From 22df4adb049a5cbb340dd935f5bbfa1ab3947562 Mon Sep 17 00:00:00 2001
From: Stephen Smalley <sds@tycho.nsa.gov>
Date: Mon, 9 Jun 2008 16:03:56 -0400
Subject: [PATCH] selinux: change handling of invalid classes (Was: Re:
2.6.26-rc5-mm1 selinux whine)
On Mon, 2008-06-09 at 01:24 -0700, Andrew Morton wrote:
> Getting a few of these with FC5:
>
> SELinux: context_struct_compute_av: unrecognized class 69
> SELinux: context_struct_compute_av: unrecognized class 69
>
> one came out when I logged in.
>
> No other symptoms, yet.
Change handling of invalid classes by SELinux, reporting class values
unknown to the kernel as errors (w/ ratelimit applied) and handling
class values unknown to policy as normal denials.
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
Acked-by: Eric Paris <eparis@redhat.com>
Signed-off-by: James Morris <jmorris@namei.org>
---
security/selinux/ss/services.c | 16 +++++++++++++---
1 file changed, 13 insertions(+), 3 deletions(-)
diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c
index 543fd0f31b33..04c0b70c8012 100644
--- a/security/selinux/ss/services.c
+++ b/security/selinux/ss/services.c
@@ -407,9 +407,19 @@ static int context_struct_compute_av(struct context *scontext,
return 0;
inval_class:
- printk(KERN_ERR "SELinux: %s: unrecognized class %d\n", __func__,
- tclass);
- return -EINVAL;
+ if (!tclass || tclass > kdefs->cts_len ||
+ !kdefs->class_to_string[tclass]) {
+ if (printk_ratelimit())
+ printk(KERN_ERR "SELinux: %s: unrecognized class %d\n",
+ __func__, tclass);
+ return -EINVAL;
+ }
+
+ /*
+ * Known to the kernel, but not to the policy.
+ * Handle as a denial (allowed is 0).
+ */
+ return 0;
}
/*