From: Christoph Hellwig <hch@lst.de>
Date: Thu, 23 Jul 2020 08:08:55 +0200
Subject: bpfilter: switch bpfilter_ip_set_sockopt to sockptr_t
Patch-mainline: v5.9-rc1
Git-commit: b03afaa82ece13b2a008f0e3a7127bead578e3e6
References: bsc#1177028

This is mostly to prepare for cleaning up the callers, as bpfilter by
design can't handle kernel pointers.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Gary Lin <glin@suse.com>
---
 include/linux/bpfilter.h     |    6 +++---
 net/bpfilter/bpfilter_kern.c |    6 +++---
 net/ipv4/bpfilter/sockopt.c  |    8 ++++----
 net/ipv4/ip_sockglue.c       |    3 ++-
 4 files changed, 12 insertions(+), 11 deletions(-)

--- a/include/linux/bpfilter.h
+++ b/include/linux/bpfilter.h
@@ -4,9 +4,10 @@
 
 #include <uapi/linux/bpfilter.h>
 #include <linux/usermode_driver.h>
+#include <linux/sockptr.h>
 
 struct sock;
-int bpfilter_ip_set_sockopt(struct sock *sk, int optname, char __user *optval,
+int bpfilter_ip_set_sockopt(struct sock *sk, int optname, sockptr_t optval,
 			    unsigned int optlen);
 int bpfilter_ip_get_sockopt(struct sock *sk, int optname, char __user *optval,
 			    int __user *optlen);
@@ -16,8 +17,7 @@ struct bpfilter_umh_ops {
 	struct umd_info info;
 	/* since ip_getsockopt() can run in parallel, serialize access to umh */
 	struct mutex lock;
-	int (*sockopt)(struct sock *sk, int optname,
-		       char __user *optval,
+	int (*sockopt)(struct sock *sk, int optname, sockptr_t optval,
 		       unsigned int optlen, bool is_set);
 	int (*start)(void);
 };
--- a/net/bpfilter/bpfilter_kern.c
+++ b/net/bpfilter/bpfilter_kern.c
@@ -60,17 +60,17 @@ stop:
 }
 
 static int bpfilter_process_sockopt(struct sock *sk, int optname,
-				    char __user *optval, unsigned int optlen,
+				    sockptr_t optval, unsigned int optlen,
 				    bool is_set)
 {
 	struct mbox_request req = {
 		.is_set		= is_set,
 		.pid		= current->pid,
 		.cmd		= optname,
-		.addr		= (uintptr_t)optval,
+		.addr		= (uintptr_t)optval.user,
 		.len		= optlen,
 	};
-	if (uaccess_kernel()) {
+	if (uaccess_kernel() || sockptr_is_kernel(optval)) {
 		pr_err("kernel access not supported\n");
 		return -EFAULT;
 	}
--- a/net/ipv4/bpfilter/sockopt.c
+++ b/net/ipv4/bpfilter/sockopt.c
@@ -22,8 +22,7 @@ void bpfilter_umh_cleanup(struct umd_inf
 }
 EXPORT_SYMBOL_GPL(bpfilter_umh_cleanup);
 
-static int bpfilter_mbox_request(struct sock *sk, int optname,
-				 char __user *optval,
+static int bpfilter_mbox_request(struct sock *sk, int optname, sockptr_t optval,
 				 unsigned int optlen, bool is_set)
 {
 	int err;
@@ -53,7 +52,7 @@ out:
 	return err;
 }
 
-int bpfilter_ip_set_sockopt(struct sock *sk, int optname, char __user *optval,
+int bpfilter_ip_set_sockopt(struct sock *sk, int optname, sockptr_t optval,
 			    unsigned int optlen)
 {
 	return bpfilter_mbox_request(sk, optname, optval, optlen, true);
@@ -67,7 +66,8 @@ int bpfilter_ip_get_sockopt(struct sock
 	if (get_user(len, optlen))
 		return -EFAULT;
 
-	return bpfilter_mbox_request(sk, optname, optval, len, false);
+	return bpfilter_mbox_request(sk, optname, USER_SOCKPTR(optval), len,
+				     false);
 }
 
 static int __init bpfilter_sockopt_init(void)
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -1249,7 +1249,8 @@ int ip_setsockopt(struct sock *sk, int l
 #if IS_ENABLED(CONFIG_BPFILTER_UMH)
 	if (optname >= BPFILTER_IPT_SO_SET_REPLACE &&
 	    optname < BPFILTER_IPT_SET_MAX)
-		err = bpfilter_ip_set_sockopt(sk, optname, optval, optlen);
+		err = bpfilter_ip_set_sockopt(sk, optname, USER_SOCKPTR(optval),
+					      optlen);
 #endif
 #ifdef CONFIG_NETFILTER
 	/* we need to exclude all possible ENOPROTOOPTs except default case */