netdev - Re: bpf pointer alignment validation

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Message-Id: <20170510.115720.1396306489898364855.davem@davemloft.net>
Date:   Wed, 10 May 2017 11:57:20 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     daniel@...earbox.net
Cc:     alexei.starovoitov@...il.com, ast@...com, netdev@...r.kernel.org
Subject: Re: bpf pointer alignment validation

From: Daniel Borkmann <daniel@...earbox.net>
Date: Wed, 10 May 2017 17:51:50 +0200

> Would probably be good nevertheless to have this as a flag for
> program loads, which gets then passed through to the verifier to
> explicitly enable strict alignment checks.
> 
> Might certainly aide developing & testing programs on archs with
> efficient unaligned access and later actually running them on archs
> that don't have it. (And at minimum, it also helps for checking
> the test suite against the verifier.)

Ok, I can implement this flag.

The only question is where to put it?  An unused bit in the program
type? :-)