Date: Wed, 15 Jul 1998 20:33:32 -0400 (EDT) From: Luoqi Chen <luoqi@watermarkgroup.com> To: joelh@gnu.org, luoqi@watermarkgroup.com Cc: hackers@FreeBSD.ORG, matthew@wolfepub.com Subject: Re: Protecting data in memory Message-ID: <199807160033.UAA08157@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. > Sorry, I was wrong. Root is still able to read kernel memory. My solution won't work. :( -lq > 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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