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authorSerge E. Hallyn <serue@us.ibm.com>2007-01-30 15:28:23 -0600
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-01-30 13:40:36 -0800
commit0f2452855d86901ba3766826ccb5606ea4e15ab9 (patch)
treeb5a48b7bc49bbfdf97434e4f9cc83607d78eb0de
parent444f378b237a0f728f5c4aba752c08d13c209344 (diff)
downloadlinux-2.6.34-ux500-0f2452855d86901ba3766826ccb5606ea4e15ab9.tar.gz
[PATCH] namespaces: fix task exit disaster
This is based on a patch by Eric W. Biederman, who pointed out that pid namespaces are still fake, and we only have one ever active. So for the time being, we can modify any code which could access tsk->nsproxy->pid_ns during task exit to just use &init_pid_ns instead, and move the exit_task_namespaces call in do_exit() back above exit_notify(), so that an exiting nfs server has a valid tsk->sighand to work with. Long term, pulling pid_ns out of nsproxy might be the cleanest solution. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> [ Eric's patch fixed to take care of free_pid() too ] Signed-off-by: Serge E. Hallyn <serue@us.ibm.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--include/linux/pid_namespace.h2
-rw-r--r--kernel/exit.c2
-rw-r--r--kernel/pid.c2
3 files changed, 3 insertions, 3 deletions
diff --git a/include/linux/pid_namespace.h b/include/linux/pid_namespace.h
index d2a9d419f01..2833806d42c 100644
--- a/include/linux/pid_namespace.h
+++ b/include/linux/pid_namespace.h
@@ -39,7 +39,7 @@ static inline void put_pid_ns(struct pid_namespace *ns)
static inline struct task_struct *child_reaper(struct task_struct *tsk)
{
- return tsk->nsproxy->pid_ns->child_reaper;
+ return init_pid_ns.child_reaper;
}
#endif /* _LINUX_PID_NS_H */
diff --git a/kernel/exit.c b/kernel/exit.c
index 35401720635..fec12eb1247 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -938,8 +938,8 @@ fastcall NORET_TYPE void do_exit(long code)
tsk->exit_code = code;
proc_exit_connector(tsk);
- exit_notify(tsk);
exit_task_namespaces(tsk);
+ exit_notify(tsk);
#ifdef CONFIG_NUMA
mpol_free(tsk->mempolicy);
tsk->mempolicy = NULL;
diff --git a/kernel/pid.c b/kernel/pid.c
index 2efe9d8d367..78f2aee90f5 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -197,7 +197,7 @@ fastcall void free_pid(struct pid *pid)
hlist_del_rcu(&pid->pid_chain);
spin_unlock_irqrestore(&pidmap_lock, flags);
- free_pidmap(current->nsproxy->pid_ns, pid->nr);
+ free_pidmap(&init_pid_ns, pid->nr);
call_rcu(&pid->rcu, delayed_put_pid);
}