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Date: Sun, 4 Dec 2011 22:19:15 +0100
From: Jilles Tjoelker <jilles@stack.nl>
To: Mikolaj Golub <trociny@freebsd.org>
Message-ID: <20111204211915.GA46340@stack.nl>
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Cc: Kostik Belousov <kostikbel@gmail.com>, freebsd-hackers@freebsd.org,
	"Robert N. M. Watson" <rwatson@freebsd.org>
Subject: Re: "ps -e" without procfs(5)
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On Sun, Dec 04, 2011 at 10:58:10PM +0200, Mikolaj Golub wrote:
>  RNMW> Agreed. In general, my view is that p_cansee() should be used for very
>  RNMW> few of our process inspection APIs. I like your example of ASLR
>  RNMW> especially, as it illustrates how debugging information can aid even
>  RNMW> local attacks (i.e., user vs. setuid binary).

> What do you think about recently added kern.proc.ps_strings, which
> returns location of ps_strings structure? It uses p_cansee() too. The
> location is the same for all processes of the same ABI, so this does
> not look like sensitive information, on the other hand it also seems
> to be used by debuggers only.

With stack ASLR, the address will not be the same for every process of
the same ABI and will be sensitive information. Therefore I think this
should be locked down too.

-- 
Jilles Tjoelker