Re: Fwd: Fwd: X stopped working with 5.14 on iBook

On Wed, 3 Nov 2021, Andreas Schwab wrote:

On Nov 02 2021, Finn Thain wrote:

quoted

After many builds and tests, Stan and I were able to determine that this 
regression only affects builds with CONFIG_USER_NS=y. That is,

d3ccc9781560  + CONFIG_USER_NS=y  -->  fail
d3ccc9781560  + CONFIG_USER_NS=n  -->  okay
d3ccc9781560~ + CONFIG_USER_NS=y  -->  okay
d3ccc9781560~ + CONFIG_USER_NS=n  -->  okay

On my iBook G4, X is working alright with 5.15 and CONFIG_USER_NS=y.

Stan said his Cube has these packages installed:

# dpkg --list | grep Xorg
ii  xserver-xorg-core                      2:1.20.11-1
      powerpc      Xorg X server - core server
ii  xserver-xorg-legacy                    2:1.20.11-1
      powerpc      setuid root Xorg server wrapper

I gather that Riccardo also runs Debian SID.

Perhaps there is some interaction between d3ccc9781560, CONFIG_USER_NS and 
the SUID wrapper...

Does your Xorg installation use --enable-suid-wrapper, Andreas?