netdev - [PATCH 10/11] SUNRPC: allow debug flags modifications only from init

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Date:	Wed, 14 Dec 2011 14:46:02 +0300
From:	Stanislav Kinsbursky <skinsbursky@...allels.com>
To:	Trond.Myklebust@...app.com
Cc:	linux-nfs@...r.kernel.org, xemul@...allels.com, neilb@...e.de,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	jbottomley@...allels.com, bfields@...ldses.org,
	davem@...emloft.net, devel@...nvz.org
Subject: [PATCH 10/11] SUNRPC: allow debug flags modifications only from
 init_net

Debug flags are global (i.e. fo all namespaces). So probably, it is better to
restrict write access and allow it only to processes with "init_net" network
namespace.

Signed-off-by: Stanislav Kinsbursky <skinsbursky@...allels.com>

---
 net/sunrpc/sysctl.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/net/sunrpc/sysctl.c b/net/sunrpc/sysctl.c
index eda80cf..224b075 100644
--- a/net/sunrpc/sysctl.c
+++ b/net/sunrpc/sysctl.c
@@ -156,7 +156,8 @@ proc_dodebug(ctl_table *table, int write,
 			return -EINVAL;
 		while (left && isspace(*s))
 			left--, s++;
-		*(unsigned int *) table->data = value;
+		if (net_eq(current->nsproxy->net_ns, &init_net))
+			*(unsigned int *) table->data = value;
 		/* Display the RPC tasks on writing to rpc_debug */
 		if (strcmp(table->procname, "rpc_debug") == 0)
 			rpc_show_tasks(&init_net);

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