ext4: only allow test_dummy_encryption when supported

commit 5f41fdaea63ddf96d921ab36b2af4a90ccdb5744 upstream.

Make the test_dummy_encryption mount option require that the encrypt
feature flag be already enabled on the filesystem, rather than
automatically enabling it.  Practically, this means that "-O encrypt"
will need to be included in MKFS_OPTIONS when running xfstests with the
test_dummy_encryption mount option.  (ext4/053 also needs an update.)

Moreover, as long as the preconditions for test_dummy_encryption are
being tightened anyway, take the opportunity to start rejecting it when
!CONFIG_FS_ENCRYPTION rather than ignoring it.

The motivation for requiring the encrypt feature flag is that:

- Having the filesystem auto-enable feature flags is problematic, as it
  bypasses the usual sanity checks.  The specific issue which came up
  recently is that in kernel versions where ext4 supports casefold but
  not encrypt+casefold (v5.1 through v5.10), the kernel will happily add
  the encrypt flag to a filesystem that has the casefold flag, making it
  unmountable -- but only for subsequent mounts, not the initial one.
  This confused the casefold support detection in xfstests, causing
  generic/556 to fail rather than be skipped.

- The xfstests-bld test runners (kvm-xfstests et al.) already use the
  required mkfs flag, so they will not be affected by this change.  Only
  users of test_dummy_encryption alone will be affected.  But, this
  option has always been for testing only, so it should be fine to
  require that the few users of this option update their test scripts.

- f2fs already requires it (for its equivalent feature flag).

Signed-off-by: Eric Biggers <ebiggers@google.com>
Reviewed-by: Gabriel Krisman Bertazi <krisman@collabora.com>
Link: https://lore.kernel.org/r/20220519204437.61645-1-ebiggers@kernel.org
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index a0a9878578949183c876d2e77a663024c71633cc..2d84030d7b7fc0695ebac6dca77ecd1e83d17a45 100644 (file)
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1435,12 +1435,6 @@ struct ext4_super_block {
 
 #ifdef __KERNEL__
 
-#ifdef CONFIG_FS_ENCRYPTION
-#define DUMMY_ENCRYPTION_ENABLED(sbi) ((sbi)->s_dummy_enc_policy.policy != NULL)
-#else
-#define DUMMY_ENCRYPTION_ENABLED(sbi) (0)
-#endif
-
 /* Number of quota types we support */
 #define EXT4_MAXQUOTAS 3
 

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 2c12ec7bd077d1a4dacc1ab6d5701956eb36c8aa..91b83749ee1113938505a3d8f1a0ea97a045cb9c 100644 (file)
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -2059,6 +2059,12 @@ static int ext4_set_test_dummy_encryption(struct super_block *sb,
        struct ext4_sb_info *sbi = EXT4_SB(sb);
        int err;
 
+       if (!ext4_has_feature_encrypt(sb)) {
+               ext4_msg(sb, KERN_WARNING,
+                        "test_dummy_encryption requires encrypt feature");
+               return -1;
+       }
+
        /*
         * This mount option is just for testing, and it's not worthwhile to
         * implement the extra complexity (e.g. RCU protection) that would be
@@ -2086,11 +2092,13 @@ static int ext4_set_test_dummy_encryption(struct super_block *sb,
                return -1;
        }
        ext4_msg(sb, KERN_WARNING, "Test dummy encryption mode enabled");
+       return 1;
 #else
        ext4_msg(sb, KERN_WARNING,
-                "Test dummy encryption mount option ignored");
+                "test_dummy_encryption option not supported");
+       return -1;
+
 #endif
-       return 1;
 }
 
 struct ext4_parsed_options {
@@ -4784,12 +4792,6 @@ no_journal:
                goto failed_mount_wq;
        }
 
-       if (DUMMY_ENCRYPTION_ENABLED(sbi) && !sb_rdonly(sb) &&
-           !ext4_has_feature_encrypt(sb)) {
-               ext4_set_feature_encrypt(sb);
-               ext4_commit_super(sb);
-       }
-
        /*
         * Get the # of file system overhead blocks from the
         * superblock if present.