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From: John Baldwin <jhb@freebsd.org>
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	(bigwig.baldwin.cx); Thu, 29 Dec 2011 13:43:04 -0500 (EST)
Cc: freebsd-security@freebsd.org, Doug Barton <dougb@freebsd.org>
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 Thursday, December 29, 2011 1:26:17 pm Xin Li wrote:
> On 12/29/11 06:39, John Baldwin wrote:
> > Can you give some more details on why ftpd is triggering a dlopen
> > inside of the chroot?  It would appear that that is unrelated to
> > helper programs (since setting a flag in libc in ftpd can't
> > possibly affect helper programs ability to use dlopen() from within
> > libc).
> 
> Sure.  That's because nsdispatch(3) would reload /etc/nsswitch.conf if
> it notices a change.  After chroot() the file is considered as
> "chang"ed and thus it reloads the file as well as designated shared
> libraries.

But ftpd has to be doing some operation that invokes an nss lookup after
entering the chroot for that to trigger, correct?

-- 
John Baldwin