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selinux: change handling of invalid classes (Was: Re: 2.6.26-rc5-mm1 selinux whine)

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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>
This commit is contained in:
Stephen Smalley 2008-06-09 16:03:56 -04:00 committed by James Morris
parent 89abd0acf0
commit 22df4adb04
1 changed files with 13 additions and 3 deletions
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16
security/selinux/ss/services.c
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@ -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;
}
/*