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Sender: julliard@lrcsuns.epfl.ch In-reply-to: sastdr@torpid.unx.sas.com's message of Fri, 1 Nov 1996 20:23:50 GMT Newsgroups: comp.emulators.ms-windows.wine,comp.unix.bsd.freebsd.misc Subject: Re: Wine960928 crashed FreeBSD 2.1.5 References: <32762988.167EB0E7@watermarkgroup.com> <slrn57ghru.7i.hanspbie@zerium.idgonline.no> <E07Knq.7A9@unx.sas.com> From: julliard@lrcsuns.epfl.ch (Alexandre Julliard) Date: 05 Nov 1996 13:50:33 +0100 Message-ID: <1sohhcg0yu.fsf@lrcsuns.epfl.ch> Organization: Wine Makers Inc. Lines: 25 X-Newsreader: Gnus v5.1 NNTP-Posting-Host: lrcsuns.epfl.ch Path: euryale.cc.adfa.oz.au!newshost.carno.net.au!harbinger.cc.monash.edu.au!munnari.OZ.AU!news.ecn.uoknor.edu!feed1.news.erols.com!howland.erols.net!math.ohio-state.edu!jussieu.fr!univ-angers.fr!ciril.fr!cnusc.fr!univ-lyon1.fr!in2p3.fr!swidir.switch.ch!epflnews.epfl.ch!lrcsuns.epfl.ch Xref: euryale.cc.adfa.oz.au comp.emulators.ms-windows.wine:5898 comp.unix.bsd.freebsd.misc:30660 In article <E07Knq.7A9@unx.sas.com> sastdr@torpid.unx.sas.com (Thomas David Rivers) writes: > Ah... but remember to run Wine the operating system has to "hand over" > the LDT to a user-mode program (essentially throwing out the baby > with the bath water.) Unlike under Windows, with a real operating system a user-mode program doesn't have access to the real LDT. It can only request modifications to the LDT via a system call, so that the kernel can make sure that unsafe changes, like creating ring 0 selectors, are forbidden. > On most systems, this type of operation isn't something that is > normally done, much less done on purpose. > > Wine, for instance, could accidently create LDTs that would totally > scramble things and begin writing all over real memory - crashing whatever > operating system lie beneath it. Absolutely not. Unless there is a bug in the kernel, a user-mode program cannot get access via the LDT to anything it doesn't have access to via normal pointers. -- Alexandre Julliard julliard@lrc.epfl.ch