Re: [announce] [patch] NX (No eXecute) support for x86, 2.6.7-rc2-bk2

[Arjan van de Ven]

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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