On Fri, Apr 27, 2018 at 3:49 PM, Greg KH <gre...@linuxfoundation.org> wrote: > I'm going to add Kees and the kernel-hardning list here, as I'd like > their opinions for the patch below. > > Kees, do you have any problems with this patch? I know you worked on > making debugfs more "secure" from non-root users, this should still keep > the intial mount permissions all fine, right? Anything I'm not > considering here? > > thanks, > > greg k-h > > On Fri, Apr 27, 2018 at 02:35:47PM +0200, Thomas Richter wrote: >> Currently function debugfs_create_dir() creates a new >> directory in the debugfs (usually mounted /sys/kernel/debug) >> with permission rwxr-xr-x. This is hard coded. >> >> Change this to use the parent directory permission.
AFAICS no inodes in debugfs have handlers for the ->rename, ->mkdir, ->create inode ops. What is write permission on debugfs directories useful for?
