[PATCH v4.4] sunrpc: use-after-free in svc_process_common()

[PATCH v4.4] sunrpc: use-after-free in svc_process_common()

[Vasily Averin]

Backported mainline commit d4b09acf924b84bae77cad090a9d108e70b43643
Author: Vasily Averin <vvs@virtuozzo.com>
Date:   Mon Dec 24 14:44:52 2018 +0300

    sunrpc: use-after-free in svc_process_common()

    if node have NFSv41+ mounts inside several net namespaces
    it can lead to use-after-free in svc_process_common()

    svc_process_common()
            /* Setup reply header */
            rqstp->rq_xprt->xpt_ops->xpo_prep_reply_hdr(rqstp); <<< HERE

    svc_process_common() can use incorrect rqstp->rq_xprt,
    its caller function bc_svc_process() takes it from serv->sv_bc_xprt.
    The problem is that serv is global structure but sv_bc_xprt
    is assigned per-netnamespace.

    According to Trond, the whole "let's set up rqstp->rq_xprt
    for the back channel" is nothing but a giant hack in order
    to work around the fact that svc_process_common() uses it
    to find the xpt_ops, and perform a couple of (meaningless
    for the back channel) tests of xpt_flags.

    All we really need in svc_process_common() is to be able to run
    rqstp->rq_xprt->xpt_ops->xpo_prep_reply_hdr()

    Bruce J Fields points that this xpo_prep_reply_hdr() call
    is an awfully roundabout way just to do "svc_putnl(resv, 0);"
    in the tcp case.

    This patch does not initialiuze rqstp->rq_xprt in bc_svc_process(),
    now it calls svc_process_common() with rqstp->rq_xprt = NULL.

    To adjust reply header svc_process_common() just check
    rqstp->rq_prot and calls svc_tcp_prep_reply_hdr() for tcp case.

    To handle rqstp->rq_xprt = NULL case in functions called from
    svc_process_common() patch intruduces net namespace pointer
    svc_rqst->rq_bc_net and adjust SVC_NET() definition.
    Some other function was also adopted to properly handle described case.

    Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
    Cc: stable@vger.kernel.org
    Fixes: 23c20ecd4475 ("NFS: callback up - users counting cleanup")
    Signed-off-by: J. Bruce Fields <bfields@redhat.com>

v2: - added lost extern svc_tcp_prep_reply_hdr()
    - dropped trace_svc_process() changes
    - context fixes in svc_process_common()
Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
---
 include/linux/sunrpc/svc.h |  5 ++++-
 net/sunrpc/svc.c           | 10 +++++++---
 net/sunrpc/svc_xprt.c      |  5 +++--
 net/sunrpc/svcsock.c       |  2 +-
 4 files changed, 15 insertions(+), 7 deletions(-)

diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h
index cc0fc712bb82..a8ac3f25b4ec 100644
--- a/include/linux/sunrpc/svc.h
+++ b/include/linux/sunrpc/svc.h
@@ -290,9 +290,12 @@ struct svc_rqst {
 	struct svc_cacherep *	rq_cacherep;	/* cache info */
 	struct task_struct	*rq_task;	/* service thread */
 	spinlock_t		rq_lock;	/* per-request lock */
+	struct net		*rq_bc_net;	/* pointer to backchannel's
+						 * net namespace
+						 */
 };
 
-#define SVC_NET(svc_rqst)	(svc_rqst->rq_xprt->xpt_net)
+#define SVC_NET(rqst) (rqst->rq_xprt ? rqst->rq_xprt->xpt_net : rqst->rq_bc_net)
 
 /*
  * Rigorous type checking on sockaddr type conversions
diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c
index c5b0cb4f4056..6d521174427b 100644
--- a/net/sunrpc/svc.c
+++ b/net/sunrpc/svc.c
@@ -1062,6 +1062,8 @@ void svc_printk(struct svc_rqst *rqstp, const char *fmt, ...)
 static __printf(2,3) void svc_printk(struct svc_rqst *rqstp, const char *fmt, ...) {}
 #endif
 
+extern void svc_tcp_prep_reply_hdr(struct svc_rqst *);
+
 /*
  * Common routine for processing the RPC request.
  */
@@ -1091,7 +1093,8 @@ svc_process_common(struct svc_rqst *rqstp, struct kvec *argv, struct kvec *resv)
 	clear_bit(RQ_DROPME, &rqstp->rq_flags);
 
 	/* Setup reply header */
-	rqstp->rq_xprt->xpt_ops->xpo_prep_reply_hdr(rqstp);
+	if (rqstp->rq_prot == IPPROTO_TCP)
+		svc_tcp_prep_reply_hdr(rqstp);
 
 	svc_putu32(resv, rqstp->rq_xid);
 
@@ -1138,7 +1141,8 @@ svc_process_common(struct svc_rqst *rqstp, struct kvec *argv, struct kvec *resv)
 	case SVC_DENIED:
 		goto err_bad_auth;
 	case SVC_CLOSE:
-		if (test_bit(XPT_TEMP, &rqstp->rq_xprt->xpt_flags))
+		if (rqstp->rq_xprt && 
+		    test_bit(XPT_TEMP, &rqstp->rq_xprt->xpt_flags))
 			svc_close_xprt(rqstp->rq_xprt);
 	case SVC_DROP:
 		goto dropit;
@@ -1360,10 +1364,10 @@ bc_svc_process(struct svc_serv *serv, struct rpc_rqst *req,
 	dprintk("svc: %s(%p)\n", __func__, req);
 
 	/* Build the svc_rqst used by the common processing routine */
-	rqstp->rq_xprt = serv->sv_bc_xprt;
 	rqstp->rq_xid = req->rq_xid;
 	rqstp->rq_prot = req->rq_xprt->prot;
 	rqstp->rq_server = serv;
+	rqstp->rq_bc_net = req->rq_xprt->xprt_net;
 
 	rqstp->rq_addrlen = sizeof(req->rq_xprt->addr);
 	memcpy(&rqstp->rq_addr, &req->rq_xprt->addr, rqstp->rq_addrlen);
diff --git a/net/sunrpc/svc_xprt.c b/net/sunrpc/svc_xprt.c
index 71f15da72f02..2b8e80c721db 100644
--- a/net/sunrpc/svc_xprt.c
+++ b/net/sunrpc/svc_xprt.c
@@ -454,10 +454,11 @@ static struct svc_xprt *svc_xprt_dequeue(struct svc_pool *pool)
  */
 void svc_reserve(struct svc_rqst *rqstp, int space)
 {
+	struct svc_xprt *xprt = rqstp->rq_xprt;
+
 	space += rqstp->rq_res.head[0].iov_len;
 
-	if (space < rqstp->rq_reserved) {
-		struct svc_xprt *xprt = rqstp->rq_xprt;
+	if (xprt && space < rqstp->rq_reserved) {
 		atomic_sub((rqstp->rq_reserved - space), &xprt->xpt_reserved);
 		rqstp->rq_reserved = space;
 
diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c
index 9701fcca002c..0a9fe033132c 100644
--- a/net/sunrpc/svcsock.c
+++ b/net/sunrpc/svcsock.c
@@ -1240,7 +1240,7 @@ static int svc_tcp_sendto(struct svc_rqst *rqstp)
 /*
  * Setup response header. TCP has a 4B record length field.
  */
-static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp)
+void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp)
 {
 	struct kvec *resv = &rqstp->rq_res.head[0];
 
-- 
2.17.1