linux-kernel - Re: [PATCH 0/2] riscv, bpf: fix reads of thread

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Message-Id: <DC0H1RZKZ3QR.82P8JXIL5NBJ@ventanamicro.com>
Date: Tue, 12 Aug 2025 15:09:09 +0200
From: Radim Krčmář <rkrcmar@...tanamicro.com>
To: "Alexandre Ghiti" <alex@...ti.fr>, <bpf@...r.kernel.org>
Cc: "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@...ichev.me>, "Hao Luo"
 <haoluo@...gle.com>, "Jiri Olsa" <jolsa@...nel.org>,
 Björn Töpel <bjorn@...nel.org>, "Pu Lehui"
 <pulehui@...wei.com>, "Puranjay Mohan" <puranjay@...nel.org>, "Paul
 Walmsley" <paul.walmsley@...ive.com>, "Palmer Dabbelt"
 <palmer@...belt.com>, "Albert Ou" <aou@...s.berkeley.edu>, "Kumar Kartikeya
 Dwivedi" <memxor@...il.com>, <linux-riscv@...ts.infradead.org>,
 <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/2] riscv, bpf: fix reads of thread_info.cpu

2025-08-12T13:37:16+02:00, Alexandre Ghiti <alex@...ti.fr>:
> @Radim: This is the third similar bug, did you check all assembly code 
> (and bpf) to make sure we don't have anymore left or should I?

I looked at load/store instructions, including bpf, and focussed on
patterns where we access non-xlen sized data through an offset.

(Nothing else popped up, but I mostly used grep and cscope as I don't
 know of any semantic tool, so my confidence levels are low.)