netdev - [PATCH bpf-next 0/4] Fix up bpf_jit

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Message-Id: <20210924095542.33697-1-lmb@cloudflare.com>
Date:   Fri, 24 Sep 2021 10:55:38 +0100
From:   Lorenz Bauer <lmb@...udflare.com>
To:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>
Cc:     kernel-team@...udflare.com, Lorenz Bauer <lmb@...udflare.com>,
        linux-riscv@...ts.infradead.org, netdev@...r.kernel.org,
        bpf@...r.kernel.org
Subject: [PATCH bpf-next 0/4] Fix up bpf_jit_limit some more

Some more cleanups around bpf_jit_limit to make it readable via sysctl.

Things I'm not sure about:
* Is it OK to expose atomic_long_t bpf_jit_limit like this? The sysctl code
  isn't atomic, but maybe it's fine because it's read only.
* All of the JIT related sysctls are quite restrictive, you have to have
  CAP_SYS_ADMIN / CAP_BPF _and_ be root as well. This makes it problematic
  to scrape these to expose them as metrics. Can we relax this somewhat?

Lorenz

Lorenz Bauer (4):
  bpf: define bpf_jit_alloc_exec_limit for riscv JIT
  bpf: define bpf_jit_alloc_exec_limit for arm64 JIT
  bpf: prevent increasing bpf_jit_limit above max
  bpf: export bpf_jit_current

 arch/arm64/net/bpf_jit_comp.c | 5 +++++
 arch/riscv/net/bpf_jit_core.c | 5 +++++
 include/linux/filter.h        | 2 ++
 kernel/bpf/core.c             | 7 ++++---
 net/core/sysctl_net_core.c    | 9 ++++++++-
 5 files changed, 24 insertions(+), 4 deletions(-)

-- 
2.30.2