Patch "debugfs: Fix lockdown check for mmap_prepare" has been added to the 7.2-stable tree

Patch "debugfs: Fix lockdown check for mmap_prepare" has been added to the 7.2-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    debugfs: Fix lockdown check for mmap_prepare

to the 7.2-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     debugfs-fix-lockdown-check-for-mmap_prepare.patch
and it can be found in the queue-7.2 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


From f81808de37338aac8e167f99bfae647b1b835c70 Mon Sep 17 00:00:00 2001
From: Chun-Yi Lee <jlee@suse.com>
Date: Mon, 15 Jun 2026 18:47:50 +0800
Subject: debugfs: Fix lockdown check for mmap_prepare

From: Chun-Yi Lee <jlee@suse.com>

commit f81808de37338aac8e167f99bfae647b1b835c70 upstream.

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@suse.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Rafael J. Wysocki <rafael@kernel.org>
Cc: Matthew Garrett <mjg59@srcf.ucam.org>
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
Cc: stable@vger.kernel.org
Tested-by: Disha Goel <disgoel@linux.ibm.com>
Reviewed-by: Lorenzo Stoakes <ljs@kernel.org>
Link: https://patch.msgid.link/20260615104750.1000-1-jlee@suse.com
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 fs/debugfs/file.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/fs/debugfs/file.c
+++ b/fs/debugfs/file.c
@@ -273,7 +273,8 @@ static int debugfs_locked_down(struct in
 	    (!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))


Patches currently in stable-queue which might be from jlee@suse.com are

queue-7.2/debugfs-fix-lockdown-check-for-mmap_prepare.patch