mdadm: block creation with long names

This fixes buffer overflows in create_mddev(). It prohibits
creation with not supported names for DDF and native. For IMSM,
mdadm will do silent cut to 16 later.

Signed-off-by: Mariusz Tkaczyk <mariusz.tkaczyk@linux.intel.com>
Signed-off-by: Blazej Kucman <blazej.kucman@intel.com>
Signed-off-by: Jes Sorensen <jsorensen@fb.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/mdadm.h b/mdadm.h
index 54567396..c7268a71 100644
--- a/mdadm.h
+++ b/mdadm.h
@@ -1880,3 +1880,8 @@ enum r0layout {
 #define INVALID_SECTORS 1
 /* And another special number needed for --data_offset=variable */
 #define VARIABLE_OFFSET 3
+
+/**
+ * This is true for native and DDF, IMSM allows 16.
+ */
+#define MD_NAME_MAX 32