Re: [PATCH V3 09/11] uswsusp: Disable when module loading isrestricted

[joeyli]

æ äï2013-09-03 æ 19:50 -0400ïMatthew Garrett æåï
> 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@xxxxxxxxxx>

Tested-by: Lee, Chun-Yi <jlee@xxxxxxxx>

> ---
>  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


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/