Re: [Xen-devel] [PATCH 3/8] xen: defer call to xen_restrict until just before os_setup_post

[Anthony PERARD <anthony.perard@xxxxxxxxxx>]

On Mon, Oct 09, 2017 at 05:01:37PM +0100, Ian Jackson wrote:
> We need to restrict *all* the control fds that qemu opens.  Looking in
> /proc/PID/fd shows there are many; their allocation seems scattered
> throughout Xen support code in qemu.
> 
> We must postpone the restrict call until roughly the same time as qemu
> changes its uid, chroots (if applicable), and so on.
> 
> There doesn't seem to be an appropriate hook already.  The RunState
> change hook fires at different times depending on exactly what mode
> qemu is operating in.
> 
> And it appears that no-one but the Xen code wants a hook at this phase
> of execution.  So, introduce a bare call to a new function
> xen_setup_post, just before os_setup_post.  Also provide the
> appropriate stub for when Xen compilation is disabled.
> 
> We do the restriction before rather than after os_setup_post, because
> xen_restrict may need to open /dev/null, and os_setup_post might have
> called chroot.
> 
> Signed-off-by: Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>

Reviewed-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>

-- 
Anthony PERARD

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