linux-kernel - Re: [PATCH 04/12] __wr_after_init: x86_64: __wr

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Date:   Thu, 20 Dec 2018 18:53:25 +0200
From:   Igor Stoppa <igor.stoppa@...il.com>
To:     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>
Cc:     igor.stoppa@...wei.com, Nadav Amit <nadav.amit@...il.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 04/12] __wr_after_init: x86_64: __wr_op

On 19/12/2018 23:33, Igor Stoppa wrote:

> +	if (WARN_ONCE(op >= WR_OPS_NUMBER, "Invalid WR operation.") ||
> +	    WARN_ONCE(!is_wr_after_init(dst, len), "Invalid WR range."))
> +		return (void *)dst;
> +
> +	offset = dst - (unsigned long)&__start_wr_after_init;

I forgot to remove the offset.
If the whole kernel memory is remapped, it is shifted by wr_poking_base.
I'll fix it in the next iteration.

> +	wr_poking_addr = wr_poking_base + offset;

	wr_poking_addr = wr_poking_base + dst;

--
igor