From: Theodore Ts'o <tytso@mit.edu>
Date: Sat, 13 Jun 2015 03:44:33 +0000 (-0400)
Subject: ext4 crypto: fail the mount if blocksize != pagesize
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=1cb767cd4a79703105f4f3774c76896d621fdc54;p=linux-beck.git

ext4 crypto: fail the mount if blocksize != pagesize

We currently don't correctly handle the case where blocksize !=
pagesize, so disallow the mount in those cases.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
---

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 31e85bea9652..e13fe40d4a51 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -4065,7 +4065,15 @@ no_journal:
 		}
 	}
 
-	if (unlikely(sbi->s_mount_flags & EXT4_MF_TEST_DUMMY_ENCRYPTION) &&
+	if ((DUMMY_ENCRYPTION_ENABLED(sbi) ||
+	     EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_ENCRYPT)) &&
+	    (blocksize != PAGE_CACHE_SIZE)) {
+		ext4_msg(sb, KERN_ERR,
+			 "Unsupported blocksize for fs encryption");
+		goto failed_mount_wq;
+	}
+
+	if (DUMMY_ENCRYPTION_ENABLED(sbi) &&
 	    !(sb->s_flags & MS_RDONLY) &&
 	    !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_ENCRYPT)) {
 		EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_ENCRYPT);