[PATCH 2/2] nfs: create a kernel keyring

[Christoph Hellwig <hch@xxxxxx>]

Create a kernel .nfs keyring similar to the nvme .nvme one.  Unlike for
a userspace-created keyrind, tlshd is a possesor of the keys with this
and thus the keys don't need user read permissions.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
 fs/nfs/inode.c | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 119e447758b9..e7a519f5b6bc 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -2571,6 +2571,35 @@ static struct pernet_operations nfs_net_ops = {
 	.size = sizeof(struct nfs_net),
 };
 
+#ifdef CONFIG_KEYS
+static struct key *nfs_keyring;
+
+static int __init nfs_init_keyring(void)
+{
+	nfs_keyring = keyring_alloc(".nfs",
+			     GLOBAL_ROOT_UID, GLOBAL_ROOT_GID,
+			     current_cred(),
+			     (KEY_POS_ALL & ~KEY_POS_SETATTR) |
+			     (KEY_USR_ALL & ~KEY_USR_SETATTR),
+			     KEY_ALLOC_NOT_IN_QUOTA, NULL, NULL);
+	return PTR_ERR_OR_ZERO(nfs_keyring);
+}
+
+static void __exit nfs_exit_keyring(void)
+{
+	key_put(nfs_keyring);
+}
+#else
+static inline int nfs_init_keyring(void)
+{
+	return 0;
+}
+
+static inline void nfs_exit_keyring(void)
+{
+}
+#endif /* CONFIG_KEYS */
+
 /*
  * Initialize NFS
  */
@@ -2578,6 +2607,10 @@ static int __init init_nfs_fs(void)
 {
 	int err;
 
+	err = nfs_init_keyring();
+	if (err)
+		return err;
+
 	err = nfs_sysfs_init();
 	if (err < 0)
 		goto out10;
@@ -2638,6 +2671,7 @@ static int __init init_nfs_fs(void)
 out9:
 	nfs_sysfs_exit();
 out10:
+	nfs_exit_keyring();
 	return err;
 }
 
@@ -2653,6 +2687,7 @@ static void __exit exit_nfs_fs(void)
 	nfs_fs_proc_exit();
 	nfsiod_stop();
 	nfs_sysfs_exit();
+	nfs_exit_keyring();
 }
 
 /* Not quite true; I just maintain it */
-- 
2.47.2