Date: Sun, 2 Dec 2001 06:59:23 -0600 (CST) From: hawkeyd@visi.com (D J Hawkey Jr) To: jhb@FreeBSD.ORG, security@FreeBSD.ORG Subject: Re: options USER_LDT Message-ID: <200112021259.fB2CxNh62460@sheol.localdomain> In-Reply-To: <XFMail.011201170928.jhb_FreeBSD.org@ns.sol.net> References: <20011202120451.R6917-100000_gamplex.bde.org@ns.sol.net> <XFMail.011201170928.jhb_FreeBSD.org@ns.sol.net>
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In article <XFMail.011201170928.jhb_FreeBSD.org@ns.sol.net>, jhb@FreeBSD.ORG writes: > > On 02-Dec-01 Bruce Evans wrote: >> On Sat, 1 Dec 2001, John Baldwin wrote: >> >>> On 01-Dec-01 Dave wrote: >>> > >>> > I really have no clue what the kernel option: >>> > options USER_LDT >>> > >>> > means, except this rugged definition I found in LINT (paraphrase): >>> > "Allow applications running in user space to manipulate the Local >>> > Descriptor Table (LDT)" >>> > >>> > Since it didn't come in the GENERIC (FBSD 4.4 REL), I'm assuming that >>> > someone, somewhere, thought it would be a good idea to have this disabled >>> > by default and maybe it was meant to be added in only by people who know >>> > what they are doing. >>> >>> No, it's enabled by default, not disabled by default. >> >> Er, not in RELENG_4. It can only be enabled by default if it doesn't exist, >> as in -current :-). > > Ah, nm, I misread it thinking that the option was gone from 4.4 completely. To > answer the original question then: it's not enabled by default most likely > because when it was added as a new feature it was left as an option that was > off by default so that any bugs it might have wouldn't bite people he didn't > need it. Um, guys? I think your language is becoming too tortured. Does USER_LDT still exist as a kernel option, and is it still doc'd in LINT? Does it pose a security risk in the more current releases? And is it enabled now by default, or simply depreciated, and no longer a possible "gotcha" in running Wine or mplayer? >> Bruce Dave -- Windows: "Where do you want to go today?" Linux: "Where do you want to go tomorrow?" FreeBSD: "Are you guys coming, or what?" To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message
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