Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 188 insertions, 0 deletions

diff --git a/tools/testing/selftests/bpf/progs/lsm_cgroup.c b/tools/testing/selftests/bpf/progs/lsm_cgroup.c
new file mode 100644
index 000000000..02c11d16b
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/lsm_cgroup.c
@@ -0,0 +1,188 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include "vmlinux.h"
+#include "bpf_tracing_net.h"
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+
+char _license[] SEC("license") = "GPL";
+
+extern bool CONFIG_SECURITY_SELINUX __kconfig __weak;
+extern bool CONFIG_SECURITY_SMACK __kconfig __weak;
+extern bool CONFIG_SECURITY_APPARMOR __kconfig __weak;
+
+#ifndef AF_PACKET
+#define AF_PACKET 17
+#endif
+
+#ifndef AF_UNIX
+#define AF_UNIX 1
+#endif
+
+#ifndef EPERM
+#define EPERM 1
+#endif
+
+struct {
+	__uint(type, BPF_MAP_TYPE_CGROUP_STORAGE);
+	__type(key, __u64);
+	__type(value, __u64);
+} cgroup_storage SEC(".maps");
+
+int called_socket_post_create;
+int called_socket_post_create2;
+int called_socket_bind;
+int called_socket_bind2;
+int called_socket_alloc;
+int called_socket_clone;
+
+static __always_inline int test_local_storage(void)
+{
+	__u64 *val;
+
+	val = bpf_get_local_storage(&cgroup_storage, 0);
+	if (!val)
+		return 0;
+	*val += 1;
+
+	return 1;
+}
+
+static __always_inline int real_create(struct socket *sock, int family,
+				       int protocol)
+{
+	struct sock *sk;
+	int prio = 123;
+
+	/* Reject non-tx-only AF_PACKET. */
+	if (family == AF_PACKET && protocol != 0)
+		return 0; /* EPERM */
+
+	sk = sock->sk;
+	if (!sk)
+		return 1;
+
+	/* The rest of the sockets get default policy. */
+	if (bpf_setsockopt(sk, SOL_SOCKET, SO_PRIORITY, &prio, sizeof(prio)))
+		return 0; /* EPERM */
+
+	/* Make sure bpf_getsockopt is allowed and works. */
+	prio = 0;
+	if (bpf_getsockopt(sk, SOL_SOCKET, SO_PRIORITY, &prio, sizeof(prio)))
+		return 0; /* EPERM */
+	if (prio != 123)
+		return 0; /* EPERM */
+
+	/* Can access cgroup local storage. */
+	if (!test_local_storage())
+		return 0; /* EPERM */
+
+	return 1;
+}
+
+/* __cgroup_bpf_run_lsm_socket */
+SEC("lsm_cgroup/socket_post_create")
+int BPF_PROG(socket_post_create, struct socket *sock, int family,
+	     int type, int protocol, int kern)
+{
+	called_socket_post_create++;
+	return real_create(sock, family, protocol);
+}
+
+/* __cgroup_bpf_run_lsm_socket */
+SEC("lsm_cgroup/socket_post_create")
+int BPF_PROG(socket_post_create2, struct socket *sock, int family,
+	     int type, int protocol, int kern)
+{
+	called_socket_post_create2++;
+	return real_create(sock, family, protocol);
+}
+
+static __always_inline int real_bind(struct socket *sock,
+				     struct sockaddr *address,
+				     int addrlen)
+{
+	struct sockaddr_ll sa = {};
+
+	if (sock->sk->__sk_common.skc_family != AF_PACKET)
+		return 1;
+
+	if (sock->sk->sk_kern_sock)
+		return 1;
+
+	bpf_probe_read_kernel(&sa, sizeof(sa), address);
+	if (sa.sll_protocol)
+		return 0; /* EPERM */
+
+	/* Can access cgroup local storage. */
+	if (!test_local_storage())
+		return 0; /* EPERM */
+
+	return 1;
+}
+
+/* __cgroup_bpf_run_lsm_socket */
+SEC("lsm_cgroup/socket_bind")
+int BPF_PROG(socket_bind, struct socket *sock, struct sockaddr *address,
+	     int addrlen)
+{
+	called_socket_bind++;
+	return real_bind(sock, address, addrlen);
+}
+
+/* __cgroup_bpf_run_lsm_socket */
+SEC("lsm_cgroup/socket_bind")
+int BPF_PROG(socket_bind2, struct socket *sock, struct sockaddr *address,
+	     int addrlen)
+{
+	called_socket_bind2++;
+	return real_bind(sock, address, addrlen);
+}
+
+/* __cgroup_bpf_run_lsm_current (via bpf_lsm_current_hooks) */
+SEC("lsm_cgroup/sk_alloc_security")
+int BPF_PROG(socket_alloc, struct sock *sk, int family, gfp_t priority)
+{
+	called_socket_alloc++;
+	/* if already have non-bpf lsms installed, EPERM will cause memory leak of non-bpf lsms */
+	if (CONFIG_SECURITY_SELINUX || CONFIG_SECURITY_SMACK || CONFIG_SECURITY_APPARMOR)
+		return 1;
+
+	if (family == AF_UNIX)
+		return 0; /* EPERM */
+
+	/* Can access cgroup local storage. */
+	if (!test_local_storage())
+		return 0; /* EPERM */
+
+	return 1;
+}
+
+/* __cgroup_bpf_run_lsm_sock */
+SEC("lsm_cgroup/inet_csk_clone")
+int BPF_PROG(socket_clone, struct sock *newsk, const struct request_sock *req)
+{
+	int prio = 234;
+
+	if (!newsk)
+		return 1;
+
+	/* Accepted request sockets get a different priority. */
+	if (bpf_setsockopt(newsk, SOL_SOCKET, SO_PRIORITY, &prio, sizeof(prio)))
+		return 1;
+
+	/* Make sure bpf_getsockopt is allowed and works. */
+	prio = 0;
+	if (bpf_getsockopt(newsk, SOL_SOCKET, SO_PRIORITY, &prio, sizeof(prio)))
+		return 1;
+	if (prio != 234)
+		return 1;
+
+	/* Can access cgroup local storage. */
+	if (!test_local_storage())
+		return 1;
+
+	called_socket_clone++;
+
+	return 1;
+}