Re: [PATCH net-next 2/2] net:add socket option for low latency polling

From: Eliezer Tamir
Date: Wed Jun 12 2013 - 02:39:24 EST

On 11/06/2013 23:24, Ben Hutchings wrote:
On Tue, 2013-06-11 at 17:24 +0300, Eliezer Tamir wrote:
adds a socket option for low latency polling.
This allows overriding the global sysctl value with a per-socket one.
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -913,6 +913,23 @@ set_rcvbuf:
sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);

+ case SO_LL:
+ if (!capable(CAP_NET_ADMIN))
+ ret = -EACCES;

Failed capability checks normally result in EPERM whereas EACCES usually
results from a file permission/ACL/label check.


Perhaps unprivileged users should be allowed to set a value as long as
it's less than or equal to the global value?

I thought of allowing to disable even if you are not privileged, but this sounds better.

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