Commit 312723a0 authored by Kees Cook's avatar Kees Cook Committed by Greg Kroah-Hartman
Browse files

debugfs: Make debugfs_allow RO after init 



Since debugfs_allow is only set at boot time during __init, make it
read-only after being set.

Fixes: a24c6f7b ("debugfs: Add access restriction option")
Cc: Peter Enderborg <peter.enderborg@sony.com>
Reviewed-by: default avatarPeter Enderborg <peter.enderborg@sony.com>
Signed-off-by: default avatarKees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20210405213959.3079432-1-keescook@chromium.org


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent c2f3f755

fs/debugfs/inode.c

+1 −1
Original line number Diff line number Diff line
@@ -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