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Date:   Mon, 20 Jul 2020 14:47:20 +0200
From:   Christoph Hellwig <hch@....de>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Eric Dumazet <edumazet@...gle.com>
Cc:     linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org,
        netfilter-devel@...r.kernel.org, coreteam@...filter.org,
        linux-sctp@...r.kernel.org, linux-hams@...r.kernel.org,
        linux-bluetooth@...r.kernel.org, bridge@...ts.linux-foundation.org,
        linux-can@...r.kernel.org, dccp@...r.kernel.org,
        linux-decnet-user@...ts.sourceforge.net,
        linux-wpan@...r.kernel.org, linux-s390@...r.kernel.org,
        mptcp@...ts.01.org, lvs-devel@...r.kernel.org,
        rds-devel@....oracle.com, linux-afs@...ts.infradead.org,
        tipc-discussion@...ts.sourceforge.net, linux-x25@...r.kernel.org
Subject: [PATCH 07/24] net: switch sock_set_timeout to sockptr_t

Pass a sockptr_t to prepare for set_fs-less handling of the kernel
pointer from bpf-cgroup.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 include/net/sock.h   |  3 ++-
 net/core/sock.c      | 26 ++++++++++++--------------
 net/mptcp/protocol.c |  6 ++++--
 net/socket.c         |  3 ++-
 4 files changed, 20 insertions(+), 18 deletions(-)

diff --git a/include/net/sock.h b/include/net/sock.h
index 62e18fc8ac9f96..bfb2fe2fc36876 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -59,6 +59,7 @@
 #include <linux/filter.h>
 #include <linux/rculist_nulls.h>
 #include <linux/poll.h>
+#include <linux/sockptr.h>
 
 #include <linux/atomic.h>
 #include <linux/refcount.h>
@@ -1669,7 +1670,7 @@ void sock_pfree(struct sk_buff *skb);
 #endif
 
 int sock_setsockopt(struct socket *sock, int level, int op,
-		    char __user *optval, unsigned int optlen);
+		    sockptr_t optval, unsigned int optlen);
 
 int sock_getsockopt(struct socket *sock, int level, int op,
 		    char __user *optval, int __user *optlen);
diff --git a/net/core/sock.c b/net/core/sock.c
index d45bb1c2c36abf..9cf8318bc51de4 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -825,7 +825,7 @@ EXPORT_SYMBOL(sock_set_rcvbuf);
  */
 
 int sock_setsockopt(struct socket *sock, int level, int optname,
-		    char __user *optval, unsigned int optlen)
+		    sockptr_t optval, unsigned int optlen)
 {
 	struct sock_txtime sk_txtime;
 	struct sock *sk = sock->sk;
@@ -839,12 +839,12 @@ int sock_setsockopt(struct socket *sock, int level, int optname,
 	 */
 
 	if (optname == SO_BINDTODEVICE)
-		return sock_setbindtodevice(sk, USER_SOCKPTR(optval), optlen);
+		return sock_setbindtodevice(sk, optval, optlen);
 
 	if (optlen < sizeof(int))
 		return -EINVAL;
 
-	if (get_user(val, (int __user *)optval))
+	if (copy_from_sockptr(&val, optval, sizeof(val)))
 		return -EFAULT;
 
 	valbool = val ? 1 : 0;
@@ -957,7 +957,7 @@ int sock_setsockopt(struct socket *sock, int level, int optname,
 			ret = -EINVAL;	/* 1003.1g */
 			break;
 		}
-		if (copy_from_user(&ling, optval, sizeof(ling))) {
+		if (copy_from_sockptr(&ling, optval, sizeof(ling))) {
 			ret = -EFAULT;
 			break;
 		}
@@ -1051,21 +1051,20 @@ int sock_setsockopt(struct socket *sock, int level, int optname,
 
 	case SO_RCVTIMEO_OLD:
 	case SO_RCVTIMEO_NEW:
-		ret = sock_set_timeout(&sk->sk_rcvtimeo, USER_SOCKPTR(optval),
+		ret = sock_set_timeout(&sk->sk_rcvtimeo, optval,
 				       optlen, optname == SO_RCVTIMEO_OLD);
 		break;
 
 	case SO_SNDTIMEO_OLD:
 	case SO_SNDTIMEO_NEW:
-		ret = sock_set_timeout(&sk->sk_sndtimeo, USER_SOCKPTR(optval),
+		ret = sock_set_timeout(&sk->sk_sndtimeo, optval,
 				       optlen, optname == SO_SNDTIMEO_OLD);
 		break;
 
 	case SO_ATTACH_FILTER: {
 		struct sock_fprog fprog;
 
-		ret = copy_bpf_fprog_from_user(&fprog, USER_SOCKPTR(optval),
-					       optlen);
+		ret = copy_bpf_fprog_from_user(&fprog, optval, optlen);
 		if (!ret)
 			ret = sk_attach_filter(&fprog, sk);
 		break;
@@ -1076,7 +1075,7 @@ int sock_setsockopt(struct socket *sock, int level, int optname,
 			u32 ufd;
 
 			ret = -EFAULT;
-			if (copy_from_user(&ufd, optval, sizeof(ufd)))
+			if (copy_from_sockptr(&ufd, optval, sizeof(ufd)))
 				break;
 
 			ret = sk_attach_bpf(ufd, sk);
@@ -1086,8 +1085,7 @@ int sock_setsockopt(struct socket *sock, int level, int optname,
 	case SO_ATTACH_REUSEPORT_CBPF: {
 		struct sock_fprog fprog;
 
-		ret = copy_bpf_fprog_from_user(&fprog, USER_SOCKPTR(optval),
-					       optlen);
+		ret = copy_bpf_fprog_from_user(&fprog, optval, optlen);
 		if (!ret)
 			ret = sk_reuseport_attach_filter(&fprog, sk);
 		break;
@@ -1098,7 +1096,7 @@ int sock_setsockopt(struct socket *sock, int level, int optname,
 			u32 ufd;
 
 			ret = -EFAULT;
-			if (copy_from_user(&ufd, optval, sizeof(ufd)))
+			if (copy_from_sockptr(&ufd, optval, sizeof(ufd)))
 				break;
 
 			ret = sk_reuseport_attach_bpf(ufd, sk);
@@ -1178,7 +1176,7 @@ int sock_setsockopt(struct socket *sock, int level, int optname,
 
 		if (sizeof(ulval) != sizeof(val) &&
 		    optlen >= sizeof(ulval) &&
-		    get_user(ulval, (unsigned long __user *)optval)) {
+		    copy_from_sockptr(&ulval, optval, sizeof(ulval))) {
 			ret = -EFAULT;
 			break;
 		}
@@ -1221,7 +1219,7 @@ int sock_setsockopt(struct socket *sock, int level, int optname,
 		if (optlen != sizeof(struct sock_txtime)) {
 			ret = -EINVAL;
 			break;
-		} else if (copy_from_user(&sk_txtime, optval,
+		} else if (copy_from_sockptr(&sk_txtime, optval,
 			   sizeof(struct sock_txtime))) {
 			ret = -EFAULT;
 			break;
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index f0b0b503c2628d..27b6f250b87dfd 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -1643,7 +1643,8 @@ static int mptcp_setsockopt_sol_socket(struct mptcp_sock *msk, int optname,
 			return -EINVAL;
 		}
 
-		ret = sock_setsockopt(ssock, SOL_SOCKET, optname, optval, optlen);
+		ret = sock_setsockopt(ssock, SOL_SOCKET, optname,
+				      USER_SOCKPTR(optval), optlen);
 		if (ret == 0) {
 			if (optname == SO_REUSEPORT)
 				sk->sk_reuseport = ssock->sk->sk_reuseport;
@@ -1654,7 +1655,8 @@ static int mptcp_setsockopt_sol_socket(struct mptcp_sock *msk, int optname,
 		return ret;
 	}
 
-	return sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname, optval, optlen);
+	return sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname,
+			       USER_SOCKPTR(optval), optlen);
 }
 
 static int mptcp_setsockopt_v6(struct mptcp_sock *msk, int optname,
diff --git a/net/socket.c b/net/socket.c
index 93846568c2fb7a..c97f83d879ae75 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -2130,7 +2130,8 @@ int __sys_setsockopt(int fd, int level, int optname, char __user *optval,
 	}
 
 	if (level == SOL_SOCKET && !sock_use_custom_sol_socket(sock))
-		err = sock_setsockopt(sock, level, optname, optval, optlen);
+		err = sock_setsockopt(sock, level, optname,
+				      USER_SOCKPTR(optval), optlen);
 	else if (unlikely(!sock->ops->setsockopt))
 		err = -EOPNOTSUPP;
 	else
-- 
2.27.0

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