[Bug 71282] New: Cannot authenticate second libva client

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=71282

          Priority: medium
            Bug ID: 71282
          Assignee: dri-devel at lists.freedesktop.org
           Summary: Cannot authenticate second  libva client
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: rekjanov at epiphan.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: General
           Product: DRI

Created attachment 88733
  --> https://bugs.freedesktop.org/attachment.cgi?id=88733&action=edit
Test program

Environment:
* ubuntu 12.04.3 LTS with 3.8 kernel
* No X11, pure DRM
* libva 0.34
* libdrm 2.4.43
* regular user account, no CAP_SYS_ADMIN, but in 'video' group 
* A simple program, which calls vaInitialize and then sleeps for several
seconds.
* Intel video hardware (Ivy Bridge)
Problem:
If another test program instance is started while the first is sleeping, it
fails in va_getDriverName.


Debugging and source review shows that the first instance is authenticated
automatically, because it gets the master. Second instance tries to
authenticate using authmagic, but fails because auth magic ioctl is marked as
DRM_AUTH - so you need to be already authenticated in order to authenticate!

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