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-rw-r--r--net/dns_resolver/dns_key.c12
-rw-r--r--net/dns_resolver/dns_query.c15
2 files changed, 22 insertions, 5 deletions
diff --git a/net/dns_resolver/dns_key.c b/net/dns_resolver/dns_key.c
index 3e1a90669006..6b201531b165 100644
--- a/net/dns_resolver/dns_key.c
+++ b/net/dns_resolver/dns_key.c
@@ -46,6 +46,15 @@ const struct cred *dns_resolver_cache;
#define DNS_ERRORNO_OPTION "dnserror"
+static struct key_acl dns_keyring_acl = {
+ .usage = REFCOUNT_INIT(1),
+ .nr_ace = 2,
+ .aces = {
+ KEY_POSSESSOR_ACE(KEY_ACE_SEARCH | KEY_ACE_WRITE),
+ KEY_OWNER_ACE(KEY_ACE_VIEW | KEY_ACE_READ | KEY_ACE_CLEAR),
+ }
+};
+
/*
* Preparse instantiation data for a dns_resolver key.
*
@@ -343,8 +352,7 @@ static int __init init_dns_resolver(void)
keyring = keyring_alloc(".dns_resolver",
GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, cred,
- (KEY_POS_ALL & ~KEY_POS_SETATTR) |
- KEY_USR_VIEW | KEY_USR_READ,
+ &dns_keyring_acl,
KEY_ALLOC_NOT_IN_QUOTA, NULL, NULL);
if (IS_ERR(keyring)) {
ret = PTR_ERR(keyring);
diff --git a/net/dns_resolver/dns_query.c b/net/dns_resolver/dns_query.c
index cab4e0df924f..236baf2bfa4c 100644
--- a/net/dns_resolver/dns_query.c
+++ b/net/dns_resolver/dns_query.c
@@ -47,6 +47,16 @@
#include "internal.h"
+static struct key_acl dns_key_acl = {
+ .usage = REFCOUNT_INIT(1),
+ .nr_ace = 2,
+ .possessor_viewable = true,
+ .aces = {
+ KEY_POSSESSOR_ACE(KEY_ACE_VIEW | KEY_ACE_SEARCH | KEY_ACE_READ),
+ KEY_OWNER_ACE(KEY_ACE_VIEW | KEY_ACE_INVAL),
+ }
+};
+
/**
* dns_query - Query the DNS
* @net: The network namespace to operate in.
@@ -125,7 +135,8 @@ int dns_query(struct net *net,
* add_key() to preinstall malicious redirections
*/
saved_cred = override_creds(dns_resolver_cache);
- rkey = request_key_net(&key_type_dns_resolver, desc, net, options);
+ rkey = request_key_net(&key_type_dns_resolver, desc, net, options,
+ &dns_key_acl);
revert_creds(saved_cred);
kfree(desc);
if (IS_ERR(rkey)) {
@@ -135,8 +146,6 @@ int dns_query(struct net *net,
down_read(&rkey->sem);
set_bit(KEY_FLAG_ROOT_CAN_INVAL, &rkey->flags);
- rkey->perm |= KEY_USR_VIEW;
-
ret = key_validate(rkey);
if (ret < 0)
goto put;