From 425fb2b4bf5dde24be4a82e9a2c344bb49ac92e4 Mon Sep 17 00:00:00 2001 From: Pavel Emelyanov Date: Thu, 18 Oct 2007 23:40:07 -0700 Subject: [PATCH] pid namespaces: move alloc_pid() lower in copy_process() When we create new namespace we will need to allocate the struct pid, that will have one extra struct upid in array, comparing to the parent. Thus we need to know the new namespace (if any) in alloc_pid() to init this struct upid properly, so move the alloc_pid() call lower in copy_process(). Signed-off-by: Pavel Emelyanov Cc: Oleg Nesterov Cc: Sukadev Bhattiprolu Cc: Paul Menage Cc: "Eric W. Biederman" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- kernel/fork.c | 31 ++++++++++++++++--------------- 1 file changed, 16 insertions(+), 15 deletions(-) diff --git a/kernel/fork.c b/kernel/fork.c index 984d259e172d..bab34192799b 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -1040,16 +1040,9 @@ static struct task_struct *copy_process(unsigned long clone_flags, if (p->binfmt && !try_module_get(p->binfmt->module)) goto bad_fork_cleanup_put_domain; - if (pid != &init_struct_pid) { - pid = alloc_pid(task_active_pid_ns(p)); - if (!pid) - goto bad_fork_put_binfmt_module; - } - p->did_exec = 0; delayacct_tsk_init(p); /* Must remain after dup_task_struct() */ copy_flags(clone_flags, p); - p->pid = pid_nr(pid); retval = -EFAULT; if (clone_flags & CLONE_PARENT_SETTID) if (put_user(p->pid, parent_tidptr)) @@ -1133,10 +1126,6 @@ static struct task_struct *copy_process(unsigned long clone_flags, p->blocked_on = NULL; /* not blocked yet */ #endif - p->tgid = p->pid; - if (clone_flags & CLONE_THREAD) - p->tgid = current->tgid; - if ((retval = security_task_alloc(p))) goto bad_fork_cleanup_policy; if ((retval = audit_alloc(p))) @@ -1162,6 +1151,18 @@ static struct task_struct *copy_process(unsigned long clone_flags, if (retval) goto bad_fork_cleanup_namespaces; + if (pid != &init_struct_pid) { + retval = -ENOMEM; + pid = alloc_pid(task_active_pid_ns(p)); + if (!pid) + goto bad_fork_cleanup_namespaces; + } + + p->pid = pid_nr(pid); + p->tgid = p->pid; + if (clone_flags & CLONE_THREAD) + p->tgid = current->tgid; + p->set_child_tid = (clone_flags & CLONE_CHILD_SETTID) ? child_tidptr : NULL; /* * Clear TID on mm_release()? @@ -1259,7 +1260,7 @@ static struct task_struct *copy_process(unsigned long clone_flags, spin_unlock(¤t->sighand->siglock); write_unlock_irq(&tasklist_lock); retval = -ERESTARTNOINTR; - goto bad_fork_cleanup_namespaces; + goto bad_fork_free_pid; } if (clone_flags & CLONE_THREAD) { @@ -1308,6 +1309,9 @@ static struct task_struct *copy_process(unsigned long clone_flags, cgroup_post_fork(p); return p; +bad_fork_free_pid: + if (pid != &init_struct_pid) + free_pid(pid); bad_fork_cleanup_namespaces: exit_task_namespaces(p); bad_fork_cleanup_keys: @@ -1337,9 +1341,6 @@ bad_fork_cleanup_cgroup: cgroup_exit(p, cgroup_callbacks_done); bad_fork_cleanup_delays_binfmt: delayacct_tsk_free(p); - if (pid != &init_struct_pid) - free_pid(pid); -bad_fork_put_binfmt_module: if (p->binfmt) module_put(p->binfmt->module); bad_fork_cleanup_put_domain: -- 2.20.1