diff options
Diffstat (limited to 'fs/ecryptfs/inode.c')
| -rw-r--r-- | fs/ecryptfs/inode.c | 70 |
1 files changed, 67 insertions, 3 deletions
diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c index 1548be2..e77a2ec 100644 --- a/fs/ecryptfs/inode.c +++ b/fs/ecryptfs/inode.c @@ -282,7 +282,7 @@ static struct dentry *ecryptfs_lookup(struct inode *dir, struct dentry *dentry, struct dentry *lower_dentry; struct vfsmount *lower_mnt; char *encoded_name; - unsigned int encoded_namelen; + int encoded_namelen; struct ecryptfs_crypt_stat *crypt_stat = NULL; struct ecryptfs_mount_crypt_stat *mount_crypt_stat; char *page_virt = NULL; @@ -473,7 +473,7 @@ static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, struct dentry *lower_dir_dentry; umode_t mode; char *encoded_symname; - unsigned int encoded_symlen; + int encoded_symlen; struct ecryptfs_crypt_stat *crypt_stat = NULL; lower_dentry = ecryptfs_dentry_to_lower(dentry); @@ -800,6 +800,25 @@ int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) goto out_fput; } } else { /* new_length < i_size_read(inode) */ + pgoff_t index = 0; + int end_pos_in_page = -1; + + if (new_length != 0) { + index = ((new_length - 1) >> PAGE_CACHE_SHIFT); + end_pos_in_page = ((new_length - 1) & ~PAGE_CACHE_MASK); + } + if (end_pos_in_page != (PAGE_CACHE_SIZE - 1)) { + if ((rc = ecryptfs_write_zeros(&fake_ecryptfs_file, + index, + (end_pos_in_page + 1), + ((PAGE_CACHE_SIZE - 1) + - end_pos_in_page)))) { + printk(KERN_ERR "Error attempting to zero out " + "the remainder of the end page on " + "reducing truncate; rc = [%d]\n", rc); + goto out_fput; + } + } vmtruncate(inode, new_length); rc = ecryptfs_write_inode_size_to_metadata( lower_file, lower_dentry->d_inode, inode, dentry, @@ -875,9 +894,54 @@ static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) struct ecryptfs_crypt_stat *crypt_stat; crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; - lower_dentry = ecryptfs_dentry_to_lower(dentry); + if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) + ecryptfs_init_crypt_stat(crypt_stat); inode = dentry->d_inode; lower_inode = ecryptfs_inode_to_lower(inode); + lower_dentry = ecryptfs_dentry_to_lower(dentry); + mutex_lock(&crypt_stat->cs_mutex); + if (S_ISDIR(dentry->d_inode->i_mode)) + crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); + else if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) + || !(crypt_stat->flags & ECRYPTFS_KEY_VALID)) { + struct vfsmount *lower_mnt; + struct file *lower_file = NULL; + struct ecryptfs_mount_crypt_stat *mount_crypt_stat; + int lower_flags; + + lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry); + lower_flags = O_RDONLY; + if ((rc = ecryptfs_open_lower_file(&lower_file, lower_dentry, + lower_mnt, lower_flags))) { + printk(KERN_ERR + "Error opening lower file; rc = [%d]\n", rc); + mutex_unlock(&crypt_stat->cs_mutex); + goto out; + } + mount_crypt_stat = &ecryptfs_superblock_to_private( + dentry->d_sb)->mount_crypt_stat; + if ((rc = ecryptfs_read_metadata(dentry, lower_file))) { + if (!(mount_crypt_stat->flags + & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { + rc = -EIO; + printk(KERN_WARNING "Attempt to read file that " + "is not in a valid eCryptfs format, " + "and plaintext passthrough mode is not " + "enabled; returning -EIO\n"); + + mutex_unlock(&crypt_stat->cs_mutex); + fput(lower_file); + goto out; + } + rc = 0; + crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); + mutex_unlock(&crypt_stat->cs_mutex); + fput(lower_file); + goto out; + } + fput(lower_file); + } + mutex_unlock(&crypt_stat->cs_mutex); if (ia->ia_valid & ATTR_SIZE) { ecryptfs_printk(KERN_DEBUG, "ia->ia_valid = [0x%x] ATTR_SIZE" " = [0x%x]\n", |
