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

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Message-ID: <ef9d6m$chs$1@taverner.cs.berkeley.edu>
Date:	Mon, 25 Sep 2006 20:12:06 +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

Arjan van de Ven  wrote:
>[...]  so you remove a security check ... [...]
>
>If you can mmap PROT_EXEC the "noexec" mount option doesn't mean
>anything! Because a elf binary loader is easily written in
>perl/shell/whatever, the kernel "x" bit is just a convenience there!
>The PROT_EXEC check at least makes it a bit harder to do anything like
>this; not impossible obviously

The last sentence of your post implies that this never was a security
check.  (I'll believe it was a check to prevent some kinds of accidental
misbehavior, but I don't believe it prevents deliberate misbehavior.)
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