commit e462ec50cb5fa ("VFS: Differentiate mount flags (MS_*) from
internal superblock flags") reworked the flags that are passed through
do mount, and in the process dropped MS_I_VERSION. Confusingly, things
continue working if the i_version mount option is used because that's
directly passed to ext4 which interprets it, while iversion is turned
into MS_I_VERSION and dropped on the floor. This breaks IMA and EVM and
my heart.
Signed-off-by: Matthew Garrett <mjg59@xxxxxxxxxx>
Cc: David Howells <dhowells@xxxxxxxxxx>
Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
---
fs/namespace.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/fs/namespace.c b/fs/namespace.c
index 3b601f115b6c..d18deb4c410b 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -2825,7 +2825,8 @@ long do_mount(const char *dev_name, const char __user *dir_name,
SB_MANDLOCK |
SB_DIRSYNC |
SB_SILENT |
- SB_POSIXACL);
+ SB_POSIXACL |
+ SB_I_VERSION);
if (flags & MS_REMOUNT)
retval = do_remount(&path, flags, sb_flags, mnt_flags,
--
2.15.0.rc1.287.g2b38de12cc-goog
