>> ... when I tested it on my 12.04 desktop box, /proc/self/auxv had permissions
>> set to -r-------- (400) with the user and group set t whoever is logged in 
>> at the time.

Well, /proc/self always links to the current process's /proc entry.  It is just 
a short hand
for /proc/PID, where PID is the return from getpid(), or in most shells, the 
value of $$.

So I would have expected any virtualbox process to be able to read its own 
/proc/self/auxv,
as that special file would be owned by itself (and as you noticed, has 
permissions set to
allow the file  owner to read it.)

It remains a mystery to me that a virtualbox process often can't read
this auxv file.

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https://bugs.launchpad.net/bugs/1014487

Title:
  virtualbox: Error opening file for reading

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