AuxXxilium/linux_dsm_epyc7002
1
0
Fork 0
mirror of https://github.com/AuxXxilium/linux_dsm_epyc7002.git synced 2024-11-24 12:50:52 +07:00
Code Issues Actions Packages Projects Releases Wiki Activity

netfilter: conntrack: re-visit sysctls in unprivileged namespaces

Browse Source 
since commit b884fa4617 ("netfilter: conntrack: unify sysctl handling")
conntrack no longer exposes most of its sysctls (e.g. tcp timeouts
settings) to network namespaces that are not owned by the initial user
namespace.

This patch exposes all sysctls even if the namespace is unpriviliged.

compared to a 4.19 kernel, the newly visible and writeable sysctls are:
  net.netfilter.nf_conntrack_acct
  net.netfilter.nf_conntrack_timestamp
  .. to allow to enable accouting and timestamp extensions.

  net.netfilter.nf_conntrack_events
  .. to turn off conntrack event notifications.

  net.netfilter.nf_conntrack_checksum
  .. to disable checksum validation.

  net.netfilter.nf_conntrack_log_invalid
  .. to enable logging of packets deemed invalid by conntrack.

newly visible sysctls that are only exported as read-only:

  net.netfilter.nf_conntrack_count
  .. current number of conntrack entries living in this netns.

  net.netfilter.nf_conntrack_max
  .. global upperlimit (maximum size of the table).

  net.netfilter.nf_conntrack_buckets
  .. size of the conntrack table (hash buckets).

  net.netfilter.nf_conntrack_expect_max
  .. maximum number of permitted expectations in this netns.

  net.netfilter.nf_conntrack_helper
  .. conntrack helper auto assignment.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2020-03-11 20:52:01 +01:00 committed by Pablo Neira Ayuso
parent 339706bc21
commit d0febd81ae
1 changed files with 8 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
net/netfilter/nf_conntrack_standalone.c
View File

@ -1054,21 +1054,18 @@ static int nf_conntrack_standalone_init_sysctl(struct net *net)
nf_conntrack_standalone_init_dccp_sysctl(net, table);
nf_conntrack_standalone_init_gre_sysctl(net, table);
/* Don't export sysctls to unprivileged users */
/* Don't allow unprivileged users to alter certain sysctls */
if (net->user_ns != &init_user_ns) {
table[NF_SYSCTL_CT_MAX].procname = NULL;
table[NF_SYSCTL_CT_ACCT].procname = NULL;
table[NF_SYSCTL_CT_HELPER].procname = NULL;
#ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
table[NF_SYSCTL_CT_TIMESTAMP].procname = NULL;
#endif
table[NF_SYSCTL_CT_MAX].mode = 0444;
table[NF_SYSCTL_CT_EXPECT_MAX].mode = 0444;
table[NF_SYSCTL_CT_HELPER].mode = 0444;
#ifdef CONFIG_NF_CONNTRACK_EVENTS
table[NF_SYSCTL_CT_EVENTS].procname = NULL;
table[NF_SYSCTL_CT_EVENTS].mode = 0444;
#endif
}
if (!net_eq(&init_net, net))
table[NF_SYSCTL_CT_BUCKETS].mode = 0444;
} else if (!net_eq(&init_net, net)) {
table[NF_SYSCTL_CT_BUCKETS].mode = 0444;
}
net->ct.sysctl_header = register_net_sysctl(net, "net/netfilter", table);
if (!net->ct.sysctl_header)