linux-kernel - Re: Is PIE randomization breaking klibc binaries?

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Date:	Thu, 2 Aug 2007 22:42:16 +0200
From:	Ulrich Kunitz <kune@...ne-taler.de>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Sergey Vlasov <vsu@...linux.ru>, Chuck Ebbert <cebbert@...hat.com>,
	linux-kernel@...r.kernel.org, honza@...os.cz, jkosina@...e.cz
Subject: Re: Is PIE randomization breaking klibc binaries?

H. Peter Anvin wrote:

> Yup... it should probably be pointed out the reason the old kernel 
> worked was nothing but pure dumb luck.  This was a GNU ld change which 
> needed to be undone for klibc.  It's unfortunate that stock x86-64 
> binaries leave as little of a null pointer range as they do, but that's 
> life, unfortunately.  The other alternative is to map klibc just below 
> the 2 GB point, which would also work, but the old way broke when the ld 
> change went in.  As previously stated, klibc-1.4.35 or higher fixes this.
> 
> 	-hpa

Just for the record: The kernel with the PIE patch boots perfectly
using the klibc 1.5 shared binaries on my machine.

-- 
Uli Kunitz
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