From: Andi Kleen <ak@muc.de>
To: Wichert Akkerman <wichert@soil.nl>
Cc: Andi Kleen <ak@muc.de>, linux-mm@kvack.org, riel@conectiva.com.br
Subject: Re: Running out of memory in 1 easy step
Date: Thu, 14 Sep 2000 20:43:25 +0200 [thread overview]
Message-ID: <20000914204325.A6015@fred.muc.de> (raw)
In-Reply-To: <20000914180825.B19822@liacs.nl>; from wichert@soil.nl on Thu, Sep 14, 2000 at 06:08:28PM +0200
On Thu, Sep 14, 2000 at 06:08:28PM +0200, Wichert Akkerman wrote:
> Previously Andi Kleen wrote:
> > There is a hardwired limit of 1024 vmas/process. This is to avoid denial
> > of service attacks with attackers using up all memory with vmas.
>
> That's trivial to circumvent using multiple processes or even threads which
> makes it a useless and possibly damaging protection imho..
The limit is actually 65536 I misremembered it.
The main purpose is probably to avoid the counter wrapping.
When get_unmapped_area failed you likely just ran out of virtual address space.
-Andi
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next prev parent reply other threads:[~2000-09-14 18:43 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-09-14 12:59 Wichert Akkerman
2000-09-14 15:56 ` Andi Kleen
2000-09-14 16:08 ` Wichert Akkerman
2000-09-14 18:43 ` Andi Kleen [this message]
2000-09-14 19:20 ` Wichert Akkerman
2000-09-14 23:03 ` Mark Hahn
2000-09-15 13:22 Mark_H_Johnson
2000-09-15 16:35 ` Mark Hahn
2000-09-15 16:53 Mark_H_Johnson
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