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SubjectRe: [PATCH][RESEND] wistron_btns needs executable BIOS image
Jakub Bogusz <qboosh@pld-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@pld-linux.org>
> To: linux-kernel@vger.kernel.org, mitr@volny.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@pld-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);

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