linux-kernel - Re: [PATCH] title: no lookup

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Date:	Mon, 14 Jul 2014 20:59:17 +0200
From:	Paul Bolle <pebolle@...cali.nl>
To:	Nicholas Krause <xerofoify@...il.com>
Cc:	cmetcalf@...era.com, hannes@...xchg.org, mhocko@...e.cz,
	akpm@...ux-foundation.org, zlu@...era.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] title: no lookup_page for if statement

On Mon, 2014-07-14 at 14:49 -0400, Nicholas Krause wrote:
> This patch removes the if define statement for page_lookup in order
> to remove a fix me of this not being defined as of yet.
> 
> Signed-off-by: Nicholas Krause <xerofoify@...il.com>
> ---
>  0001-title-no-lookup_page-for-if-statement.patch | 37 ++++++++++++++++++++++++
>  1 file changed, 37 insertions(+)
>  create mode 100644 0001-title-no-lookup_page-for-if-statement.patch
> 
> diff --git a/0001-title-no-lookup_page-for-if-statement.patch b/0001-title-no-lookup_page-for-if-statement.patch
> new file mode 100644
> index 0000000..f11c12e
> --- /dev/null
> +++ b/0001-title-no-lookup_page-for-if-statement.patch
> @@ -0,0 +1,37 @@
> +From 23c4afac6742d5df1d083ab6335a0a69f38c76b0 Mon Sep 17 00:00:00 2001
> +From: Nicholas Krause <xerofoify@...il.com>
> +Date: Mon, 14 Jul 2014 14:39:02 -0400
> +Subject: [PATCH] title: no lookup_page for if statement
> +
> +This patch removes the if define statement for page_lookup in order
> +to remove a fix me of this not being defined as of yet.
> +
> +Signed-off-by: Nicholas Krause <xerofoify@...il.com>
> +---
> + arch/tile/mm/fault.c | 3 ---
> + 1 file changed, 3 deletions(-)
> +
> +diff --git a/arch/tile/mm/fault.c b/arch/tile/mm/fault.c
> +index 6c05712..2297bf7 100644
> +--- a/arch/tile/mm/fault.c
> ++++ b/arch/tile/mm/fault.c
> +@@ -513,8 +513,6 @@ no_context:
> + 
> + 	bust_spinlocks(1);
> + 
> +-	/* FIXME: no lookup_address() yet */
> +-#ifdef SUPPORT_LOOKUP_ADDRESS

Nicholas, stop! Just stop.

> + 	if (fault_num == INT_ITLB_MISS) {
> + 		pte_t *pte = lookup_address(address);
> + 
> +@@ -523,7 +521,6 @@ no_context:
> + 			       " non-executable page - exploit attempt?"
> + 			       " (uid: %d)\n", current->uid);
> + 	}
> +-#endif
> + 	if (address < PAGE_SIZE)
> + 		pr_alert("Unable to handle kernel NULL pointer dereference\n");
> + 	else
> +-- 
> +1.9.1
> +

For those not yet familiar with this train wreck, please do
    git grep SUPPORT_LOOKUP_ADDRESS


Paul Bolle

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