fs: Disable many filesystems under lockdown

The idea is to permit the following: btrfs, cpio, exfat, ext, f2fs, fat,
hfsplus, iso9660, squash4, tar, xfs and zfs.

The JFS, ReiserFS, romfs, UDF and UFS security vulnerabilities were
reported by Jonathan Bar Or <jonathanbaror@gmail.com>.

Fixes: CVE-2025-0677
Fixes: CVE-2025-0684
Fixes: CVE-2025-0685
Fixes: CVE-2025-0686
Fixes: CVE-2025-0689

Suggested-by: Daniel Axtens <dja@axtens.net>
Signed-off-by: Daniel Axtens <dja@axtens.net>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

grub-core/fs/affs.c

@@ -26,6 +26,7 @@
 #include <grub/types.h>
 #include <grub/fshelp.h>
 #include <grub/charset.h>
+#include <grub/lockdown.h>
 
 GRUB_MOD_LICENSE ("GPLv3+");
 
@@ -703,12 +704,16 @@ static struct grub_fs grub_affs_fs =
 
 GRUB_MOD_INIT(affs)
 {
-  grub_affs_fs.mod = mod;
+  if (!grub_is_lockdown ())
-  grub_fs_register (&grub_affs_fs);
+    {
+      grub_affs_fs.mod = mod;
+      grub_fs_register (&grub_affs_fs);
+    }
   my_mod = mod;
 }
 
 GRUB_MOD_FINI(affs)
 {
-  grub_fs_unregister (&grub_affs_fs);
+  if (!grub_is_lockdown ())
+    grub_fs_unregister (&grub_affs_fs);
 }

grub-core/fs/cbfs.c

@@ -26,6 +26,7 @@
 #include <grub/dl.h>
 #include <grub/i18n.h>
 #include <grub/cbfs_core.h>
+#include <grub/lockdown.h>
 
 GRUB_MOD_LICENSE ("GPLv3+");
 
@@ -390,13 +391,17 @@ GRUB_MOD_INIT (cbfs)
 #if (defined (__i386__) || defined (__x86_64__)) && !defined (GRUB_UTIL) && !defined (GRUB_MACHINE_EMU) && !defined (GRUB_MACHINE_XEN)
   init_cbfsdisk ();
 #endif
-  grub_cbfs_fs.mod = mod;
+  if (!grub_is_lockdown ())
-  grub_fs_register (&grub_cbfs_fs);
+    {
+      grub_cbfs_fs.mod = mod;
+      grub_fs_register (&grub_cbfs_fs);
+    }
 }
 
 GRUB_MOD_FINI (cbfs)
 {
-  grub_fs_unregister (&grub_cbfs_fs);
+  if (!grub_is_lockdown ())
+    grub_fs_unregister (&grub_cbfs_fs);
 #if (defined (__i386__) || defined (__x86_64__)) && !defined (GRUB_UTIL) && !defined (GRUB_MACHINE_EMU) && !defined (GRUB_MACHINE_XEN)
   fini_cbfsdisk ();
 #endif

grub-core/fs/jfs.c

@@ -26,6 +26,7 @@
 #include <grub/types.h>
 #include <grub/charset.h>
 #include <grub/i18n.h>
+#include <grub/lockdown.h>
 
 GRUB_MOD_LICENSE ("GPLv3+");
 
@@ -1004,12 +1005,16 @@ static struct grub_fs grub_jfs_fs =
 
 GRUB_MOD_INIT(jfs)
 {
-  grub_jfs_fs.mod = mod;
+  if (!grub_is_lockdown ())
-  grub_fs_register (&grub_jfs_fs);
+    {
+      grub_jfs_fs.mod = mod;
+      grub_fs_register (&grub_jfs_fs);
+    }
   my_mod = mod;
 }
 
 GRUB_MOD_FINI(jfs)
 {
-  grub_fs_unregister (&grub_jfs_fs);
+  if (!grub_is_lockdown ())
+    grub_fs_unregister (&grub_jfs_fs);
 }

grub-core/fs/minix.c

@@ -25,6 +25,7 @@
 #include <grub/dl.h>
 #include <grub/types.h>
 #include <grub/i18n.h>
+#include <grub/lockdown.h>
 
 GRUB_MOD_LICENSE ("GPLv3+");
 
@@ -734,8 +735,11 @@ GRUB_MOD_INIT(minix)
 #endif
 #endif
 {
-  grub_minix_fs.mod = mod;
+  if (!grub_is_lockdown ())
-  grub_fs_register (&grub_minix_fs);
+    {
+      grub_minix_fs.mod = mod;
+      grub_fs_register (&grub_minix_fs);
+    }
   my_mod = mod;
 }
 
@@ -757,5 +761,6 @@ GRUB_MOD_FINI(minix)
 #endif
 #endif
 {
-  grub_fs_unregister (&grub_minix_fs);
+  if (!grub_is_lockdown ())
+    grub_fs_unregister (&grub_minix_fs);
 }

grub-core/fs/nilfs2.c

@@ -34,6 +34,7 @@
 #include <grub/dl.h>
 #include <grub/types.h>
 #include <grub/fshelp.h>
+#include <grub/lockdown.h>
 
 GRUB_MOD_LICENSE ("GPLv3+");
 
@@ -1231,12 +1232,16 @@ GRUB_MOD_INIT (nilfs2)
 				  grub_nilfs2_dat_entry));
   COMPILE_TIME_ASSERT (1 << LOG_INODE_SIZE
 		       == sizeof (struct grub_nilfs2_inode));
-  grub_nilfs2_fs.mod = mod;
+  if (!grub_is_lockdown ())
-  grub_fs_register (&grub_nilfs2_fs);
+    {
+      grub_nilfs2_fs.mod = mod;
+      grub_fs_register (&grub_nilfs2_fs);
+    }
   my_mod = mod;
 }
 
 GRUB_MOD_FINI (nilfs2)
 {
-  grub_fs_unregister (&grub_nilfs2_fs);
+  if (!grub_is_lockdown ())
+    grub_fs_unregister (&grub_nilfs2_fs);
 }

grub-core/fs/ntfs.c

@@ -27,6 +27,7 @@
 #include <grub/fshelp.h>
 #include <grub/ntfs.h>
 #include <grub/charset.h>
+#include <grub/lockdown.h>
 
 GRUB_MOD_LICENSE ("GPLv3+");
 
@@ -1541,12 +1542,16 @@ static struct grub_fs grub_ntfs_fs =
 
 GRUB_MOD_INIT (ntfs)
 {
-  grub_ntfs_fs.mod = mod;
+  if (!grub_is_lockdown ())
-  grub_fs_register (&grub_ntfs_fs);
+    {
+      grub_ntfs_fs.mod = mod;
+      grub_fs_register (&grub_ntfs_fs);
+    }
   my_mod = mod;
 }
 
 GRUB_MOD_FINI (ntfs)
 {
-  grub_fs_unregister (&grub_ntfs_fs);
+  if (!grub_is_lockdown ())
+    grub_fs_unregister (&grub_ntfs_fs);
 }

grub-core/fs/reiserfs.c

@@ -39,6 +39,7 @@
 #include <grub/types.h>
 #include <grub/fshelp.h>
 #include <grub/i18n.h>
+#include <grub/lockdown.h>
 
 GRUB_MOD_LICENSE ("GPLv3+");
 
@@ -1417,12 +1418,16 @@ static struct grub_fs grub_reiserfs_fs =
 
 GRUB_MOD_INIT(reiserfs)
 {
-  grub_reiserfs_fs.mod = mod;
+  if (!grub_is_lockdown ())
-  grub_fs_register (&grub_reiserfs_fs);
+    {
+      grub_reiserfs_fs.mod = mod;
+      grub_fs_register (&grub_reiserfs_fs);
+    }
   my_mod = mod;
 }
 
 GRUB_MOD_FINI(reiserfs)
 {
-  grub_fs_unregister (&grub_reiserfs_fs);
+  if (!grub_is_lockdown ())
+    grub_fs_unregister (&grub_reiserfs_fs);
 }

grub-core/fs/romfs.c

@@ -23,6 +23,7 @@
 #include <grub/disk.h>
 #include <grub/fs.h>
 #include <grub/fshelp.h>
+#include <grub/lockdown.h>
 
 GRUB_MOD_LICENSE ("GPLv3+");
 
@@ -475,11 +476,15 @@ static struct grub_fs grub_romfs_fs =
 
 GRUB_MOD_INIT(romfs)
 {
-  grub_romfs_fs.mod = mod;
+  if (!grub_is_lockdown ())
-  grub_fs_register (&grub_romfs_fs);
+    {
+      grub_romfs_fs.mod = mod;
+      grub_fs_register (&grub_romfs_fs);
+    }
 }
 
 GRUB_MOD_FINI(romfs)
 {
-  grub_fs_unregister (&grub_romfs_fs);
+  if (!grub_is_lockdown ())
+    grub_fs_unregister (&grub_romfs_fs);
 }

grub-core/fs/sfs.c

@@ -26,6 +26,7 @@
 #include <grub/types.h>
 #include <grub/fshelp.h>
 #include <grub/charset.h>
+#include <grub/lockdown.h>
 #include <grub/safemath.h>
 
 GRUB_MOD_LICENSE ("GPLv3+");
@@ -779,12 +780,16 @@ static struct grub_fs grub_sfs_fs =
 
 GRUB_MOD_INIT(sfs)
 {
-  grub_sfs_fs.mod = mod;
+  if (!grub_is_lockdown ())
-  grub_fs_register (&grub_sfs_fs);
+    {
+      grub_sfs_fs.mod = mod;
+      grub_fs_register (&grub_sfs_fs);
+    }
   my_mod = mod;
 }
 
 GRUB_MOD_FINI(sfs)
 {
-  grub_fs_unregister (&grub_sfs_fs);
+  if (!grub_is_lockdown ())
+    grub_fs_unregister (&grub_sfs_fs);
 }

grub-core/fs/udf.c

@@ -27,6 +27,7 @@
 #include <grub/fshelp.h>
 #include <grub/charset.h>
 #include <grub/datetime.h>
+#include <grub/lockdown.h>
 #include <grub/udf.h>
 #include <grub/safemath.h>
 
@@ -1455,12 +1456,16 @@ static struct grub_fs grub_udf_fs = {
 
 GRUB_MOD_INIT (udf)
 {
-  grub_udf_fs.mod = mod;
+  if (!grub_is_lockdown ())
-  grub_fs_register (&grub_udf_fs);
+    {
+      grub_udf_fs.mod = mod;
+      grub_fs_register (&grub_udf_fs);
+    }
   my_mod = mod;
 }
 
 GRUB_MOD_FINI (udf)
 {
-  grub_fs_unregister (&grub_udf_fs);
+  if (!grub_is_lockdown ())
+    grub_fs_unregister (&grub_udf_fs);
 }

grub-core/fs/ufs.c

@@ -25,6 +25,7 @@
 #include <grub/dl.h>
 #include <grub/types.h>
 #include <grub/i18n.h>
+#include <grub/lockdown.h>
 
 GRUB_MOD_LICENSE ("GPLv3+");
 
@@ -899,8 +900,11 @@ GRUB_MOD_INIT(ufs1)
 #endif
 #endif
 {
-  grub_ufs_fs.mod = mod;
+  if (!grub_is_lockdown ())
-  grub_fs_register (&grub_ufs_fs);
+    {
+      grub_ufs_fs.mod = mod;
+      grub_fs_register (&grub_ufs_fs);
+    }
   my_mod = mod;
 }
 
@@ -914,6 +918,7 @@ GRUB_MOD_FINI(ufs1)
 #endif
 #endif
 {
-  grub_fs_unregister (&grub_ufs_fs);
+  if (!grub_is_lockdown ())
+    grub_fs_unregister (&grub_ufs_fs);
 }