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[74.136.172.82]) by smtp.gmail.com with ESMTPSA id m205sm1874679qke.2.2021.05.13.01.28.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 13 May 2021 01:28:48 -0700 (PDT) From: Jonathon Reinhart To: stable@vger.kernel.org Cc: Jonathon Reinhart , Greg KH , "David S. Miller" , Florian Westphal , netdev@vger.kernel.org Subject: [PATCH] netfilter: conntrack: Make global sysctls readonly in non-init netns Date: Thu, 13 May 2021 04:28:35 -0400 Message-Id: <20210513082835.18854-1-jonathon.reinhart@gmail.com> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org commit 2671fa4dc0109d3fb581bc3078fdf17b5d9080f6 upstream. These sysctls point to global variables: - [0] "nf_conntrack_max" (&nf_conntrack_max) - [2] "nf_conntrack_buckets" (&nf_conntrack_htable_size_user) - [5] "nf_conntrack_expect_max" (&nf_ct_expect_max) 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. This patch is necessarily different from the upstream patch due to the heavy refactoring which took place since 4.19: d0febd81ae77 ("netfilter: conntrack: re-visit sysctls in unprivileged namespaces") b884fa461776 ("netfilter: conntrack: unify sysctl handling") 4a65798a9408 ("netfilter: conntrack: add mnemonics for sysctl table") Signed-off-by: Jonathon Reinhart --- Upstream commit 2671fa4dc010 was already applied to the 5.10, 5.11, and 5.12 trees. This was tested on 4.19.190, so please apply to 4.19.y. It should also apply to: - 4.14.y - 4.9.y Note that 5.4.y would require a slightly different patch that looks more like 2671fa4dc010. --- 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 2e3ae494f369..da0c9fa381d2 100644 --- a/net/netfilter/nf_conntrack_standalone.c +++ b/net/netfilter/nf_conntrack_standalone.c @@ -594,8 +594,11 @@ 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) -- 2.20.1