Date: Thu, 25 Dec 1997 22:00:01 -0800 (PST) From: Tim Vanderhoek <ac199@hwcn.org> To: freebsd-bugs Subject: Re: kern/2412 Message-ID: <199712260600.WAA25043@hub.freebsd.org>
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The following reply was made to PR kern/2412; it has been noted by GNATS.
From: Tim Vanderhoek <ac199@hwcn.org>
To: Bruce Evans <bde@zeta.org.au>
Cc: dima@tejblum.dnttm.rssi.ru, hoek@freebsd.org, h-nokubi@nmit.mt.nec.co.jp,
gnats-submit@freebsd.org
Subject: Re: kern/2412
Date: Mon, 25 Nov 1996 23:49:38 -0500 (EST)
On Fri, 26 Dec 1997, Bruce Evans wrote:
> No one specific is responsible, but USER_LDT is obviously quite
> broken without the option being visible. fork(), exec() and exit()
Okay, but I'm not about to enable untested code in machdep.c or
vm_machdep.c, so I'll change the synopsis to reflect the problem,
and add this message and one of Dima's to the audit-trail.
I'll also note that the originator reports that the original
problem ("wine does not run") can be worked-around by using a
newer version of wine.
> are broken. fork()ing with an active user LDT at best leaves 2
> processes sharing the LDT. exec()ing with an active LDT leaks
> memory and privilege. exit()Ing with an active LDT leaks memory.
> I guess wine doesn't change the user LDT often enough for the bugs
> to do more than leak memory.
>
> I'd like testing of misconfigured options to be fatal but can't see
> a good way to implement it. A bad way:
> - in opt_global.h, define each option that doesn't belong in opt_global.h
> as an expression with a syntax error.
> - redefine the expression in each opt_foo.h file (same as now, except
> for an #undef to prevent a warning).
> - change each test of an option to use `#if' to ensure an error if the
> expression is not defined properly.
>
> Bruce
>
--
tIM...HOEk
OPTIMIZATION: the process of using many one-letter variables names
hoping that the resultant code will run faster.
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