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authorTyler Hicks <tyhicks@linux.vnet.ibm.com>2009-04-13 15:29:27 -0500
committerTyler Hicks <tyhicks@linux.vnet.ibm.com>2009-04-22 03:54:13 -0500
commit13a791b4e63eb0537a7f804a340d6527485983b4 (patch)
treead3c74093e8efe0da14644a0dc16ac0c61b2e6e5 /fs/ecryptfs/inode.c
parent3a5203ab3c0c31e0f1434c69e893bfb85c6e6657 (diff)
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.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c
index 55b3145b807..5ed86e25b8a 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);