From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from out1-smtp.messagingengine.com ([66.111.4.25]:46093 "EHLO out1-smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751059AbdGYEGU (ORCPT ); Tue, 25 Jul 2017 00:06:20 -0400 Subject: FAILED: patch "[PATCH] sunrpc: use constant time memory comparison for mac" failed to apply to 4.4-stable tree To: Jason@zx2c4.com, Anna.Schumaker@Netapp.com, anna.schumaker@netapp.com, bfields@fieldses.org, jlayton@poochiereds.net, trond.myklebust@primarydata.com Cc: From: Date: Mon, 24 Jul 2017 21:06:14 -0700 Message-ID: <1500955574240225@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: The patch below does not apply to the 4.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >>From 15a8b93fd5690de017ce665382ea45e5d61811a4 Mon Sep 17 00:00:00 2001 From: "Jason A. Donenfeld" Date: Sat, 10 Jun 2017 04:59:07 +0200 Subject: [PATCH] sunrpc: use constant time memory comparison for mac Otherwise, we enable a MAC forgery via timing attack. Signed-off-by: Jason A. Donenfeld Cc: "J. Bruce Fields" Cc: Jeff Layton Cc: Trond Myklebust Cc: Anna Schumaker Cc: linux-nfs@vger.kernel.org Cc: stable@vger.kernel.org Signed-off-by: Anna Schumaker diff --git a/net/sunrpc/auth_gss/gss_krb5_crypto.c b/net/sunrpc/auth_gss/gss_krb5_crypto.c index fb39284ec174..12649c9fedab 100644 --- a/net/sunrpc/auth_gss/gss_krb5_crypto.c +++ b/net/sunrpc/auth_gss/gss_krb5_crypto.c @@ -34,6 +34,7 @@ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. */ +#include #include #include #include @@ -927,7 +928,7 @@ gss_krb5_aes_decrypt(struct krb5_ctx *kctx, u32 offset, struct xdr_buf *buf, if (ret) goto out_err; - if (memcmp(pkt_hmac, our_hmac, kctx->gk5e->cksumlength) != 0) { + if (crypto_memneq(pkt_hmac, our_hmac, kctx->gk5e->cksumlength) != 0) { ret = GSS_S_BAD_SIG; goto out_err; }