MODSIGN: Add FIPS policy

If we're in FIPS mode, we should panic if we fail to verify the signature on a
module or we're asked to load an unsigned module in signature enforcing mode.
Possibly FIPS mode should automatically enable enforcing mode.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

1 files changed, 4 insertions, 0 deletions

diff --git a/kernel/module.c b/kernel/module.c
index 68c564edb2c1..0e2da8695f8e 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -58,6 +58,7 @@
 #include <linux/jump_label.h>
 #include <linux/pfn.h>
 #include <linux/bsearch.h>
+#include <linux/fips.h>
 #include "module-internal.h"
 
 #define CREATE_TRACE_POINTS
@@ -2447,6 +2448,9 @@ static int module_sig_check(struct load_info *info,
         }
 
         /* Not having a signature is only an error if we're strict. */
+        if (err < 0 && fips_enabled)
+                panic("Module verification failed with error %d in FIPS mode\n",
+                      err);
         if (err == -ENOKEY && !sig_enforce)
                 err = 0;