linux-kernel - Re: [PATCH 03/12] __wr_after

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Message-Id: <8474D7CA-E5FF-40B1-9428-855854CDDB5F@gmail.com>
Date:   Fri, 21 Dec 2018 11:38:16 -0800
From:   Nadav Amit <nadav.amit@...il.com>
To:     Igor Stoppa <igor.stoppa@...il.com>
Cc:     Andy Lutomirski <luto@...capital.net>,
        Matthew Wilcox <willy@...radead.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Mimi Zohar <zohar@...ux.vnet.ibm.com>, igor.stoppa@...wei.com,
        Kees Cook <keescook@...omium.org>,
        linux-integrity@...r.kernel.org,
        kernel-hardening@...ts.openwall.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 03/12] __wr_after_init: generic header

> On Dec 19, 2018, at 1:33 PM, Igor Stoppa <igor.stoppa@...il.com> wrote:
> 
> +static inline void *wr_memset(void *p, int c, __kernel_size_t len)
> +{
> +	return __wr_op((unsigned long)p, (unsigned long)c, len, WR_MEMSET);
> +}

What do you think about doing something like:

#define __wr          __attribute__((address_space(5)))

And then make all the pointers to write-rarely memory to use this attribute?
It might require more changes to the code, but can prevent bugs.