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![Matthias Rosenfelder](/assets/img/avatar_default.png)
copy_to_user() copies the struct the pointer is pointing to, but the length check compares against sizeof(pointer) and not sizeof(struct). On 32-bit the size is probably the same, so it might have worked accidentally. Signed-off-by: Matthias Rosenfelder <mrosenfelder.lkml@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
489 lines
10 KiB
C
489 lines
10 KiB
C
/*
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* Copyright (c) 2016-2017, Mellanox Technologies. All rights reserved.
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* Copyright (c) 2016-2017, Dave Watson <davejwatson@fb.com>. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <linux/module.h>
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#include <net/tcp.h>
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#include <net/inet_common.h>
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#include <linux/highmem.h>
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#include <linux/netdevice.h>
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#include <linux/sched/signal.h>
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#include <net/tls.h>
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MODULE_AUTHOR("Mellanox Technologies");
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MODULE_DESCRIPTION("Transport Layer Security Support");
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MODULE_LICENSE("Dual BSD/GPL");
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static struct proto tls_base_prot;
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static struct proto tls_sw_prot;
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int wait_on_pending_writer(struct sock *sk, long *timeo)
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{
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int rc = 0;
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DEFINE_WAIT_FUNC(wait, woken_wake_function);
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add_wait_queue(sk_sleep(sk), &wait);
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while (1) {
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if (!*timeo) {
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rc = -EAGAIN;
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break;
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}
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if (signal_pending(current)) {
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rc = sock_intr_errno(*timeo);
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break;
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}
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if (sk_wait_event(sk, timeo, !sk->sk_write_pending, &wait))
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break;
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}
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remove_wait_queue(sk_sleep(sk), &wait);
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return rc;
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}
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int tls_push_sg(struct sock *sk,
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struct tls_context *ctx,
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struct scatterlist *sg,
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u16 first_offset,
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int flags)
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{
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int sendpage_flags = flags | MSG_SENDPAGE_NOTLAST;
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int ret = 0;
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struct page *p;
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size_t size;
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int offset = first_offset;
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size = sg->length - offset;
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offset += sg->offset;
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while (1) {
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if (sg_is_last(sg))
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sendpage_flags = flags;
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/* is sending application-limited? */
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tcp_rate_check_app_limited(sk);
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p = sg_page(sg);
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retry:
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ret = do_tcp_sendpages(sk, p, offset, size, sendpage_flags);
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if (ret != size) {
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if (ret > 0) {
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offset += ret;
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size -= ret;
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goto retry;
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}
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offset -= sg->offset;
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ctx->partially_sent_offset = offset;
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ctx->partially_sent_record = (void *)sg;
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return ret;
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}
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put_page(p);
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sk_mem_uncharge(sk, sg->length);
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sg = sg_next(sg);
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if (!sg)
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break;
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offset = sg->offset;
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size = sg->length;
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}
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clear_bit(TLS_PENDING_CLOSED_RECORD, &ctx->flags);
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return 0;
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}
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static int tls_handle_open_record(struct sock *sk, int flags)
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{
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struct tls_context *ctx = tls_get_ctx(sk);
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if (tls_is_pending_open_record(ctx))
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return ctx->push_pending_record(sk, flags);
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return 0;
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}
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int tls_proccess_cmsg(struct sock *sk, struct msghdr *msg,
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unsigned char *record_type)
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{
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struct cmsghdr *cmsg;
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int rc = -EINVAL;
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for_each_cmsghdr(cmsg, msg) {
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if (!CMSG_OK(msg, cmsg))
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return -EINVAL;
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if (cmsg->cmsg_level != SOL_TLS)
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continue;
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switch (cmsg->cmsg_type) {
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case TLS_SET_RECORD_TYPE:
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if (cmsg->cmsg_len < CMSG_LEN(sizeof(*record_type)))
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return -EINVAL;
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if (msg->msg_flags & MSG_MORE)
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return -EINVAL;
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rc = tls_handle_open_record(sk, msg->msg_flags);
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if (rc)
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return rc;
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*record_type = *(unsigned char *)CMSG_DATA(cmsg);
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rc = 0;
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break;
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default:
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return -EINVAL;
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}
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}
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return rc;
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}
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int tls_push_pending_closed_record(struct sock *sk, struct tls_context *ctx,
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int flags, long *timeo)
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{
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struct scatterlist *sg;
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u16 offset;
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if (!tls_is_partially_sent_record(ctx))
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return ctx->push_pending_record(sk, flags);
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sg = ctx->partially_sent_record;
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offset = ctx->partially_sent_offset;
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ctx->partially_sent_record = NULL;
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return tls_push_sg(sk, ctx, sg, offset, flags);
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}
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static void tls_write_space(struct sock *sk)
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{
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struct tls_context *ctx = tls_get_ctx(sk);
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if (!sk->sk_write_pending && tls_is_pending_closed_record(ctx)) {
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gfp_t sk_allocation = sk->sk_allocation;
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int rc;
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long timeo = 0;
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sk->sk_allocation = GFP_ATOMIC;
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rc = tls_push_pending_closed_record(sk, ctx,
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MSG_DONTWAIT |
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MSG_NOSIGNAL,
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&timeo);
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sk->sk_allocation = sk_allocation;
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if (rc < 0)
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return;
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}
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ctx->sk_write_space(sk);
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}
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static void tls_sk_proto_close(struct sock *sk, long timeout)
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{
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struct tls_context *ctx = tls_get_ctx(sk);
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long timeo = sock_sndtimeo(sk, 0);
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void (*sk_proto_close)(struct sock *sk, long timeout);
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lock_sock(sk);
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if (!tls_complete_pending_work(sk, ctx, 0, &timeo))
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tls_handle_open_record(sk, 0);
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if (ctx->partially_sent_record) {
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struct scatterlist *sg = ctx->partially_sent_record;
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while (1) {
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put_page(sg_page(sg));
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sk_mem_uncharge(sk, sg->length);
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if (sg_is_last(sg))
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break;
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sg++;
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}
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}
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ctx->free_resources(sk);
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kfree(ctx->rec_seq);
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kfree(ctx->iv);
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sk_proto_close = ctx->sk_proto_close;
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kfree(ctx);
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release_sock(sk);
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sk_proto_close(sk, timeout);
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}
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static int do_tls_getsockopt_tx(struct sock *sk, char __user *optval,
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int __user *optlen)
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{
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int rc = 0;
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struct tls_context *ctx = tls_get_ctx(sk);
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struct tls_crypto_info *crypto_info;
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int len;
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if (get_user(len, optlen))
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return -EFAULT;
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if (!optval || (len < sizeof(*crypto_info))) {
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rc = -EINVAL;
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goto out;
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}
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if (!ctx) {
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rc = -EBUSY;
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goto out;
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}
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/* get user crypto info */
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crypto_info = &ctx->crypto_send;
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if (!TLS_CRYPTO_INFO_READY(crypto_info)) {
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rc = -EBUSY;
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goto out;
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}
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if (len == sizeof(*crypto_info)) {
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if (copy_to_user(optval, crypto_info, sizeof(*crypto_info)))
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rc = -EFAULT;
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goto out;
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}
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switch (crypto_info->cipher_type) {
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case TLS_CIPHER_AES_GCM_128: {
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struct tls12_crypto_info_aes_gcm_128 *
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crypto_info_aes_gcm_128 =
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container_of(crypto_info,
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struct tls12_crypto_info_aes_gcm_128,
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info);
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if (len != sizeof(*crypto_info_aes_gcm_128)) {
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rc = -EINVAL;
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goto out;
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}
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lock_sock(sk);
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memcpy(crypto_info_aes_gcm_128->iv, ctx->iv,
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TLS_CIPHER_AES_GCM_128_IV_SIZE);
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release_sock(sk);
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if (copy_to_user(optval,
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crypto_info_aes_gcm_128,
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sizeof(*crypto_info_aes_gcm_128)))
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rc = -EFAULT;
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break;
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}
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default:
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rc = -EINVAL;
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}
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out:
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return rc;
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}
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static int do_tls_getsockopt(struct sock *sk, int optname,
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char __user *optval, int __user *optlen)
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{
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int rc = 0;
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switch (optname) {
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case TLS_TX:
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rc = do_tls_getsockopt_tx(sk, optval, optlen);
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break;
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default:
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rc = -ENOPROTOOPT;
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break;
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}
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return rc;
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}
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static int tls_getsockopt(struct sock *sk, int level, int optname,
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char __user *optval, int __user *optlen)
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{
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struct tls_context *ctx = tls_get_ctx(sk);
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if (level != SOL_TLS)
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return ctx->getsockopt(sk, level, optname, optval, optlen);
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return do_tls_getsockopt(sk, optname, optval, optlen);
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}
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static int do_tls_setsockopt_tx(struct sock *sk, char __user *optval,
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unsigned int optlen)
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{
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struct tls_crypto_info *crypto_info, tmp_crypto_info;
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struct tls_context *ctx = tls_get_ctx(sk);
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struct proto *prot = NULL;
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int rc = 0;
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if (!optval || (optlen < sizeof(*crypto_info))) {
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rc = -EINVAL;
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goto out;
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}
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rc = copy_from_user(&tmp_crypto_info, optval, sizeof(*crypto_info));
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if (rc) {
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rc = -EFAULT;
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goto out;
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}
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/* check version */
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if (tmp_crypto_info.version != TLS_1_2_VERSION) {
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rc = -ENOTSUPP;
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goto out;
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}
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/* get user crypto info */
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crypto_info = &ctx->crypto_send;
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/* Currently we don't support set crypto info more than one time */
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if (TLS_CRYPTO_INFO_READY(crypto_info))
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goto out;
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switch (tmp_crypto_info.cipher_type) {
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case TLS_CIPHER_AES_GCM_128: {
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if (optlen != sizeof(struct tls12_crypto_info_aes_gcm_128)) {
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rc = -EINVAL;
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goto out;
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}
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rc = copy_from_user(
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crypto_info,
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optval,
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sizeof(struct tls12_crypto_info_aes_gcm_128));
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if (rc) {
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rc = -EFAULT;
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goto err_crypto_info;
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}
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break;
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}
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default:
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rc = -EINVAL;
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goto out;
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}
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ctx->sk_write_space = sk->sk_write_space;
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sk->sk_write_space = tls_write_space;
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ctx->sk_proto_close = sk->sk_prot->close;
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/* currently SW is default, we will have ethtool in future */
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rc = tls_set_sw_offload(sk, ctx);
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prot = &tls_sw_prot;
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if (rc)
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goto err_crypto_info;
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sk->sk_prot = prot;
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goto out;
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err_crypto_info:
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memset(crypto_info, 0, sizeof(*crypto_info));
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out:
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return rc;
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}
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static int do_tls_setsockopt(struct sock *sk, int optname,
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char __user *optval, unsigned int optlen)
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{
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int rc = 0;
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switch (optname) {
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case TLS_TX:
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lock_sock(sk);
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rc = do_tls_setsockopt_tx(sk, optval, optlen);
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release_sock(sk);
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break;
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default:
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rc = -ENOPROTOOPT;
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break;
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}
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return rc;
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}
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static int tls_setsockopt(struct sock *sk, int level, int optname,
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char __user *optval, unsigned int optlen)
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{
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struct tls_context *ctx = tls_get_ctx(sk);
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if (level != SOL_TLS)
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return ctx->setsockopt(sk, level, optname, optval, optlen);
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return do_tls_setsockopt(sk, optname, optval, optlen);
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}
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static int tls_init(struct sock *sk)
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{
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struct inet_connection_sock *icsk = inet_csk(sk);
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struct tls_context *ctx;
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int rc = 0;
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/* allocate tls context */
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ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
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if (!ctx) {
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rc = -ENOMEM;
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goto out;
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}
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icsk->icsk_ulp_data = ctx;
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ctx->setsockopt = sk->sk_prot->setsockopt;
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ctx->getsockopt = sk->sk_prot->getsockopt;
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sk->sk_prot = &tls_base_prot;
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out:
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return rc;
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}
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static struct tcp_ulp_ops tcp_tls_ulp_ops __read_mostly = {
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.name = "tls",
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.owner = THIS_MODULE,
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.init = tls_init,
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};
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static int __init tls_register(void)
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{
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tls_base_prot = tcp_prot;
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tls_base_prot.setsockopt = tls_setsockopt;
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tls_base_prot.getsockopt = tls_getsockopt;
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tls_sw_prot = tls_base_prot;
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tls_sw_prot.sendmsg = tls_sw_sendmsg;
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tls_sw_prot.sendpage = tls_sw_sendpage;
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tls_sw_prot.close = tls_sk_proto_close;
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tcp_register_ulp(&tcp_tls_ulp_ops);
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return 0;
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}
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static void __exit tls_unregister(void)
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{
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tcp_unregister_ulp(&tcp_tls_ulp_ops);
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}
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module_init(tls_register);
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module_exit(tls_unregister);
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