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[PATCH] eCryptfs: Encrypted passthrough

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Provide an option to provide a view of the encrypted files such that the
metadata is always in the header of the files, regardless of whether the
metadata is actually in the header or in the extended attribute.  This mode of
operation is useful for applications like incremental backup utilities that do
not preserve the extended attributes when directly accessing the lower files.

With this option enabled, the files under the eCryptfs mount point will be
read-only.

Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Michael Halcrow 2007-02-12 00:53:47 -08:00 • committed by Linus Torvalds
parent dd2a3b7ad9
commit e77a56ddce
5 changed files with 113 additions and 11 deletions
Download patch file Download diff file Expand all files Collapse all files

15
fs/ecryptfs/inode.c
View file

@ -289,6 +289,7 @@ static struct dentry *ecryptfs_lookup(struct inode *dir, struct dentry *dentry,
char *encoded_name;
unsigned int encoded_namelen;
struct ecryptfs_crypt_stat *crypt_stat = NULL;
struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
char *page_virt = NULL;
struct inode *lower_inode;
u64 file_size;
@ -388,8 +389,18 @@ static struct dentry *ecryptfs_lookup(struct inode *dir, struct dentry *dentry,
}
crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR;
}
memcpy(&file_size, page_virt, sizeof(file_size));
file_size = be64_to_cpu(file_size);
mount_crypt_stat = &ecryptfs_superblock_to_private(
dentry->d_sb)->mount_crypt_stat;
if (mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED) {
if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR)
file_size = (crypt_stat->header_extent_size
+ i_size_read(lower_dentry->d_inode));
else
file_size = i_size_read(lower_dentry->d_inode);
} else {
memcpy(&file_size, page_virt, sizeof(file_size));
file_size = be64_to_cpu(file_size);
}
i_size_write(dentry->d_inode, (loff_t)file_size);
kmem_cache_free(ecryptfs_header_cache_2, page_virt);
goto out;