linux-kernel - Re: [patch] remove MNT_NOEXEC check for PROT

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Message-ID: <eg197v$e0c$1@taverner.cs.berkeley.edu>
Date:	Wed, 4 Oct 2006 21:31:43 +0000 (UTC)
From:	daw@...berkeley.edu (David Wagner)
To:	linux-kernel@...r.kernel.org
Subject: Re: [patch] remove MNT_NOEXEC check for PROT_EXEC mmaps

Stas Sergeev  wrote:
>The primary goal is to make access() to respect the "noexec".

Unfortunately, access() is insecure by design -- it is inherently
susceptible to race conditions (TOCTTOU attacks).  Therefore, I don't
think it is useful for enforcing security restrictions (such as
enforcing noexec in ld.so).
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