- Fix error handling when ecryptfs_read_lower() encounters an error

- Fix read-only file creation when the eCryptfs mount is configured to
   store metadata in xattrs
 - Minor code cleanups
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Merge tag 'ecryptfs-5.3-rc1-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tyhicks/ecryptfs

Pull eCryptfs updates from Tyler Hicks:

 - Fix error handling when ecryptfs_read_lower() encounters an error

 - Fix read-only file creation when the eCryptfs mount is configured to
   store metadata in xattrs

 - Minor code cleanups

* tag 'ecryptfs-5.3-rc1-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tyhicks/ecryptfs:
  ecryptfs: Change return type of ecryptfs_process_flags
  ecryptfs: Make ecryptfs_xattr_handler static
  ecryptfs: remove unnessesary null check in ecryptfs_keyring_auth_tok_for_sig
  ecryptfs: use print_hex_dump_bytes for hexdump
  eCryptfs: fix permission denied with ecryptfs_xattr mount option when create readonly file
  ecryptfs: re-order a condition for static checkers
  eCryptfs: fix a couple type promotion bugs

fs/ecryptfs/crypto.c

@@ -23,6 +23,7 @@
 #include <linux/slab.h>
 #include <asm/unaligned.h>
 #include <linux/kernel.h>
+#include <linux/xattr.h>
 #include "ecryptfs_kernel.h"
 
 #define DECRYPT		0
@@ -860,13 +861,10 @@ static struct ecryptfs_flag_map_elem ecryptfs_flag_map[] = {
  * @crypt_stat: The cryptographic context
  * @page_virt: Source data to be parsed
  * @bytes_read: Updated with the number of bytes read
- *
- * Returns zero on success; non-zero if the flag set is invalid
  */
-static int ecryptfs_process_flags(struct ecryptfs_crypt_stat *crypt_stat,
+static void ecryptfs_process_flags(struct ecryptfs_crypt_stat *crypt_stat,
 				  char *page_virt, int *bytes_read)
 {
-	int rc = 0;
 	int i;
 	u32 flags;
 
@@ -879,7 +877,6 @@ static int ecryptfs_process_flags(struct ecryptfs_crypt_stat *crypt_stat,
 	/* Version is in top 8 bits of the 32-bit flag vector */
 	crypt_stat->file_version = ((flags >> 24) & 0xFF);
 	(*bytes_read) = 4;
-	return rc;
 }
 
 /**
@@ -1004,8 +1001,10 @@ int ecryptfs_read_and_validate_header_region(struct inode *inode)
 
 	rc = ecryptfs_read_lower(file_size, 0, ECRYPTFS_SIZE_AND_MARKER_BYTES,
 				 inode);
-	if (rc < ECRYPTFS_SIZE_AND_MARKER_BYTES)
+	if (rc < 0)
-		return rc >= 0 ? -EINVAL : rc;
+		return rc;
+	else if (rc < ECRYPTFS_SIZE_AND_MARKER_BYTES)
+		return -EINVAL;
 	rc = ecryptfs_validate_marker(marker);
 	if (!rc)
 		ecryptfs_i_size_init(file_size, inode);
@@ -1115,9 +1114,21 @@ ecryptfs_write_metadata_to_xattr(struct dentry *ecryptfs_dentry,
 				 char *page_virt, size_t size)
 {
 	int rc;
+	struct dentry *lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
+	struct inode *lower_inode = d_inode(lower_dentry);
 
-	rc = ecryptfs_setxattr(ecryptfs_dentry, ecryptfs_inode,
+	if (!(lower_inode->i_opflags & IOP_XATTR)) {
-			       ECRYPTFS_XATTR_NAME, page_virt, size, 0);
+		rc = -EOPNOTSUPP;
+		goto out;
+	}
+
+	inode_lock(lower_inode);
+	rc = __vfs_setxattr(lower_dentry, lower_inode, ECRYPTFS_XATTR_NAME,
+			    page_virt, size, 0);
+	if (!rc && ecryptfs_inode)
+		fsstack_copy_attr_all(ecryptfs_inode, lower_inode);
+	inode_unlock(lower_inode);
+out:
 	return rc;
 }
 
@@ -1291,12 +1302,7 @@ static int ecryptfs_read_headers_virt(char *page_virt,
 	if (!(crypt_stat->flags & ECRYPTFS_I_SIZE_INITIALIZED))
 		ecryptfs_i_size_init(page_virt, d_inode(ecryptfs_dentry));
 	offset += MAGIC_ECRYPTFS_MARKER_SIZE_BYTES;
-	rc = ecryptfs_process_flags(crypt_stat, (page_virt + offset),
+	ecryptfs_process_flags(crypt_stat, (page_virt + offset), &bytes_read);
-				    &bytes_read);
-	if (rc) {
-		ecryptfs_printk(KERN_WARNING, "Error processing flags\n");
-		goto out;
-	}
 	if (crypt_stat->file_version > ECRYPTFS_SUPPORTED_FILE_VERSION) {
 		ecryptfs_printk(KERN_WARNING, "File version is [%d]; only "
 				"file version [%d] is supported by this "
@@ -1367,8 +1373,10 @@ int ecryptfs_read_and_validate_xattr_region(struct dentry *dentry,
 				     ecryptfs_inode_to_lower(inode),
 				     ECRYPTFS_XATTR_NAME, file_size,
 				     ECRYPTFS_SIZE_AND_MARKER_BYTES);
-	if (rc < ECRYPTFS_SIZE_AND_MARKER_BYTES)
+	if (rc < 0)
-		return rc >= 0 ? -EINVAL : rc;
+		return rc;
+	else if (rc < ECRYPTFS_SIZE_AND_MARKER_BYTES)
+		return -EINVAL;
 	rc = ecryptfs_validate_marker(marker);
 	if (!rc)
 		ecryptfs_i_size_init(file_size, inode);

fs/ecryptfs/debug.c

@@ -83,25 +83,9 @@ void ecryptfs_dump_auth_tok(struct ecryptfs_auth_tok *auth_tok)
  */
 void ecryptfs_dump_hex(char *data, int bytes)
 {
-	int i = 0;
-	int add_newline = 1;
-
 	if (ecryptfs_verbosity < 1)
 		return;
-	if (bytes != 0) {
-		printk(KERN_DEBUG "0x%.2x.", (unsigned char)data[i]);
-		i++;
-	}
-	while (i < bytes) {
-		printk("0x%.2x.", (unsigned char)data[i]);
-		i++;
-		if (i % 16 == 0) {
-			printk("\n");
-			add_newline = 0;
-		} else
-			add_newline = 1;
-	}
-	if (add_newline)
-		printk("\n");
-}
 
+	print_hex_dump(KERN_DEBUG, "ecryptfs: ", DUMP_PREFIX_OFFSET, 16, 1,
+		       data, bytes, false);
+}

fs/ecryptfs/inode.c

@@ -1121,7 +1121,7 @@ static int ecryptfs_xattr_set(const struct xattr_handler *handler,
 	}
 }
 
-const struct xattr_handler ecryptfs_xattr_handler = {
+static const struct xattr_handler ecryptfs_xattr_handler = {
 	.prefix = "",  /* match anything */
 	.get = ecryptfs_xattr_get,
 	.set = ecryptfs_xattr_set,

fs/ecryptfs/keystore.c

@@ -1048,8 +1048,9 @@ ecryptfs_parse_tag_70_packet(char **filename, size_t *filename_size,
 		       "rc = [%d]\n", __func__, rc);
 		goto out_free_unlock;
 	}
-	while (s->decrypted_filename[s->i] != '\0'
+
-	       && s->i < s->block_aligned_filename_size)
+	while (s->i < s->block_aligned_filename_size &&
+	       s->decrypted_filename[s->i] != '\0')
 		s->i++;
 	if (s->i == s->block_aligned_filename_size) {
 		printk(KERN_WARNING "%s: Invalid tag 70 packet; could not "
@@ -1611,9 +1612,9 @@ int ecryptfs_keyring_auth_tok_for_sig(struct key **auth_tok_key,
 	int rc = 0;
 
 	(*auth_tok_key) = request_key(&key_type_user, sig, NULL);
-	if (!(*auth_tok_key) || IS_ERR(*auth_tok_key)) {
+	if (IS_ERR(*auth_tok_key)) {
 		(*auth_tok_key) = ecryptfs_get_encrypted_key(sig);
-		if (!(*auth_tok_key) || IS_ERR(*auth_tok_key)) {
+		if (IS_ERR(*auth_tok_key)) {
 			printk(KERN_ERR "Could not find key with description: [%s]\n",
 			      sig);
 			rc = process_request_key_err(PTR_ERR(*auth_tok_key));