Date: Fri, 18 Sep 2009 16:52:03 +0100 From: =?ISO-8859-1?B?SXN0duFu?= <leccine@gmail.com> To: Hideki EIRAKU <hdk_2@yahoo.co.jp> Cc: freebsd-security@freebsd.org, pieter@thedarkside.nl Subject: Re: Protecting against kernel NULL-pointer derefs Message-ID: <b8592ed80909180852r6f088176oe60fe598b797d636@mail.gmail.com> In-Reply-To: <20090919.001313.110616099.hdk_2@yahoo.co.jp> References: <4AAF4A64.3080906@thedarkside.nl> <20090919.001313.110616099.hdk_2@yahoo.co.jp>
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the question is how much percent of the user are using wine and dosbox which are going to break with this setting, i guess 10% or less. So those guys could use _NO_VM_MIN kernel or something while the rest of the world would fly high with secured kernel. to quote a security friend: the freebsd was the last target platform for this bugclass :)) regards, Istvan On Fri, Sep 18, 2009 at 4:13 PM, Hideki EIRAKU <hdk_2@yahoo.co.jp> wrote: > From: Pieter de Boer <pieter@thedarkside.nl> > Subject: Protecting against kernel NULL-pointer derefs > Date: Tue, 15 Sep 2009 10:03:48 +0200 > > > - Are there unwanted side-effects of raising VM_MIN_ADDRESS? > > Mapping at address 0x0 is needed by some softwares using vm86 mode. > For example, emulators/doscmd uses vm86 mode to emulate an old DOS > environment. In this case, the address 0x0 - 0x3ff is used for an > interrupt vector of emulated DOS world. If VM_MIN_ADDRESS is not zero, > doscmd doesn't work. vm86 mode is in 32bit i386 architecture only, not > in amd64 or other architectures. > > -- > Hideki EIRAKU > -------------------------------------- > Thanks 10 years! Yahoo! Shopping and Yahoo! Auctions > http://pr.mail.yahoo.co.jp/ec10years/ > _______________________________________________ > freebsd-security@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-security > To unsubscribe, send any mail to "freebsd-security-unsubscribe@freebsd.org > " > -- the sun shines for all
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