linux-kernel - Re: how to determine if the noexec stack is defined by an application

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Message-ID: <jefy4aflvs.fsf@sykes.suse.de>
Date:	Sat, 30 Jun 2007 00:15:19 +0200
From:	Andreas Schwab <schwab@...e.de>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: how to determine if the noexec stack is defined by an application

Arjan van de Ven <arjan@...radead.org> writes:

> like this:
>
> $ eu-readelf -l /bin/true  | grep STACK
>   GNU_STACK      0x000000 0x00000000 0x00000000 0x000000 0x000000 RW 0x4
>
>
> (replace /bin/true with the binary or library you want to check)
>
> if it says "RW" like here, it'll have non-executable stack. If it says
> "RWX" or if this line is absent entirely, the stack will be executable.

The last part is not true.  Some architectures (especially newer ones)
default to non-exec stack.  The absense of a GNU_STACK header represents
the default.

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@...e.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
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