_FS_ENCRYPTION
- if (ext4_encrypted_inode(dir) ||
- DUMMY_ENCRYPTION_ENABLED(EXT4_SB(dir->i_sb))) {
- err = ext4_inherit_context(dir, inode);
- if (err)
- goto out_clear_inode;
- }
-#endif
err = ext4_mark_inode_dirty(handle, inode);
if (!err)
err = ext4_add_entry(handle, dentry, inode);
@@ -3106,12 +3085,6 @@ static int ext4_symlink(struct inode *dir,
err = -ENOMEM;
goto err_drop_inode;
}
- err = ext4_inherit_context(dir, inode);
- if (err)
- goto err_drop_inode;
- err = ext4_get_encryption_info(inode);
- if (err)
- goto err_drop_inode;
istr.name = (const unsigned char *) symname;
istr.len = len;
ostr.name = sd->encrypted_path;
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