netfilter: nfnetlink: Remove VLA usage
In the quest to remove all stack VLA usage from the kernel[1], this allocates the maximum size expected for all possible attrs and adds sanity-checks at both registration and usage to make sure nothing gets out of sync. [1] https://lkml.kernel.org/r/CA+55aFzCG-zNmZwX4A2FQpadafLfEzK6CC=qPXydAacU1RqZWA@mail.gmail.com Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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