This is a note to let you know that I've just added the patch titled
debugfs: Make debugfs_allow RO after init
to the 5.11-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-make-debugfs_allow-ro-after-init.patch
and it can be found in the queue-5.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 312723a0b34d6d110aa4427a982536bb36ab8471 Mon Sep 17 00:00:00 2001
From: Kees Cook <keescook@xxxxxxxxxxxx>
Date: Mon, 5 Apr 2021 14:39:59 -0700
Subject: debugfs: Make debugfs_allow RO after init
From: Kees Cook <keescook@xxxxxxxxxxxx>
commit 312723a0b34d6d110aa4427a982536bb36ab8471 upstream.
Since debugfs_allow is only set at boot time during __init, make it
read-only after being set.
Fixes: a24c6f7bc923 ("debugfs: Add access restriction option")
Cc: Peter Enderborg <peter.enderborg@xxxxxxxx>
Reviewed-by: Peter Enderborg <peter.enderborg@xxxxxxxx>
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20210405213959.3079432-1-keescook@xxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/debugfs/inode.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/debugfs/inode.c
+++ b/fs/debugfs/inode.c
@@ -35,7 +35,7 @@
static struct vfsmount *debugfs_mount;
static int debugfs_mount_count;
static bool debugfs_registered;
-static unsigned int debugfs_allow = DEFAULT_DEBUGFS_ALLOW_BITS;
+static unsigned int debugfs_allow __ro_after_init = DEFAULT_DEBUGFS_ALLOW_BITS;
/*
* Don't allow access attributes to be changed whilst the kernel is locked down
Patches currently in stable-queue which might be from keescook@xxxxxxxxxxxx are
queue-5.11/sctp-fix-out-of-bounds-warning-in-sctp_process_ascon.patch
queue-5.11/wl3501_cs-fix-out-of-bounds-warnings-in-wl3501_send_.patch
queue-5.11/wl3501_cs-fix-out-of-bounds-warnings-in-wl3501_mgmt_.patch
queue-5.11/drm-radeon-fix-off-by-one-power_state-index-heap-ove.patch
queue-5.11/debugfs-make-debugfs_allow-ro-after-init.patch
queue-5.11/drm-radeon-avoid-power-table-parsing-memory-leaks.patch
