linux-kernel - Re: [PATCH][RESEND] wistron_btns needs executable BIOS image

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Message-ID: <20190125211349.nfbbcuaip5y6l5dr@dcvr>
Date:   Fri, 25 Jan 2019 21:13:49 +0000
From:   Eric Wong <e@...24.org>
To:     Jakub Bogusz <qboosh@...-linux.org>
Cc:     linux-kernel@...r.kernel.org, mitr@...ny.cz,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        linux-input@...r.kernel.org
Subject: Re: [PATCH][RESEND] wistron_btns needs executable BIOS image

Jakub Bogusz <qboosh@...-linux.org> wrote:
> Let's try once again... (take 3)
> 
> First time I sent this patch when I prepared it in 2013 for Linux 3.12,
> the second time after update for Linux 4.12 in 2017...
> And it still applies to Linux 4.20.

Adding Dmitry Torokhov and linux-input to Cc:
(that's what ./scripts/get_maintainer.pl says)

> Actual description in forwarded message.
> 
> 
> -- 
> Jakub Bogusz    http://qboosh.pl/

> From: Jakub Bogusz <qboosh@...-linux.org>
> To: linux-kernel@...r.kernel.org, mitr@...ny.cz
> Subject: [PATCH] wistron_btns needs executable BIOS image
> 
> Hello,
> 
> This patch (originally agains 3.1x, now I updated include to build
> against 4.12.x) fixes winstron_btns module issue with calling BIOS
> functions in non-executable memory.
> 
> Tested (on Linux 3.10.x and few later versions) on F-S Amilo 8210 laptop.
> 
> 
> -- 
> Jakub Bogusz    http://qboosh.pl/

> wistron_btns needs executable BIOS image.
> 
> Signed-off-by: Jakub Bogusz <qboosh@...-linux.org>
> 
> --- linux-4.12/drivers/input/misc/wistron_btns.c.orig	2013-11-16 09:05:55.612742472 +0100
> +++ linux-4.12/drivers/input/misc/wistron_btns.c	2013-11-16 09:24:37.356028732 +0100
> @@ -33,6 +33,7 @@
>  #include <linux/types.h>
>  #include <linux/platform_device.h>
>  #include <linux/leds.h>
> +#include <asm/set_memory.h>
>  
>  /* How often we poll keys - msecs */
>  #define POLL_INTERVAL_DEFAULT	500 /* when idle */
> @@ -124,6 +125,7 @@
>  	if (entry_point >= 0xF0000) {
>  		bios_code_map_base = base;
>  		bios_entry_point = bios_code_map_base + (entry_point & 0xFFFF);
> +		set_memory_x((unsigned long)bios_code_map_base, 0x10000 >> PAGE_SHIFT);
>  	} else {
>  		iounmap(base);
>  		bios_code_map_base = ioremap(entry_point & ~0x3FFF, 0x4000);
> @@ -134,6 +136,7 @@
>  			goto err;
>  		}
>  		bios_entry_point = bios_code_map_base + (entry_point & 0x3FFF);
> +		set_memory_x((unsigned long)bios_code_map_base, 0x4000 >> PAGE_SHIFT);
>  	}
>  	/* The Windows driver maps 0x10000 bytes, we keep only one page... */
>  	bios_data_map_base = ioremap(0x400, 0xc00);