linux-kernel - Re: [uClinux-dev] Re: [PATCH] FDPIC: respect PT_GNU_STACK exec markings when creating NOMMU stack

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Date:	Fri, 4 Dec 2009 02:07:08 -0500
From:	Mike Frysinger <vapier@...too.org>
To:	uclinux-dev@...inux.org
Cc:	David Howells <dhowells@...hat.com>, linux-kernel@...r.kernel.org,
	Greg Ungerer <gerg@...inux.org>,
	uclinux-dist-devel@...ckfin.uclinux.org,
	David McCullough <davidm@...pgear.com>
Subject: Re: [uClinux-dev] Re: [PATCH] FDPIC: respect PT_GNU_STACK exec markings when creating NOMMU stack

On Thursday 03 December 2009 12:58:04 David Howells wrote:
> Mike Frysinger <vapier.adi@...il.com> wrote:
> > i have seen a few apps use brk()/sbrk() to query the size of things (like
> > e2fsprogs)
> 
> We do actually record the size of the brk segment, so maybe we could icache
> flush brk as it is increased (if it is increased):
> 
> 	diff --git a/mm/nommu.c b/mm/nommu.c
> 	index 3754b16..2ea823d 100644
> 	--- a/mm/nommu.c
> 	+++ b/mm/nommu.c
> 	@@ -432,6 +432,7 @@ SYSCALL_DEFINE1(brk, unsigned long, brk)
> 		/*
> 		 * Ok, looks good - let it rip.
> 		 */
> 	+	flush_icache_range(mm->brk, brk);
> 		return mm->brk = brk;
> 	 }

probably want mm->brk + brk for the second argument
-mike

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