[10/11] SUNRPC: allow debug flags modifications only from init_net

Submitted by Stanislav Kinsbursky on Dec. 14, 2011, 11:46 a.m.

Details

Message ID 20111214104602.3991.91169.stgit@localhost6.localdomain6
State Not Applicable
Delegated to: David Miller
Headers show

Commit Message

Stanislav Kinsbursky Dec. 14, 2011, 11:46 a.m.
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@parallels.com>

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


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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);