Messages in this thread Patch in this message | | | Date | Fri, 15 Mar 2019 20:51:32 +0100 | Subject | [PATCH v11 08/14] 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..89db3b4fc753 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -1758,6 +1758,8 @@ static int tcp_zerocopy_receive(struct sock *sk, int inq; int ret; + address = untagged_addr(address); + if (address & (PAGE_SIZE - 1) || address != zc->address) return -EINVAL; -- 2.21.0.360.g471c308f928-goog
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