As Daniel suggested to us, we ran our formal verification tool, Serval, over the arm JIT. The bugs we found have been patched and applied to the bpf tree [1, 2]. This patch series introduces two small optimizations that simplify the JIT and use fewer instructions. [1] https://lore.kernel.org/bpf/20200408181229.10909-1-luke.r.nels@xxxxxxxxx/ [2] https://lore.kernel.org/bpf/20200409221752.28448-1-luke.r.nels@xxxxxxxxx/ Luke Nelson (2): bpf, arm: Optimize emit_a32_arsh_r64 using conditional instruction bpf, arm: Optimize ALU ARSH K using asr immediate instruction arch/arm/net/bpf_jit_32.c | 14 +++++++++----- arch/arm/net/bpf_jit_32.h | 2 ++ 2 files changed, 11 insertions(+), 5 deletions(-) -- 2.17.1
