linux-kernel - [PATCH bpf-next v4 0/3] Support kCFI + BPF on arm64

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Date: Mon, 13 May 2024 09:08:45 -0500
From: Maxwell Bland <mbland@...orola.com>
To: "open list:BPF [GENERAL] (Safe Dynamic Programs and Tools)" <bpf@...r.kernel.org>
Cc: Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Eduard Zingerman <eddyz87@...il.com>, Song Liu <song@...nel.org>,
        Yonghong Song <yonghong.song@...ux.dev>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>, Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        Zi Shen Lim <zlim.lnx@...il.com>, Mark Rutland <mark.rutland@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Mark Brown <broonie@...nel.org>, linux-arm-kernel@...ts.infradead.org,
        open list <linux-kernel@...r.kernel.org>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        Puranjay Mohan <puranjay12@...il.com>
Subject: [PATCH bpf-next v4 0/3]  Support kCFI + BPF on arm64

For the BPF summit meeting tomorrow, I might as well have a mergable
version. I took a look back on BPF-CFI patches to check the status and
found that there had been no updates for around a month, so I went ahead
and made the fixes suggested in v2.

E.g.
ffff80008021d5a4 <reuseport_array_lookup_elem>:   
ffff80008021d5a4: d503245f      bti     c         

Potentially this should be replaced by a proper paciasp + autiasp, but I
suppose if we can assume the verifier provides back-edge integrity.

Changes in v3->v4
https://lore.kernel.org/all/fhdcjdzqdqnoehenxbipfaorseeamt3q7fbm7ghe6z5s2chif5@lrhtasolawud/
- Fix authorship attribution

Changes in v2->v3:
https://lore.kernel.org/all/20240324211518.93892-1-puranjay12@gmail.com/
- Simplify cfi_get_func_hash to avoid needless failure case
- Use DEFINE_CFI_TYPE as suggested by Mark Rutland

Changes in v1->v2:
https://lore.kernel.org/bpf/20240227151115.4623-1-puranjay12@gmail.com/
- Rebased on latest bpf-next/master

Mark Rutland (1):
  cfi: add C CFI type macro

Maxwell Bland (1):
  arm64/cfi,bpf: Use DEFINE_CFI_TYPE in arm64

Puranjay Mohan (1):
  arm64/cfi,bpf: Support kCFI + BPF on arm64

 arch/arm64/include/asm/cfi.h    | 23 ++++++++++++++++++++++
 arch/arm64/kernel/alternative.c | 18 +++++++++++++++++
 arch/arm64/net/bpf_jit_comp.c   | 18 +++++++++++++++--
 arch/riscv/kernel/cfi.c         | 34 ++------------------------------
 arch/x86/kernel/alternative.c   | 35 +++------------------------------
 include/linux/cfi_types.h       | 23 ++++++++++++++++++++++
 6 files changed, 85 insertions(+), 66 deletions(-)
 create mode 100644 arch/arm64/include/asm/cfi.h


base-commit: 329a6720a3ebbc041983b267981ab2cac102de93
-- 
2.34.1