Re: [PATCH] lib: introduce strdup_from_user

[Timur Tabi <timur@freescale.com>]

Alexey Dobriyan wrote:
> The point is data should cross kernelspace/userspace boundary only once.

And my new version does that.  I'm just asking if you're okay with it.

Let me repost the whole function:

char *strdup_from_user(const char __user *ustr, size_t max)
{
	size_t len;
	char *str;

	str = kzalloc(max, GFP_KERNEL);
	if (!str)
		return ERR_PTR(-ENOMEM);

	if (copy_from_user(str, ustr, max - 1)) {
		kfree(str);
		return ERR_PTR(-EFAULT);
	}

	return krealloc(str, strlen(str) + 1, GFP_KERNEL);
}


-- 
Timur Tabi
Linux kernel developer at Freescale