Re: [PATCH v2 1/2] hibernate: create "nohibernate" boot parameter

[Pavel Machek]

On Thu 2014-06-12 14:00:32, Kees Cook wrote:
> To support using kernel features that are not compatible with hibernation,
> this creates the "nohibernate" kernel boot parameter to disable both
> hibernation and resume. This allows hibernation support to be a boot-time
> choice instead of only a compile-time choice.
> 
> Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>


> @@ -639,6 +645,11 @@ int hibernate(void)
>  {
>  	int error;
>  
> +	if (!hibernation_available()) {
> +		pr_debug("PM: Hibernation not available.\n");
> +		return -EINVAL;
> +	}
> +
>  	lock_system_sleep();
>  	/* The snapshot device should not be opened while we're running */
>  	if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
> @@ -931,6 +945,9 @@ static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr,
>  	char *p;
>  	int mode = HIBERNATION_INVALID;
>  
> +	if (!hibernation_available())
> +		return -EINVAL;
> +
>  	p = memchr(buf, '\n', n);
>  	len = p ? p - buf : n;
>  
> diff --git a/kernel/power/user.c b/kernel/power/user.c
> index 98d357584cd6..000b94419182 100644
> --- a/kernel/power/user.c
> +++ b/kernel/power/user.c
> @@ -49,6 +49,9 @@ static int snapshot_open(struct inode *inode, struct file *filp)
>  	struct snapshot_data *data;
>  	int error;
>  
> +	if (!hibernation_available())
> +		return -EINVAL;
> +
>  	lock_system_sleep();
>  
>  	if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {

Is EINVAL right error code for "root disabled that option"?

Otherwise it looks ok, you can add my ack with that fixed.
									Pavel
-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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