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-rw-r--r--ipc/sem.c1
-rw-r--r--kernel/fork.c29
2 files changed, 12 insertions, 18 deletions
diff --git a/ipc/sem.c b/ipc/sem.c
index d56d3ab6bb8..e9418df5ff3 100644
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -1250,6 +1250,7 @@ void exit_sem(struct task_struct *tsk)
undo_list = tsk->sysvsem.undo_list;
if (!undo_list)
return;
+ tsk->sysvsem.undo_list = NULL;
if (!atomic_dec_and_test(&undo_list->refcnt))
return;
diff --git a/kernel/fork.c b/kernel/fork.c
index 156db96ff75..01666979bea 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
}
/*
- * Unsharing of semundo for tasks created with CLONE_SYSVSEM is not
- * supported yet
- */
-static int unshare_semundo(unsigned long unshare_flags, struct sem_undo_list **new_ulistp)
-{
- if (unshare_flags & CLONE_SYSVSEM)
- return -EINVAL;
-
- return 0;
-}
-
-/*
* unshare allows a process to 'unshare' part of the process
* context which was originally shared using clone. copy_*
* functions used by do_fork() cannot be used here directly
@@ -1695,8 +1683,8 @@ asmlinkage long sys_unshare(unsigned long unshare_flags)
struct sighand_struct *new_sigh = NULL;
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 = NULL;
+ int do_sysvsem = 0;
check_unshare_flags(&unshare_flags);
@@ -1708,6 +1696,8 @@ asmlinkage long sys_unshare(unsigned long unshare_flags)
CLONE_NEWNET))
goto bad_unshare_out;
+ if (unshare_flags & CLONE_SYSVSEM)
+ do_sysvsem = 1;
if ((err = unshare_thread(unshare_flags)))
goto bad_unshare_out;
if ((err = unshare_fs(unshare_flags, &new_fs)))
@@ -1718,13 +1708,17 @@ asmlinkage long sys_unshare(unsigned long unshare_flags)
goto bad_unshare_cleanup_sigh;
if ((err = unshare_fd(unshare_flags, &new_fd)))
goto bad_unshare_cleanup_vm;
- if ((err = unshare_semundo(unshare_flags, &new_ulist)))
- goto bad_unshare_cleanup_fd;
if ((err = unshare_nsproxy_namespaces(unshare_flags, &new_nsproxy,
new_fs)))
- goto bad_unshare_cleanup_semundo;
+ goto bad_unshare_cleanup_fd;
- if (new_fs || new_mm || new_fd || new_ulist || new_nsproxy) {
+ if (new_fs || new_mm || new_fd || do_sysvsem || new_nsproxy) {
+ if (do_sysvsem) {
+ /*
+ * CLONE_SYSVSEM is equivalent to sys_exit().
+ */
+ exit_sem(current);
+ }
if (new_nsproxy) {
switch_task_namespaces(current, new_nsproxy);
@@ -1760,7 +1754,6 @@ asmlinkage long sys_unshare(unsigned long unshare_flags)
if (new_nsproxy)
put_nsproxy(new_nsproxy);
-bad_unshare_cleanup_semundo:
bad_unshare_cleanup_fd:
if (new_fd)
put_files_struct(new_fd);