linux-kernel - Re: [PATCH V3 09/11] uswsusp: Disable when module loading is restricted

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Message-ID: <1378351226.6380.84.camel@linux-s257.site>
Date:	Thu, 05 Sep 2013 11:20:26 +0800
From:	joeyli <jlee@...e.com>
To:	Matthew Garrett <matthew.garrett@...ula.com>
Cc:	linux-kernel@...r.kernel.org, linux-efi@...r.kernel.org,
	keescook@...omium.org, hpa@...or.com
Subject: Re: [PATCH V3 09/11] uswsusp: Disable when module loading is
 restricted

於 二，2013-09-03 於 19:50 -0400，Matthew Garrett 提到：
> uswsusp allows a user process to dump and then restore kernel state, which
> makes it possible to avoid module loading restrictions. Prevent this when
> any restrictions have been imposed on loading modules.
> 
> Signed-off-by: Matthew Garrett <matthew.garrett@...ula.com>

Tested-by: Lee, Chun-Yi <jlee@...e.com>

> ---
>  kernel/power/user.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/kernel/power/user.c b/kernel/power/user.c
> index 4ed81e7..15cb72f 100644
> --- a/kernel/power/user.c
> +++ b/kernel/power/user.c
> @@ -24,6 +24,7 @@
>  #include <linux/console.h>
>  #include <linux/cpu.h>
>  #include <linux/freezer.h>
> +#include <linux/module.h>
>  
>  #include <asm/uaccess.h>
>  
> @@ -48,6 +49,9 @@ static int snapshot_open(struct inode *inode, struct file *filp)
>  	struct snapshot_data *data;
>  	int error;
>  
> +	if (secure_modules())
> +		return -EPERM;
> +
>  	lock_system_sleep();
>  
>  	if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {

Thanks
Joey Lee


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