1 files changed, 112 insertions, 49 deletions

diff --git a/kernel/fork.c b/kernel/fork.c
index 8b20ab7d3aa2..65ca6d27f24e 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -146,7 +146,7 @@ void __weak arch_release_thread_info(struct thread_info *ti)
 static struct thread_info *alloc_thread_info_node(struct task_struct *tsk,
                                                   int node)
 {
-        struct page *page = alloc_pages_node(node, THREADINFO_GFP,
+        struct page *page = alloc_pages_node(node, THREADINFO_GFP_ACCOUNTED,
                                              THREAD_SIZE_ORDER);
 
         return page ? page_address(page) : NULL;
@@ -154,7 +154,7 @@ static struct thread_info *alloc_thread_info_node(struct task_struct *tsk,
 
 static inline void free_thread_info(struct thread_info *ti)
 {
-        free_pages((unsigned long)ti, THREAD_SIZE_ORDER);
+        free_memcg_kmem_pages((unsigned long)ti, THREAD_SIZE_ORDER);
 }
 # else
 static struct kmem_cache *thread_info_cache;
@@ -352,6 +352,7 @@ static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
         unsigned long charge;
         struct mempolicy *pol;
 
+        uprobe_start_dup_mmap();
         down_write(&oldmm->mmap_sem);
         flush_cache_dup_mm(oldmm);
         uprobe_dup_mmap(oldmm, mm);
@@ -469,6 +470,7 @@ out:
         up_write(&mm->mmap_sem);
         flush_tlb_mm(oldmm);
         up_write(&oldmm->mmap_sem);
+        uprobe_end_dup_mmap();
         return retval;
 fail_nomem_anon_vma_fork:
         mpol_put(pol);
@@ -821,6 +823,9 @@ struct mm_struct *dup_mm(struct task_struct *tsk)
 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
         mm->pmd_huge_pte = NULL;
 #endif
+#ifdef CONFIG_NUMA_BALANCING
+        mm->first_nid = NUMA_PTE_SCAN_INIT;
+#endif
         if (!mm_init(mm, tsk))
                 goto fail_nomem;
 
@@ -1039,8 +1044,6 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
         atomic_set(&sig->live, 1);
         atomic_set(&sig->sigcnt, 1);
         init_waitqueue_head(&sig->wait_chldexit);
-        if (clone_flags & CLONE_NEWPID)
-                sig->flags |= SIGNAL_UNKILLABLE;
         sig->curr_target = tsk;
         init_sigpending(&sig->shared_pending);
         INIT_LIST_HEAD(&sig->posix_timers);
@@ -1127,7 +1130,6 @@ static void posix_cpu_timers_init(struct task_struct *tsk)
  */
 static struct task_struct *copy_process(unsigned long clone_flags,
                                         unsigned long stack_start,
-                                        struct pt_regs *regs,
                                         unsigned long stack_size,
                                         int __user *child_tidptr,
                                         struct pid *pid,
@@ -1135,7 +1137,6 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 {
         int retval;
         struct task_struct *p;
-        int cgroup_callbacks_done = 0;
 
         if ((clone_flags & (CLONE_NEWNS|CLONE_FS)) == (CLONE_NEWNS|CLONE_FS))
                 return ERR_PTR(-EINVAL);
@@ -1165,6 +1166,14 @@ static struct task_struct *copy_process(unsigned long clone_flags,
                                 current->signal->flags & SIGNAL_UNKILLABLE)
                 return ERR_PTR(-EINVAL);
 
+        /*
+         * If the new process will be in a different pid namespace
+         * don't allow the creation of threads.
+         */
+        if ((clone_flags & (CLONE_VM|CLONE_NEWPID)) &&
+            (task_active_pid_ns(current) != current->nsproxy->pid_ns))
+                return ERR_PTR(-EINVAL);
+
         retval = security_task_create(clone_flags);
         if (retval)
                 goto fork_out;
@@ -1222,7 +1231,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
         p->utime = p->stime = p->gtime = 0;
         p->utimescaled = p->stimescaled = 0;
 #ifndef CONFIG_VIRT_CPU_ACCOUNTING
-        p->prev_utime = p->prev_stime = 0;
+        p->prev_cputime.utime = p->prev_cputime.stime = 0;
 #endif
 #if defined(SPLIT_RSS_COUNTING)
         memset(&p->rss_stat, 0, sizeof(p->rss_stat));
@@ -1320,7 +1329,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
         retval = copy_io(clone_flags, p);
         if (retval)
                 goto bad_fork_cleanup_namespaces;
-        retval = copy_thread(clone_flags, stack_start, stack_size, p, regs);
+        retval = copy_thread(clone_flags, stack_start, stack_size, p);
         if (retval)
                 goto bad_fork_cleanup_io;
 
@@ -1393,12 +1402,6 @@ static struct task_struct *copy_process(unsigned long clone_flags,
         INIT_LIST_HEAD(&p->thread_group);
         p->task_works = NULL;
 
-        /* Now that the task is set up, run cgroup callbacks if
-         * necessary. We need to run them before the task is visible
-         * on the tasklist. */
-        cgroup_fork_callbacks(p);
-        cgroup_callbacks_done = 1;
-
         /* Need tasklist lock for parent etc handling! */
         write_lock_irq(&tasklist_lock);
 
@@ -1441,8 +1444,10 @@ static struct task_struct *copy_process(unsigned long clone_flags,
                 ptrace_init_task(p, (clone_flags & CLONE_PTRACE) || trace);
 
                 if (thread_group_leader(p)) {
-                        if (is_child_reaper(pid))
-                                p->nsproxy->pid_ns->child_reaper = p;
+                        if (is_child_reaper(pid)) {
+                                ns_of_pid(pid)->child_reaper = p;
+                                p->signal->flags |= SIGNAL_UNKILLABLE;
+                        }
 
                         p->signal->leader_pid = pid;
                         p->signal->tty = tty_kref_get(current->signal->tty);
@@ -1476,8 +1481,6 @@ bad_fork_cleanup_io:
         if (p->io_context)
                 exit_io_context(p);
 bad_fork_cleanup_namespaces:
-        if (unlikely(clone_flags & CLONE_NEWPID))
-                pid_ns_release_proc(p->nsproxy->pid_ns);
         exit_task_namespaces(p);
 bad_fork_cleanup_mm:
         if (p->mm)
@@ -1503,7 +1506,7 @@ bad_fork_cleanup_cgroup:
 #endif
         if (clone_flags & CLONE_THREAD)
                 threadgroup_change_end(current);
-        cgroup_exit(p, cgroup_callbacks_done);
+        cgroup_exit(p, 0);
         delayacct_tsk_free(p);
         module_put(task_thread_info(p)->exec_domain->module);
 bad_fork_cleanup_count:
@@ -1515,12 +1518,6 @@ fork_out:
         return ERR_PTR(retval);
 }
 
-noinline struct pt_regs * __cpuinit __attribute__((weak)) idle_regs(struct pt_regs *regs)
-{
-        memset(regs, 0, sizeof(struct pt_regs));
-        return regs;
-}
-
 static inline void init_idle_pids(struct pid_link *links)
 {
         enum pid_type type;
@@ -1534,10 +1531,7 @@ static inline void init_idle_pids(struct pid_link *links)
 struct task_struct * __cpuinit fork_idle(int cpu)
 {
         struct task_struct *task;
-        struct pt_regs regs;
-
-        task = copy_process(CLONE_VM, 0, idle_regs(&regs), 0, NULL,
-                            &init_struct_pid, 0);
+        task = copy_process(CLONE_VM, 0, 0, NULL, &init_struct_pid, 0);
         if (!IS_ERR(task)) {
                 init_idle_pids(task->pids);
                 init_idle(task, cpu);
@@ -1554,7 +1548,6 @@ struct task_struct * __cpuinit fork_idle(int cpu)
  */
 long do_fork(unsigned long clone_flags,
               unsigned long stack_start,
-              struct pt_regs *regs,
               unsigned long stack_size,
               int __user *parent_tidptr,
               int __user *child_tidptr)
@@ -1567,15 +1560,9 @@ long do_fork(unsigned long clone_flags,
          * Do some preliminary argument and permissions checking before we
          * actually start allocating stuff
          */
-        if (clone_flags & CLONE_NEWUSER) {
-                if (clone_flags & CLONE_THREAD)
+        if (clone_flags & (CLONE_NEWUSER | CLONE_NEWPID)) {
+                if (clone_flags & (CLONE_THREAD|CLONE_PARENT))
                         return -EINVAL;
-                /* hopefully this check will go away when userns support is
-                 * complete
-                 */
-                if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SETUID) ||
-                                !capable(CAP_SETGID))
-                        return -EPERM;
         }
 
         /*
@@ -1584,7 +1571,7 @@ long do_fork(unsigned long clone_flags,
          * requested, no event is reported; otherwise, report if the event
          * for the type of forking is enabled.
          */
-        if (!(clone_flags & CLONE_UNTRACED) && likely(user_mode(regs))) {
+        if (!(clone_flags & CLONE_UNTRACED)) {
                 if (clone_flags & CLONE_VFORK)
                         trace = PTRACE_EVENT_VFORK;
                 else if ((clone_flags & CSIGNAL) != SIGCHLD)
@@ -1596,7 +1583,7 @@ long do_fork(unsigned long clone_flags,
                         trace = 0;
         }
 
-        p = copy_process(clone_flags, stack_start, regs, stack_size,
+        p = copy_process(clone_flags, stack_start, stack_size,
                          child_tidptr, NULL, trace);
         /*
          * Do this prior waking up the new thread - the thread pointer
@@ -1634,15 +1621,56 @@ long do_fork(unsigned long clone_flags,
         return nr;
 }
 
-#ifdef CONFIG_GENERIC_KERNEL_THREAD
 /*
  * Create a kernel thread.
  */
 pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
 {
-        return do_fork(flags|CLONE_VM|CLONE_UNTRACED, (unsigned long)fn, NULL,
+        return do_fork(flags|CLONE_VM|CLONE_UNTRACED, (unsigned long)fn,
                 (unsigned long)arg, NULL, NULL);
 }
+
+#ifdef __ARCH_WANT_SYS_FORK
+SYSCALL_DEFINE0(fork)
+{
+#ifdef CONFIG_MMU
+        return do_fork(SIGCHLD, 0, 0, NULL, NULL);
+#else
+        /* can not support in nommu mode */
+        return(-EINVAL);
+#endif
+}
+#endif
+
+#ifdef __ARCH_WANT_SYS_VFORK
+SYSCALL_DEFINE0(vfork)
+{
+        return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, 0, 
+                        0, NULL, NULL);
+}
+#endif
+
+#ifdef __ARCH_WANT_SYS_CLONE
+#ifdef CONFIG_CLONE_BACKWARDS
+SYSCALL_DEFINE5(clone, unsigned long, clone_flags, unsigned long, newsp,
+                 int __user *, parent_tidptr,
+                 int, tls_val,
+                 int __user *, child_tidptr)
+#elif defined(CONFIG_CLONE_BACKWARDS2)
+SYSCALL_DEFINE5(clone, unsigned long, newsp, unsigned long, clone_flags,
+                 int __user *, parent_tidptr,
+                 int __user *, child_tidptr,
+                 int, tls_val)
+#else
+SYSCALL_DEFINE5(clone, unsigned long, clone_flags, unsigned long, newsp,
+                 int __user *, parent_tidptr,
+                 int __user *, child_tidptr,
+                 int, tls_val)
+#endif
+{
+        return do_fork(clone_flags, newsp, 0,
+                parent_tidptr, child_tidptr);
+}
 #endif
 
 #ifndef ARCH_MIN_MMSTRUCT_ALIGN
@@ -1694,7 +1722,8 @@ static int check_unshare_flags(unsigned long unshare_flags)
 {
         if (unshare_flags & ~(CLONE_THREAD|CLONE_FS|CLONE_NEWNS|CLONE_SIGHAND|
                                 CLONE_VM|CLONE_FILES|CLONE_SYSVSEM|
-                                CLONE_NEWUTS|CLONE_NEWIPC|CLONE_NEWNET))
+                                CLONE_NEWUTS|CLONE_NEWIPC|CLONE_NEWNET|
+                                CLONE_NEWUSER|CLONE_NEWPID))
                 return -EINVAL;
         /*
          * Not implemented, but pretend it works if there is nothing to
@@ -1761,19 +1790,40 @@ SYSCALL_DEFINE1(unshare, unsigned long, unshare_flags)
 {
         struct fs_struct *fs, *new_fs = NULL;
         struct files_struct *fd, *new_fd = NULL;
+        struct cred *new_cred = NULL;
         struct nsproxy *new_nsproxy = NULL;
         int do_sysvsem = 0;
         int err;
 
-        err = check_unshare_flags(unshare_flags);
-        if (err)
-                goto bad_unshare_out;
-
+        /*
+         * If unsharing a user namespace must also unshare the thread.
+         */
+        if (unshare_flags & CLONE_NEWUSER)
+                unshare_flags |= CLONE_THREAD;
+        /*
+         * If unsharing a pid namespace must also unshare the thread.
+         */
+        if (unshare_flags & CLONE_NEWPID)
+                unshare_flags |= CLONE_THREAD;
+        /*
+         * If unsharing a thread from a thread group, must also unshare vm.
+         */
+        if (unshare_flags & CLONE_THREAD)
+                unshare_flags |= CLONE_VM;
+        /*
+         * If unsharing vm, must also unshare signal handlers.
+         */
+        if (unshare_flags & CLONE_VM)
+                unshare_flags |= CLONE_SIGHAND;
         /*
          * If unsharing namespace, must also unshare filesystem information.
          */
         if (unshare_flags & CLONE_NEWNS)
                 unshare_flags |= CLONE_FS;
+
+        err = check_unshare_flags(unshare_flags);
+        if (err)
+                goto bad_unshare_out;
         /*
          * CLONE_NEWIPC must also detach from the undolist: after switching
          * to a new ipc namespace, the semaphore arrays from the old
@@ -1787,11 +1837,15 @@ SYSCALL_DEFINE1(unshare, unsigned long, unshare_flags)
         err = unshare_fd(unshare_flags, &new_fd);
         if (err)
                 goto bad_unshare_cleanup_fs;
-        err = unshare_nsproxy_namespaces(unshare_flags, &new_nsproxy, new_fs);
+        err = unshare_userns(unshare_flags, &new_cred);
         if (err)
                 goto bad_unshare_cleanup_fd;
+        err = unshare_nsproxy_namespaces(unshare_flags, &new_nsproxy,
+                                         new_cred, new_fs);
+        if (err)
+                goto bad_unshare_cleanup_cred;
 
-        if (new_fs || new_fd || do_sysvsem || new_nsproxy) {
+        if (new_fs || new_fd || do_sysvsem || new_cred || new_nsproxy) {
                 if (do_sysvsem) {
                         /*
                          * CLONE_SYSVSEM is equivalent to sys_exit().
@@ -1824,11 +1878,20 @@ SYSCALL_DEFINE1(unshare, unsigned long, unshare_flags)
                 }
 
                 task_unlock(current);
+
+                if (new_cred) {
+                        /* Install the new user namespace */
+                        commit_creds(new_cred);
+                        new_cred = NULL;
+                }
         }
 
         if (new_nsproxy)
                 put_nsproxy(new_nsproxy);
 
+bad_unshare_cleanup_cred:
+        if (new_cred)
+                put_cred(new_cred);
 bad_unshare_cleanup_fd:
         if (new_fd)
                 put_files_struct(new_fd);