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[34.16.131.55]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-2f83bc97d25sm2363395a91.5.2025.01.29.14.17.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 29 Jan 2025 14:17:58 -0800 (PST) Date: Wed, 29 Jan 2025 22:17:54 +0000 From: Peilin Ye To: Eduard Zingerman Cc: bpf@vger.kernel.org, linux-arm-kernel@lists.infradead.org, bpf@ietf.org, Xu Kuohai , David Vernet , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Jonathan Corbet , "Paul E. McKenney" , Puranjay Mohan , Catalin Marinas , Will Deacon , Quentin Monnet , Mykola Lysenko , Shuah Khan , Josh Don , Barret Rhoden , Neel Natu , Benjamin Segall , linux-kernel@vger.kernel.org Subject: Re: [PATCH bpf-next v1 3/8] bpf: Introduce load-acquire and store-release instructions Message-ID: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Tue, Jan 28, 2025 at 05:30:19PM -0800, Eduard Zingerman wrote: > On Sat, 2025-01-25 at 02:18 +0000, Peilin Ye wrote: > > +static int check_atomic_store(struct bpf_verifier_env *env, int insn_idx, > > + struct bpf_insn *insn) > > +{ > > + int err; > > + > > + err = check_reg_arg(env, insn->src_reg, SRC_OP); > > + if (err) > > + return err; > > + > > + err = check_reg_arg(env, insn->dst_reg, SRC_OP); > > + if (err) > > + return err; > > + > > + if (is_pointer_value(env, insn->src_reg)) { > > + verbose(env, "R%d leaks addr into mem\n", insn->src_reg); > > + return -EACCES; > > + } > > Nit: this check is done by check_mem_access(), albeit only for > PTR_TO_MEM, I think it's better to be consistent with > what happens for regular stores and avoid this check here. Got it. Unprivileged programs will be able to store-release pointers to the stack, then. I'll update selftests accordingly. Thanks, Peilin Ye