Subject: Re: 4.4-rc5: ugly warn on: 5 W+X pages found
To: Andy Lutomirski <luto@amacapital.net>, Pavel Machek <pavel@ucw.cz>
References: <20151115070022.GA15417@amd> <20151214080403.GA3708@amd>
 <20151214085803.GA10520@pd.tnic> <20151214090726.GA6472@amd>
 <CA+55aFwivS6pnNKqy6aFrh4H5HC2izW_Rw0GL1hV9EdbV+HhkA@mail.gmail.com>
 <20151214202627.GA15104@amd>
 <CALCETrX6DrW2AJz=WGjMW+nNTsq08+Cte0m=CF_Q9+uzsuR1vA@mail.gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
        Borislav Petkov <bp@alien8.de>,
        kernel list <linux-kernel@vger.kernel.org>,
        Stephen Smalley <sds@tycho.nsa.gov>, Brian Gerst <brgerst@gmail.com>,
        Denys Vlasenko <dvlasenk@redhat.com>, Peter Anvin <hpa@zytor.com>,
        Mike Galbraith <efault@gmx.de>, Peter Zijlstra <peterz@infradead.org>,
        Thomas Gleixner <tglx@linutronix.de>
From: Arjan van de Ven <arjan@linux.intel.com>
Message-ID: <566F3378.8070009@linux.intel.com>
Date: Mon, 14 Dec 2015 13:24:08 -0800
User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:38.0) Gecko/20100101
 Thunderbird/38.4.0
MIME-Version: 1.0
In-Reply-To: <CALCETrX6DrW2AJz=WGjMW+nNTsq08+Cte0m=CF_Q9+uzsuR1vA@mail.gmail.com>
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 620
Lines: 14


> That's weird.  The only API to do that seems to be manually setting
> kmap_prot to _PAGE_KERNEL_EXEC, and nothing does that.  (Why is
> kmap_prot a variable on x86 at all?  It has exactly one writer, and
> that's the code that initializes it in the first place.  Shouldn't we
> #define kmap_prot _PAGE_KERNEL?

iirc it changes based on runtime detection of NX capability

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/