lkml.org 
[lkml]   [2008]   [Jul]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
Subject[PATCH] svcrpc: fix handling of garbage args
From
From: J. Bruce Fields <bfields@citi.umich.edu>

To return garbage_args, the accept_stat must be 0, and we must have a
verifier. So we shouldn't be resetting the write pointer as we reject
the call.

Also, we must add the two placeholder words here regardless of success
of the unwrap, to ensure the output buffer is left in a consistent state
for svcauth_gss_release().

This fixes a BUG() in svcauth_gss.c:svcauth_gss_release().

Thanks to Aime Le Rouzic for bug report, debugging help, and testing.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Tested-by: Aime Le Rouzic <aime.le-rouzic@bull.net>
---
net/sunrpc/auth_gss/svcauth_gss.c | 12 +++++-------
1 files changed, 5 insertions(+), 7 deletions(-)

Apologies, resending after I noticed Aime's address was mangled.

As before, also available from

git://linux-nfs.org/~bfields/linux.git for-2.6.26

--b.

diff --git a/net/sunrpc/auth_gss/svcauth_gss.c b/net/sunrpc/auth_gss/svcauth_gss.c
index 5905d56..81ae3d6 100644
--- a/net/sunrpc/auth_gss/svcauth_gss.c
+++ b/net/sunrpc/auth_gss/svcauth_gss.c
@@ -1144,20 +1144,20 @@ svcauth_gss_accept(struct svc_rqst *rqstp, __be32 *authp)
case RPC_GSS_SVC_NONE:
break;
case RPC_GSS_SVC_INTEGRITY:
+ /* placeholders for length and seq. number: */
+ svc_putnl(resv, 0);
+ svc_putnl(resv, 0);
if (unwrap_integ_data(&rqstp->rq_arg,
gc->gc_seq, rsci->mechctx))
goto garbage_args;
+ break;
+ case RPC_GSS_SVC_PRIVACY:
/* placeholders for length and seq. number: */
svc_putnl(resv, 0);
svc_putnl(resv, 0);
- break;
- case RPC_GSS_SVC_PRIVACY:
if (unwrap_priv_data(rqstp, &rqstp->rq_arg,
gc->gc_seq, rsci->mechctx))
goto garbage_args;
- /* placeholders for length and seq. number: */
- svc_putnl(resv, 0);
- svc_putnl(resv, 0);
break;
default:
goto auth_err;
@@ -1170,8 +1170,6 @@ svcauth_gss_accept(struct svc_rqst *rqstp, __be32 *authp)
goto out;
}
garbage_args:
- /* Restore write pointer to its original value: */
- xdr_ressize_check(rqstp, reject_stat);
ret = SVC_GARBAGE;
goto out;
auth_err:
--
1.5.5.rc1


\
 
 \ /
  Last update: 2008-07-03 21:37    [W:0.028 / U:0.348 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site