netdev - [RFC PATCH v2 bpf-next 0/2] verifier liveness simplification

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Message-ID: <d16ea072-61a0-8f8a-aca1-13cac09d3d14@solarflare.com>
Date:   Wed, 22 Aug 2018 20:00:46 +0100
From:   Edward Cree <ecree@...arflare.com>
To:     <ast@...nel.org>, <daniel@...earbox.net>
CC:     <netdev@...r.kernel.org>
Subject: [RFC PATCH v2 bpf-next 0/2] verifier liveness simplification

The first patch is a simplification of register liveness tracking by using
 a separate parentage chain for each register and stack slot, thus avoiding
 the need for logic to handle callee-saved registers when applying read
 marks.  In the future this idea may be extended to form use-def chains.
The second patch adds information about misc/zero data on the stack to the
 state dumps emitted to the log at various points; this information was
 found essential in debugging the first patch, and may be useful elsewhere.

Edward Cree (2):
  bpf/verifier: per-register parent pointers
  bpf/verifier: display non-spill stack slot types in
    print_verifier_state

 include/linux/bpf_verifier.h |   8 +-
 kernel/bpf/verifier.c        | 216 ++++++++++++++-----------------------------
 2 files changed, 72 insertions(+), 152 deletions(-)