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af-packet: fix - avoid reading stale data
Currently we flush tp_status and then flush the remainder of the header+payload. tp_status should be flushed in the end to avoid stale data being read by user-space. Incorrectly re-ordered barriers in v1. Signed-off-by: Chetan Loke <loke.chetan@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -1129,7 +1129,6 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
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else
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sll->sll_ifindex = dev->ifindex;
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__packet_set_status(po, h.raw, status);
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smp_mb();
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#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
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{
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@ -1138,8 +1137,10 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
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end = (u8 *)PAGE_ALIGN((unsigned long)h.raw + macoff + snaplen);
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for (start = h.raw; start < end; start += PAGE_SIZE)
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flush_dcache_page(pgv_to_page(start));
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smp_wmb();
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}
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#endif
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__packet_set_status(po, h.raw, status);
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sk->sk_data_ready(sk, 0);
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