[Bug 90079] drmSetMaster and drmDropMaster need root privileges

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=90079

            Bug ID: 90079
           Summary: drmSetMaster and drmDropMaster need root privileges
           Product: DRI
           Version: unspecified
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: libdrm
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: g1938560@trbvm.com

I run a small, user-space program that renders images in my virtual console
with drmModeSetCRTC and family. I also support virtual terminal switching with
ioctl() on stuff from linux/vt.h and some basic signal handling.

Switching back to X server, however, just renders... nothing.

Apparently I'm supposed to call drmDropMaster so that X server can pick up from
there. I get -1 and errno is set to Permission Denied. When run as root, it
works as expected.

Is there any reason why these functions require root privileges?
More importantly, is there any workaround for this so that my user space
program can let X server draw its stuff once user switches back to X's virtual
terminal?

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