Date: Sat, 19 Sep 2009 00:13:13 +0900 (JST) From: Hideki EIRAKU <hdk_2@yahoo.co.jp> To: pieter@thedarkside.nl Cc: freebsd-security@freebsd.org Subject: Re: Protecting against kernel NULL-pointer derefs Message-ID: <20090919.001313.110616099.hdk_2@yahoo.co.jp> In-Reply-To: <4AAF4A64.3080906@thedarkside.nl> References: <4AAF4A64.3080906@thedarkside.nl>
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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/
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