Subject: Re: [PATCH]: non-readable binaries - binfmt_misc 2.6.0-test4
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Herbert Poetzl <herbert@13thfloor.at>
Cc: "Zach, Yoav" <yoav.zach@intel.com>, akpm@osdl.org, torvalds@osdl.org,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
In-Reply-To: <20030831221230.GA9725@DUK2.13thfloor.at>
References: <2C83850C013A2540861D03054B478C0601CF64C8@hasmsx403.iil.intel.com>
	 <20030831221230.GA9725@DUK2.13thfloor.at>
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Date: Sun, 31 Aug 2003 23:48:19 +0100
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On Sul, 2003-08-31 at 23:12, Herbert Poetzl wrote:
> what non-readable files need to be interpreted/executed?
> why is this case relevant?
> why not simply make it user-land readable?

If you are running binaries for another architecture via software
emulation (for example qemu running x86 binaries on your S/390 
transparently) then you want exec only binaries to work with an
otherwise trusted interpreter [Getting the interpreter trust stuff
right is really hard btw - so ironically it probably has to be setuid
anyway so you can't steal the handle]


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