From 6b55707ff8b296243a9cf6636d6d8459b6a4a7f8 Mon Sep 17 00:00:00 2001 From: Chuck Lever Date: Thu, 1 Sep 2022 15:09:53 -0400 Subject: [PATCH] SUNRPC: Fix svcxdr_init_decode's end-of-buffer calculation [ Upstream commit 90bfc37b5ab91c1a6165e3e5cfc49bf04571b762 ] Ensure that stream-based argument decoding can't go past the actual end of the receive buffer. xdr_init_decode's calculation of the value of xdr->end over-estimates the end of the buffer because the Linux kernel RPC server code does not remove the size of the RPC header from rqstp->rq_arg before calling the upper layer's dispatcher. The server-side still uses the svc_getnl() macros to decode the RPC call header. These macros reduce the length of the head iov but do not update the total length of the message in the buffer (buf->len). A proper fix for this would be to replace the use of svc_getnl() and friends in the RPC header decoder, but that would be a large and invasive change that would be difficult to backport. Fixes: 5191955d6fc6 ("SUNRPC: Prepare for xdr_stream-style decoding on the server-side") Reviewed-by: Jeff Layton Signed-off-by: Chuck Lever Signed-off-by: Sasha Levin --- include/linux/sunrpc/svc.h | 17 ++++++++++++++--- 1 file changed, 14 insertions(+), 3 deletions(-) diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h index 01f09ad..6be55d0 100644 --- a/include/linux/sunrpc/svc.h +++ b/include/linux/sunrpc/svc.h @@ -566,16 +566,27 @@ static inline void svc_reserve_auth(struct svc_rqst *rqstp, int space) } /** - * svcxdr_init_decode - Prepare an xdr_stream for svc Call decoding + * svcxdr_init_decode - Prepare an xdr_stream for Call decoding * @rqstp: controlling server RPC transaction context * + * This function currently assumes the RPC header in rq_arg has + * already been decoded. Upon return, xdr->p points to the + * location of the upper layer header. */ static inline void svcxdr_init_decode(struct svc_rqst *rqstp) { struct xdr_stream *xdr = &rqstp->rq_arg_stream; - struct kvec *argv = rqstp->rq_arg.head; + struct xdr_buf *buf = &rqstp->rq_arg; + struct kvec *argv = buf->head; - xdr_init_decode(xdr, &rqstp->rq_arg, argv->iov_base, NULL); + /* + * svc_getnl() and friends do not keep the xdr_buf's ::len + * field up to date. Refresh that field before initializing + * the argument decoding stream. + */ + buf->len = buf->head->iov_len + buf->page_len + buf->tail->iov_len; + + xdr_init_decode(xdr, buf, argv->iov_base, NULL); xdr_set_scratch_page(xdr, rqstp->rq_scratch_page); } -- 2.7.4