From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoph Hellwig Date: Mon, 20 Jul 2020 12:47:25 +0000 Subject: [PATCH 12/24] bpfilter: switch bpfilter_ip_set_sockopt to sockptr_t Message-Id: <20200720124737.118617-13-hch@lst.de> List-Id: References: <20200720124737.118617-1-hch@lst.de> In-Reply-To: <20200720124737.118617-1-hch@lst.de> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: "David S. Miller" , Jakub Kicinski , Alexei Starovoitov , Daniel Borkmann , Alexey Kuznetsov , Hideaki YOSHIFUJI , Eric Dumazet Cc: linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, bpf@vger.kernel.org, netfilter-devel@vger.kernel.org, coreteam@netfilter.org, linux-sctp@vger.kernel.org, linux-hams@vger.kernel.org, linux-bluetooth@vger.kernel.org, bridge@lists.linux-foundation.org, linux-can@vger.kernel.org, dccp@vger.kernel.org, linux-decnet-user@lists.sourceforge.net, linux-wpan@vger.kernel.org, linux-s390@vger.kernel.org, mptcp@lists.01.org, lvs-devel@vger.kernel.org, rds-devel@oss.oracle.com, linux-afs@lists.infradead.org, tipc-discussion@lists.sourceforge.net, linux-x25@vger.kernel.org This is mostly to prepare for cleaning up the callers, as bpfilter by design can't handle kernel pointers. Signed-off-by: Christoph Hellwig --- 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 #include +#include 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