6.5-stable review patch. If anyone has any objections, please let me know. ------------------ From: Chuck Lever <chuck.lever@xxxxxxxxxx> [ Upstream commit 0d32a6bbb8e7bf503855f2990f1ccce0922db87b ] nfsd4_encode_readv() uses xdr->buf->page_len as a starting point for the nfsd_iter_read() sink buffer -- page_len is going to be offset by the parts of the COMPOUND that have already been encoded into xdr->buf->pages. However, that value must be captured /before/ xdr_reserve_space_vec() advances page_len by the expected size of the read payload. Otherwise, the whole front part of the first page of the payload in the reply will be uninitialized. Mantas hit this because sec=krb5i forces RQ_SPLICE_OK off, which invokes the readv part of the nfsd4_encode_read() path. Also, older Linux NFS clients appear to send shorter READ requests for files smaller than a page, whereas newer clients just send page-sized requests and let the server send as many bytes as are in the file. Reported-by: Mantas Mikulėnas <grawity@xxxxxxxxx> Closes: https://lore.kernel.org/linux-nfs/f1d0b234-e650-0f6e-0f5d-126b3d51d1eb@xxxxxxxxx/ Fixes: 703d75215555 ("NFSD: Hoist rq_vec preparation into nfsd_read() [step two]") Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- fs/nfsd/nfs4xdr.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c index be72628b13376..d2588f4ac42be 100644 --- a/fs/nfsd/nfs4xdr.c +++ b/fs/nfsd/nfs4xdr.c @@ -4105,6 +4105,7 @@ static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp, struct file *file, unsigned long maxcount) { struct xdr_stream *xdr = resp->xdr; + unsigned int base = xdr->buf->page_len & ~PAGE_MASK; unsigned int starting_len = xdr->buf->len; __be32 zero = xdr_zero; __be32 nfserr; @@ -4113,8 +4114,7 @@ static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp, return nfserr_resource; nfserr = nfsd_iter_read(resp->rqstp, read->rd_fhp, file, - read->rd_offset, &maxcount, - xdr->buf->page_len & ~PAGE_MASK, + read->rd_offset, &maxcount, base, &read->rd_eof); read->rd_length = maxcount; if (nfserr) -- 2.40.1
