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| author | Eric W. Biederman <ebiederm@xmission.com> | 2012-11-16 03:02:59 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-11-18 20:30:55 -0500 |
| commit | 464dc801c76aa0db88e16e8f5f47c6879858b9b2 (patch) | |
| tree | cfaf0f43f4ce50669f07031ec42062b4c9a7f985 /net/xfrm/xfrm_sysctl.c | |
| parent | 73f7ef435934e952c1d70d83d69921ea5d1f6bd4 (diff) | |
| download | lwn-464dc801c76aa0db88e16e8f5f47c6879858b9b2.tar.gz lwn-464dc801c76aa0db88e16e8f5f47c6879858b9b2.zip | |
net: Don't export sysctls to unprivileged users
In preparation for supporting the creation of network namespaces
by unprivileged users, modify all of the per net sysctl exports
and refuse to allow them to unprivileged users.
This makes it safe for unprivileged users in general to access
per net sysctls, and allows sysctls to be exported to unprivileged
users on an individual basis as they are deemed safe.
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/xfrm/xfrm_sysctl.c')
| -rw-r--r-- | net/xfrm/xfrm_sysctl.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/net/xfrm/xfrm_sysctl.c b/net/xfrm/xfrm_sysctl.c index 380976f74c4c..05a6e3d9c258 100644 --- a/net/xfrm/xfrm_sysctl.c +++ b/net/xfrm/xfrm_sysctl.c @@ -54,6 +54,10 @@ int __net_init xfrm_sysctl_init(struct net *net) table[2].data = &net->xfrm.sysctl_larval_drop; table[3].data = &net->xfrm.sysctl_acq_expires; + /* Don't export sysctls to unprivileged users */ + if (net->user_ns != &init_user_ns) + table[0].procname = NULL; + net->xfrm.sysctl_hdr = register_net_sysctl(net, "net/core", table); if (!net->xfrm.sysctl_hdr) goto out_register; |