[PATCH 04/24] net: switch copy_bpf_fprog_from_user to sockptr_t
From: Christoph Hellwig <hch@lst.de>
Date: 2020-07-20 12:51:40
Also in:
bpf, bridge, linux-can, linux-crypto, linux-hams, linux-s390, linux-sctp, lkml, lvs-devel, mptcp, netdev, netfilter-devel
Subsystem:
bpf [core], bpf [general] (safe dynamic programs and tools), bpf [networking] (tcx & tc bpf, sock_addr), networking [general], networking [sockets], packet sockets, the rest · Maintainers:
Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Kuniyuki Iwashima, Willem de Bruijn, Linus Torvalds
Pass a sockptr_t to prepare for set_fs-less handling of the kernel pointer from bpf-cgroup. Signed-off-by: Christoph Hellwig <hch@lst.de> --- include/linux/filter.h | 3 ++- net/core/filter.c | 6 +++--- net/core/sock.c | 6 ++++-- net/packet/af_packet.c | 4 ++-- 4 files changed, 11 insertions(+), 8 deletions(-)
diff --git a/include/linux/filter.h b/include/linux/filter.h
index 4d049c8e1fbeaa..87954ef126df77 100644
--- a/include/linux/filter.h
+++ b/include/linux/filter.h@@ -20,6 +20,7 @@ #include <linux/kallsyms.h> #include <linux/if_vlan.h> #include <linux/vmalloc.h> +#include <linux/sockptr.h> #include <crypto/sha.h> #include <net/sch_generic.h>
@@ -1276,6 +1277,6 @@ struct bpf_sockopt_kern { s32 retval; }; -int copy_bpf_fprog_from_user(struct sock_fprog *dst, void __user *src, int len); +int copy_bpf_fprog_from_user(struct sock_fprog *dst, sockptr_t src, int len); #endif /* __LINUX_FILTER_H__ */
diff --git a/net/core/filter.c b/net/core/filter.c
index 2bf6624796d86f..4cc1d381a273fd 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c@@ -77,14 +77,14 @@ #include <net/transp_v6.h> #include <linux/btf_ids.h> -int copy_bpf_fprog_from_user(struct sock_fprog *dst, void __user *src, int len) +int copy_bpf_fprog_from_user(struct sock_fprog *dst, sockptr_t src, int len) { if (in_compat_syscall()) { struct compat_sock_fprog f32; if (len != sizeof(f32)) return -EINVAL; - if (copy_from_user(&f32, src, sizeof(f32))) + if (copy_from_sockptr(&f32, src, sizeof(f32))) return -EFAULT; memset(dst, 0, sizeof(*dst)); dst->len = f32.len;
@@ -92,7 +92,7 @@ int copy_bpf_fprog_from_user(struct sock_fprog *dst, void __user *src, int len) } else { if (len != sizeof(*dst)) return -EINVAL; - if (copy_from_user(dst, src, sizeof(*dst))) + if (copy_from_sockptr(dst, src, sizeof(*dst))) return -EFAULT; }
diff --git a/net/core/sock.c b/net/core/sock.c
index d828bfe1c47dfa..91224709869389 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c@@ -1062,7 +1062,8 @@ int sock_setsockopt(struct socket *sock, int level, int optname, case SO_ATTACH_FILTER: { struct sock_fprog fprog; - ret = copy_bpf_fprog_from_user(&fprog, optval, optlen); + ret = copy_bpf_fprog_from_user(&fprog, USER_SOCKPTR(optval), + optlen); if (!ret) ret = sk_attach_filter(&fprog, sk); break;
@@ -1083,7 +1084,8 @@ 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, optval, optlen); + ret = copy_bpf_fprog_from_user(&fprog, USER_SOCKPTR(optval), + optlen); if (!ret) ret = sk_reuseport_attach_filter(&fprog, sk); break;
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index c240fb5de3f014..d8d4f78f78e451 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c@@ -1536,7 +1536,7 @@ static void __fanout_set_data_bpf(struct packet_fanout *f, struct bpf_prog *new) } } -static int fanout_set_data_cbpf(struct packet_sock *po, char __user *data, +static int fanout_set_data_cbpf(struct packet_sock *po, sockptr_t data, unsigned int len) { struct bpf_prog *new;
@@ -1584,7 +1584,7 @@ static int fanout_set_data(struct packet_sock *po, char __user *data, { switch (po->fanout->type) { case PACKET_FANOUT_CBPF: - return fanout_set_data_cbpf(po, data, len); + return fanout_set_data_cbpf(po, USER_SOCKPTR(data), len); case PACKET_FANOUT_EBPF: return fanout_set_data_ebpf(po, data, len); default:
--
2.27.0