Date: Sat, 24 Dec 2011 14:57:18 +0400 From: Andrey Chernov <ache@FreeBSD.ORG> To: Xin LI <delphij@gmail.com>, Kostik Belousov <kostikbel@gmail.com>, Alexander Kabaev <kabaev@gmail.com>, John Baldwin <jhb@FreeBSD.ORG>, Colin Percival <cperciva@FreeBSD.ORG>, src-committers@FreeBSD.ORG, svn-src-all@FreeBSD.ORG, svn-src-head@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... Message-ID: <20111224105717.GA11193@vniz.net> In-Reply-To: <20111224105045.GA11127@vniz.net> References: <201112231500.pBNF0c0O071712@svn.freebsd.org> <201112231058.46642.jhb@freebsd.org> <201112231122.34436.jhb@freebsd.org> <20111223120644.75fe944d@kan.dyndns.org> <20111223175143.GJ50300@deviant.kiev.zoral.com.ua> <20111224100509.GA98136@vniz.net> <CAGMYy3s4YM-j165o9p%2BEDgMf0%2BaJq7gKj5yR=LK8_yfECnbtog@mail.gmail.com> <20111224103948.GA10939@vniz.net> <CAGMYy3vUMUi0ajADs2AdVRPfWQShmjfXDHfrKTFBmHGiNTWPFA@mail.gmail.com> <20111224105045.GA11127@vniz.net>
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On Sat, Dec 24, 2011 at 02:50:45PM +0400, Andrey Chernov wrote: > 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. To work in admin-think-safe environment we can add another syscall like safe_chroot(1). When it is marked as safe, ischroot() will return 0. -- http://ache.vniz.net/
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