sunrpc: handle SVC_GARBAGE during svc auth processing as auth error

JIRA: https://issues.redhat.com/browse/RHEL-101330
CVE: CVE-2025-38089

commit 94d10a4
Author: Jeff Layton <jlayton@kernel.org>
Date:   Thu Jun 19 06:01:55 2025 -0400

    sunrpc: handle SVC_GARBAGE during svc auth processing as auth error

    tianshuo han reported a remotely-triggerable crash if the client sends a
    kernel RPC server a specially crafted packet. If decoding the RPC reply
    fails in such a way that SVC_GARBAGE is returned without setting the
    rq_accept_statp pointer, then that pointer can be dereferenced and a
    value stored there.

    If it's the first time the thread has processed an RPC, then that
    pointer will be set to NULL and the kernel will crash. In other cases,
    it could create a memory scribble.

    The server sunrpc code treats a SVC_GARBAGE return from svc_authenticate
    or pg_authenticate as if it should send a GARBAGE_ARGS reply. RFC 5531
    says that if authentication fails that the RPC should be rejected
    instead with a status of AUTH_ERR.

    Handle a SVC_GARBAGE return as an AUTH_ERROR, with a reason of
    AUTH_BADCRED instead of returning GARBAGE_ARGS in that case. This
    sidesteps the whole problem of touching the rpc_accept_statp pointer in
    this situation and avoids the crash.

    Cc: stable@kernel.org
    Fixes: 29cd292 ("SUNRPC: Fix encoding of accepted but unsuccessful RPC replies")
    Reported-by: tianshuo han <hantianshuo233@gmail.com>
    Reviewed-by: Chuck Lever <chuck.lever@oracle.com>
    Signed-off-by: Jeff Layton <jlayton@kernel.org>
    Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

Signed-off-by: CKI Backport Bot <cki-ci-bot+cki-gitlab-backport-bot@redhat.com>

Author: CKI Backport Bot

net/sunrpc/svc.c

@@ -1369,7 +1369,8 @@ svc_process_common(struct svc_rqst *rqstp)
 	case SVC_OK:
 		break;
 	case SVC_GARBAGE:
-		goto err_garbage_args;
+		rqstp->rq_auth_stat = rpc_autherr_badcred;
+		goto err_bad_auth;
 	case SVC_SYSERR:
 		goto err_system_err;
 	case SVC_DENIED:
@@ -1510,14 +1511,6 @@ svc_process_common(struct svc_rqst *rqstp)
 	*rqstp->rq_accept_statp = rpc_proc_unavail;
 	goto sendit;
 
-err_garbage_args:
-	svc_printk(rqstp, "failed to decode RPC header\n");
-
-	if (serv->sv_stats)
-		serv->sv_stats->rpcbadfmt++;
-	*rqstp->rq_accept_statp = rpc_garbage_args;
-	goto sendit;
-
 err_system_err:
 	if (serv->sv_stats)
 		serv->sv_stats->rpcbadfmt++;