Re: Segfault on the i386 enter instruction

[Andi Kleen]

On Mon, May 15, 2006 at 09:15:31PM +0400, Stas Sergeev wrote:
> Hi.
> 
> Andi Kleen wrote:
> >>Aren't the rlimit and the other checks of acct_stack_growth()
> >>not enough, or am I missing something obvious?
> >Traditionally Linux doesn't have a stack ulimit.
> That clarifies the roots of this %esp check, as without
> the stack ulimit and without the proper memory accounting
> (the case of 2.4?) such a check is the "last hope" - I've
> got the point. But are there the reasons to still keep it
> in 2.6, considering also the false-positives? It seems to
> have the STACK_RLIMIT and it seems to get the memory accounting
> right, and not too many arches seem to have such a check even.

Linux doesn't have a STACK_RLIMIT by default no.
It is set by a few distributions (for use with flexmmap) in PAM, but
not by all. The kernel defaults don't have it.

-Andi
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