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authorEric Paris <eparis@redhat.com>2009-02-12 14:50:11 -0500
committerJames Morris <jmorris@namei.org>2009-02-14 09:22:34 +1100
commita5dda683328f99c781f92c66cc52ffc0639bef58 (patch)
tree2432f51e505fd9242f7081d5bf4e21ff322b73d6 /security
parent4cb912f1d1447077160ace9ce3b3a10696dd74e5 (diff)
downloadlinux-linaro-stable-a5dda683328f99c781f92c66cc52ffc0639bef58.tar.gz
SELinux: check seqno when updating an avc_node
The avc update node callbacks do not check the seqno of the caller with the seqno of the node found. It is possible that a policy change could happen (although almost impossibly unlikely) in which a permissive or permissive_domain decision is not valid for the entry found. Simply pass and check that the seqno of the caller and the seqno of the node found match. Signed-off-by: Eric Paris <eparis@redhat.com> Acked-by: Stephen Smalley <sds@tycho.nsa.gov> Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'security')
-rw-r--r--security/selinux/avc.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/security/selinux/avc.c b/security/selinux/avc.c
index eb41f43e2772..0d00f4874f32 100644
--- a/security/selinux/avc.c
+++ b/security/selinux/avc.c
@@ -742,13 +742,15 @@ static inline int avc_sidcmp(u32 x, u32 y)
* @event : Updating event
* @perms : Permission mask bits
* @ssid,@tsid,@tclass : identifier of an AVC entry
+ * @seqno : sequence number when decision was made
*
* if a valid AVC entry doesn't exist,this function returns -ENOENT.
* if kmalloc() called internal returns NULL, this function returns -ENOMEM.
* otherwise, this function update the AVC entry. The original AVC-entry object
* will release later by RCU.
*/
-static int avc_update_node(u32 event, u32 perms, u32 ssid, u32 tsid, u16 tclass)
+static int avc_update_node(u32 event, u32 perms, u32 ssid, u32 tsid, u16 tclass,
+ u32 seqno)
{
int hvalue, rc = 0;
unsigned long flag;
@@ -767,7 +769,8 @@ static int avc_update_node(u32 event, u32 perms, u32 ssid, u32 tsid, u16 tclass)
list_for_each_entry(pos, &avc_cache.slots[hvalue], list) {
if (ssid == pos->ae.ssid &&
tsid == pos->ae.tsid &&
- tclass == pos->ae.tclass){
+ tclass == pos->ae.tclass &&
+ seqno == pos->ae.avd.seqno){
orig = pos;
break;
}
@@ -908,7 +911,7 @@ int avc_has_perm_noaudit(u32 ssid, u32 tsid,
rc = -EACCES;
else if (!selinux_enforcing || security_permissive_sid(ssid))
avc_update_node(AVC_CALLBACK_GRANT, requested, ssid,
- tsid, tclass);
+ tsid, tclass, p_ae->avd.seqno);
else
rc = -EACCES;
}