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Tue, 12 Aug 2025 06:09:09 -0700 (PDT) Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Tue, 12 Aug 2025 15:09:09 +0200 Message-Id: Subject: Re: [PATCH 0/2] riscv, bpf: fix reads of thread_info.cpu Cc: "Alexei Starovoitov" , "Daniel Borkmann" , "Andrii Nakryiko" , "Martin KaFai Lau" , "Eduard Zingerman" , "Song Liu" , "Yonghong Song" , "John Fastabend" , "KP Singh" , "Stanislav Fomichev" , "Hao Luo" , "Jiri Olsa" , =?utf-8?q?Bj=C3=B6rn_T=C3=B6pel?= , "Pu Lehui" , "Puranjay Mohan" , "Paul Walmsley" , "Palmer Dabbelt" , "Albert Ou" , "Kumar Kartikeya Dwivedi" , , To: "Alexandre Ghiti" , From: =?utf-8?q?Radim_Kr=C4=8Dm=C3=A1=C5=99?= References: <20250812090256.757273-2-rkrcmar@ventanamicro.com> <1fdaa939-d26c-454a-a722-7d0a590557b7@ghiti.fr> In-Reply-To: <1fdaa939-d26c-454a-a722-7d0a590557b7@ghiti.fr> 2025-08-12T13:37:16+02:00, Alexandre Ghiti : > @Radim: This is the third similar bug, did you check all assembly code=20 > (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.)