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authorJosé Pekkarinen <jose.pekkarinen@nokia.com>2016-04-11 10:41:07 +0300
committerJosé Pekkarinen <jose.pekkarinen@nokia.com>2016-04-13 08:17:18 +0300
commite09b41010ba33a20a87472ee821fa407a5b8da36 (patch)
treed10dc367189862e7ca5c592f033dc3726e1df4e3 /kernel/security/smack/smack_access.c
parentf93b97fd65072de626c074dbe099a1fff05ce060 (diff)
These changes are the raw update to linux-4.4.6-rt14. Kernel sources
are taken from kernel.org, and rt patch from the rt wiki download page. During the rebasing, the following patch collided: Force tick interrupt and get rid of softirq magic(I70131fb85). Collisions have been removed because its logic was found on the source already. Change-Id: I7f57a4081d9deaa0d9ccfc41a6c8daccdee3b769 Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>
Diffstat (limited to 'kernel/security/smack/smack_access.c')
-rw-r--r--kernel/security/smack/smack_access.c74
1 files changed, 63 insertions, 11 deletions
diff --git a/kernel/security/smack/smack_access.c b/kernel/security/smack/smack_access.c
index 0f410fc56..a283f9e79 100644
--- a/kernel/security/smack/smack_access.c
+++ b/kernel/security/smack/smack_access.c
@@ -425,7 +425,7 @@ void smk_insert_entry(struct smack_known *skp)
* @string: a text string that might be a Smack label
*
* Returns a pointer to the entry in the label list that
- * matches the passed string.
+ * matches the passed string or NULL if not found.
*/
struct smack_known *smk_find_entry(const char *string)
{
@@ -448,7 +448,7 @@ struct smack_known *smk_find_entry(const char *string)
* @string: a text string that might contain a Smack label
* @len: the maximum size, or zero if it is NULL terminated.
*
- * Returns a pointer to the clean label, or NULL
+ * Returns a pointer to the clean label or an error code.
*/
char *smk_parse_smack(const char *string, int len)
{
@@ -464,7 +464,7 @@ char *smk_parse_smack(const char *string, int len)
* including /smack/cipso and /smack/cipso2
*/
if (string[0] == '-')
- return NULL;
+ return ERR_PTR(-EINVAL);
for (i = 0; i < len; i++)
if (string[i] > '~' || string[i] <= ' ' || string[i] == '/' ||
@@ -472,11 +472,13 @@ char *smk_parse_smack(const char *string, int len)
break;
if (i == 0 || i >= SMK_LONGLABEL)
- return NULL;
+ return ERR_PTR(-EINVAL);
smack = kzalloc(i + 1, GFP_KERNEL);
- if (smack != NULL)
- strncpy(smack, string, i);
+ if (smack == NULL)
+ return ERR_PTR(-ENOMEM);
+
+ strncpy(smack, string, i);
return smack;
}
@@ -523,7 +525,8 @@ int smk_netlbl_mls(int level, char *catset, struct netlbl_lsm_secattr *sap,
* @len: the maximum size, or zero if it is NULL terminated.
*
* Returns a pointer to the entry in the label list that
- * matches the passed string, adding it if necessary.
+ * matches the passed string, adding it if necessary,
+ * or an error code.
*/
struct smack_known *smk_import_entry(const char *string, int len)
{
@@ -533,8 +536,8 @@ struct smack_known *smk_import_entry(const char *string, int len)
int rc;
smack = smk_parse_smack(string, len);
- if (smack == NULL)
- return NULL;
+ if (IS_ERR(smack))
+ return ERR_CAST(smack);
mutex_lock(&smack_known_lock);
@@ -543,8 +546,10 @@ struct smack_known *smk_import_entry(const char *string, int len)
goto freeout;
skp = kzalloc(sizeof(*skp), GFP_KERNEL);
- if (skp == NULL)
+ if (skp == NULL) {
+ skp = ERR_PTR(-ENOMEM);
goto freeout;
+ }
skp->smk_known = smack;
skp->smk_secid = smack_next_secid++;
@@ -577,7 +582,7 @@ struct smack_known *smk_import_entry(const char *string, int len)
* smk_netlbl_mls failed.
*/
kfree(skp);
- skp = NULL;
+ skp = ERR_PTR(rc);
freeout:
kfree(smack);
unlockout:
@@ -612,3 +617,50 @@ struct smack_known *smack_from_secid(const u32 secid)
rcu_read_unlock();
return &smack_known_invalid;
}
+
+/*
+ * Unless a process is running with one of these labels
+ * even having CAP_MAC_OVERRIDE isn't enough to grant
+ * privilege to violate MAC policy. If no labels are
+ * designated (the empty list case) capabilities apply to
+ * everyone.
+ */
+LIST_HEAD(smack_onlycap_list);
+DEFINE_MUTEX(smack_onlycap_lock);
+
+/*
+ * Is the task privileged and allowed to be privileged
+ * by the onlycap rule.
+ *
+ * Returns 1 if the task is allowed to be privileged, 0 if it's not.
+ */
+int smack_privileged(int cap)
+{
+ struct smack_known *skp = smk_of_current();
+ struct smack_known_list_elem *sklep;
+
+ /*
+ * All kernel tasks are privileged
+ */
+ if (unlikely(current->flags & PF_KTHREAD))
+ return 1;
+
+ if (!capable(cap))
+ return 0;
+
+ rcu_read_lock();
+ if (list_empty(&smack_onlycap_list)) {
+ rcu_read_unlock();
+ return 1;
+ }
+
+ list_for_each_entry_rcu(sklep, &smack_onlycap_list, list) {
+ if (sklep->smk_label == skp) {
+ rcu_read_unlock();
+ return 1;
+ }
+ }
+ rcu_read_unlock();
+
+ return 0;
+}