linux-kernel - Re: [PATCH] Don't spam kernel log with EKEYEXPIRED and EACCESS errors

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1321641010.2653.10.camel@lade.trondhjem.org>
Date:	Fri, 18 Nov 2011 20:30:10 +0200
From:	Trond Myklebust <Trond.Myklebust@...app.com>
To:	John Hughes <john@...va.COM>
Cc:	linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Don't spam kernel log with EKEYEXPIRED and EACCESS
 errors

On Fri, 2011-11-18 at 17:20 +0100, John Hughes wrote: 
> Don't write anything to the log if a user Kerberos ticket expires or is missing,
> these are not kernel problems.
> 
> Signed-off-by: John Hughes<john@...va.com>
> 
> diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
> index 39914be..18897cb 100644
> --- a/fs/nfs/nfs4state.c
> +++ b/fs/nfs/nfs4state.c
> @@ -1339,14 +1339,6 @@ static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp)
>   	nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce);
>   }
> 
> -static void nfs4_warn_keyexpired(const char *s)
> -{
> -	printk_ratelimited(KERN_WARNING "Error: state manager"
> -			" encountered RPCSEC_GSS session"
> -			" expired against NFSv4 server %s.\n",
> -			s);
> -}

NACK. This is useful.

> -
>   static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
>   {
>   	switch (error) {
> @@ -1378,7 +1370,6 @@ static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
>   			return 0;
>   		case -EKEYEXPIRED:
>   			/* Nothing we can do */
> -			nfs4_warn_keyexpired(clp->cl_hostname);
>   			return 0;
>   	}
>   	return error;
> @@ -1620,7 +1611,6 @@ static void nfs4_set_lease_expired(struct nfs_client *clp, int status)
>   		break;
> 
>   	case -EKEYEXPIRED:
> -		nfs4_warn_keyexpired(clp->cl_hostname);

NACK. This means that the server can't even recover it's lease. It
shouldn't even trigger if you install a machine credential.

> 	case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery
>   				 * in nfs4_exchange_id */
>   	default:
> @@ -1728,8 +1718,9 @@ static void nfs4_state_manager(struct nfs_client *clp)
>   	} while (atomic_read(&clp->cl_count)>  1);
>   	return;
>   out_error:
> -	printk(KERN_WARNING "Error: state manager failed on NFSv4 server %s"
> -			" with error %d\n", clp->cl_hostname, -status);
> +	if (status != -EACCESS)
> +		printk(KERN_WARNING "Error: state manager failed on NFSv4 server %s"
> +				" with error %d\n", clp->cl_hostname, -status);

Obviously not even compile tested...

> 	nfs4_end_drain_session(clp);
>   	nfs4_clear_state_manager_bit(clp);
>   }
> 
> 

-- 
Trond Myklebust
Linux NFS client maintainer

NetApp
Trond.Myklebust@...app.com
www.netapp.com

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/