linux-kernel - [PATCH] userns: use marco instead of magic number for max userns level

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Message-ID: <1409895565-26572-1-git-send-email-chenhanxiao@cn.fujitsu.com>
Date:	Fri, 5 Sep 2014 13:39:25 +0800
From:	Chen Hanxiao <chenhanxiao@...fujitsu.com>
To:	<containers@...ts.linux-foundation.org>,
	<linux-kernel@...r.kernel.org>
CC:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Serge Hallyn <serge.hallyn@...ntu.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Fabian Frederick <fabf@...net.be>
Subject: [PATCH] userns: use marco instead of magic number for max userns level

Use marco instead of magic number
for max user namespace level.

Signed-off-by: Chen Hanxiao <chenhanxiao@...fujitsu.com>
---
 kernel/user_namespace.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c
index aa312b0..5435489 100644
--- a/kernel/user_namespace.c
+++ b/kernel/user_namespace.c
@@ -47,6 +47,8 @@ static void set_cred_user_ns(struct cred *cred, struct user_namespace *user_ns)
 	cred->user_ns = user_ns;
 }
 
+#define MAX_USER_NS_LEVEL 32
+
 /*
  * Create a new user namespace, deriving the creator from the user in the
  * passed credentials, and replacing that user with the new root user for the
@@ -62,7 +64,7 @@ int create_user_ns(struct cred *new)
 	kgid_t group = new->egid;
 	int ret;
 
-	if (parent_ns->level > 32)
+	if (parent_ns->level > MAX_USER_NS_LEVEL)
 		return -EUSERS;
 
 	/*
-- 
1.9.0

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