linux-kernel - [PATCH 4.17 37/42] net: sock_diag: Fix spectre v1 gadget in __sock_diag

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Message-Id: <20180821055019.431183677@linuxfoundation.org>
Date:   Tue, 21 Aug 2018 08:21:09 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Josh Poimboeuf <jpoimboe@...hat.com>,
        konrad.wilk@...cle.com, jamie.iles@...cle.com,
        liran.alon@...cle.com, Jeremy Cline <jcline@...hat.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.17 37/42] net: sock_diag: Fix spectre v1 gadget in __sock_diag_cmd()

4.17-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jeremy Cline <jcline@...hat.com>

[ Upstream commit 66b51b0a0341fd42ce657739bdae0561b0410a85 ]

req->sdiag_family is a user-controlled value that's used as an array
index. Sanitize it after the bounds check to avoid speculative
out-of-bounds array access.

This also protects the sock_is_registered() call, so this removes the
sanitize call there.

Fixes: e978de7a6d38 ("net: socket: Fix potential spectre v1 gadget in sock_is_registered")
Cc: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: konrad.wilk@...cle.com
Cc: jamie.iles@...cle.com
Cc: liran.alon@...cle.com
Cc: stable@...r.kernel.org
Signed-off-by: Jeremy Cline <jcline@...hat.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/core/sock_diag.c |    2 ++
 net/socket.c         |    3 +--
 2 files changed, 3 insertions(+), 2 deletions(-)

--- a/net/core/sock_diag.c
+++ b/net/core/sock_diag.c
@@ -10,6 +10,7 @@
 #include <linux/kernel.h>
 #include <linux/tcp.h>
 #include <linux/workqueue.h>
+#include <linux/nospec.h>
 
 #include <linux/inet_diag.h>
 #include <linux/sock_diag.h>
@@ -218,6 +219,7 @@ static int __sock_diag_cmd(struct sk_buf
 
 	if (req->sdiag_family >= AF_MAX)
 		return -EINVAL;
+	req->sdiag_family = array_index_nospec(req->sdiag_family, AF_MAX);
 
 	if (sock_diag_handlers[req->sdiag_family] == NULL)
 		sock_load_diag_module(req->sdiag_family, 0);
--- a/net/socket.c
+++ b/net/socket.c
@@ -2694,8 +2694,7 @@ EXPORT_SYMBOL(sock_unregister);
 
 bool sock_is_registered(int family)
 {
-	return family < NPROTO &&
-		rcu_access_pointer(net_families[array_index_nospec(family, NPROTO)]);
+	return family < NPROTO && rcu_access_pointer(net_families[family]);
 }
 
 static int __init sock_init(void)