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fscrypto: only allow setting encryption policy on directories 

The FS_IOC_SET_ENCRYPTION_POLICY ioctl allowed setting an encryption
policy on nondirectory files.  This was unintentional, and in the case
of nonempty regular files did not behave as expected because existing
data was not actually encrypted by the ioctl.

In the case of ext4, the user could also trigger filesystem errors in
->empty_dir(), e.g. due to mismatched "directory" checksums when the
kernel incorrectly tried to interpret a regular file as a directory.

This bug affected ext4 with kernels v4.8-rc1 or later and f2fs with
kernels v4.6 and later.  It appears that older kernels only permitted
directories and that the check was accidentally lost during the
refactoring to share the file encryption code between ext4 and f2fs.

This patch restores the !S_ISDIR() check that was present in older
kernels.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Cc: stable@vger.kernel.org
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Eric Biggers 2016-09-08 11:36:39 -07:00 committed by Theodore Ts'o
parent 163ae1c6ad
commit 002ced4be6
1 changed files with 2 additions and 0 deletions
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2
fs/crypto/policy.c
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@ -102,6 +102,8 @@ int fscrypt_process_policy(struct inode *inode,
return -EINVAL;
if (!inode_has_encryption_context(inode)) {
if (!S_ISDIR(inode->i_mode))
return -EINVAL;
if (!inode->i_sb->s_cop->empty_dir)
return -EOPNOTSUPP;
if (!inode->i_sb->s_cop->empty_dir(inode))