any reason drmDropMaster() has to be root?
llyzs.vic at gmail.com
Tue Apr 10 20:15:50 PDT 2012
I am referring to this line in drm_drv.c in drm module:
DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_ROOT_ONLY)
I can understand that set_master requires root, but if the process is
already master and just want to drop itself from master, I don't see any
point why this has to be root. Could anyone clarify this? If not, I
suggest to change drop_master to DRM_AUTH only.
My use case is like this: I have an application which will start before
X starts, and this app will internally call drmOpen(). Since it's the
first app to open the gpu it automatically becomes master, but then X
won't start afterwards because X requires master for KMS to work. So in
the application I must call drmDropMaster() after drmOpen(), but then I
have to run the application as root just in order to drop master.
Thanks in advanced.
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