Re: [Xen-devel] [PATCH QEMU for-4.7] main loop: Big hammer to fix logfile disk DoS in Xen setups

[George Dunlap <george.dunlap@xxxxxxxxxx>]

On Thu, May 26, 2016 at 4:21 PM, Wei Liu <wei.liu2@xxxxxxxxxx> wrote:
> From: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
>
> Each time round the main loop, we now fstat stderr.  If it is too big,
> we dup2 /dev/null onto it.  This is not a very pretty patch but it is
> very simple, easy to see that it's correct, and has a low risk of
> collateral damage.
>
> The limit is 1Mby by default but can be adjusted by setting a new
> environment variable.

There is no limit by default; a companion patch for libxl sets this to
1MiB.  This is so that this patch may be applied on a system qemu
which is shared between multiple use cases (including non-Xen cases).

 -George

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