diff options
| author | Jeremy Cline <jcline@redhat.com> | 2018-08-14 01:23:13 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-08-14 20:01:24 +0300 |
| commit | 66b51b0a0341fd42ce657739bdae0561b0410a85 (patch) | |
| tree | fd78fd9cb07be5628896380c282ab7d0e841d7d8 | |
| parent | 1c89a8e3d9a235454169e189ea6c463bfa8749ab (diff) | |
| download | linux-66b51b0a0341fd42ce657739bdae0561b0410a85.tar.xz | |
net: sock_diag: Fix spectre v1 gadget in __sock_diag_cmd()
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@redhat.com>
Cc: konrad.wilk@oracle.com
Cc: jamie.iles@oracle.com
Cc: liran.alon@oracle.com
Cc: stable@vger.kernel.org
Signed-off-by: Jeremy Cline <jcline@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/core/sock_diag.c | 2 | ||||
| -rw-r--r-- | net/socket.c | 3 |
2 files changed, 3 insertions, 2 deletions
diff --git a/net/core/sock_diag.c b/net/core/sock_diag.c index c37b5be7c5e4..3312a5849a97 100644 --- 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_buff *skb, struct nlmsghdr *nlh) 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); diff --git a/net/socket.c b/net/socket.c index b91949168a87..270f28264cb1 100644 --- a/net/socket.c +++ b/net/socket.c @@ -2697,8 +2697,7 @@ 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) |