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

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Message-ID: <20250812090256.757273-2-rkrcmar@ventanamicro.com>
Date: Tue, 12 Aug 2025 11:02:54 +0200
From: Radim Krčmář <rkrcmar@...tanamicro.com>
To: 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>,
	Alexandre Ghiti <alex@...ti.fr>,
	Kumar Kartikeya Dwivedi <memxor@...il.com>,
	linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 0/2] riscv, bpf: fix reads of thread_info.cpu

Hello,

These patches are related to a recently queued series [1] that fixes the
same bugs in normal code.  That series finishes with a patch that would
have exposed the BPF bugs, but luckily it won't get merged until v6.18.

I don't know enough about BPF to verify that it emits the correct code
now, so any pointers are welcome.

1: https://lore.kernel.org/linux-riscv/20250725165410.2896641-3-rkrcmar@ventanamicro.com/

Radim Krčmář (2):
  riscv, bpf: use lw when reading int cpu in BPF_MOV64_PERCPU_REG
  riscv, bpf: use lw when reading int cpu in bpf_get_smp_processor_id

 arch/riscv/net/bpf_jit_comp64.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

-- 
2.50.0