netlink: Always copy on mmap TX.

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Checking the file f_count and the nlk->mapped count is not completely
sufficient to prevent the mmap'd area contents from changing from
under us during netlink mmap sendmsg() operations.

Be careful to sample the header's length field only once, because this
could change from under us as well.

Fixes: 5fd96123ee ("netlink: implement memory mapped sendmsg()")
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Daniel Borkmann <dborkman@redhat.com>
Acked-by: Thomas Graf <tgraf@suug.ch>

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David Miller 2014-12-16 17:58:17 -05:00 • committed by David S. Miller

parent 65891feac2

commit 4682a03586

1 changed files with 16 additions and 36 deletions

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net/netlink/af_netlink.c

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