On 11/10/2013 06:13 PM, Dave Young wrote: > > Huang Ying <ying.huang at intel.com> created the debugfs file for boot_params. > His first version patch tried sysfs, but sysfs is not designed for such > binary blobs so finally it go to debugfs. > That is a misunderstanding. Binary blobs can exist in sysfs as long as the blob is something that is inherently a blob. This is admittedly a corner case, but it is without any doubt a protocol-defined binary structure. The reason it was put in debugfs is that there was no non-debug user for it at the time. > Any idea for this is welcome, till now I have no better idea for such kind > of data. We should have another *fs instead of using debugfs. The problem with debugfs is that things go into debugfs with largely no auditing. As a result, mounting debugfs is very likely to mean that your system is exploitable one way or another. -hpa
