From: Kangjie Lu Date: Tue, 3 May 2016 20:46:24 +0000 (-0400) Subject: net: fix infoleak in rtnetlink X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=5f8e44741f9f216e33736ea4ec65ca9ac03036e6;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git net: fix infoleak in rtnetlink The stack object “map” has a total size of 32 bytes. Its last 4 bytes are padding generated by compiler. These padding bytes are not initialized and sent out via “nla_put”. Signed-off-by: Kangjie Lu Signed-off-by: David S. Miller --- diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index a75f7e94b445..65763c29f845 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -1180,14 +1180,16 @@ static noinline_for_stack int rtnl_fill_vfinfo(struct sk_buff *skb, static int rtnl_fill_link_ifmap(struct sk_buff *skb, struct net_device *dev) { - struct rtnl_link_ifmap map = { - .mem_start = dev->mem_start, - .mem_end = dev->mem_end, - .base_addr = dev->base_addr, - .irq = dev->irq, - .dma = dev->dma, - .port = dev->if_port, - }; + struct rtnl_link_ifmap map; + + memset(&map, 0, sizeof(map)); + map.mem_start = dev->mem_start; + map.mem_end = dev->mem_end; + map.base_addr = dev->base_addr; + map.irq = dev->irq; + map.dma = dev->dma; + map.port = dev->if_port; + if (nla_put(skb, IFLA_MAP, sizeof(map), &map)) return -EMSGSIZE;