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Date: Fri, 4 Jun 2004 20:12:41 +0200
From: Arjan van de Ven <arjanv@redhat.com>
To: Gerhard Mack <gmack@innerfire.net>
Cc: Linus Torvalds <torvalds@osdl.org>, Andy Lutomirski <luto@myrealbox.com>,
       Ingo Molnar <mingo@elte.hu>, Andi Kleen <ak@suse.de>,
       Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Andrew Morton <akpm@osdl.org>, suresh.b.siddha@intel.com,
       jun.nakajima@intel.com
Subject: Re: [announce] [patch] NX (No eXecute) support for x86,   2.6.7-rc2-bk2
Message-ID: <20040604181241.GB407@devserv.devel.redhat.com>
References: <20040602205025.GA21555@elte.hu> <20040603230834.GF868@wotan.suse.de> <20040604092552.GA11034@elte.hu> <200406040826.15427.luto@myrealbox.com> <Pine.LNX.4.58.0406040830200.7010@ppc970.osdl.org> <20040604154142.GF16897@devserv.devel.redhat.com> <Pine.LNX.4.58.0406040843240.7010@ppc970.osdl.org> <20040604155138.GG16897@devserv.devel.redhat.com> <Pine.LNX.4.58.0406041408220.31276@innerfire.net>
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On Fri, Jun 04, 2004 at 02:11:00PM -0400, Gerhard Mack wrote:
> On Fri, 4 Jun 2004, Arjan van de Ven wrote:
> 
> > I know that in a FC1 full install there are less than 5 binaries that don't
> > run with NX. (one uses nested functions in C and passes function pointers to
> > the inner function around which causes gcc to emit a stack trampoline, and
> > gcc then marks the binary as non-NX, the others have asm in them that we
> > didn't fix in time to be properly marked).
> 
> Can you tell if GCC uses trampolines for all use of function pointers or
> just ones that use nested functions ?

just for nested functions

> 
> Also, what is the fastest way to check if GCC is marking non-NX?

readelf -l <binary>

should give output with a STACK line, if that says "RW" then it's NX ok, if
it says "RWX" then it's non-NX


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