selinux: add type_transition with name extension support for selinuxfs
The attached patch allows /selinux/create takes optional 4th argument
to support TYPE_TRANSITION with name extension for userspace object
managers.
If 4th argument is not supplied, it shall perform as existing kernel.
In fact, the regression test of SE-PostgreSQL works well on the patched
kernel.
Thanks,
Signed-off-by: KaiGai Kohei <kohei.kaigai@eu.nec.com>
[manually verify fuzz was not an issue, and it wasn't: eparis]
Signed-off-by: Eric Paris <eparis@redhat.com>
diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c
index 03f7a47..39d7321 100644
--- a/security/selinux/ss/services.c
+++ b/security/selinux/ss/services.c
@@ -1360,14 +1360,14 @@
static void filename_compute_type(struct policydb *p, struct context *newcontext,
u32 scon, u32 tcon, u16 tclass,
- const struct qstr *qstr)
+ const char *objname)
{
struct filename_trans *ft;
for (ft = p->filename_trans; ft; ft = ft->next) {
if (ft->stype == scon &&
ft->ttype == tcon &&
ft->tclass == tclass &&
- !strcmp(ft->name, qstr->name)) {
+ !strcmp(ft->name, objname)) {
newcontext->type = ft->otype;
return;
}
@@ -1378,7 +1378,7 @@
u32 tsid,
u16 orig_tclass,
u32 specified,
- const struct qstr *qstr,
+ const char *objname,
u32 *out_sid,
bool kern)
{
@@ -1479,9 +1479,9 @@
}
/* if we have a qstr this is a file trans check so check those rules */
- if (qstr)
+ if (objname)
filename_compute_type(&policydb, &newcontext, scontext->type,
- tcontext->type, tclass, qstr);
+ tcontext->type, tclass, objname);
/* Check for class-specific changes. */
if (specified & AVTAB_TRANSITION) {
@@ -1539,13 +1539,14 @@
const struct qstr *qstr, u32 *out_sid)
{
return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION,
- qstr, out_sid, true);
+ qstr ? qstr->name : NULL, out_sid, true);
}
-int security_transition_sid_user(u32 ssid, u32 tsid, u16 tclass, u32 *out_sid)
+int security_transition_sid_user(u32 ssid, u32 tsid, u16 tclass,
+ const char *objname, u32 *out_sid)
{
return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION,
- NULL, out_sid, false);
+ objname, out_sid, false);
}
/**