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| author | Tyler Hicks <tyhicks@linux.vnet.ibm.com> | 2009-04-13 15:29:27 -0500 |
|---|---|---|
| committer | Tyler Hicks <tyhicks@linux.vnet.ibm.com> | 2009-04-22 03:54:13 -0500 |
| commit | 13a791b4e63eb0537a7f804a340d6527485983b4 (patch) | |
| tree | ad3c74093e8efe0da14644a0dc16ac0c61b2e6e5 /fs/ecryptfs/inode.c | |
| parent | 3a5203ab3c0c31e0f1434c69e893bfb85c6e6657 (diff) | |
| download | linux-13a791b4e63eb0537a7f804a340d6527485983b4.tar.gz | |
eCryptfs: Fix data corruption when using ecryptfs_passthrough
ecryptfs_passthrough is a mount option that allows eCryptfs to allow
data to be written to non-eCryptfs files in the lower filesystem. The
passthrough option was causing data corruption due to it not always
being treated as a non-eCryptfs file.
The first 8 bytes of an eCryptfs file contains the decrypted file size.
This value was being written to the non-eCryptfs files, too. Also,
extra 0x00 characters were being written to make the file size a
multiple of PAGE_CACHE_SIZE.
Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
Diffstat (limited to 'fs/ecryptfs/inode.c')
| -rw-r--r-- | fs/ecryptfs/inode.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c index 55b3145b807211..5ed86e25b8a2d7 100644 --- a/fs/ecryptfs/inode.c +++ b/fs/ecryptfs/inode.c @@ -814,6 +814,13 @@ int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) size_t num_zeros = (PAGE_CACHE_SIZE - (new_length & ~PAGE_CACHE_MASK)); + if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { + rc = vmtruncate(inode, new_length); + if (rc) + goto out_free; + rc = vmtruncate(lower_dentry->d_inode, new_length); + goto out_free; + } if (num_zeros) { char *zeros_virt; @@ -915,8 +922,6 @@ static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) } rc = 0; crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); - mutex_unlock(&crypt_stat->cs_mutex); - goto out; } } mutex_unlock(&crypt_stat->cs_mutex); |