| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.15 128/168] netlink: make sure nladdr has correct size in netlink_connect() | Date | Wed, 11 Apr 2018 00:24:30 +0200 |
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4.15-stable review patch. If anyone has any objections, please let me know.
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From: Alexander Potapenko <glider@google.com>
[ Upstream commit 7880287981b60a6808f39f297bb66936e8bdf57a ]
KMSAN reports use of uninitialized memory in the case when |alen| is smaller than sizeof(struct sockaddr_nl), and therefore |nladdr| isn't fully copied from the userspace.
Signed-off-by: Alexander Potapenko <glider@google.com> Fixes: 1da177e4c3f41524 ("Linux-2.6.12-rc2") Reviewed-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- net/netlink/af_netlink.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/net/netlink/af_netlink.c +++ b/net/netlink/af_netlink.c @@ -1052,6 +1052,9 @@ static int netlink_connect(struct socket if (addr->sa_family != AF_NETLINK) return -EINVAL; + if (alen < sizeof(struct sockaddr_nl)) + return -EINVAL; + if ((nladdr->nl_groups || nladdr->nl_pid) && !netlink_allowed(sock, NL_CFG_F_NONROOT_SEND)) return -EPERM;
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