mm/migrate: avoid possible unnecessary process right check in kernel_move_pages()

There is no need to check if this process has the right to modify the
specified process when they are same.  And we could also skip the security
hook call if a process is modifying its own pages.  Add helper function to
handle these.

Suggested-by: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Hongxiang Lou <louhongxiang@huawei.com>
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Christopher Lameter <cl@linux.com>
Link: https://lkml.kernel.org/r/20200819083331.19012-1-linmiaohe@huawei.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/migrate.c

@@ -1864,6 +1864,53 @@ static int do_pages_stat(struct mm_struct *mm, unsigned long nr_pages,
 	return nr_pages ? -EFAULT : 0;
 }
 
+static struct mm_struct *find_mm_struct(pid_t pid, nodemask_t *mem_nodes)
+{
+	struct task_struct *task;
+	struct mm_struct *mm;
+
+	/*
+	 * There is no need to check if current process has the right to modify
+	 * the specified process when they are same.
+	 */
+	if (!pid) {
+		mmget(current->mm);
+		*mem_nodes = cpuset_mems_allowed(current);
+		return current->mm;
+	}
+
+	/* Find the mm_struct */
+	rcu_read_lock();
+	task = find_task_by_vpid(pid);
+	if (!task) {
+		rcu_read_unlock();
+		return ERR_PTR(-ESRCH);
+	}
+	get_task_struct(task);
+
+	/*
+	 * Check if this process has the right to modify the specified
+	 * process. Use the regular "ptrace_may_access()" checks.
+	 */
+	if (!ptrace_may_access(task, PTRACE_MODE_READ_REALCREDS)) {
+		rcu_read_unlock();
+		mm = ERR_PTR(-EPERM);
+		goto out;
+	}
+	rcu_read_unlock();
+
+	mm = ERR_PTR(security_task_movememory(task));
+	if (IS_ERR(mm))
+		goto out;
+	*mem_nodes = cpuset_mems_allowed(task);
+	mm = get_task_mm(task);
+out:
+	put_task_struct(task);
+	if (!mm)
+		mm = ERR_PTR(-EINVAL);
+	return mm;
+}
+
 /*
  * Move a list of pages in the address space of the currently executing
  * process.
@@ -1873,7 +1920,6 @@ static int kernel_move_pages(pid_t pid, unsigned long nr_pages,
 			     const int __user *nodes,
 			     int __user *status, int flags)
 {
-	struct task_struct *task;
 	struct mm_struct *mm;
 	int err;
 	nodemask_t task_nodes;
@@ -1885,36 +1931,9 @@ static int kernel_move_pages(pid_t pid, unsigned long nr_pages,
 	if ((flags & MPOL_MF_MOVE_ALL) && !capable(CAP_SYS_NICE))
 		return -EPERM;
 
-	/* Find the mm_struct */
-	rcu_read_lock();
-	task = pid ? find_task_by_vpid(pid) : current;
-	if (!task) {
-		rcu_read_unlock();
-		return -ESRCH;
-	}
-	get_task_struct(task);
-
-	/*
-	 * Check if this process has the right to modify the specified
-	 * process. Use the regular "ptrace_may_access()" checks.
-	 */
-	if (!ptrace_may_access(task, PTRACE_MODE_READ_REALCREDS)) {
-		rcu_read_unlock();
-		err = -EPERM;
-		goto out;
-	}
-	rcu_read_unlock();
-
- 	err = security_task_movememory(task);
- 	if (err)
-		goto out;
-
-	task_nodes = cpuset_mems_allowed(task);
-	mm = get_task_mm(task);
-	put_task_struct(task);
-
-	if (!mm)
-		return -EINVAL;
+	mm = find_mm_struct(pid, &task_nodes);
+	if (IS_ERR(mm))
+		return PTR_ERR(mm);
 
 	if (nodes)
 		err = do_pages_move(mm, task_nodes, nr_pages, pages,
@@ -1924,10 +1943,6 @@ static int kernel_move_pages(pid_t pid, unsigned long nr_pages,
 
 	mmput(mm);
 	return err;
-
-out:
-	put_task_struct(task);
-	return err;
 }
 
 SYSCALL_DEFINE6(move_pages, pid_t, pid, unsigned long, nr_pages,