linux-kernel - Re: [PATCH bpf-next 0/1] Support kCFI + BPF on arm64

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Date: Mon, 11 Mar 2024 18:26:11 -0700
From: Alexei Starovoitov <alexei.starovoitov@...il.com>
To: Puranjay Mohan <puranjay12@...il.com>
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 <linux-arm-kernel@...ts.infradead.org>, 
	open list <linux-kernel@...r.kernel.org>, 
	"open list:BPF [GENERAL] (Safe Dynamic Programs and Tools)" <bpf@...r.kernel.org>, Josh Poimboeuf <jpoimboe@...nel.org>
Subject: Re: [PATCH bpf-next 0/1] Support kCFI + BPF on arm64

On Tue, Feb 27, 2024 at 7:11 AM Puranjay Mohan <puranjay12@...il.com> wrote:
>
> On ARM64 with CONFIG_CFI_CLANG, CFI warnings can be triggered by running
> the bpf selftests. This is because the JIT doesn't emit proper CFI prologues
> for BPF programs, callbacks, and struct_ops trampolines.
>
> Example Warning:
>
>  CFI failure at bpf_rbtree_add_impl+0x120/0x1d4 (target: bpf_prog_fb8b097ab47d164a_less+0x0/0x98; expected type: 0x9e4709a9)
>  WARNING: CPU: 0 PID: 1488 at bpf_rbtree_add_impl+0x120/0x1d4

..

> Running the selftests causes no CFI warnings:
> ---------------------------------------------
>
> test_progs: Summary: 454/3613 PASSED, 62 SKIPPED, 74 FAILED
> test_tag: OK (40945 tests)
> test_verifier: Summary: 789 PASSED, 0 SKIPPED, 0 FAILED

Catalin, Mark,

Could you please review and hopefully ack arm64 generic bits ?

The JIT changes largely mimic x86 changes and look correct to me.