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Message-ID: <56685F42.8070109@sr71.net> Date: Wed, 9 Dec 2015 09:05:06 -0800 From: Dave Hansen <dave@...1.net> To: mtk.manpages@...il.com Cc: lkml <linux-kernel@...r.kernel.org>, "linux-mm@...ck.org" <linux-mm@...ck.org>, "x86@...nel.org" <x86@...nel.org>, dave.hansen@...ux.intel.com, Linux API <linux-api@...r.kernel.org> Subject: Re: [PATCH 26/34] mm: implement new mprotect_key() system call On 12/09/2015 08:45 AM, Michael Kerrisk (man-pages) wrote: >>> >> * Explanation of what a protection domain is. >> > >> > A protection domain is a unique view of memory and is represented by the >> > value in the PKRU register. > Out something about this in pkey(7), but explain what you mean by a > "unique view of memory". Let's say there are only two protection keys: 0 and 1. There are two disable bits per protection key (Access and Write Disable), so a two-key PKRU looks like: | PKEY0 | PKEY1 | | AD0 | WD0 | AD1 | WD1 | In this example, there are 16 possible protection domains, one for each possible combination of the 4 rights-disable bits. "Changing a protection domain" would mean changing (setting or clearing) the value of any of those 4 bits. Each unique value of PKRU represents a view of memory, or unique protection domain. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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