From: Serge E. Hallyn <serue@us.ibm.com>
Date: Tue, 27 Mar 2007 05:32:31 +0000 (-0800)
Subject: [PATCH] ipcns: fix !CONFIG_IPC_NS behavior
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=a28d193cbf01375974683c13e99a52ef489e5eb0;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

[PATCH] ipcns: fix !CONFIG_IPC_NS behavior

When CONFIG_IPC_NS=n, clone(CLONE_NEWIPC) claims success, but did not actually
clone a new IPC namespace.

Fix this to return -EINVAL so the caller knows his request was denied.

Signed-off-by: Serge E. Hallyn <serue@us.ibm.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/include/linux/ipc.h b/include/linux/ipc.h
index 636094c29b16..6da6772c19ff 100644
--- a/include/linux/ipc.h
+++ b/include/linux/ipc.h
@@ -92,19 +92,16 @@ extern struct ipc_namespace init_ipc_ns;
 
 #ifdef CONFIG_SYSVIPC
 #define INIT_IPC_NS(ns)		.ns		= &init_ipc_ns,
+extern int copy_ipcs(unsigned long flags, struct task_struct *tsk);
 #else
 #define INIT_IPC_NS(ns)
+static inline int copy_ipcs(unsigned long flags, struct task_struct *tsk)
+{ return 0; }
 #endif
 
 #ifdef CONFIG_IPC_NS
 extern void free_ipc_ns(struct kref *kref);
-extern int copy_ipcs(unsigned long flags, struct task_struct *tsk);
 extern int unshare_ipcs(unsigned long flags, struct ipc_namespace **ns);
-#else
-static inline int copy_ipcs(unsigned long flags, struct task_struct *tsk)
-{
-	return 0;
-}
 #endif
 
 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
diff --git a/ipc/util.c b/ipc/util.c
index 08a647965b9e..0b652387d169 100644
--- a/ipc/util.c
+++ b/ipc/util.c
@@ -144,6 +144,13 @@ void free_ipc_ns(struct kref *kref)
 	shm_exit_ns(ns);
 	kfree(ns);
 }
+#else
+int copy_ipcs(unsigned long flags, struct task_struct *tsk)
+{
+	if (flags & CLONE_NEWIPC)
+		return -EINVAL;
+	return 0;
+}
 #endif
 
 /**