From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoph Hellwig Date: Mon, 20 Jul 2020 12:47:31 +0000 Subject: [PATCH 18/24] net/ipv6: switch ipv6_flowlabel_opt to sockptr_t Message-Id: <20200720124737.118617-19-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 Pass a sockptr_t to prepare for set_fs-less handling of the kernel pointer from bpf-cgroup. Note that the get case is pretty weird in that it actually copies data back to userspace from setsockopt. Signed-off-by: Christoph Hellwig --- include/net/ipv6.h | 2 +- net/ipv6/ip6_flowlabel.c | 16 +++++++++------- net/ipv6/ipv6_sockglue.c | 2 +- 3 files changed, 11 insertions(+), 9 deletions(-) diff --git a/include/net/ipv6.h b/include/net/ipv6.h index 262fc88dbd7e2f..4c9d89b5d73268 100644 --- a/include/net/ipv6.h +++ b/include/net/ipv6.h @@ -406,7 +406,7 @@ struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space, struct ip6_flowlabel *fl, struct ipv6_txoptions *fopt); void fl6_free_socklist(struct sock *sk); -int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen); +int ipv6_flowlabel_opt(struct sock *sk, sockptr_t optval, int optlen); int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq, int flags); int ip6_flowlabel_init(void); diff --git a/net/ipv6/ip6_flowlabel.c b/net/ipv6/ip6_flowlabel.c index 27ee6de9beffc4..6b3c315f3d461a 100644 --- a/net/ipv6/ip6_flowlabel.c +++ b/net/ipv6/ip6_flowlabel.c @@ -371,7 +371,7 @@ static int fl6_renew(struct ip6_flowlabel *fl, unsigned long linger, unsigned lo static struct ip6_flowlabel * fl_create(struct net *net, struct sock *sk, struct in6_flowlabel_req *freq, - char __user *optval, int optlen, int *err_p) + sockptr_t optval, int optlen, int *err_p) { struct ip6_flowlabel *fl = NULL; int olen; @@ -401,7 +401,8 @@ fl_create(struct net *net, struct sock *sk, struct in6_flowlabel_req *freq, memset(fl->opt, 0, sizeof(*fl->opt)); fl->opt->tot_len = sizeof(*fl->opt) + olen; err = -EFAULT; - if (copy_from_user(fl->opt+1, optval+CMSG_ALIGN(sizeof(*freq)), olen)) + sockptr_advance(optval, CMSG_ALIGN(sizeof(*freq))); + if (copy_from_sockptr(fl->opt + 1, optval, olen)) goto done; msg.msg_controllen = olen; @@ -604,7 +605,7 @@ static int ipv6_flowlabel_renew(struct sock *sk, struct in6_flowlabel_req *freq) } static int ipv6_flowlabel_get(struct sock *sk, struct in6_flowlabel_req *freq, - void __user *optval, int optlen) + sockptr_t optval, int optlen) { struct ipv6_fl_socklist *sfl, *sfl1 = NULL; struct ip6_flowlabel *fl, *fl1 = NULL; @@ -702,8 +703,9 @@ static int ipv6_flowlabel_get(struct sock *sk, struct in6_flowlabel_req *freq, goto recheck; if (!freq->flr_label) { - if (copy_to_user(&((struct in6_flowlabel_req __user *) optval)->flr_label, - &fl->label, sizeof(fl->label))) { + sockptr_advance(optval, + offsetof(struct in6_flowlabel_req, flr_label)); + if (copy_to_sockptr(optval, &fl->label, sizeof(fl->label))) { /* Intentionally ignore fault. */ } } @@ -716,13 +718,13 @@ static int ipv6_flowlabel_get(struct sock *sk, struct in6_flowlabel_req *freq, return err; } -int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen) +int ipv6_flowlabel_opt(struct sock *sk, sockptr_t optval, int optlen) { struct in6_flowlabel_req freq; if (optlen < sizeof(freq)) return -EINVAL; - if (copy_from_user(&freq, optval, sizeof(freq))) + if (copy_from_sockptr(&freq, optval, sizeof(freq))) return -EFAULT; switch (freq.flr_action) { diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c index 119dfaf5f4bb26..3897fb55372d38 100644 --- a/net/ipv6/ipv6_sockglue.c +++ b/net/ipv6/ipv6_sockglue.c @@ -929,7 +929,7 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname, retv = 0; break; case IPV6_FLOWLABEL_MGR: - retv = ipv6_flowlabel_opt(sk, optval, optlen); + retv = ipv6_flowlabel_opt(sk, USER_SOCKPTR(optval), optlen); break; case IPV6_IPSEC_POLICY: case IPV6_XFRM_POLICY: -- 2.27.0