[PATCH] debugfs: Fix lockdown check for mmap_prepare

[Chun-Yi Lee <joeyli.kernel@gmail.com>]

Commit 651fdda8406d ("relay: update relay to use mmap_prepare")
changed the `mmap` file operation to `mmap_prepare` for relayfs, but
the lockdown check in debugfs was not updated accordingly.

This prevents debugfs from being locked down when the kernel is in
integrity mode if a file uses `mmap_prepare` but not `mmap`.

Update the lockdown check to look for `mmap_prepare` instead of `mmap`
to fix this.

Fixes: 651fdda8406d ("relay: update relay to use mmap_prepare")
Signed-off-by: Chun-Yi Lee <jlee@suse.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
cc: Andy Shevchenko <andy.shevchenko@gmail.com>
cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Rafael J. Wysocki <rafael@kernel.org>
Cc: Matthew Garrett <matthewgarrett@google.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Danilo Krummrich <dakr@kernel.org>
Cc: driver-core@lists.linux.dev
Cc: linux-kernel@vger.kernel.org
---
 fs/debugfs/file.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/debugfs/file.c b/fs/debugfs/file.c
index edd6aafbfbaa..d5e187895dd8 100644
--- a/fs/debugfs/file.c
+++ b/fs/debugfs/file.c
@@ -273,7 +273,7 @@ static int debugfs_locked_down(struct inode *inode,
 	    (!real_fops ||
 	     (!real_fops->unlocked_ioctl &&
 	      !real_fops->compat_ioctl &&
-	      !real_fops->mmap)))
+	      !real_fops->mmap_prepare)))
 		return 0;
 
 	if (security_locked_down(LOCKDOWN_DEBUGFS))
-- 
2.43.0