Re: [Patch2] Re: DoS with tmpfs #3

Helge Hafting (helgehaf@idb.hist.no)
Thu, 09 Aug 2001 08:29:56 +0200


Ivan Kalvatchev wrote:

> I didn't look at the chages but i will say this one
> more time. Limiting tmpfs size at fixed amount of
> space will make the bug harder to reproduce but won't
> fix it. The right hack is to limit tmpfs to be with
> freepages.high less than available memory(swap+ram).
> It won't be hard to code.

The problem with this is that tmpfs may be mounted before
swap is initialized, so a little less than
swap+ram will become "a little less than just RAM" anyway.

Or do you propose a dynamic limit, changing as swap
is added/removed? This has problems if some swap is
removed, and suddenly tmpfs usage exceeds its quota.

Helge Hafting
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