From: Sukadev Bhattiprolu <[EMAIL PROTECTED]>
Subject: [PATCH 7/7]: Enable cloning PTY namespaces
Enable cloning PTY namespaces.
Signed-off-by: Sukadev Bhattiprolu <[EMAIL PROTECTED]>
Signed-off-by: Serge Hallyn <[EMAIL PROTECTED]>
Signed-off-by: Matt Helsley <[EMAIL PROTECTED]>
---
fs/devpts/inode.c | 40 +++++++++++++++++++++++++++++++++++++++-
include/linux/devpts_fs.h | 22 ++++++++++++++++++++--
include/linux/init_task.h | 1 +
include/linux/nsproxy.h | 2 ++
include/linux/sched.h | 1 +
kernel/fork.c | 2 +-
kernel/nsproxy.c | 17 +++++++++++++++--
7 files changed, 79 insertions(+), 6 deletions(-)
Index: 2.6.25-rc5-mm1/include/linux/sched.h
===================================================================
--- 2.6.25-rc5-mm1.orig/include/linux/sched.h 2008-03-24 20:02:57.000000000
-0700
+++ 2.6.25-rc5-mm1/include/linux/sched.h 2008-03-24 20:12:56.000000000
-0700
@@ -28,6 +28,7 @@
#define CLONE_NEWPID 0x20000000 /* New pid namespace */
#define CLONE_NEWNET 0x40000000 /* New network namespace */
#define CLONE_IO 0x80000000 /* Clone io context */
+#define CLONE_NEWPTS 0x0000000200000000ULL /* Clone pts ns */
/*
* Scheduling policies
Index: 2.6.25-rc5-mm1/include/linux/nsproxy.h
===================================================================
--- 2.6.25-rc5-mm1.orig/include/linux/nsproxy.h 2008-03-24 20:02:57.000000000
-0700
+++ 2.6.25-rc5-mm1/include/linux/nsproxy.h 2008-03-24 20:12:56.000000000
-0700
@@ -8,6 +8,7 @@ struct mnt_namespace;
struct uts_namespace;
struct ipc_namespace;
struct pid_namespace;
+struct pts_namespace;
/*
* A structure to contain pointers to all per-process
@@ -29,6 +30,7 @@ struct nsproxy {
struct pid_namespace *pid_ns;
struct user_namespace *user_ns;
struct net *net_ns;
+ struct pts_namespace *pts_ns;
};
extern struct nsproxy init_nsproxy;
Index: 2.6.25-rc5-mm1/include/linux/init_task.h
===================================================================
--- 2.6.25-rc5-mm1.orig/include/linux/init_task.h 2008-03-24
20:02:57.000000000 -0700
+++ 2.6.25-rc5-mm1/include/linux/init_task.h 2008-03-24 20:12:56.000000000
-0700
@@ -78,6 +78,7 @@ extern struct nsproxy init_nsproxy;
.mnt_ns = NULL, \
INIT_NET_NS(net_ns) \
INIT_IPC_NS(ipc_ns) \
+ .pts_ns = &init_pts_ns, \
.user_ns = &init_user_ns, \
}
Index: 2.6.25-rc5-mm1/include/linux/devpts_fs.h
===================================================================
--- 2.6.25-rc5-mm1.orig/include/linux/devpts_fs.h 2008-03-24
20:08:57.000000000 -0700
+++ 2.6.25-rc5-mm1/include/linux/devpts_fs.h 2008-03-24 20:12:56.000000000
-0700
@@ -66,7 +66,7 @@ static inline struct pts_namespace *pts_
static inline struct pts_namespace *current_pts_ns(void)
{
- return &init_pts_ns;
+ return current->nsproxy->pts_ns;
}
@@ -83,7 +83,8 @@ struct tty_struct *devpts_get_tty(struct
/* unlink */
void devpts_pty_kill(struct pts_namespace *pts_ns, int number);
-static inline void free_pts_ns(struct kref *ns_kref) { }
+extern struct pts_namespace *new_pts_ns(void);
+extern void free_pts_ns(struct kref *kref);
static inline struct pts_namespace *get_pts_ns(struct pts_namespace *ns)
{
@@ -97,6 +98,15 @@ static inline void put_pts_ns(struct pts
kref_put(&ns->kref, free_pts_ns);
}
+static inline struct pts_namespace *copy_pts_ns(u64 flags,
+ struct pts_namespace *old_ns)
+{
+ if (flags & CLONE_NEWPTS)
+ return new_pts_ns();
+ else
+ return get_pts_ns(old_ns);
+}
+
#else
/* Dummy stubs in the no-pty case */
@@ -112,6 +122,14 @@ static inline struct pts_namespace *get_
}
static inline void put_pts_ns(struct pts_namespace *ns) { }
+
+static inline struct pts_namespace *copy_pts_ns(u64 flags,
+ struct pts_namespace *old_ns)
+{
+ if (flags & CLONE_NEWPTS)
+ return ERR_PTR(-EINVAL);
+ return old_ns;
+}
#endif
Index: 2.6.25-rc5-mm1/fs/devpts/inode.c
===================================================================
--- 2.6.25-rc5-mm1.orig/fs/devpts/inode.c 2008-03-24 20:08:57.000000000
-0700
+++ 2.6.25-rc5-mm1/fs/devpts/inode.c 2008-03-24 20:14:20.000000000 -0700
@@ -27,6 +27,7 @@
extern int pty_limit; /* Config limit on Unix98 ptys */
static DECLARE_MUTEX(allocated_ptys_lock);
+static struct file_system_type devpts_fs_type;
static struct {
int setuid;
@@ -56,6 +57,43 @@ struct pts_namespace init_pts_ns = {
.mnt = NULL,
};
+struct pts_namespace *new_pts_ns(void)
+{
+ struct pts_namespace *ns;
+
+ ns = kmalloc(sizeof(*ns), GFP_KERNEL);
+ if (!ns)
+ return ERR_PTR(-ENOMEM);
+
+ kref_init(&ns->kref);
+
+ ns->mnt = kern_mount_data(&devpts_fs_type, ns);
+ if (IS_ERR(ns->mnt)) {
+ kfree(ns);
+ return ERR_PTR(PTR_ERR(ns->mnt));
+ }
+
+ idr_init(&ns->allocated_ptys);
+ ns->user_mounted = 0;
+
+ return ns;
+}
+
+void free_pts_ns(struct kref *ns_kref)
+{
+ struct pts_namespace *ns;
+
+ ns = container_of(ns_kref, struct pts_namespace, kref);
+ mntput(ns->mnt);
+
+ /*
+ * TODO:
+ * idr_remove_all(&ns->allocated_ptys); introduced in 2.6.23
+ */
+ idr_destroy(&ns->allocated_ptys);
+ kfree(ns);
+}
+
static int devpts_remount(struct super_block *sb, int *flags, char *data)
{
@@ -194,7 +232,7 @@ static int devpts_get_sb(struct file_sys
if (flags & MS_KERNMOUNT)
ns = data;
else
- ns = &init_pts_ns;
+ ns = current_pts_ns();
/* hereafter we're very simlar to get_sb_nodev */
sb = sget(fs_type, devpts_test_sb, devpts_set_sb, ns);
Index: 2.6.25-rc5-mm1/kernel/fork.c
===================================================================
--- 2.6.25-rc5-mm1.orig/kernel/fork.c 2008-03-24 20:02:57.000000000 -0700
+++ 2.6.25-rc5-mm1/kernel/fork.c 2008-03-24 20:12:56.000000000 -0700
@@ -1713,7 +1713,7 @@ static long do_unshare(u64 unshare_flags
if (unshare_flags & ~(CLONE_THREAD|CLONE_FS|CLONE_NEWNS|CLONE_SIGHAND|
CLONE_VM|CLONE_FILES|CLONE_SYSVSEM|
CLONE_NEWUTS|CLONE_NEWIPC|CLONE_NEWUSER|
- CLONE_NEWNET))
+ CLONE_NEWNET|CLONE_NEWPTS))
goto bad_unshare_out;
if ((err = unshare_thread(unshare_flags)))
Index: 2.6.25-rc5-mm1/kernel/nsproxy.c
===================================================================
--- 2.6.25-rc5-mm1.orig/kernel/nsproxy.c 2008-03-24 20:02:57.000000000
-0700
+++ 2.6.25-rc5-mm1/kernel/nsproxy.c 2008-03-24 20:12:56.000000000 -0700
@@ -21,6 +21,7 @@
#include <linux/utsname.h>
#include <linux/pid_namespace.h>
#include <net/net_namespace.h>
+#include <linux/devpts_fs.h>
#include <linux/ipc_namespace.h>
static struct kmem_cache *nsproxy_cachep;
@@ -93,8 +94,17 @@ static struct nsproxy *create_new_namesp
goto out_net;
}
+ new_nsp->pts_ns = copy_pts_ns(flags, tsk->nsproxy->pts_ns);
+ if (IS_ERR(new_nsp->pts_ns)) {
+ err = PTR_ERR(new_nsp->pts_ns);
+ goto out_pts;
+ }
+
return new_nsp;
+out_pts:
+ if (new_nsp->net_ns)
+ put_net(new_nsp->net_ns);
out_net:
if (new_nsp->user_ns)
put_user_ns(new_nsp->user_ns);
@@ -131,7 +141,8 @@ int copy_namespaces(u64 flags, struct ta
get_nsproxy(old_ns);
if (!(flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC |
- CLONE_NEWUSER | CLONE_NEWPID | CLONE_NEWNET)))
+ CLONE_NEWUSER | CLONE_NEWPID | CLONE_NEWNET |
+ CLONE_NEWPTS)))
return 0;
if (!capable(CAP_SYS_ADMIN)) {
@@ -170,6 +181,8 @@ void free_nsproxy(struct nsproxy *ns)
put_pid_ns(ns->pid_ns);
if (ns->user_ns)
put_user_ns(ns->user_ns);
+ if (ns->pts_ns)
+ put_pts_ns(ns->pts_ns);
put_net(ns->net_ns);
kmem_cache_free(nsproxy_cachep, ns);
}
@@ -184,7 +197,7 @@ int unshare_nsproxy_namespaces(u64 unsha
int err = 0;
if (!(unshare_flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC |
- CLONE_NEWUSER | CLONE_NEWNET)))
+ CLONE_NEWUSER | CLONE_NEWNET | CLONE_NEWPTS)))
return 0;
if (!capable(CAP_SYS_ADMIN))
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