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authorKaiGai Kohei <kaigai@ak.jp.nec.com>2009-04-01 10:07:57 +0900
committerJames Morris <jmorris@namei.org>2009-04-02 09:23:45 +1100
commit8a6f83afd0c5355db6d11394a798e94950306239 (patch)
treef7cb84de87f67eeba0dd68681907696f8a5774d1 /security/selinux/ss
parentc31f403de62415c738ddc9e673cf8e722c82f861 (diff)
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Permissive domain in userspace object manager
This patch enables applications to handle permissive domain correctly. Since the v2.6.26 kernel, SELinux has supported an idea of permissive domain which allows certain processes to work as if permissive mode, even if the global setting is enforcing mode. However, we don't have an application program interface to inform what domains are permissive one, and what domains are not. It means applications focuses on SELinux (XACE/SELinux, SE-PostgreSQL and so on) cannot handle permissive domain correctly. This patch add the sixth field (flags) on the reply of the /selinux/access interface which is used to make an access control decision from userspace. If the first bit of the flags field is positive, it means the required access control decision is on permissive domain, so application should allow any required actions, as the kernel doing. This patch also has a side benefit. The av_decision.flags is set at context_struct_compute_av(). It enables to check required permissions without read_lock(&policy_rwlock). Signed-off-by: KaiGai Kohei <kaigai@ak.jp.nec.com> Acked-by: Stephen Smalley <sds@tycho.nsa.gov> Acked-by: Eric Paris <eparis@redhat.com> -- security/selinux/avc.c | 2 +- security/selinux/include/security.h | 4 +++- security/selinux/selinuxfs.c | 4 ++-- security/selinux/ss/services.c | 30 +++++------------------------- 4 files changed, 11 insertions(+), 29 deletions(-) Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'security/selinux/ss')
-rw-r--r--security/selinux/ss/services.c30
1 files changed, 5 insertions, 25 deletions
diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c
index deeec6c013a..500e6f78e11 100644
--- a/security/selinux/ss/services.c
+++ b/security/selinux/ss/services.c
@@ -410,6 +410,7 @@ static int context_struct_compute_av(struct context *scontext,
avd->auditallow = 0;
avd->auditdeny = 0xffffffff;
avd->seqno = latest_granting;
+ avd->flags = 0;
/*
* Check for all the invalid cases.
@@ -528,31 +529,6 @@ inval_class:
return 0;
}
-/*
- * Given a sid find if the type has the permissive flag set
- */
-int security_permissive_sid(u32 sid)
-{
- struct context *context;
- u32 type;
- int rc;
-
- read_lock(&policy_rwlock);
-
- context = sidtab_search(&sidtab, sid);
- BUG_ON(!context);
-
- type = context->type;
- /*
- * we are intentionally using type here, not type-1, the 0th bit may
- * someday indicate that we are globally setting permissive in policy.
- */
- rc = ebitmap_get_bit(&policydb.permissive_map, type);
-
- read_unlock(&policy_rwlock);
- return rc;
-}
-
static int security_validtrans_handle_fail(struct context *ocontext,
struct context *ncontext,
struct context *tcontext,
@@ -767,6 +743,10 @@ int security_compute_av(u32 ssid,
rc = context_struct_compute_av(scontext, tcontext, tclass,
requested, avd);
+
+ /* permissive domain? */
+ if (ebitmap_get_bit(&policydb.permissive_map, scontext->type))
+ avd->flags |= AVD_FLAGS_PERMISSIVE;
out:
read_unlock(&policy_rwlock);
return rc;