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@xxxxxx>
---
include/linux/bpfilter.h | 6 +++---
net/bpfilter/bpfilter_kern.c | 8 ++++----
net/ipv4/bpfilter/sockopt.c | 8 ++++----
net/ipv4/ip_sockglue.c | 3 ++-
4 files changed, 13 insertions(+), 12 deletions(-)
diff --git a/include/linux/bpfilter.h b/include/linux/bpfilter.h
index 9b114c718a7617..2ae3c8e1d83c43 100644
--- 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);
};
diff --git a/net/bpfilter/bpfilter_kern.c b/net/bpfilter/bpfilter_kern.c
index 713b4b3d02005d..52f8d0bc3f6b29 100644
--- a/net/bpfilter/bpfilter_kern.c
+++ b/net/bpfilter/bpfilter_kern.c
@@ -32,7 +32,7 @@ static void __stop_umh(void)
}
static int __bpfilter_process_sockopt(struct sock *sk, int optname,
- char __user *optval,
+ sockptr_t optval,
unsigned int optlen, bool is_set)
{
struct mbox_request req;
@@ -41,7 +41,7 @@ static int __bpfilter_process_sockopt(struct sock *sk, int optname,
ssize_t n;
int ret = -EFAULT;
- if (uaccess_kernel()) {
+ if (uaccess_kernel() || sockptr_is_kernel(optval)) {
pr_err("kernel access not supported\n");
return -EFAULT;
}
@@ -49,7 +49,7 @@ static int __bpfilter_process_sockopt(struct sock *sk, int optname,
req.is_set = is_set;
req.pid = current->pid;
req.cmd = optname;
- req.addr = (__force long)optval;
+ req.addr = (__force long)optval.user;
req.len = optlen;
if (!bpfilter_ops.info.tgid)
goto out;
@@ -87,7 +87,7 @@ static int start_umh(void)
pr_info("Loaded bpfilter_umh pid %d\n", pid_nr(bpfilter_ops.info.tgid));
/* health check that usermode process started correctly */
- if (__bpfilter_process_sockopt(NULL, 0, NULL, 0, 0) != 0) {
+ if (__bpfilter_process_sockopt(NULL, 0, USER_SOCKPTR(NULL), 0, 0)) {
shutdown_umh();
return -EFAULT;
}
diff --git a/net/ipv4/bpfilter/sockopt.c b/net/ipv4/bpfilter/sockopt.c
index 9063c6767d3410..1b34cb9a7708ec 100644
--- a/net/ipv4/bpfilter/sockopt.c
+++ b/net/ipv4/bpfilter/sockopt.c
@@ -21,8 +21,7 @@ void bpfilter_umh_cleanup(struct umd_info *info)
}
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;
@@ -52,7 +51,7 @@ static int bpfilter_mbox_request(struct sock *sk, int optname,
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);
@@ -66,7 +65,8 @@ int bpfilter_ip_get_sockopt(struct sock *sk, int optname, char __user *optval,
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)
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index 42befbf12846c0..36f746e01741f6 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -1414,7 +1414,8 @@ int ip_setsockopt(struct sock *sk, int level,
#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 */
--
2.27.0
