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-rw-r--r--kernel/fork.c29
1 files changed, 11 insertions, 18 deletions
diff --git a/kernel/fork.c b/kernel/fork.c
index 156db96ff754..01666979beac 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1669,18 +1669,6 @@ static int unshare_fd(unsigned long unshare_flags, struct files_struct **new_fdp
1669} 1669}
1670 1670
1671/* 1671/*
1672 * Unsharing of semundo for tasks created with CLONE_SYSVSEM is not
1673 * supported yet
1674 */
1675static int unshare_semundo(unsigned long unshare_flags, struct sem_undo_list **new_ulistp)
1676{
1677 if (unshare_flags & CLONE_SYSVSEM)
1678 return -EINVAL;
1679
1680 return 0;
1681}
1682
1683/*
1684 * unshare allows a process to 'unshare' part of the process 1672 * unshare allows a process to 'unshare' part of the process
1685 * context which was originally shared using clone. copy_* 1673 * context which was originally shared using clone. copy_*
1686 * functions used by do_fork() cannot be used here directly 1674 * functions used by do_fork() cannot be used here directly
@@ -1695,8 +1683,8 @@ asmlinkage long sys_unshare(unsigned long unshare_flags)
1695 struct sighand_struct *new_sigh = NULL; 1683 struct sighand_struct *new_sigh = NULL;
1696 struct mm_struct *mm, *new_mm = NULL, *active_mm = NULL; 1684 struct mm_struct *mm, *new_mm = NULL, *active_mm = NULL;
1697 struct files_struct *fd, *new_fd = NULL; 1685 struct files_struct *fd, *new_fd = NULL;
1698 struct sem_undo_list *new_ulist = NULL;
1699 struct nsproxy *new_nsproxy = NULL; 1686 struct nsproxy *new_nsproxy = NULL;
1687 int do_sysvsem = 0;
1700 1688
1701 check_unshare_flags(&unshare_flags); 1689 check_unshare_flags(&unshare_flags);
1702 1690
@@ -1708,6 +1696,8 @@ asmlinkage long sys_unshare(unsigned long unshare_flags)
1708 CLONE_NEWNET)) 1696 CLONE_NEWNET))
1709 goto bad_unshare_out; 1697 goto bad_unshare_out;
1710 1698
1699 if (unshare_flags & CLONE_SYSVSEM)
1700 do_sysvsem = 1;
1711 if ((err = unshare_thread(unshare_flags))) 1701 if ((err = unshare_thread(unshare_flags)))
1712 goto bad_unshare_out; 1702 goto bad_unshare_out;
1713 if ((err = unshare_fs(unshare_flags, &new_fs))) 1703 if ((err = unshare_fs(unshare_flags, &new_fs)))
@@ -1718,13 +1708,17 @@ asmlinkage long sys_unshare(unsigned long unshare_flags)
1718 goto bad_unshare_cleanup_sigh; 1708 goto bad_unshare_cleanup_sigh;
1719 if ((err = unshare_fd(unshare_flags, &new_fd))) 1709 if ((err = unshare_fd(unshare_flags, &new_fd)))
1720 goto bad_unshare_cleanup_vm; 1710 goto bad_unshare_cleanup_vm;
1721 if ((err = unshare_semundo(unshare_flags, &new_ulist)))
1722 goto bad_unshare_cleanup_fd;
1723 if ((err = unshare_nsproxy_namespaces(unshare_flags, &new_nsproxy, 1711 if ((err = unshare_nsproxy_namespaces(unshare_flags, &new_nsproxy,
1724 new_fs))) 1712 new_fs)))
1725 goto bad_unshare_cleanup_semundo; 1713 goto bad_unshare_cleanup_fd;
1726 1714
1727 if (new_fs || new_mm || new_fd || new_ulist || new_nsproxy) { 1715 if (new_fs || new_mm || new_fd || do_sysvsem || new_nsproxy) {
1716 if (do_sysvsem) {
1717 /*
1718 * CLONE_SYSVSEM is equivalent to sys_exit().
1719 */
1720 exit_sem(current);
1721 }
1728 1722
1729 if (new_nsproxy) { 1723 if (new_nsproxy) {
1730 switch_task_namespaces(current, new_nsproxy); 1724 switch_task_namespaces(current, new_nsproxy);
@@ -1760,7 +1754,6 @@ asmlinkage long sys_unshare(unsigned long unshare_flags)
1760 if (new_nsproxy) 1754 if (new_nsproxy)
1761 put_nsproxy(new_nsproxy); 1755 put_nsproxy(new_nsproxy);
1762 1756
1763bad_unshare_cleanup_semundo:
1764bad_unshare_cleanup_fd: 1757bad_unshare_cleanup_fd:
1765 if (new_fd) 1758 if (new_fd)
1766 put_files_struct(new_fd); 1759 put_files_struct(new_fd);