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Message-Id: <20230511142535.732324-9-cgzones@googlemail.com>
Date: Thu, 11 May 2023 16:25:32 +0200
From: Christian Göttsche <cgzones@...glemail.com>
To: selinux@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Alexander Aring <alex.aring@...il.com>,
Stefan Schmidt <stefan@...enfreihafen.org>,
Miquel Raynal <miquel.raynal@...tlin.com>,
David Ahern <dsahern@...nel.org>,
Keith Busch <kbusch@...nel.org>,
Kuniyuki Iwashima <kuniyu@...zon.com>,
Christophe JAILLET <christophe.jaillet@...adoo.fr>,
Alexei Starovoitov <ast@...nel.org>,
Martin KaFai Lau <martin.lau@...nel.org>,
Xin Long <lucien.xin@...il.com>,
Alexander Duyck <alexanderduyck@...com>,
Jason Xing <kernelxing@...cent.com>,
Jens Axboe <axboe@...nel.dk>,
Pavel Begunkov <asml.silence@...il.com>,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-wpan@...r.kernel.org, bpf@...r.kernel.org
Subject: [PATCH v4 9/9] net: use new capable_any functionality
Use the new added capable_any function in appropriate cases, where a
task is required to have any of two capabilities.
Add sock_ns_capable_any() wrapper similar to existing sock_ns_capable()
one.
Reorder CAP_SYS_ADMIN last.
Signed-off-by: Christian Göttsche <cgzones@...glemail.com>
---
v4:
- introduce sockopt_ns_capable_any()
v3:
- rename to capable_any()
- make use of ns_capable_any
Signed-off-by: Christian Göttsche <cgzones@...glemail.com>
---
include/net/sock.h | 1 +
net/caif/caif_socket.c | 2 +-
net/core/sock.c | 18 ++++++++++--------
net/ieee802154/socket.c | 6 ++----
net/ipv4/ip_sockglue.c | 4 ++--
net/ipv6/ipv6_sockglue.c | 3 +--
net/unix/scm.c | 2 +-
7 files changed, 18 insertions(+), 18 deletions(-)
diff --git a/include/net/sock.h b/include/net/sock.h
index 8b7ed7167243..a17178e31e91 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -1762,6 +1762,7 @@ static inline void unlock_sock_fast(struct sock *sk, bool slow)
void sockopt_lock_sock(struct sock *sk);
void sockopt_release_sock(struct sock *sk);
bool sockopt_ns_capable(struct user_namespace *ns, int cap);
+bool sockopt_ns_capable_any(struct user_namespace *ns, int cap1, int cap2);
bool sockopt_capable(int cap);
/* Used by processes to "lock" a socket state, so that
diff --git a/net/caif/caif_socket.c b/net/caif/caif_socket.c
index 4eebcc66c19a..6dcc08f9da3b 100644
--- a/net/caif/caif_socket.c
+++ b/net/caif/caif_socket.c
@@ -1027,7 +1027,7 @@ static int caif_create(struct net *net, struct socket *sock, int protocol,
.usersize = sizeof_field(struct caifsock, conn_req.param)
};
- if (!capable(CAP_SYS_ADMIN) && !capable(CAP_NET_ADMIN))
+ if (!capable_any(CAP_NET_ADMIN, CAP_SYS_ADMIN))
return -EPERM;
/*
* The sock->type specifies the socket type to use.
diff --git a/net/core/sock.c b/net/core/sock.c
index 5440e67bcfe3..6a236d649bec 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1073,6 +1073,12 @@ bool sockopt_ns_capable(struct user_namespace *ns, int cap)
}
EXPORT_SYMBOL(sockopt_ns_capable);
+bool sockopt_ns_capable_any(struct user_namespace *ns, int cap1, int cap2)
+{
+ return has_current_bpf_ctx() || ns_capable_any(ns, cap1, cap2);
+}
+EXPORT_SYMBOL(sockopt_ns_capable_any);
+
bool sockopt_capable(int cap)
{
return has_current_bpf_ctx() || capable(cap);
@@ -1207,8 +1213,7 @@ int sk_setsockopt(struct sock *sk, int level, int optname,
case SO_PRIORITY:
if ((val >= 0 && val <= 6) ||
- sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) ||
- sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
+ sockopt_ns_capable_any(sock_net(sk)->user_ns, CAP_NET_RAW, CAP_NET_ADMIN))
sk->sk_priority = val;
else
ret = -EPERM;
@@ -1353,8 +1358,7 @@ int sk_setsockopt(struct sock *sk, int level, int optname,
clear_bit(SOCK_PASSSEC, &sock->flags);
break;
case SO_MARK:
- if (!sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) &&
- !sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
+ if (!sockopt_ns_capable_any(sock_net(sk)->user_ns, CAP_NET_RAW, CAP_NET_ADMIN)) {
ret = -EPERM;
break;
}
@@ -1362,8 +1366,7 @@ int sk_setsockopt(struct sock *sk, int level, int optname,
__sock_set_mark(sk, val);
break;
case SO_RCVMARK:
- if (!sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) &&
- !sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
+ if (!sockopt_ns_capable_any(sock_net(sk)->user_ns, CAP_NET_RAW, CAP_NET_ADMIN)) {
ret = -EPERM;
break;
}
@@ -2747,8 +2750,7 @@ int __sock_cmsg_send(struct sock *sk, struct cmsghdr *cmsg,
switch (cmsg->cmsg_type) {
case SO_MARK:
- if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) &&
- !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
+ if (!ns_capable_any(sock_net(sk)->user_ns, CAP_NET_RAW, CAP_NET_ADMIN))
return -EPERM;
if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
return -EINVAL;
diff --git a/net/ieee802154/socket.c b/net/ieee802154/socket.c
index 1fa2fe041ec0..f9bc6cae4af9 100644
--- a/net/ieee802154/socket.c
+++ b/net/ieee802154/socket.c
@@ -904,8 +904,7 @@ static int dgram_setsockopt(struct sock *sk, int level, int optname,
ro->want_lqi = !!val;
break;
case WPAN_SECURITY:
- if (!ns_capable(net->user_ns, CAP_NET_ADMIN) &&
- !ns_capable(net->user_ns, CAP_NET_RAW)) {
+ if (!ns_capable_any(net->user_ns, CAP_NET_ADMIN, CAP_NET_RAW)) {
err = -EPERM;
break;
}
@@ -928,8 +927,7 @@ static int dgram_setsockopt(struct sock *sk, int level, int optname,
}
break;
case WPAN_SECURITY_LEVEL:
- if (!ns_capable(net->user_ns, CAP_NET_ADMIN) &&
- !ns_capable(net->user_ns, CAP_NET_RAW)) {
+ if (!ns_capable_any(net->user_ns, CAP_NET_ADMIN, CAP_NET_RAW)) {
err = -EPERM;
break;
}
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index b511ff0adc0a..4dd752743b84 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -1341,8 +1341,8 @@ int do_ip_setsockopt(struct sock *sk, int level, int optname,
break;
case IP_TRANSPARENT:
- if (!!val && !sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) &&
- !sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
+ if (!!val && !sockopt_ns_capable_any(sock_net(sk)->user_ns, CAP_NET_RAW,
+ CAP_NET_ADMIN)) {
err = -EPERM;
break;
}
diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index ae818ff46224..38aad44547e4 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -625,8 +625,7 @@ int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
break;
case IPV6_TRANSPARENT:
- if (valbool && !sockopt_ns_capable(net->user_ns, CAP_NET_RAW) &&
- !sockopt_ns_capable(net->user_ns, CAP_NET_ADMIN)) {
+ if (valbool && !sockopt_ns_capable_any(net->user_ns, CAP_NET_RAW, CAP_NET_ADMIN)) {
retv = -EPERM;
break;
}
diff --git a/net/unix/scm.c b/net/unix/scm.c
index f9152881d77f..4d18187a5349 100644
--- a/net/unix/scm.c
+++ b/net/unix/scm.c
@@ -99,7 +99,7 @@ static inline bool too_many_unix_fds(struct task_struct *p)
struct user_struct *user = current_user();
if (unlikely(user->unix_inflight > task_rlimit(p, RLIMIT_NOFILE)))
- return !capable(CAP_SYS_RESOURCE) && !capable(CAP_SYS_ADMIN);
+ return !capable_any(CAP_SYS_RESOURCE, CAP_SYS_ADMIN);
return false;
}
--
2.40.1
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