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

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Date:	Sun, 24 Sep 2006 21:12:28 -0400
From:	Valdis.Kletnieks@...edu
To:	Stas Sergeev <stsp@...et.ru>
Cc:	Ulrich Drepper <drepper@...hat.com>,
	Hugh Dickins <hugh@...itas.com>, Andrew Morton <akpm@...l.org>,
	Linux kernel <linux-kernel@...r.kernel.org>
Subject: Re: [patch] remove MNT_NOEXEC check for PROT_EXEC mmaps

On Sat, 23 Sep 2006 19:47:19 +0400, Stas Sergeev said:
> Hi.
> 
> Ulrich Drepper wrote:
> > Definitely not.  The test should stay.  It does the right thing.  Yes,
> > some applications might break, but this is the fault of the application.
> But why exactly? They do:
> shm_open();
> mmap(PROT_READ|PROT_WRITE|PROT_EXEC);
> and mmap fails.
> Where is the fault of an app here?

'man 2 open' reports the following error code as a possibility:
       EROFS  pathname refers to a file on a read-only filesystem and write
	access was requested.

Are you suggesting that it's not an app's fault/problem if it tries to
open a writable file on a R/O filesystem?  Because it's essentially the
same problem....


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