Date: Wed, 15 Jul 1998 18:07:48 -0500 (CDT) From: Joel Ray Holveck <joelh@gnu.org> To: luoqi@watermarkgroup.com Cc: matthew@wolfepub.com, hackers@FreeBSD.ORG Subject: Re: Protecting data in memory Message-ID: <199807152307.SAA15384@detlev.UUCP> In-Reply-To: <199807152155.RAA07159@lor.watermarkgroup.com> (message from Luoqi Chen on Wed, 15 Jul 1998 17:55:54 -0400 (EDT)) References: <199807152155.RAA07159@lor.watermarkgroup.com>
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>>> Is there any way to protect a programs memory space from all users, even >>> root? >> No. root always has access to all memory space. Consider: If it were >> otherwise, root could just patch the kernel and gain whatever access >> was needed. > Actually, if you raise the securelevel to 1 or above, not even root can > access kernel memory space (see init(8)). Er, according to init(8), then root cannot *write* to kernel memory. I am basically familiar with securelevel. I oversimplified my example. Best, joelh -- Joel Ray Holveck - joelh@gnu.org - http://www.wp.com/piquan Fourth law of programming: Anything that can go wrong wi sendmail: segmentation violation - core dumped To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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