[v2,1/5] efi: vars: prohibit reading random seed variables
Commit Message
In anticipation of putting random seeds in EFI variables, it's important
that the random GUID namespace of variables remains hidden from
userspace. We accomplish this by not populating efivarfs with entries
from that GUID, as well as denying the creation of new ones in that
GUID.
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
---
fs/efivarfs/inode.c | 4 ++++
fs/efivarfs/super.c | 3 +++
2 files changed, 7 insertions(+)
@@ -91,6 +91,10 @@ static int efivarfs_create(struct user_namespace *mnt_userns, struct inode *dir,
err = guid_parse(dentry->d_name.name + namelen + 1, &var->var.VendorGuid);
if (err)
goto out;
+ if (guid_equal(&var->var.VendorGuid, &LINUX_EFI_RANDOM_SEED_TABLE_GUID)) {
+ err = -EPERM;
+ goto out;
+ }
if (efivar_variable_is_removable(var->var.VendorGuid,
dentry->d_name.name, namelen))
@@ -116,6 +116,9 @@ static int efivarfs_callback(efi_char16_t *name16, efi_guid_t vendor,
int err = -ENOMEM;
bool is_removable = false;
+ if (guid_equal(&vendor, &LINUX_EFI_RANDOM_SEED_TABLE_GUID))
+ return 0;
+
entry = kzalloc(sizeof(*entry), GFP_KERNEL);
if (!entry)
return err;