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selinux: add type_transition with name extension support for selinuxfs

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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>
This commit is contained in:
Kohei Kaigai
2011-04-01 15:39:26 +01:00
committed by Eric Paris
parent 6bde95ce33
commit f50a3ec961
3 changed files with 26 additions and 13 deletions
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17
security/selinux/ss/services.c
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@ -1360,14 +1360,14 @@ out:
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 @@ static int security_compute_sid(u32 ssid,
u32 tsid,
u16 orig_tclass,
u32 specified,
const struct qstr *qstr,
const char *objname,
u32 *out_sid,
bool kern)
{
@ -1479,9 +1479,9 @@ static int security_compute_sid(u32 ssid,
}
/* 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 @@ int security_transition_sid(u32 ssid, u32 tsid, u16 tclass,
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);
}
/**