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* [PATCH] svcrpc: fix potential GSSX_ACCEPT_SEC_CONTEXT decoding failures
@ 2015-04-28 20:29 Scott Mayhew
  2015-04-28 21:09 ` Simo Sorce
  0 siblings, 1 reply; 4+ messages in thread
From: Scott Mayhew @ 2015-04-28 20:29 UTC (permalink / raw)
  To: bfields; +Cc: linux-nfs

In an environment where the KDC is running Active Directory, the
exported composite name field returned in the context could be large
enough to span a page boundary.  Attaching a scratch buffer to the
decoding xdr_stream helps deal with those cases.

Signed-off-by: Scott Mayhew <smayhew@redhat.com>
---
 net/sunrpc/auth_gss/gss_rpc_xdr.c | 23 ++++++++++++++++-------
 1 file changed, 16 insertions(+), 7 deletions(-)

diff --git a/net/sunrpc/auth_gss/gss_rpc_xdr.c b/net/sunrpc/auth_gss/gss_rpc_xdr.c
index 1ec19f6..eeeba5a 100644
--- a/net/sunrpc/auth_gss/gss_rpc_xdr.c
+++ b/net/sunrpc/auth_gss/gss_rpc_xdr.c
@@ -793,20 +793,26 @@ int gssx_dec_accept_sec_context(struct rpc_rqst *rqstp,
 {
 	u32 value_follows;
 	int err;
+	struct page *scratch;
+
+	scratch = alloc_page(GFP_KERNEL);
+	if (!scratch)
+		return -ENOMEM;
+	xdr_set_scratch_buffer(xdr, page_address(scratch), PAGE_SIZE);
 
 	/* res->status */
 	err = gssx_dec_status(xdr, &res->status);
 	if (err)
-		return err;
+		goto out_free;
 
 	/* res->context_handle */
 	err = gssx_dec_bool(xdr, &value_follows);
 	if (err)
-		return err;
+		goto out_free;
 	if (value_follows) {
 		err = gssx_dec_ctx(xdr, res->context_handle);
 		if (err)
-			return err;
+			goto out_free;
 	} else {
 		res->context_handle = NULL;
 	}
@@ -814,11 +820,11 @@ int gssx_dec_accept_sec_context(struct rpc_rqst *rqstp,
 	/* res->output_token */
 	err = gssx_dec_bool(xdr, &value_follows);
 	if (err)
-		return err;
+		goto out_free;
 	if (value_follows) {
 		err = gssx_dec_buffer(xdr, res->output_token);
 		if (err)
-			return err;
+			goto out_free;
 	} else {
 		res->output_token = NULL;
 	}
@@ -826,14 +832,17 @@ int gssx_dec_accept_sec_context(struct rpc_rqst *rqstp,
 	/* res->delegated_cred_handle */
 	err = gssx_dec_bool(xdr, &value_follows);
 	if (err)
-		return err;
+		goto out_free;
 	if (value_follows) {
 		/* we do not support upcall servers sending this data. */
-		return -EINVAL;
+		err = -EINVAL;
+		goto out_free;
 	}
 
 	/* res->options */
 	err = gssx_dec_option_array(xdr, &res->options);
 
+out_free:
+	__free_page(scratch);
 	return err;
 }
-- 
1.9.3


^ permalink raw reply related	[flat|nested] 4+ messages in thread

* Re: [PATCH] svcrpc: fix potential GSSX_ACCEPT_SEC_CONTEXT decoding failures
  2015-04-28 20:29 [PATCH] svcrpc: fix potential GSSX_ACCEPT_SEC_CONTEXT decoding failures Scott Mayhew
@ 2015-04-28 21:09 ` Simo Sorce
  2015-04-29 15:38   ` J. Bruce Fields
  0 siblings, 1 reply; 4+ messages in thread
From: Simo Sorce @ 2015-04-28 21:09 UTC (permalink / raw)
  To: Scott Mayhew; +Cc: bfields, linux-nfs

Thanks Scott,
I think this will help with older GSS-Proxy versions, in the newer
versions we are simply suppressing the exported composite name as the
kernel has no use for it.

Simo.

On Tue, 2015-04-28 at 16:29 -0400, Scott Mayhew wrote:
> In an environment where the KDC is running Active Directory, the
> exported composite name field returned in the context could be large
> enough to span a page boundary.  Attaching a scratch buffer to the
> decoding xdr_stream helps deal with those cases.
> 
> Signed-off-by: Scott Mayhew <smayhew@redhat.com>
> ---
>  net/sunrpc/auth_gss/gss_rpc_xdr.c | 23 ++++++++++++++++-------
>  1 file changed, 16 insertions(+), 7 deletions(-)
> 
> diff --git a/net/sunrpc/auth_gss/gss_rpc_xdr.c b/net/sunrpc/auth_gss/gss_rpc_xdr.c
> index 1ec19f6..eeeba5a 100644
> --- a/net/sunrpc/auth_gss/gss_rpc_xdr.c
> +++ b/net/sunrpc/auth_gss/gss_rpc_xdr.c
> @@ -793,20 +793,26 @@ int gssx_dec_accept_sec_context(struct rpc_rqst *rqstp,
>  {
>  	u32 value_follows;
>  	int err;
> +	struct page *scratch;
> +
> +	scratch = alloc_page(GFP_KERNEL);
> +	if (!scratch)
> +		return -ENOMEM;
> +	xdr_set_scratch_buffer(xdr, page_address(scratch), PAGE_SIZE);
>  
>  	/* res->status */
>  	err = gssx_dec_status(xdr, &res->status);
>  	if (err)
> -		return err;
> +		goto out_free;
>  
>  	/* res->context_handle */
>  	err = gssx_dec_bool(xdr, &value_follows);
>  	if (err)
> -		return err;
> +		goto out_free;
>  	if (value_follows) {
>  		err = gssx_dec_ctx(xdr, res->context_handle);
>  		if (err)
> -			return err;
> +			goto out_free;
>  	} else {
>  		res->context_handle = NULL;
>  	}
> @@ -814,11 +820,11 @@ int gssx_dec_accept_sec_context(struct rpc_rqst *rqstp,
>  	/* res->output_token */
>  	err = gssx_dec_bool(xdr, &value_follows);
>  	if (err)
> -		return err;
> +		goto out_free;
>  	if (value_follows) {
>  		err = gssx_dec_buffer(xdr, res->output_token);
>  		if (err)
> -			return err;
> +			goto out_free;
>  	} else {
>  		res->output_token = NULL;
>  	}
> @@ -826,14 +832,17 @@ int gssx_dec_accept_sec_context(struct rpc_rqst *rqstp,
>  	/* res->delegated_cred_handle */
>  	err = gssx_dec_bool(xdr, &value_follows);
>  	if (err)
> -		return err;
> +		goto out_free;
>  	if (value_follows) {
>  		/* we do not support upcall servers sending this data. */
> -		return -EINVAL;
> +		err = -EINVAL;
> +		goto out_free;
>  	}
>  
>  	/* res->options */
>  	err = gssx_dec_option_array(xdr, &res->options);
>  
> +out_free:
> +	__free_page(scratch);
>  	return err;
>  }


-- 
Simo Sorce * Red Hat, Inc * New York


^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: [PATCH] svcrpc: fix potential GSSX_ACCEPT_SEC_CONTEXT decoding failures
  2015-04-28 21:09 ` Simo Sorce
@ 2015-04-29 15:38   ` J. Bruce Fields
  2015-04-29 15:39     ` J. Bruce Fields
  0 siblings, 1 reply; 4+ messages in thread
From: J. Bruce Fields @ 2015-04-29 15:38 UTC (permalink / raw)
  To: Simo Sorce; +Cc: Scott Mayhew, linux-nfs

On Tue, Apr 28, 2015 at 05:09:25PM -0400, Simo Sorce wrote:
> Thanks Scott,
> I think this will help with older GSS-Proxy versions, in the newer
> versions we are simply suppressing the exported composite name as the
> kernel has no use for it.

Thanks.  (Also adding a Reviewed-by: Simo Sorce <simo@redhat.com>.)

--b.

> 
> Simo.
> 
> On Tue, 2015-04-28 at 16:29 -0400, Scott Mayhew wrote:
> > In an environment where the KDC is running Active Directory, the
> > exported composite name field returned in the context could be large
> > enough to span a page boundary.  Attaching a scratch buffer to the
> > decoding xdr_stream helps deal with those cases.
> > 
> > Signed-off-by: Scott Mayhew <smayhew@redhat.com>
> > ---
> >  net/sunrpc/auth_gss/gss_rpc_xdr.c | 23 ++++++++++++++++-------
> >  1 file changed, 16 insertions(+), 7 deletions(-)
> > 
> > diff --git a/net/sunrpc/auth_gss/gss_rpc_xdr.c b/net/sunrpc/auth_gss/gss_rpc_xdr.c
> > index 1ec19f6..eeeba5a 100644
> > --- a/net/sunrpc/auth_gss/gss_rpc_xdr.c
> > +++ b/net/sunrpc/auth_gss/gss_rpc_xdr.c
> > @@ -793,20 +793,26 @@ int gssx_dec_accept_sec_context(struct rpc_rqst *rqstp,
> >  {
> >  	u32 value_follows;
> >  	int err;
> > +	struct page *scratch;
> > +
> > +	scratch = alloc_page(GFP_KERNEL);
> > +	if (!scratch)
> > +		return -ENOMEM;
> > +	xdr_set_scratch_buffer(xdr, page_address(scratch), PAGE_SIZE);
> >  
> >  	/* res->status */
> >  	err = gssx_dec_status(xdr, &res->status);
> >  	if (err)
> > -		return err;
> > +		goto out_free;
> >  
> >  	/* res->context_handle */
> >  	err = gssx_dec_bool(xdr, &value_follows);
> >  	if (err)
> > -		return err;
> > +		goto out_free;
> >  	if (value_follows) {
> >  		err = gssx_dec_ctx(xdr, res->context_handle);
> >  		if (err)
> > -			return err;
> > +			goto out_free;
> >  	} else {
> >  		res->context_handle = NULL;
> >  	}
> > @@ -814,11 +820,11 @@ int gssx_dec_accept_sec_context(struct rpc_rqst *rqstp,
> >  	/* res->output_token */
> >  	err = gssx_dec_bool(xdr, &value_follows);
> >  	if (err)
> > -		return err;
> > +		goto out_free;
> >  	if (value_follows) {
> >  		err = gssx_dec_buffer(xdr, res->output_token);
> >  		if (err)
> > -			return err;
> > +			goto out_free;
> >  	} else {
> >  		res->output_token = NULL;
> >  	}
> > @@ -826,14 +832,17 @@ int gssx_dec_accept_sec_context(struct rpc_rqst *rqstp,
> >  	/* res->delegated_cred_handle */
> >  	err = gssx_dec_bool(xdr, &value_follows);
> >  	if (err)
> > -		return err;
> > +		goto out_free;
> >  	if (value_follows) {
> >  		/* we do not support upcall servers sending this data. */
> > -		return -EINVAL;
> > +		err = -EINVAL;
> > +		goto out_free;
> >  	}
> >  
> >  	/* res->options */
> >  	err = gssx_dec_option_array(xdr, &res->options);
> >  
> > +out_free:
> > +	__free_page(scratch);
> >  	return err;
> >  }
> 
> 
> -- 
> Simo Sorce * Red Hat, Inc * New York

^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: [PATCH] svcrpc: fix potential GSSX_ACCEPT_SEC_CONTEXT decoding failures
  2015-04-29 15:38   ` J. Bruce Fields
@ 2015-04-29 15:39     ` J. Bruce Fields
  0 siblings, 0 replies; 4+ messages in thread
From: J. Bruce Fields @ 2015-04-29 15:39 UTC (permalink / raw)
  To: Simo Sorce; +Cc: Scott Mayhew, linux-nfs

On Wed, Apr 29, 2015 at 11:38:34AM -0400, J. Bruce Fields wrote:
> On Tue, Apr 28, 2015 at 05:09:25PM -0400, Simo Sorce wrote:
> > Thanks Scott,
> > I think this will help with older GSS-Proxy versions, in the newer
> > versions we are simply suppressing the exported composite name as the
> > kernel has no use for it.
> 
> Thanks.  (Also adding a Reviewed-by: Simo Sorce <simo@redhat.com>.)

(And a stable cc:.)

--b.

^ permalink raw reply	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2015-04-29 15:39 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2015-04-28 20:29 [PATCH] svcrpc: fix potential GSSX_ACCEPT_SEC_CONTEXT decoding failures Scott Mayhew
2015-04-28 21:09 ` Simo Sorce
2015-04-29 15:38   ` J. Bruce Fields
2015-04-29 15:39     ` J. Bruce Fields

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