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Date: Sat, 24 Dec 2011 14:50:45 +0400
From: Andrey Chernov <ache@FreeBSD.ORG>
To: Xin LI <delphij@gmail.com>
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Cc: src-committers@FreeBSD.ORG, John Baldwin <jhb@FreeBSD.ORG>,
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Subject: Re: svn commit: r228843 - head/contrib/telnet/libtelnet
 head/crypto/heimdal/appl/telnet/libtelnet head/include head/lib/libc/gen
 head/lib/libc/iconv head/lib/libc/include head/lib/libc/net head/libexec...
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On Sat, Dec 24, 2011 at 02:45:21AM -0800, Xin LI wrote:
> On Sat, Dec 24, 2011 at 2:39 AM, Andrey Chernov <ache@freebsd.org> wrote:
> > On Sat, Dec 24, 2011 at 02:26:20AM -0800, Xin LI wrote:
> >> chroot(2) can create legitimate and secure environment where dlopen(2)
> >> is safe and necessary.
> >
> > Yes, so ischroot() check can be used only into that places where libc's
> > libc_dlopen() currently used, i.e. placed into libc_dlopen() itself.
> 
> So it's Okay to break NSS in chroot jail?

We need general solution. We simple can't count all possible and future 
ftpd's arround the world and insert __FreeBSD_libc_enter_restricted_mode() 
into them. I even not mention other programs that may use chroot() too. If 
some component like auth is critical for chroot, it should be restricted 
in general scope.

-- 
http://ache.vniz.net/