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Message-ID: <ptrugmna4xb5o5lo4xislf4rlz7avdmd4pfho5fjwtjj7v422u@iqrwfrbwuxrq>
Date: Mon, 17 Jun 2024 11:27:17 -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 v7 0/2] Support kCFI + BPF on arm64
Adds CFI checks to BPF dispatchers on aarch64.
E.g.
<bpf_dispatcher_*_func>:
paciasp
stp x29, x30, [sp, #-0x10]!
mov x29, sp
+ ldur w16, [x2, #-0x4]
+ movk w17, #0x1881
+ movk w17, #0xd942, lsl #16
+ cmp w16, w17
+ b.eq <bpf_dispatcher_*_func+0x24>
+ brk #0x8222
blr x2
ldp x29, x30, [sp], #0x10
autiasp
ret
Changes in v6->v7
https://lore.kernel.org/all/illfkwuxwq3adca2h4shibz2xub62kku3g2wte4sqp7xj7cwkb@ckn3qg7zxjuv/
- Squash one of the commits to avoid code churn
Changes in v5->v6
https://lore.kernel.org/all/mafwhrai2nz3u4wn4fu72kvzjm6krs57klc3qqvd2sz2mham6d@x4ukf6xqp4f4/
- Add include for cfi_types, fixing riscv compile error
- Fix authorship sign-off information
Changes in v4->v5
https://lore.kernel.org/all/wtb6czzpvtqq23t4g6hf7on257dtxzdb4fa4nuq3dtq32odmli@xoyyrtthafar/
- Fix failing BPF selftests from misplaced variable declaration
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
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 | 21 +++++++++++++++++---
arch/riscv/kernel/cfi.c | 35 +++------------------------------
arch/x86/kernel/alternative.c | 35 +++------------------------------
include/linux/cfi_types.h | 23 ++++++++++++++++++++++
6 files changed, 88 insertions(+), 67 deletions(-)
create mode 100644 arch/arm64/include/asm/cfi.h
--
2.43.0
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