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 5.12-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-5.12 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-5.12/sctp-fix-out-of-bounds-warning-in-sctp_process_ascon.patch queue-5.12/wl3501_cs-fix-out-of-bounds-warnings-in-wl3501_send_.patch queue-5.12/wl3501_cs-fix-out-of-bounds-warnings-in-wl3501_mgmt_.patch queue-5.12/drm-radeon-fix-off-by-one-power_state-index-heap-ove.patch queue-5.12/debugfs-make-debugfs_allow-ro-after-init.patch queue-5.12/drm-radeon-avoid-power-table-parsing-memory-leaks.patch