1 files changed, 32 insertions, 42 deletions

diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c
index b8d5c8091024..58609bde3b9f 100644
--- a/fs/ecryptfs/crypto.c
+++ b/fs/ecryptfs/crypto.c
@@ -1024,25 +1024,25 @@ out:
 }
 
 /**
- * contains_ecryptfs_marker - check for the ecryptfs marker
+ * ecryptfs_validate_marker - check for the ecryptfs marker
  * @data: The data block in which to check
  *
- * Returns one if marker found; zero if not found
+ * Returns zero if marker found; -EINVAL if not found
  */
-static int contains_ecryptfs_marker(char *data)
+static int ecryptfs_validate_marker(char *data)
 {
         u32 m_1, m_2;
 
         m_1 = get_unaligned_be32(data);
         m_2 = get_unaligned_be32(data + 4);
         if ((m_1 ^ MAGIC_ECRYPTFS_MARKER) == m_2)
-                return 1;
+                return 0;
         ecryptfs_printk(KERN_DEBUG, "m_1 = [0x%.8x]; m_2 = [0x%.8x]; "
                         "MAGIC_ECRYPTFS_MARKER = [0x%.8x]\n", m_1, m_2,
                         MAGIC_ECRYPTFS_MARKER);
         ecryptfs_printk(KERN_DEBUG, "(m_1 ^ MAGIC_ECRYPTFS_MARKER) = "
                         "[0x%.8x]\n", (m_1 ^ MAGIC_ECRYPTFS_MARKER));
-        return 0;
+        return -EINVAL;
 }
 
 struct ecryptfs_flag_map_elem {
@@ -1201,27 +1201,19 @@ int ecryptfs_cipher_code_to_string(char *str, u8 cipher_code)
         return rc;
 }
 
-int ecryptfs_read_and_validate_header_region(char *data,
-                                             struct inode *ecryptfs_inode)
+int ecryptfs_read_and_validate_header_region(struct inode *inode)
 {
-        struct ecryptfs_crypt_stat *crypt_stat =
-                &(ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat);
+        u8 file_size[ECRYPTFS_SIZE_AND_MARKER_BYTES];
+        u8 *marker = file_size + ECRYPTFS_FILE_SIZE_BYTES;
         int rc;
 
-        if (crypt_stat->extent_size == 0)
-                crypt_stat->extent_size = ECRYPTFS_DEFAULT_EXTENT_SIZE;
-        rc = ecryptfs_read_lower(data, 0, crypt_stat->extent_size,
-                                 ecryptfs_inode);
-        if (rc < 0) {
-                printk(KERN_ERR "%s: Error reading header region; rc = [%d]\n",
-                       __func__, rc);
-                goto out;
-        }
-        if (!contains_ecryptfs_marker(data + ECRYPTFS_FILE_SIZE_BYTES)) {
-                rc = -EINVAL;
-        } else
-                rc = 0;
-out:
+        rc = ecryptfs_read_lower(file_size, 0, ECRYPTFS_SIZE_AND_MARKER_BYTES,
+                                 inode);
+        if (rc < ECRYPTFS_SIZE_AND_MARKER_BYTES)
+                return rc >= 0 ? -EINVAL : rc;
+        rc = ecryptfs_validate_marker(marker);
+        if (!rc)
+                ecryptfs_i_size_init(file_size, inode);
         return rc;
 }
 
@@ -1242,8 +1234,7 @@ ecryptfs_write_header_metadata(char *virt,
         (*written) = 6;
 }
 
-struct kmem_cache *ecryptfs_header_cache_1;
-struct kmem_cache *ecryptfs_header_cache_2;
+struct kmem_cache *ecryptfs_header_cache;
 
 /**
  * ecryptfs_write_headers_virt
@@ -1496,11 +1487,9 @@ static int ecryptfs_read_headers_virt(char *page_virt,
         crypt_stat->mount_crypt_stat = &ecryptfs_superblock_to_private(
                 ecryptfs_dentry->d_sb)->mount_crypt_stat;
         offset = ECRYPTFS_FILE_SIZE_BYTES;
-        rc = contains_ecryptfs_marker(page_virt + offset);
-        if (rc == 0) {
-                rc = -EINVAL;
+        rc = ecryptfs_validate_marker(page_virt + offset);
+        if (rc)
                 goto out;
-        }
         if (!(crypt_stat->flags & ECRYPTFS_I_SIZE_INITIALIZED))
                 ecryptfs_i_size_init(page_virt, ecryptfs_dentry->d_inode);
         offset += MAGIC_ECRYPTFS_MARKER_SIZE_BYTES;
@@ -1567,20 +1556,21 @@ out:
         return rc;
 }
 
-int ecryptfs_read_and_validate_xattr_region(char *page_virt,
-                                            struct dentry *ecryptfs_dentry)
+int ecryptfs_read_and_validate_xattr_region(struct dentry *dentry,
+                                            struct inode *inode)
 {
+        u8 file_size[ECRYPTFS_SIZE_AND_MARKER_BYTES];
+        u8 *marker = file_size + ECRYPTFS_FILE_SIZE_BYTES;
         int rc;
 
-        rc = ecryptfs_read_xattr_region(page_virt, ecryptfs_dentry->d_inode);
-        if (rc)
-                goto out;
-        if (!contains_ecryptfs_marker(page_virt + ECRYPTFS_FILE_SIZE_BYTES)) {
-                printk(KERN_WARNING "Valid data found in [%s] xattr, but "
-                        "the marker is invalid\n", ECRYPTFS_XATTR_NAME);
-                rc = -EINVAL;
-        }
-out:
+        rc = ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry),
+                                     ECRYPTFS_XATTR_NAME, file_size,
+                                     ECRYPTFS_SIZE_AND_MARKER_BYTES);
+        if (rc < ECRYPTFS_SIZE_AND_MARKER_BYTES)
+                return rc >= 0 ? -EINVAL : rc;
+        rc = ecryptfs_validate_marker(marker);
+        if (!rc)
+                ecryptfs_i_size_init(file_size, inode);
         return rc;
 }
 
@@ -1610,7 +1600,7 @@ int ecryptfs_read_metadata(struct dentry *ecryptfs_dentry)
         ecryptfs_copy_mount_wide_flags_to_inode_flags(crypt_stat,
                                                       mount_crypt_stat);
         /* Read the first page from the underlying file */
-        page_virt = kmem_cache_alloc(ecryptfs_header_cache_1, GFP_USER);
+        page_virt = kmem_cache_alloc(ecryptfs_header_cache, GFP_USER);
         if (!page_virt) {
                 rc = -ENOMEM;
                 printk(KERN_ERR "%s: Unable to allocate page_virt\n",
@@ -1655,7 +1645,7 @@ int ecryptfs_read_metadata(struct dentry *ecryptfs_dentry)
 out:
         if (page_virt) {
                 memset(page_virt, 0, PAGE_CACHE_SIZE);
-                kmem_cache_free(ecryptfs_header_cache_1, page_virt);
+                kmem_cache_free(ecryptfs_header_cache, page_virt);
         }
         return rc;
 }