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userns xt_recent: Specify the owner/group of ip_list_perms in the initial user namespace 

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@netfilter.org>
Cc: Patrick McHardy <kaber@trash.net>
Cc: Jan Engelhardt <jengelh@medozas.de>
Acked-by: David S. Miller <davem@davemloft.net>
Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
hifive-unleashed-5.1
Eric W. Biederman 2012-05-25 16:26:52 -06:00
parent 8c6e2a941a
commit da7428080a
2 changed files with 11 additions and 3 deletions
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1
init/Kconfig
View File

@ -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

13
net/netfilter/xt_recent.c
View File

@ -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);