linux-kernel - Re: SELinux change in 3.13 causes sync hang

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Date:	Tue, 10 Dec 2013 13:58:54 -0800
From:	Anand Avati <avati@...hat.com>
To:	Eric Paris <eparis@...hat.com>,
	Josh Boyer <jwboyer@...oraproject.org>
CC:	James Morris <jmorris@...ei.org>,
	Eric Sandeen <sandeen@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>
Subject: Re: SELinux change in 3.13 causes sync hang

On 12/10/13, 12:35 PM, Eric Paris wrote:
> On Tue, 2013-12-10 at 15:25 -0500, Eric Paris wrote:
>
>> I'll try to write a patch to fix that logic...
>
> Anand,
>
> How about something like (untested but it compiles):


Sorry, it took me a while to compare the committed patch and my original 
submission. The original patch did not have the subtype matching issue 
(but had a different issue) and it looks like this bug has come in the 
reworked/committed patch. I think the fix you have pasted below works.

Reviewed-by: Anand Avati <avati@...hat.com>

Thanks,
Avati

>
> diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c
> index ee470a0..2b437fc8 100644
> --- a/security/selinux/ss/services.c
> +++ b/security/selinux/ss/services.c
> @@ -2349,9 +2359,17 @@ int security_fs_use(struct super_block *sb)
>   		if (strncmp(fstype, c->u.name, baselen))
>   			continue;
>
> -		/* if there is no subtype, this is the one! */
> -		if (!subtype)
> -			break;
> +		/* current mount has no subtype */
> +		if (!subtype) {
> +			/*
> +			 * if there is no subtype in policy this is our match
> +			 * if there is a subtype in policy keep looking,
> +			 */
> +			if (baselen == strlen(c->u.name))
> +				break;
> +			else
> +				continue;
> +		}
>
>   		/* skip past the base in this entry */
>   		sub = c->u.name + baselen;
>
>

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