On Fri, Sep 23, 2005 at 05:12:44PM +0200, Surrel Thomas wrote: > Hi, > > I'm writing a driver which registers a number of device attributes in > sysfs. The permissions are set when calling DEVICE_ATTR macro. > My concern is that the users of that driver might be willing to set > different permissions for the device (for security reasons). Some of the > attributes fall under these security reasons and should therefore have > the same permissions as the file in /dev. > Is there a way to do that ? Do what? Have userspace change the permissions and have them stick? Yes, that will work. Or have the kernel change the permissions later on? Yes, we have a function for that, sysfs_chmod_file(). > Is there any other security feature provided by sysfs ? What else do you want? > Am I wrong implementing security sensible calls through sysfs ? I don't understand what you mean by this. > This message contains confidential information and is intended only for the > individual named. Sorry, you just sent this to a publicly archived list, which is not confidential at all... greg k-h -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
