[PATCH] Fix typos in mm/shmem_acl.c

[linux-2.6] / kernel / fork.c

diff --git a/kernel/fork.c b/kernel/fork.c
index 33fcf0733ca64bc4ab7aeab0442ef49d57bcbbc0..7dc6140baac69325f1ce2fa08fa9bd858aa57258 100644 (file)
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1589,6 +1589,16 @@ static int unshare_semundo(unsigned long unshare_flags, struct sem_undo_list **n
        return 0;
 }
 
+#ifndef CONFIG_IPC_NS
+static inline int unshare_ipcs(unsigned long flags, struct ipc_namespace **ns)
+{
+       if (flags & CLONE_NEWIPC)
+               return -EINVAL;
+
+       return 0;
+}
+#endif
+
 /*
  * unshare allows a process to 'unshare' part of the process
  * context which was originally shared using clone.  copy_*
@@ -1606,14 +1616,17 @@ asmlinkage long sys_unshare(unsigned long unshare_flags)
        struct mm_struct *mm, *new_mm = NULL, *active_mm = NULL;
        struct files_struct *fd, *new_fd = NULL;
        struct sem_undo_list *new_ulist = NULL;
-       struct nsproxy *new_nsproxy, *old_nsproxy;
+       struct nsproxy *new_nsproxy = NULL, *old_nsproxy = NULL;
+       struct uts_namespace *uts, *new_uts = NULL;
+       struct ipc_namespace *ipc, *new_ipc = NULL;
 
        check_unshare_flags(&unshare_flags);
 
        /* Return -EINVAL for all unsupported flags */
        err = -EINVAL;
        if (unshare_flags & ~(CLONE_THREAD|CLONE_FS|CLONE_NEWNS|CLONE_SIGHAND|
-                               CLONE_VM|CLONE_FILES|CLONE_SYSVSEM))
+                               CLONE_VM|CLONE_FILES|CLONE_SYSVSEM|
+                               CLONE_NEWUTS|CLONE_NEWIPC))
                goto bad_unshare_out;
 
        if ((err = unshare_thread(unshare_flags)))
@@ -1630,18 +1643,29 @@ asmlinkage long sys_unshare(unsigned long unshare_flags)
                goto bad_unshare_cleanup_vm;
        if ((err = unshare_semundo(unshare_flags, &new_ulist)))
                goto bad_unshare_cleanup_fd;
+       if ((err = unshare_utsname(unshare_flags, &new_uts)))
+               goto bad_unshare_cleanup_semundo;
+       if ((err = unshare_ipcs(unshare_flags, &new_ipc)))
+               goto bad_unshare_cleanup_uts;
 
-       if (new_fs || new_ns || new_sigh || new_mm || new_fd || new_ulist) {
-
+       if (new_ns || new_uts || new_ipc) {
                old_nsproxy = current->nsproxy;
                new_nsproxy = dup_namespaces(old_nsproxy);
                if (!new_nsproxy) {
                        err = -ENOMEM;
-                       goto bad_unshare_cleanup_semundo;
+                       goto bad_unshare_cleanup_ipc;
                }
+       }
+
+       if (new_fs || new_ns || new_sigh || new_mm || new_fd || new_ulist ||
+                               new_uts || new_ipc) {
 
                task_lock(current);
-               current->nsproxy = new_nsproxy;
+
+               if (new_nsproxy) {
+                       current->nsproxy = new_nsproxy;
+                       new_nsproxy = old_nsproxy;
+               }
 
                if (new_fs) {
                        fs = current->fs;
@@ -1676,10 +1700,32 @@ asmlinkage long sys_unshare(unsigned long unshare_flags)
                        new_fd = fd;
                }
 
+               if (new_uts) {
+                       uts = current->nsproxy->uts_ns;
+                       current->nsproxy->uts_ns = new_uts;
+                       new_uts = uts;
+               }
+
+               if (new_ipc) {
+                       ipc = current->nsproxy->ipc_ns;
+                       current->nsproxy->ipc_ns = new_ipc;
+                       new_ipc = ipc;
+               }
+
                task_unlock(current);
-               put_nsproxy(old_nsproxy);
        }
 
+       if (new_nsproxy)
+               put_nsproxy(new_nsproxy);
+
+bad_unshare_cleanup_ipc:
+       if (new_ipc)
+               put_ipc_ns(new_ipc);
+
+bad_unshare_cleanup_uts:
+       if (new_uts)
+               put_uts_ns(new_uts);
+
 bad_unshare_cleanup_semundo:
 bad_unshare_cleanup_fd:
        if (new_fd)