Re: [Qemu-devel] [PATCH] util: secure memfd_create fallback mechanism

[Rafael David Tinoco]

Hello!

> On Sep 27, 2016, at 08:13, Marc-André Lureau <address@hidden> wrote:
> 
>> Note that the filename, per se, is not as important as other files,
>> since qemu won't provide it for being accessed by external programs, and,
>> deletes the file, while keeping the descriptor, right after its creation
>> (due to its nature, that is probably why it was created in /tmp).
>> 
>> Having libvirt to define a filename that would not be used for recent
>> kernels (> 3.17) and would exist for a fraction of second doesn't seem
>> right to me.
>> 
> 
> There are other parts of qemu that rely on creating temporary files, and this 
> seems to lack a bit of uniformity. Would it make sense to define a place 
> where qemu could create those? Or setting TMPDIR should help too. Could 
> libvirt set a per-vm TMPDIR with appropriate security rules?

You got a point. With a per-vm TMPDIR we don't have to care about filenames in 
future for the security driver, while still securing them per-instance base. 
I'll come back to you! 

Thank you!