linux-kernel - Re: [PATCH 7/8] pkeys: add details of system call use to Documentation/

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Date:	Wed, 1 Jun 2016 10:49:37 -0600
From:	Jonathan Corbet <corbet@....net>
To:	Dave Hansen <dave@...1.net>
Cc:	linux-kernel@...r.kernel.org, x86@...nel.org,
	linux-api@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-mm@...ck.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, dave.hansen@...ux.intel.com
Subject: Re: [PATCH 7/8] pkeys: add details of system call use to
 Documentation/

On Wed, 1 Jun 2016 09:46:07 -0700
Dave Hansen <dave@...1.net> wrote:

> On 06/01/2016 09:43 AM, Jonathan Corbet wrote:
> >> > +There are 5 system calls which directly interact with pkeys:
> >> > +
> >> > +	int pkey_alloc(unsigned long flags, unsigned long init_access_rights)
> >> > +	int pkey_free(int pkey);
> >> > +	int sys_pkey_mprotect(unsigned long start, size_t len,
> >> > +			      unsigned long prot, int pkey);
> >> > +	unsigned long pkey_get(int pkey);
> >> > +	int pkey_set(int pkey, unsigned long access_rights);  
> > sys_pkey_mprotect() should just be pkey_mprotect(), right?  
> 
> Yes, and that are a few more instances of that farther down in the file.
>  I'll fix them all up.

While you're at it (I shouldn't have hit send quite so quickly :) 

> +	sys_pkey_alloc(0, PKEY_DISABLE_WRITE | PKEY_DISABLE_READ);
> +	sys_pkey_mprotect(ptr, size, PROT_READ|PROT_WRITE);
> +	something(ptr);

That should, IMO, be something like:

	key = pkey_alloc(...);
	pkey_mprotect(ptr, size, PROT_READ|PROT_WRITE, key);

?


jon