Security issues with abstract namespace sockets

[Daniel J Walsh]

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On 01/05/2011 04:33 PM, Matt McCutchen wrote:
> On Wed, 2011-01-05 at 15:25 -0500, Adam Jackson wrote:
>> On Wed, 2011-01-05 at 13:38 -0500, Matt McCutchen wrote:
>>> The
>>> more significant DoS condition is another user taking the name you want,
>>> which can happen in the abstract namespace but not in a directory only
>>> you can write.
>>
>> I don't have any of those.  If the X server is running as root (like in
>> the gdm case) then I can put the socket wherever I want.  If it's Xvfb,
>> then where do I put this directory?  $HOME ?  Nope, might not be
>> there.  /tmp/$USER ?  Won't work if someone else mkdir'd /tmp/ajax
>> before I did.
> 
> What about the XDG_RUNTIME_DIR (/var/run/user/$USER) from systemd?
> 
This does not exist until after the User has logged in.  X starts before
the user logs in.  Also multiple users need to be able to talk to same
xserver.  Not sure about switchuser.
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