[PATCH v2] debugfs: Fix lockdown check for mmap_prepare

[Chun-Yi Lee]

From: Chun-Yi Lee <jlee@xxxxxxxx>

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`.

Since the conversion to `mmap_prepare` across the kernel is not yet
complete, update the lockdown check to look for both `mmap` and
`mmap_prepare` to ensure comprehensive coverage.

Fixes: 651fdda8406d ("relay: update relay to use mmap_prepare")
Signed-off-by: Chun-Yi Lee <jlee@xxxxxxxx>
Cc: David Howells <dhowells@xxxxxxxxxx>
Cc: Lorenzo Stoakes <ljs@xxxxxxxxxx>
Cc: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Rafael J. Wysocki <rafael@xxxxxxxxxx>
Cc: Matthew Garrett <mjg59@xxxxxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Danilo Krummrich <dakr@xxxxxxxxxx>
Cc: driver-core@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: stable@xxxxxxxxxxxxxxx
---
v2:
- Add explicit From tag to match Signed-off-by.
- Fix Lorenzo's email address.
- Add Cc stable for backporting.
- Check both mmap and mmap_prepare as suggested by Lorenzo.

 fs/debugfs/file.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/debugfs/file.c b/fs/debugfs/file.c
index edd6aafbfbaa..08de6652a4f3 100644
--- a/fs/debugfs/file.c
+++ b/fs/debugfs/file.c
@@ -273,7 +273,8 @@ static int debugfs_locked_down(struct inode *inode,
 	    (!real_fops ||
 	     (!real_fops->unlocked_ioctl &&
 	      !real_fops->compat_ioctl &&
-	      !real_fops->mmap)))
+	      !real_fops->mmap &&
+	      !real_fops->mmap_prepare)))
 		return 0;
 
 	if (security_locked_down(LOCKDOWN_DEBUGFS))
-- 
2.43.0