diff options
Diffstat (limited to 'fs/ecryptfs/crypto.c')
| -rw-r--r-- | fs/ecryptfs/crypto.c | 49 |
1 files changed, 32 insertions, 17 deletions
diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c index bdca1f4b3a3..8b65f289ee0 100644 --- a/fs/ecryptfs/crypto.c +++ b/fs/ecryptfs/crypto.c @@ -1324,14 +1324,13 @@ static int ecryptfs_write_headers_virt(char *page_virt, size_t max, } static int -ecryptfs_write_metadata_to_contents(struct ecryptfs_crypt_stat *crypt_stat, - struct dentry *ecryptfs_dentry, - char *virt) +ecryptfs_write_metadata_to_contents(struct dentry *ecryptfs_dentry, + char *virt, size_t virt_len) { int rc; rc = ecryptfs_write_lower(ecryptfs_dentry->d_inode, virt, - 0, crypt_stat->num_header_bytes_at_front); + 0, virt_len); if (rc) printk(KERN_ERR "%s: Error attempting to write header " "information to lower file; rc = [%d]\n", __func__, @@ -1341,7 +1340,6 @@ ecryptfs_write_metadata_to_contents(struct ecryptfs_crypt_stat *crypt_stat, static int ecryptfs_write_metadata_to_xattr(struct dentry *ecryptfs_dentry, - struct ecryptfs_crypt_stat *crypt_stat, char *page_virt, size_t size) { int rc; @@ -1351,6 +1349,17 @@ ecryptfs_write_metadata_to_xattr(struct dentry *ecryptfs_dentry, return rc; } +static unsigned long ecryptfs_get_zeroed_pages(gfp_t gfp_mask, + unsigned int order) +{ + struct page *page; + + page = alloc_pages(gfp_mask | __GFP_ZERO, order); + if (page) + return (unsigned long) page_address(page); + return 0; +} + /** * ecryptfs_write_metadata * @ecryptfs_dentry: The eCryptfs dentry @@ -1367,7 +1376,9 @@ int ecryptfs_write_metadata(struct dentry *ecryptfs_dentry) { struct ecryptfs_crypt_stat *crypt_stat = &ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat; + unsigned int order; char *virt; + size_t virt_len; size_t size = 0; int rc = 0; @@ -1383,33 +1394,35 @@ int ecryptfs_write_metadata(struct dentry *ecryptfs_dentry) rc = -EINVAL; goto out; } + virt_len = crypt_stat->num_header_bytes_at_front; + order = get_order(virt_len); /* Released in this function */ - virt = (char *)get_zeroed_page(GFP_KERNEL); + virt = (char *)ecryptfs_get_zeroed_pages(GFP_KERNEL, order); if (!virt) { printk(KERN_ERR "%s: Out of memory\n", __func__); rc = -ENOMEM; goto out; } - rc = ecryptfs_write_headers_virt(virt, PAGE_CACHE_SIZE, &size, - crypt_stat, ecryptfs_dentry); + rc = ecryptfs_write_headers_virt(virt, virt_len, &size, crypt_stat, + ecryptfs_dentry); if (unlikely(rc)) { printk(KERN_ERR "%s: Error whilst writing headers; rc = [%d]\n", __func__, rc); goto out_free; } if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR) - rc = ecryptfs_write_metadata_to_xattr(ecryptfs_dentry, - crypt_stat, virt, size); + rc = ecryptfs_write_metadata_to_xattr(ecryptfs_dentry, virt, + size); else - rc = ecryptfs_write_metadata_to_contents(crypt_stat, - ecryptfs_dentry, virt); + rc = ecryptfs_write_metadata_to_contents(ecryptfs_dentry, virt, + virt_len); if (rc) { printk(KERN_ERR "%s: Error writing metadata out to lower file; " "rc = [%d]\n", __func__, rc); goto out_free; } out_free: - free_page((unsigned long)virt); + free_pages((unsigned long)virt, order); out: return rc; } @@ -2208,17 +2221,19 @@ int ecryptfs_decode_and_decrypt_filename(char **plaintext_name, struct dentry *ecryptfs_dir_dentry, const char *name, size_t name_size) { + struct ecryptfs_mount_crypt_stat *mount_crypt_stat = + &ecryptfs_superblock_to_private( + ecryptfs_dir_dentry->d_sb)->mount_crypt_stat; char *decoded_name; size_t decoded_name_size; size_t packet_size; int rc = 0; - if ((name_size > ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX_SIZE) + if ((mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) + && !(mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED) + && (name_size > ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX_SIZE) && (strncmp(name, ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX, ECRYPTFS_FNEK_ENCRYPTED_FILENAME_PREFIX_SIZE) == 0)) { - struct ecryptfs_mount_crypt_stat *mount_crypt_stat = - &ecryptfs_superblock_to_private( - ecryptfs_dir_dentry->d_sb)->mount_crypt_stat; const char *orig_name = name; size_t orig_name_size = name_size; |