amd64/163710: setjump in userboot.so causes stack corruption
peter at wemm.org
Sat Dec 31 03:20:10 UTC 2011
The following reply was made to PR amd64/163710; it has been noted by GNATS.
From: Peter Wemm <peter at wemm.org>
To: Russell Cattelan <cattelan at thebarn.com>
Cc: freebsd-gnats-submit at freebsd.org
Subject: Re: amd64/163710: setjump in userboot.so causes stack corruption
Date: Fri, 30 Dec 2011 19:16:10 -0800
On Fri, Dec 30, 2011 at 12:24 PM, Russell Cattelan <cattelan at thebarn.com> w=
> On 12/30/11 1:33 AM, Peter Wemm wrote:
>> On Thu, Dec 29, 2011 at 7:16 PM, Russell Cattelan
>> <cattelan at digitalelves.com> wrote:
>>> For some reason the forth interpreter is built and linked as 32bit even
>>> on amd64.
>> That's the catch. We use the same 32 bit loader on i386 and amd64.
>> The common loader understands both kernel formats. =A0This unfortunately
>> has meant that the libstand and sys/boot environment has had to be 32
> Yes this is bit of an odd situation.
> the loader is linked 32bit but userboot.so / libstand is built 64bit
> but pulls in the 32bit ficl lib.
> The 64bit libstand provides the setjmp call that needs 96 bytes
> of space but since ficl is built with the 32bit jump_buf (48 byte )
> things go sideways.
We link the loader with the 32 bit libstand though. It cannot work
any other way. BTX is 32 bit only.
Peter Wemm - peter at wemm.org; peter at FreeBSD.org; peter at yahoo-inc.com; KI6FJV
"All of this is for nothing if we don't go to the stars" - JMS/B5
"If Java had true garbage collection, most programs would delete
themselves upon execution." -- Robert Sewell
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