From: Jonathon Reinhart
stable inclusion
from linux-4.19.191
commit 9b288479f7a901a14ce703938596438559d7df55
category: bugfix
issue: #I49DTU
CVE: CVE-2021-38209
--------------------------------
commit 2671fa4dc0109d3fb581bc3078fdf17b5d9080f6 upstream.
These sysctls point to global variables:
- NF_SYSCTL_CT_MAX (&nf_conntrack_max)
- NF_SYSCTL_CT_EXPECT_MAX (&nf_ct_expect_max)
- NF_SYSCTL_CT_BUCKETS (&nf_conntrack_htable_size_user)
Because their data pointers are not updated to point to per-netns
structures, they must be marked read-only in a non-init_net ns.
Otherwise, changes in any net namespace are reflected in (leaked into)
all other net namespaces. This problem has existed since the
introduction of net namespaces.
The current logic marks them read-only only if the net namespace is
owned by an unprivileged user (other than init_user_ns).
Commit d0febd81ae77 ("netfilter: conntrack: re-visit sysctls in
unprivileged namespaces") "exposes all sysctls even if the namespace is
unpriviliged." Since we need to mark them readonly in any case, we can
forego the unprivileged user check altogether.
Fixes: d0febd81ae77 ("netfilter: conntrack: re-visit sysctls in unprivileged namespaces")
Signed-off-by: Jonathon Reinhart
Signed-off-by: David S. Miller
Signed-off-by: Greg Kroah-Hartman
Signed-off-by: Yang Yingliang
Signed-off-by: Yu Changchun
---
net/netfilter/nf_conntrack_standalone.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/net/netfilter/nf_conntrack_standalone.c b/net/netfilter/nf_conntrack_standalone.c
index 4c94f3ba2ae4..0d9ce6bb08d2 100644
--- a/net/netfilter/nf_conntrack_standalone.c
+++ b/net/netfilter/nf_conntrack_standalone.c
@@ -590,8 +590,11 @@ static int nf_conntrack_standalone_init_sysctl(struct net *net)
if (net->user_ns != &init_user_ns)
table[0].procname = NULL;
- if (!net_eq(&init_net, net))
+ if (!net_eq(&init_net, net)) {
+ table[0].mode = 0444;
table[2].mode = 0444;
+ table[5].mode = 0444;
+ }
net->ct.sysctl_header = register_net_sysctl(net, "net/netfilter", table);
if (!net->ct.sysctl_header)
--
2.22.0
