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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/crypto.c
parent3a5203ab3c0c31e0f1434c69e893bfb85c6e6657 (diff)
downloadop-kernel-dev-13a791b4e63eb0537a7f804a340d6527485983b4.zip
op-kernel-dev-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/crypto.c')
-rw-r--r--fs/ecryptfs/crypto.c21
1 files changed, 2 insertions, 19 deletions
diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c
index 8b65f28..b91851f 100644
--- a/fs/ecryptfs/crypto.c
+++ b/fs/ecryptfs/crypto.c
@@ -483,15 +483,7 @@ int ecryptfs_encrypt_page(struct page *page)
ecryptfs_inode = page->mapping->host;
crypt_stat =
&(ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat);
- if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
- rc = ecryptfs_write_lower_page_segment(ecryptfs_inode, page,
- 0, PAGE_CACHE_SIZE);
- if (rc)
- printk(KERN_ERR "%s: Error attempting to copy "
- "page at index [%ld]\n", __func__,
- page->index);
- goto out;
- }
+ BUG_ON(!(crypt_stat->flags & ECRYPTFS_ENCRYPTED));
enc_extent_page = alloc_page(GFP_USER);
if (!enc_extent_page) {
rc = -ENOMEM;
@@ -620,16 +612,7 @@ int ecryptfs_decrypt_page(struct page *page)
ecryptfs_inode = page->mapping->host;
crypt_stat =
&(ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat);
- if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
- rc = ecryptfs_read_lower_page_segment(page, page->index, 0,
- PAGE_CACHE_SIZE,
- ecryptfs_inode);
- if (rc)
- printk(KERN_ERR "%s: Error attempting to copy "
- "page at index [%ld]\n", __func__,
- page->index);
- goto out;
- }
+ BUG_ON(!(crypt_stat->flags & ECRYPTFS_ENCRYPTED));
enc_extent_page = alloc_page(GFP_USER);
if (!enc_extent_page) {
rc = -ENOMEM;
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