From: Kees Cook <keescook@chromium.org>
Date: Mon, 5 Apr 2021 21:39:59 +0000 (-0700)
Subject: debugfs: Make debugfs_allow RO after init
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=312723a0b34d6d110aa4427a982536bb36ab8471;p=linux.git

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: a24c6f7bc923 ("debugfs: Add access restriction option")
Cc: Peter Enderborg <peter.enderborg@sony.com>
Reviewed-by: Peter Enderborg <peter.enderborg@sony.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20210405213959.3079432-1-keescook@chromium.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c
index 22e86ae4dd5a8..1d252164d97b6 100644
--- 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