RE: [2/4] crypto: af_alg - Allow arbitrarily long algorithm names" email-alg_bind.txt

[Lukasz Odzioba]

Hi,
I found this patch by accident and it got my attention.
I think we can't make this name arbitrarily long because bind syscall checks addrlen before feeding protocol with it.
Current limit on my machine is 128 bytes and I can't even reach alg_bind() function if I specify more than that.
We may want to revert that.

net/socket.c:
SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen)
{
	struct socket *sock;
	struct sockaddr_storage address;
	int err, fput_needed;

	sock = sockfd_lookup_light(fd, &err, &fput_needed);
	if (sock) {
		err = move_addr_to_kernel(umyaddr, addrlen, (struct sockaddr *)&address);
(...snip...)

int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr)
{
	if (ulen < 0 || ulen > sizeof(struct sockaddr_storage))
		return -EINVAL;
		
Thanks,
Lukas