Hi Tushar,

On Wed, 2020-09-23 at 12:20 -0700, Tushar Sugandhi wrote:

ima_match_rule_data() permits the func to pass empty func_data.
For instance, for the following func, the func_data keyrings= is
optional.
    measure func=KEY_CHECK keyrings=.ima

But a new func in future may want to constrain the func_data to
be non-empty.  ima_match_rule_data() should support this constraint
and it shouldn't be hard-coded in ima_match_rule_data().

Update ima_match_rule_data() to conditionally allow empty func_data
for the func that needs it.

Signed-off-by: Tushar Sugandhi <redacted>

Policy rules may constrain what is measured, but that decision should
be left to the system owner or admin.

Mimi