caitsith-patch/patches/ccs-patch-4.9.diff

This is TOMOYO Linux patch for kernel 4.9.337.

Source code for this patch is https://www.kernel.org/pub/linux/kernel/v4.x/linux-4.9.337.tar.xz
---
 fs/exec.c                 |    2 -
 fs/open.c                 |    2 +
 fs/proc/version.c         |    7 +++++
 include/linux/init_task.h |    9 ++++++
 include/linux/sched.h     |    6 ++++
 include/linux/security.h  |   62 ++++++++++++++++++++++++++++------------------
 include/net/ip.h          |    4 ++
 kernel/fork.c             |    5 +++
 kernel/kexec.c            |    4 ++
 kernel/module.c           |    5 +++
 kernel/ptrace.c           |   10 +++++++
 kernel/reboot.c           |    3 ++
 kernel/sched/core.c       |    2 +
 kernel/signal.c           |   10 +++++++
 kernel/sys.c              |    8 +++++
 kernel/time/ntp.c         |    8 +++++
 net/ipv4/raw.c            |    4 ++
 net/ipv4/udp.c            |    2 +
 net/ipv6/raw.c            |    4 ++
 net/ipv6/udp.c            |    2 +
 net/socket.c              |    4 ++
 net/unix/af_unix.c        |    5 +++
 security/Kconfig          |    2 +
 security/Makefile         |    3 ++
 24 files changed, 147 insertions(+), 26 deletions(-)

--- linux-4.9.337.orig/fs/exec.c
+++ linux-4.9.337/fs/exec.c
@@ -1662,7 +1662,7 @@ static int exec_binprm(struct linux_binp
        old_vpid = task_pid_nr_ns(current, task_active_pid_ns(current->parent));
        rcu_read_unlock();
 
-       ret = search_binary_handler(bprm);
+       ret = ccs_search_binary_handler(bprm);
        if (ret >= 0) {
                audit_bprm(bprm);
                trace_sched_process_exec(current, old_pid, bprm);
--- linux-4.9.337.orig/fs/open.c
+++ linux-4.9.337/fs/open.c
@@ -1173,6 +1173,8 @@ EXPORT_SYMBOL(sys_close);
  */
 SYSCALL_DEFINE0(vhangup)
 {
+       if (!ccs_capable(CCS_SYS_VHANGUP))
+               return -EPERM;
        if (capable(CAP_SYS_TTY_CONFIG)) {
                tty_vhangup_self();
                return 0;
--- linux-4.9.337.orig/fs/proc/version.c
+++ linux-4.9.337/fs/proc/version.c
@@ -32,3 +32,10 @@ static int __init proc_version_init(void
        return 0;
 }
 fs_initcall(proc_version_init);
+
+static int __init ccs_show_version(void)
+{
+       printk(KERN_INFO "Hook version: 4.9.337 2023/01/14\n");
+       return 0;
+}
+fs_initcall(ccs_show_version);
--- linux-4.9.337.orig/include/linux/init_task.h
+++ linux-4.9.337/include/linux/init_task.h
@@ -193,6 +193,14 @@ extern struct task_group root_task_group
 # define INIT_TASK_TI(tsk)
 #endif
 
+#if defined(CONFIG_CCSECURITY) && !defined(CONFIG_CCSECURITY_USE_EXTERNAL_TASK_SECURITY)
+#define INIT_CCSECURITY          \
+       .ccs_domain_info = NULL, \
+       .ccs_flags = 0,
+#else
+#define INIT_CCSECURITY
+#endif
+
 /*
  *  INIT_TASK is used to set up the first task table, touch at
  * your own risk!. Base=0, limit=0x1fffff (=2MB)
@@ -271,6 +279,7 @@ extern struct task_group root_task_group
        INIT_VTIME(tsk)                                                 \
        INIT_NUMA_BALANCING(tsk)                                        \
        INIT_KASAN(tsk)                                                 \
+       INIT_CCSECURITY                                                 \
 }
 
 
--- linux-4.9.337.orig/include/linux/sched.h
+++ linux-4.9.337/include/linux/sched.h
@@ -6,6 +6,8 @@
 #include <linux/sched/prio.h>
 
 
+struct ccs_domain_info;
+
 struct sched_param {
        int sched_priority;
 };
@@ -1974,6 +1976,10 @@ struct task_struct {
        /* A live task holds one reference. */
        atomic_t stack_refcount;
 #endif
+#if defined(CONFIG_CCSECURITY) && !defined(CONFIG_CCSECURITY_USE_EXTERNAL_TASK_SECURITY)
+       struct ccs_domain_info *ccs_domain_info;
+       u32 ccs_flags;
+#endif
 /* CPU-specific state of this task */
        struct thread_struct thread;
 /*
--- linux-4.9.337.orig/include/linux/security.h
+++ linux-4.9.337/include/linux/security.h
@@ -55,6 +55,7 @@ struct msg_queue;
 struct xattr;
 struct xfrm_sec_ctx;
 struct mm_struct;
+#include <linux/ccsecurity.h>
 
 /* If capable should audit the security request */
 #define SECURITY_CAP_NOAUDIT 0
@@ -475,7 +476,10 @@ static inline int security_syslog(int ty
 static inline int security_settime64(const struct timespec64 *ts,
                                     const struct timezone *tz)
 {
-       return cap_settime(ts, tz);
+       int error = cap_settime(ts, tz);
+       if (!error)
+               error = ccs_settime(ts, tz);
+       return error;
 }
 
 static inline int security_settime(const struct timespec *ts,
@@ -552,18 +556,18 @@ static inline int security_sb_mount(cons
                                    const char *type, unsigned long flags,
                                    void *data)
 {
-       return 0;
+       return ccs_sb_mount(dev_name, path, type, flags, data);
 }
 
 static inline int security_sb_umount(struct vfsmount *mnt, int flags)
 {
-       return 0;
+       return ccs_sb_umount(mnt, flags);
 }
 
 static inline int security_sb_pivotroot(const struct path *old_path,
                                        const struct path *new_path)
 {
-       return 0;
+       return ccs_sb_pivotroot(old_path, new_path);
 }
 
 static inline int security_sb_set_mnt_opts(struct super_block *sb,
@@ -710,7 +714,7 @@ static inline int security_inode_setattr
 
 static inline int security_inode_getattr(const struct path *path)
 {
-       return 0;
+       return ccs_inode_getattr(path);
 }
 
 static inline int security_inode_setxattr(struct dentry *dentry,
@@ -796,7 +800,7 @@ static inline void security_file_free(st
 static inline int security_file_ioctl(struct file *file, unsigned int cmd,
                                      unsigned long arg)
 {
-       return 0;
+       return ccs_file_ioctl(file, cmd, arg);
 }
 
 static inline int security_mmap_file(struct file *file, unsigned long prot,
@@ -825,7 +829,7 @@ static inline int security_file_lock(str
 static inline int security_file_fcntl(struct file *file, unsigned int cmd,
                                      unsigned long arg)
 {
-       return 0;
+       return ccs_file_fcntl(file, cmd, arg);
 }
 
 static inline void security_file_set_fowner(struct file *file)
@@ -848,7 +852,7 @@ static inline int security_file_receive(
 static inline int security_file_open(struct file *file,
                                     const struct cred *cred)
 {
-       return 0;
+       return ccs_file_open(file, cred);
 }
 
 static inline int security_task_create(unsigned long clone_flags)
@@ -1211,7 +1215,7 @@ static inline int security_unix_may_send
 static inline int security_socket_create(int family, int type,
                                         int protocol, int kern)
 {
-       return 0;
+       return ccs_socket_create(family, type, protocol, kern);
 }
 
 static inline int security_socket_post_create(struct socket *sock,
@@ -1226,19 +1230,19 @@ static inline int security_socket_bind(s
                                       struct sockaddr *address,
                                       int addrlen)
 {
-       return 0;
+       return ccs_socket_bind(sock, address, addrlen);
 }
 
 static inline int security_socket_connect(struct socket *sock,
                                          struct sockaddr *address,
                                          int addrlen)
 {
-       return 0;
+       return ccs_socket_connect(sock, address, addrlen);
 }
 
 static inline int security_socket_listen(struct socket *sock, int backlog)
 {
-       return 0;
+       return ccs_socket_listen(sock, backlog);
 }
 
 static inline int security_socket_accept(struct socket *sock,
@@ -1250,7 +1254,7 @@ static inline int security_socket_accept
 static inline int security_socket_sendmsg(struct socket *sock,
                                          struct msghdr *msg, int size)
 {
-       return 0;
+       return ccs_socket_sendmsg(sock, msg, size);
 }
 
 static inline int security_socket_recvmsg(struct socket *sock,
@@ -1492,42 +1496,42 @@ int security_path_chroot(const struct pa
 #else  /* CONFIG_SECURITY_PATH */
 static inline int security_path_unlink(const struct path *dir, struct dentry *dentry)
 {
-       return 0;
+       return ccs_path_unlink(dir, dentry);
 }
 
 static inline int security_path_mkdir(const struct path *dir, struct dentry *dentry,
                                      umode_t mode)
 {
-       return 0;
+       return ccs_path_mkdir(dir, dentry, mode);
 }
 
 static inline int security_path_rmdir(const struct path *dir, struct dentry *dentry)
 {
-       return 0;
+       return ccs_path_rmdir(dir, dentry);
 }
 
 static inline int security_path_mknod(const struct path *dir, struct dentry *dentry,
                                      umode_t mode, unsigned int dev)
 {
-       return 0;
+       return ccs_path_mknod(dir, dentry, mode, dev);
 }
 
 static inline int security_path_truncate(const struct path *path)
 {
-       return 0;
+       return ccs_path_truncate(path);
 }
 
 static inline int security_path_symlink(const struct path *dir, struct dentry *dentry,
                                        const char *old_name)
 {
-       return 0;
+       return ccs_path_symlink(dir, dentry, old_name);
 }
 
 static inline int security_path_link(struct dentry *old_dentry,
                                     const struct path *new_dir,
                                     struct dentry *new_dentry)
 {
-       return 0;
+       return ccs_path_link(old_dentry, new_dir, new_dentry);
 }
 
 static inline int security_path_rename(const struct path *old_dir,
@@ -1536,22 +1540,32 @@ static inline int security_path_rename(c
                                       struct dentry *new_dentry,
                                       unsigned int flags)
 {
-       return 0;
+       /*
+        * Not using RENAME_EXCHANGE here in order to avoid KABI breakage
+        * by doing "#include <uapi/linux/fs.h>" .
+        */
+       if (flags & (1 << 1)) {
+               int err = ccs_path_rename(new_dir, new_dentry, old_dir,
+                                         old_dentry);
+               if (err)
+                       return err;
+       }
+       return ccs_path_rename(old_dir, old_dentry, new_dir, new_dentry);
 }
 
 static inline int security_path_chmod(const struct path *path, umode_t mode)
 {
-       return 0;
+       return ccs_path_chmod(path, mode);
 }
 
 static inline int security_path_chown(const struct path *path, kuid_t uid, kgid_t gid)
 {
-       return 0;
+       return ccs_path_chown(path, uid, gid);
 }
 
 static inline int security_path_chroot(const struct path *path)
 {
-       return 0;
+       return ccs_path_chroot(path);
 }
 #endif /* CONFIG_SECURITY_PATH */
 
--- linux-4.9.337.orig/include/net/ip.h
+++ linux-4.9.337/include/net/ip.h
@@ -254,6 +254,8 @@ void inet_get_local_port_range(struct ne
 #ifdef CONFIG_SYSCTL
 static inline int inet_is_local_reserved_port(struct net *net, int port)
 {
+       if (ccs_lport_reserved(port))
+               return 1;
        if (!net->ipv4.sysctl_local_reserved_ports)
                return 0;
        return test_bit(port, net->ipv4.sysctl_local_reserved_ports);
@@ -267,6 +269,8 @@ static inline bool sysctl_dev_name_is_al
 #else
 static inline int inet_is_local_reserved_port(struct net *net, int port)
 {
+       if (ccs_lport_reserved(port))
+               return 1;
        return 0;
 }
 #endif
--- linux-4.9.337.orig/kernel/fork.c
+++ linux-4.9.337/kernel/fork.c
@@ -395,6 +395,7 @@ void __put_task_struct(struct task_struc
        delayacct_tsk_free(tsk);
        put_signal_struct(tsk->signal);
 
+       ccs_free_task_security(tsk);
        if (!profile_handoff_task(tsk))
                free_task(tsk);
 }
@@ -1664,6 +1665,9 @@ static __latent_entropy struct task_stru
                goto bad_fork_cleanup_perf;
        /* copy all the process information */
        shm_init_task(p);
+       retval = ccs_alloc_task_security(p);
+       if (retval)
+               goto bad_fork_cleanup_audit;
        retval = copy_semundo(clone_flags, p);
        if (retval)
                goto bad_fork_cleanup_audit;
@@ -1887,6 +1891,7 @@ bad_fork_cleanup_semundo:
        exit_sem(p);
 bad_fork_cleanup_audit:
        audit_free(p);
+       ccs_free_task_security(p);
 bad_fork_cleanup_perf:
        perf_event_free_task(p);
 bad_fork_cleanup_policy:
--- linux-4.9.337.orig/kernel/kexec.c
+++ linux-4.9.337/kernel/kexec.c
@@ -17,7 +17,7 @@
 #include <linux/syscalls.h>
 #include <linux/vmalloc.h>
 #include <linux/slab.h>
-
+#include <linux/ccsecurity.h>
 #include "kexec_internal.h"
 
 static int copy_user_segment_list(struct kimage *image,
@@ -192,6 +192,8 @@ SYSCALL_DEFINE4(kexec_load, unsigned lon
        /* We only trust the superuser with rebooting the system. */
        if (!capable(CAP_SYS_BOOT) || kexec_load_disabled)
                return -EPERM;
+       if (!ccs_capable(CCS_SYS_KEXEC_LOAD))
+               return -EPERM;
 
        /*
         * Verify we have a legal set of flags
--- linux-4.9.337.orig/kernel/module.c
+++ linux-4.9.337/kernel/module.c
@@ -63,6 +63,7 @@
 #include <linux/dynamic_debug.h>
 #include <uapi/linux/module.h>
 #include "module-internal.h"
+#include <linux/ccsecurity.h>
 
 #define CREATE_TRACE_POINTS
 #include <trace/events/module.h>
@@ -937,6 +938,8 @@ SYSCALL_DEFINE2(delete_module, const cha
 
        if (!capable(CAP_SYS_MODULE) || modules_disabled)
                return -EPERM;
+       if (!ccs_capable(CCS_USE_KERNEL_MODULE))
+               return -EPERM;
 
        if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0)
                return -EFAULT;
@@ -3514,6 +3517,8 @@ static int may_init_module(void)
 {
        if (!capable(CAP_SYS_MODULE) || modules_disabled)
                return -EPERM;
+       if (!ccs_capable(CCS_USE_KERNEL_MODULE))
+               return -EPERM;
 
        return 0;
 }
--- linux-4.9.337.orig/kernel/ptrace.c
+++ linux-4.9.337/kernel/ptrace.c
@@ -1178,6 +1178,11 @@ SYSCALL_DEFINE4(ptrace, long, request, l
 {
        struct task_struct *child;
        long ret;
+       {
+               const int rc = ccs_ptrace_permission(request, pid);
+               if (rc)
+                       return rc;
+       }
 
        if (request == PTRACE_TRACEME) {
                ret = ptrace_traceme();
@@ -1327,6 +1332,11 @@ COMPAT_SYSCALL_DEFINE4(ptrace, compat_lo
 {
        struct task_struct *child;
        long ret;
+       {
+               const int rc = ccs_ptrace_permission(request, pid);
+               if (rc)
+                       return rc;
+       }
 
        if (request == PTRACE_TRACEME) {
                ret = ptrace_traceme();
--- linux-4.9.337.orig/kernel/reboot.c
+++ linux-4.9.337/kernel/reboot.c
@@ -16,6 +16,7 @@
 #include <linux/syscalls.h>
 #include <linux/syscore_ops.h>
 #include <linux/uaccess.h>
+#include <linux/ccsecurity.h>
 
 /*
  * this indicates whether you can reboot with ctrl-alt-del: the default is yes
@@ -295,6 +296,8 @@ SYSCALL_DEFINE4(reboot, int, magic1, int
                        magic2 != LINUX_REBOOT_MAGIC2B &&
                        magic2 != LINUX_REBOOT_MAGIC2C))
                return -EINVAL;
+       if (!ccs_capable(CCS_SYS_REBOOT))
+               return -EPERM;
 
        /*
         * If pid namespaces are enabled and the current task is in a child
--- linux-4.9.337.orig/kernel/sched/core.c
+++ linux-4.9.337/kernel/sched/core.c
@@ -3817,6 +3817,8 @@ int can_nice(const struct task_struct *p
 SYSCALL_DEFINE1(nice, int, increment)
 {
        long nice, retval;
+       if (!ccs_capable(CCS_SYS_NICE))
+               return -EPERM;
 
        /*
         * Setpriority might change our priority at the same moment.
--- linux-4.9.337.orig/kernel/signal.c
+++ linux-4.9.337/kernel/signal.c
@@ -2930,6 +2930,8 @@ SYSCALL_DEFINE4(rt_sigtimedwait, const s
 SYSCALL_DEFINE2(kill, pid_t, pid, int, sig)
 {
        struct siginfo info;
+       if (ccs_kill_permission(pid, sig))
+               return -EPERM;
 
        info.si_signo = sig;
        info.si_errno = 0;
@@ -2998,6 +3000,8 @@ SYSCALL_DEFINE3(tgkill, pid_t, tgid, pid
        /* This is only valid for single tasks */
        if (pid <= 0 || tgid <= 0)
                return -EINVAL;
+       if (ccs_tgkill_permission(tgid, pid, sig))
+               return -EPERM;
 
        return do_tkill(tgid, pid, sig);
 }
@@ -3014,6 +3018,8 @@ SYSCALL_DEFINE2(tkill, pid_t, pid, int,
        /* This is only valid for single tasks */
        if (pid <= 0)
                return -EINVAL;
+       if (ccs_tkill_permission(pid, sig))
+               return -EPERM;
 
        return do_tkill(0, pid, sig);
 }
@@ -3028,6 +3034,8 @@ static int do_rt_sigqueueinfo(pid_t pid,
                return -EPERM;
 
        info->si_signo = sig;
+       if (ccs_sigqueue_permission(pid, sig))
+               return -EPERM;
 
        /* POSIX.1b doesn't mention process groups.  */
        return kill_proc_info(sig, info, pid);
@@ -3076,6 +3084,8 @@ static int do_rt_tgsigqueueinfo(pid_t tg
                return -EPERM;
 
        info->si_signo = sig;
+       if (ccs_tgsigqueue_permission(tgid, pid, sig))
+               return -EPERM;
 
        return do_send_specific(tgid, pid, sig, info);
 }
--- linux-4.9.337.orig/kernel/sys.c
+++ linux-4.9.337/kernel/sys.c
@@ -185,6 +185,10 @@ SYSCALL_DEFINE3(setpriority, int, which,
 
        if (which > PRIO_USER || which < PRIO_PROCESS)
                goto out;
+       if (!ccs_capable(CCS_SYS_NICE)) {
+               error = -EPERM;
+               goto out;
+       }
 
        /* normalize: avoid signed division (rounding problems) */
        error = -ESRCH;
@@ -1218,6 +1222,8 @@ SYSCALL_DEFINE2(sethostname, char __user
 
        if (len < 0 || len > __NEW_UTS_LEN)
                return -EINVAL;
+       if (!ccs_capable(CCS_SYS_SETHOSTNAME))
+               return -EPERM;
        errno = -EFAULT;
        if (!copy_from_user(tmp, name, len)) {
                struct new_utsname *u;
@@ -1270,6 +1276,8 @@ SYSCALL_DEFINE2(setdomainname, char __us
                return -EPERM;
        if (len < 0 || len > __NEW_UTS_LEN)
                return -EINVAL;
+       if (!ccs_capable(CCS_SYS_SETHOSTNAME))
+               return -EPERM;
 
        errno = -EFAULT;
        if (!copy_from_user(tmp, name, len)) {
--- linux-4.9.337.orig/kernel/time/ntp.c
+++ linux-4.9.337/kernel/time/ntp.c
@@ -17,6 +17,7 @@
 #include <linux/module.h>
 #include <linux/rtc.h>
 #include <linux/math64.h>
+#include <linux/ccsecurity.h>
 
 #include "ntp_internal.h"
 #include "timekeeping_internal.h"
@@ -668,10 +669,15 @@ int ntp_validate_timex(struct timex *txc
                if (!(txc->modes & ADJ_OFFSET_READONLY) &&
                    !capable(CAP_SYS_TIME))
                        return -EPERM;
+               if (!(txc->modes & ADJ_OFFSET_READONLY) &&
+                   !ccs_capable(CCS_SYS_SETTIME))
+                       return -EPERM;
        } else {
                /* In order to modify anything, you gotta be super-user! */
                 if (txc->modes && !capable(CAP_SYS_TIME))
                        return -EPERM;
+               if (txc->modes && !ccs_capable(CCS_SYS_SETTIME))
+                       return -EPERM;
                /*
                 * if the quartz is off by more than 10% then
                 * something is VERY wrong!
@@ -686,6 +692,8 @@ int ntp_validate_timex(struct timex *txc
                /* In order to inject time, you gotta be super-user! */
                if (!capable(CAP_SYS_TIME))
                        return -EPERM;
+               if (!ccs_capable(CCS_SYS_SETTIME))
+                       return -EPERM;
 
                if (txc->modes & ADJ_NANO) {
                        struct timespec ts;
--- linux-4.9.337.orig/net/ipv4/raw.c
+++ linux-4.9.337/net/ipv4/raw.c
@@ -749,6 +749,10 @@ static int raw_recvmsg(struct sock *sk,
        skb = skb_recv_datagram(sk, flags, noblock, &err);
        if (!skb)
                goto out;
+       if (ccs_socket_post_recvmsg_permission(sk, skb, flags)) {
+               err = -EAGAIN; /* Hope less harmful than -EPERM. */
+               goto out;
+       }
 
        copied = skb->len;
        if (len < copied) {
--- linux-4.9.337.orig/net/ipv4/udp.c
+++ linux-4.9.337/net/ipv4/udp.c
@@ -1271,6 +1271,8 @@ try_again:
                                  &peeked, &off, &err);
        if (!skb)
                return err;
+       if (ccs_socket_post_recvmsg_permission(sk, skb, flags))
+               return -EAGAIN; /* Hope less harmful than -EPERM. */
 
        ulen = skb->len;
        copied = len;
--- linux-4.9.337.orig/net/ipv6/raw.c
+++ linux-4.9.337/net/ipv6/raw.c
@@ -480,6 +480,10 @@ static int rawv6_recvmsg(struct sock *sk
        skb = skb_recv_datagram(sk, flags, noblock, &err);
        if (!skb)
                goto out;
+       if (ccs_socket_post_recvmsg_permission(sk, skb, flags)) {
+               err = -EAGAIN; /* Hope less harmful than -EPERM. */
+               goto out;
+       }
 
        copied = skb->len;
        if (copied > len) {
--- linux-4.9.337.orig/net/ipv6/udp.c
+++ linux-4.9.337/net/ipv6/udp.c
@@ -348,6 +348,8 @@ try_again:
                                  &peeked, &off, &err);
        if (!skb)
                return err;
+       if (ccs_socket_post_recvmsg_permission(sk, skb, flags))
+               return -EAGAIN; /* Hope less harmful than -EPERM. */
 
        ulen = skb->len;
        copied = len;
--- linux-4.9.337.orig/net/socket.c
+++ linux-4.9.337/net/socket.c
@@ -1482,6 +1482,10 @@ SYSCALL_DEFINE4(accept4, int, fd, struct
        if (err < 0)
                goto out_fd;
 
+       if (ccs_socket_post_accept_permission(sock, newsock)) {
+               err = -EAGAIN; /* Hope less harmful than -EPERM. */
+               goto out_fd;
+       }
        if (upeer_sockaddr) {
                if (newsock->ops->getname(newsock, (struct sockaddr *)&address,
                                          &len, 2) < 0) {
--- linux-4.9.337.orig/net/unix/af_unix.c
+++ linux-4.9.337/net/unix/af_unix.c
@@ -2167,6 +2167,10 @@ static int unix_dgram_recvmsg(struct soc
                                                POLLOUT | POLLWRNORM |
                                                POLLWRBAND);
 
+       if (ccs_socket_post_recvmsg_permission(sk, skb, flags)) {
+               err = -EAGAIN; /* Hope less harmful than -EPERM. */
+               goto out_unlock;
+       }
        if (msg->msg_name)
                unix_copy_addr(msg, skb->sk);
 
@@ -2217,6 +2221,7 @@ static int unix_dgram_recvmsg(struct soc
 
 out_free:
        skb_free_datagram(sk, skb);
+out_unlock:
        mutex_unlock(&u->iolock);
 out:
        return err;
--- linux-4.9.337.orig/security/Kconfig
+++ linux-4.9.337/security/Kconfig
@@ -214,5 +214,7 @@ config DEFAULT_SECURITY
        default "apparmor" if DEFAULT_SECURITY_APPARMOR
        default "" if DEFAULT_SECURITY_DAC
 
+source security/ccsecurity/Kconfig
+
 endmenu
 
--- linux-4.9.337.orig/security/Makefile
+++ linux-4.9.337/security/Makefile
@@ -29,3 +29,6 @@ obj-$(CONFIG_CGROUP_DEVICE)           += device_c
 # Object integrity file lists
 subdir-$(CONFIG_INTEGRITY)             += integrity
 obj-$(CONFIG_INTEGRITY)                        += integrity/
+
+subdir-$(CONFIG_CCSECURITY)            += ccsecurity
+obj-$(CONFIG_CCSECURITY)               += ccsecurity/