linux-kernel - Re: [PATCH] afs: proc cells and rootcell are writeable

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Message-ID: <20140126202257.GA10256@gmail.com>
Date:	Sun, 26 Jan 2014 21:22:57 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	David Howells <dhowells@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-afs@...ts.infradead.org,
	Pali Rohár <pali.rohar@...il.com>
Subject: Re: [PATCH] afs: proc cells and rootcell are writeable


* Ingo Molnar <mingo@...nel.org> wrote:

> Perhaps we could also generate the most common variants as:
> 
>  #define PERM__rw_r__r__		0644
>  #define PERM__r________		0400
>  #define PERM__r__r__r__		0444
>  #define PERM__r_xr_xr_x		0555
> 
> etc.
> 
> or something similar, more or less matching the output of 'ls -l'?
> 
> That would also make security bugs in this area apparent at first 
> sight. The number of people who can recognize during review that 
> PERM_rw__w__w is probably unwise is probably two orders of magnitude 
> than those who can interpret octal 0622 at a glance.
 ^--higher

Thanks,

	Ingo
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