From: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
xt_recent creates a bunch of proc files and initializes their uid
and gids to the values of ip_list_uid and ip_list_gid. When
initialize those proc files convert those values to kuids so they
can continue to reside on the /proc inode.
Cc: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
Cc: Patrick McHardy <kaber@xxxxxxxxx>
Cc: Jan Engelhardt <jengelh@xxxxxxxxxx>
Acked-by: Serge Hallyn <serge.hallyn@xxxxxxxxxxxxx>
Signed-off-by: Eric W. Biederman <ebiederm@xxxxxxxxxxxx>
---
init/Kconfig | 1 -
net/netfilter/xt_recent.c | 13 +++++++++++--
2 files changed, 11 insertions(+), 3 deletions(-)
diff --git a/init/Kconfig b/init/Kconfig
index c8911eb..40f5020 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -944,7 +944,6 @@ config UIDGID_CONVERTED
# Networking
depends on NET_9P = n
depends on NETFILTER_XT_MATCH_OWNER = n
- depends on NETFILTER_XT_MATCH_RECENT = n
depends on AF_RXRPC = n
depends on NET_KEY = n
depends on DNS_RESOLVER = n
diff --git a/net/netfilter/xt_recent.c b/net/netfilter/xt_recent.c
index ae2ad1e..4635c9b 100644
--- a/net/netfilter/xt_recent.c
+++ b/net/netfilter/xt_recent.c
@@ -317,6 +317,8 @@ static int recent_mt_check(const struct xt_mtchk_param *par,
struct recent_table *t;
#ifdef CONFIG_PROC_FS
struct proc_dir_entry *pde;
+ kuid_t uid;
+ kgid_t gid;
#endif
unsigned int i;
int ret = -EINVAL;
@@ -372,6 +374,13 @@ static int recent_mt_check(const struct xt_mtchk_param *par,
for (i = 0; i < ip_list_hash_size; i++)
INIT_LIST_HEAD(&t->iphash[i]);
#ifdef CONFIG_PROC_FS
+ uid = make_kuid(&init_user_ns, ip_list_uid);
+ gid = make_kgid(&init_user_ns, ip_list_gid);
+ if (!uid_valid(uid) || !gid_valid(gid)) {
+ kfree(t);
+ ret = -EINVAL;
+ goto out;
+ }
pde = proc_create_data(t->name, ip_list_perms, recent_net->xt_recent,
&recent_mt_fops, t);
if (pde == NULL) {
@@ -379,8 +388,8 @@ static int recent_mt_check(const struct xt_mtchk_param *par,
ret = -ENOMEM;
goto out;
}
- pde->uid = ip_list_uid;
- pde->gid = ip_list_gid;
+ pde->uid = uid;
+ pde->gid = gid;
#endif
spin_lock_bh(&recent_lock);
list_add_tail(&t->list, &recent_net->tables);
--
1.7.5.4
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