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Message-ID: <00c001cfb0f1$3c88a9f0$b599fdd0$@codeaurora.org>
Date: Tue, 5 Aug 2014 14:07:16 -0700
From: "Weiming Zhao" <weimingz@...eaurora.org>
To: <musl@...ts.openwall.com>
Subject: RE: How to setup pre-allocated heap stack space?
Yes, I will check the limit of the heap. Just want to check with you if the
basic idea is correct.
Thanks a lot!
-----Original Message-----
From: Rich Felker [mailto:dalias@...ifal.cx] On Behalf Of Rich Felker
Sent: Tuesday, August 05, 2014 2:05 PM
To: musl@...ts.openwall.com
Subject: Re: [musl] How to setup pre-allocated heap stack space?
On Tue, Aug 05, 2014 at 01:59:21PM -0700, Weiming Zhao wrote:
> Hi Rich,
>
> I'm using it on a bare-metal setup. So the heap space some fixed address.
> So I think I should modify __brk() like:
> uintptr_t __brk(uintptr_t newbrk) {
> return newbrk == 0 ? HEAP_BASE : newbrk ; // assume heap is large
> enough } Is that correct? I don't need to worry about free(), right?
Well I would at least make sure you don't overflow into other memory, by
checking against an upper bound for the heap. But yes, something like the
above looks right.
Rich
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