Date: Thu, 29 Dec 2011 10:44:01 -0800 From: Xin Li <delphij@delphij.net> To: John Baldwin <jhb@freebsd.org> Cc: freebsd-security@freebsd.org, Doug Barton <dougb@freebsd.org>, d@delphij.net 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... Message-ID: <4EFCB4F1.2050500@delphij.net> In-Reply-To: <201112291343.02248.jhb@freebsd.org> References: <201112231500.pBNF0c0O071712@svn.freebsd.org> <201112290939.53665.jhb@freebsd.org> <4EFCB0C9.6090608@delphij.net> <201112291343.02248.jhb@freebsd.org>
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 12/29/11 10:43, John Baldwin wrote: > 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? Oh ok, that was the built-in ls(1). Cheers, - -- Xin LI <delphij@delphij.net> https://www.delphij.net/ FreeBSD - The Power to Serve! Live free or die -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.18 (FreeBSD) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAk78tPEACgkQOfuToMruuMBq7QCfe2mWQDanxhZDDODYCo4Wqets +VMAn3kfObewKpZReZIucOIQIuj+OnWS =8h/i -----END PGP SIGNATURE-----
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