This is a note to let you know that I've just added the patch titled
NFSD: Protect against send buffer overflow in NFSv3 READDIR
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
nfsd-protect-against-send-buffer-overflow-in-nfsv3-r.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 7c6691c3dad395ca715c972974de3ef242147e1a
Author: Chuck Lever <chuck.lever@xxxxxxxxxx>
Date: Thu Sep 1 15:10:12 2022 -0400
NFSD: Protect against send buffer overflow in NFSv3 READDIR
[ Upstream commit 640f87c190e0d1b2a0fcb2ecf6d2cd53b1c41991 ]
Since before the git era, NFSD has conserved the number of pages
held by each nfsd thread by combining the RPC receive and send
buffers into a single array of pages. This works because there are
no cases where an operation needs a large RPC Call message and a
large RPC Reply message at the same time.
Once an RPC Call has been received, svc_process() updates
svc_rqst::rq_res to describe the part of rq_pages that can be
used for constructing the Reply. This means that the send buffer
(rq_res) shrinks when the received RPC record containing the RPC
Call is large.
A client can force this shrinkage on TCP by sending a correctly-
formed RPC Call header contained in an RPC record that is
excessively large. The full maximum payload size cannot be
constructed in that case.
Thanks to Aleksi Illikainen and Kari Hulkko for uncovering this
issue.
Reported-by: Ben Ronallo <Benjamin.Ronallo@xxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
Reviewed-by: Jeff Layton <jlayton@xxxxxxxxxx>
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/nfsd/nfs3proc.c b/fs/nfsd/nfs3proc.c
index 1a52f0b06ec32..d808779ab4538 100644
--- a/fs/nfsd/nfs3proc.c
+++ b/fs/nfsd/nfs3proc.c
@@ -563,13 +563,14 @@ static void nfsd3_init_dirlist_pages(struct svc_rqst *rqstp,
{
struct xdr_buf *buf = &resp->dirlist;
struct xdr_stream *xdr = &resp->xdr;
-
- count = clamp(count, (u32)(XDR_UNIT * 2), svc_max_payload(rqstp));
+ unsigned int sendbuf = min_t(unsigned int, rqstp->rq_res.buflen,
+ svc_max_payload(rqstp));
memset(buf, 0, sizeof(*buf));
/* Reserve room for the NULL ptr & eof flag (-2 words) */
- buf->buflen = count - XDR_UNIT * 2;
+ buf->buflen = clamp(count, (u32)(XDR_UNIT * 2), sendbuf);
+ buf->buflen -= XDR_UNIT * 2;
buf->pages = rqstp->rq_next_page;
rqstp->rq_next_page += (buf->buflen + PAGE_SIZE - 1) >> PAGE_SHIFT;
