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Date: Tue, 12 Aug 2014 09:29:17 +0200
From: Manfred Spraul <manfred@...orfullife.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
Davidlohr Bueso <davidlohr.bueso@...com>,
Michael Kerrisk <mtk.manpages@...il.com>,
Rafael Aquini <aquini@...hat.com>,
Rik van Riel <riel@...hat.com>, 1vier1@....de,
Manfred Spraul <manfred@...orfullife.com>, serge@...lyn.com,
ebiederm@...ssion.com, containers@...ts.linux-foundation.org
Subject: [PATCH 3/3] ipc namespace: copy settings from parent namespace
Right now, each new IPC namespace starts with the kernel default values.
This means that changes that were made to the limits get overwritten.
With this patch, a new namespace inherits the settings from the parent
namespace, which is less surprising.
The patch updates
- SysV msg
- SysV sem
- SysV shm
- POSIX mqueues
Cc: serge@...lyn.com
Cc: ebiederm@...ssion.com
Cc: containers@...ts.linux-foundation.org
Cc: mtk.manpages@...il.com
Signed-off-by: Manfred Spraul <manfred@...orfullife.com>
---
include/linux/ipc_namespace.h | 6 ++++--
ipc/mqueue.c | 23 ++++++++++++++++-------
ipc/msg.c | 16 +++++++++++-----
ipc/namespace.c | 8 ++++----
ipc/sem.c | 19 +++++++++++++------
ipc/shm.c | 19 +++++++++++++------
ipc/util.h | 20 ++++++++++++++------
7 files changed, 75 insertions(+), 36 deletions(-)
diff --git a/include/linux/ipc_namespace.h b/include/linux/ipc_namespace.h
index e365d5e..1cc36a0 100644
--- a/include/linux/ipc_namespace.h
+++ b/include/linux/ipc_namespace.h
@@ -73,7 +73,7 @@ static inline void shm_destroy_orphaned(struct ipc_namespace *ns) {}
#endif /* CONFIG_SYSVIPC */
#ifdef CONFIG_POSIX_MQUEUE
-extern int mq_init_ns(struct ipc_namespace *ns);
+extern int mq_init_ns(struct ipc_namespace *ns, struct ipc_namespace *old_ns);
/*
* POSIX Message Queue default values:
*
@@ -108,7 +108,9 @@ extern int mq_init_ns(struct ipc_namespace *ns);
#define DFLT_MSGSIZEMAX 8192
#define HARD_MSGSIZEMAX (16*1024*1024)
#else
-static inline int mq_init_ns(struct ipc_namespace *ns) { return 0; }
+static inline int mq_init_ns(struct ipc_namespace *ns,
+ struct ipc_namespace *old_ns)
+{ return 0; }
#endif
#if defined(CONFIG_IPC_NS)
diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index 4fcf39a..3473072d 100644
--- a/ipc/mqueue.c
+++ b/ipc/mqueue.c
@@ -1397,14 +1397,23 @@ static struct file_system_type mqueue_fs_type = {
.fs_flags = FS_USERNS_MOUNT,
};
-int mq_init_ns(struct ipc_namespace *ns)
+int mq_init_ns(struct ipc_namespace *ns, struct ipc_namespace *old_ns)
{
+ if (old_ns != NULL) {
+ ns->mq_queues_max = old_ns->mq_queues_max;
+ ns->mq_msg_max = old_ns->mq_msg_max;
+ ns->mq_msgsize_max = old_ns->mq_msgsize_max;
+ ns->mq_msg_default = old_ns->mq_msg_default;
+ ns->mq_msgsize_default = old_ns->mq_msgsize_default;
+ } else {
+ ns->mq_queues_max = DFLT_QUEUESMAX;
+ ns->mq_msg_max = DFLT_MSGMAX;
+ ns->mq_msgsize_max = DFLT_MSGSIZEMAX;
+ ns->mq_msg_default = DFLT_MSG;
+ ns->mq_msgsize_default = DFLT_MSGSIZE;
+ }
+
ns->mq_queues_count = 0;
- ns->mq_queues_max = DFLT_QUEUESMAX;
- ns->mq_msg_max = DFLT_MSGMAX;
- ns->mq_msgsize_max = DFLT_MSGSIZEMAX;
- ns->mq_msg_default = DFLT_MSG;
- ns->mq_msgsize_default = DFLT_MSGSIZE;
ns->mq_mnt = kern_mount_data(&mqueue_fs_type, ns);
if (IS_ERR(ns->mq_mnt)) {
@@ -1444,7 +1453,7 @@ static int __init init_mqueue_fs(void)
spin_lock_init(&mq_lock);
- error = mq_init_ns(&init_ipc_ns);
+ error = mq_init_ns(&init_ipc_ns, NULL);
if (error)
goto out_filesystem;
diff --git a/ipc/msg.c b/ipc/msg.c
index a7261d5..3cbd2ad 100644
--- a/ipc/msg.c
+++ b/ipc/msg.c
@@ -990,11 +990,17 @@ SYSCALL_DEFINE5(msgrcv, int, msqid, struct msgbuf __user *, msgp, size_t, msgsz,
}
-void msg_init_ns(struct ipc_namespace *ns)
+void msg_init_ns(struct ipc_namespace *ns, struct ipc_namespace *old_ns)
{
- ns->msg_ctlmax = MSGMAX;
- ns->msg_ctlmnb = MSGMNB;
- ns->msg_ctlmni = MSGMNI;
+ if (old_ns != NULL) {
+ ns->msg_ctlmax = old_ns->msg_ctlmax;
+ ns->msg_ctlmnb = old_ns->msg_ctlmnb;
+ ns->msg_ctlmni = old_ns->msg_ctlmni;
+ } else {
+ ns->msg_ctlmax = MSGMAX;
+ ns->msg_ctlmnb = MSGMNB;
+ ns->msg_ctlmni = MSGMNI;
+ }
atomic_set(&ns->msg_bytes, 0);
atomic_set(&ns->msg_hdrs, 0);
@@ -1036,7 +1042,7 @@ static int sysvipc_msg_proc_show(struct seq_file *s, void *it)
void __init msg_init(void)
{
- msg_init_ns(&init_ipc_ns);
+ msg_init_ns(&init_ipc_ns, NULL);
ipc_init_proc_interface("sysvipc/msg",
" key msqid perms cbytes qnum lspid lrpid uid gid cuid cgid stime rtime ctime\n",
diff --git a/ipc/namespace.c b/ipc/namespace.c
index 1a3ffd4..97e3332 100644
--- a/ipc/namespace.c
+++ b/ipc/namespace.c
@@ -33,7 +33,7 @@ static struct ipc_namespace *create_ipc_ns(struct user_namespace *user_ns,
}
atomic_set(&ns->count, 1);
- err = mq_init_ns(ns);
+ err = mq_init_ns(ns, old_ns);
if (err) {
proc_free_inum(ns->proc_inum);
kfree(ns);
@@ -41,9 +41,9 @@ static struct ipc_namespace *create_ipc_ns(struct user_namespace *user_ns,
}
atomic_inc(&nr_ipc_ns);
- sem_init_ns(ns);
- msg_init_ns(ns);
- shm_init_ns(ns);
+ sem_init_ns(ns, old_ns);
+ msg_init_ns(ns, old_ns);
+ shm_init_ns(ns, old_ns);
ns->user_ns = get_user_ns(user_ns);
diff --git a/ipc/sem.c b/ipc/sem.c
index 454f6c6..f1ded77 100644
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -170,12 +170,19 @@ static int sysvipc_sem_proc_show(struct seq_file *s, void *it);
#define sc_semopm sem_ctls[2]
#define sc_semmni sem_ctls[3]
-void sem_init_ns(struct ipc_namespace *ns)
+void sem_init_ns(struct ipc_namespace *ns, struct ipc_namespace *old_ns)
{
- ns->sc_semmsl = SEMMSL;
- ns->sc_semmns = SEMMNS;
- ns->sc_semopm = SEMOPM;
- ns->sc_semmni = SEMMNI;
+ if (old_ns != NULL) {
+ ns->sc_semmsl = old_ns->sc_semmsl;
+ ns->sc_semmns = old_ns->sc_semmns;
+ ns->sc_semopm = old_ns->sc_semopm;
+ ns->sc_semmni = old_ns->sc_semmni;
+ } else {
+ ns->sc_semmsl = SEMMSL;
+ ns->sc_semmns = SEMMNS;
+ ns->sc_semopm = SEMOPM;
+ ns->sc_semmni = SEMMNI;
+ }
ns->used_sems = 0;
ipc_init_ids(&ns->ids[IPC_SEM_IDS]);
}
@@ -190,7 +197,7 @@ void sem_exit_ns(struct ipc_namespace *ns)
void __init sem_init(void)
{
- sem_init_ns(&init_ipc_ns);
+ sem_init_ns(&init_ipc_ns, NULL);
ipc_init_proc_interface("sysvipc/sem",
" key semid perms nsems uid gid cuid cgid otime ctime\n",
IPC_SEM_IDS, sysvipc_sem_proc_show);
diff --git a/ipc/shm.c b/ipc/shm.c
index 7fc9f9f..7856952 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -72,12 +72,19 @@ static void shm_destroy(struct ipc_namespace *ns, struct shmid_kernel *shp);
static int sysvipc_shm_proc_show(struct seq_file *s, void *it);
#endif
-void shm_init_ns(struct ipc_namespace *ns)
+void shm_init_ns(struct ipc_namespace *ns, struct ipc_namespace *old_ns)
{
- ns->shm_ctlmax = SHMMAX;
- ns->shm_ctlall = SHMALL;
- ns->shm_ctlmni = SHMMNI;
- ns->shm_rmid_forced = 0;
+ if (old_ns != NULL) {
+ ns->shm_ctlmax = old_ns->shm_ctlmax;
+ ns->shm_ctlall = old_ns->shm_ctlall;
+ ns->shm_ctlmni = old_ns->shm_ctlmni;
+ ns->shm_rmid_forced = old_ns->shm_rmid_forced;
+ } else {
+ ns->shm_ctlmax = SHMMAX;
+ ns->shm_ctlall = SHMALL;
+ ns->shm_ctlmni = SHMMNI;
+ ns->shm_rmid_forced = 0;
+ }
ns->shm_tot = 0;
ipc_init_ids(&shm_ids(ns));
}
@@ -110,7 +117,7 @@ void shm_exit_ns(struct ipc_namespace *ns)
static int __init ipc_ns_init(void)
{
- shm_init_ns(&init_ipc_ns);
+ shm_init_ns(&init_ipc_ns, NULL);
return 0;
}
diff --git a/ipc/util.h b/ipc/util.h
index 1a5a0fc..1be9830 100644
--- a/ipc/util.h
+++ b/ipc/util.h
@@ -30,17 +30,25 @@ static inline void mq_put_mnt(struct ipc_namespace *ns) { }
#endif
#ifdef CONFIG_SYSVIPC
-void sem_init_ns(struct ipc_namespace *ns);
-void msg_init_ns(struct ipc_namespace *ns);
-void shm_init_ns(struct ipc_namespace *ns);
+void sem_init_ns(struct ipc_namespace *ns, struct ipc_namespace *old_ns);
+void msg_init_ns(struct ipc_namespace *ns, struct ipc_namespace *old_ns);
+void shm_init_ns(struct ipc_namespace *ns, struct ipc_namespace *old_ns);
void sem_exit_ns(struct ipc_namespace *ns);
void msg_exit_ns(struct ipc_namespace *ns);
void shm_exit_ns(struct ipc_namespace *ns);
#else
-static inline void sem_init_ns(struct ipc_namespace *ns) { }
-static inline void msg_init_ns(struct ipc_namespace *ns) { }
-static inline void shm_init_ns(struct ipc_namespace *ns) { }
+static inline void sem_init_ns(struct ipc_namespace *ns,
+ struct ipc_namespace *old_ns)
+{ }
+
+static inline void msg_init_ns(struct ipc_namespace *ns,
+ struct ipc_namespace *old_ns)
+{ }
+
+static inline void shm_init_ns(struct ipc_namespace *ns,
+ struct ipc_namespace *old_ns)
+{ }
static inline void sem_exit_ns(struct ipc_namespace *ns) { }
static inline void msg_exit_ns(struct ipc_namespace *ns) { }
--
1.9.3
--
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