Messages in this thread Patch in this message | | | Date | Wed, 20 Mar 2019 15:51:23 +0100 | Subject | [PATCH v13 09/20] net, arm64: untag user pointers in tcp_zerocopy_receive | From | Andrey Konovalov <> |
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This patch is a part of a series that extends arm64 kernel ABI to allow to pass tagged user pointers (with the top byte set to something else other than 0x00) as syscall arguments.
tcp_zerocopy_receive() uses provided user pointers for vma lookups, which can only by done with untagged pointers.
Untag user pointers in this function.
Signed-off-by: Andrey Konovalov <andreyknvl@google.com> --- net/ipv4/tcp.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 6baa6dc1b13b..855a1f68c1ea 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -1761,6 +1761,8 @@ static int tcp_zerocopy_receive(struct sock *sk, if (address & (PAGE_SIZE - 1) || address != zc->address) return -EINVAL; + address = untagged_addr(address); + if (sk->sk_state == TCP_LISTEN) return -ENOTCONN; -- 2.21.0.225.g810b269d1ac-goog
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