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([2620:10d:c090:500::5:d721]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3415c8b5cfcsm1740053a91.19.2025.11.03.10.14.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 03 Nov 2025 10:14:49 -0800 (PST) Message-ID: Subject: Re: [PATCH bpf-next v4 2/2] selftests/bpf: Add test for conditional jumps on same scalar register From: Eduard Zingerman To: KaFai Wan , ast@kernel.org, daniel@iogearbox.net, john.fastabend@gmail.com, andrii@kernel.org, martin.lau@linux.dev, song@kernel.org, yonghong.song@linux.dev, kpsingh@kernel.org, sdf@fomichev.me, haoluo@google.com, jolsa@kernel.org, shuah@kernel.org, paul.chaignon@gmail.com, m.shachnai@gmail.com, harishankar.vishwanathan@gmail.com, colin.i.king@gmail.com, luis.gerhorst@fau.de, bpf@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org Date: Mon, 03 Nov 2025 10:14:47 -0800 In-Reply-To: <20251103063108.1111764-3-kafai.wan@linux.dev> References: <20251103063108.1111764-1-kafai.wan@linux.dev> <20251103063108.1111764-3-kafai.wan@linux.dev> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.56.2 (3.56.2-1.fc42) Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Mon, 2025-11-03 at 14:31 +0800, KaFai Wan wrote: > Add test cases to verify the correctness of the BPF verifier's branch ana= lysis > when conditional jumps are performed on the same scalar register. And mak= e sure > that JGT does not trigger verifier BUG. >=20 > Signed-off-by: KaFai Wan > --- Thank you for adding these. Acked-by: Eduard Zingerman (but a comment needs a fix) [...] > +SEC("socket") > +__description("jset on same register, scalar value unknown branch 3") > +__msg("4: (b7) r0 =3D 0 {{.*}} R0=3D0") > +__msg("6: (b7) r0 =3D 1 {{.*}} R0=3D1") > +__success __log_level(2) > +__flag(BPF_F_TEST_REG_INVARIANTS) > +__naked void jset_on_same_register_5(void *ctx) > +{ > + asm volatile(" \ > + /* range [-1;-1] */ \ ^^ Typo, should be [-1;1]. > + call %[bpf_get_prandom_u32]; \ > + r0 &=3D 0x2; \ > + r0 -=3D 1; \ > + if r0 & r0 goto l1_%=3D; \ > +l0_%=3D: r0 =3D 0; \ > + exit; \ > +l1_%=3D: r0 =3D 1; \ > + exit; \ > +" : > + : __imm(bpf_get_prandom_u32) > + : __clobber_all); > +} > + > char _license[] SEC("license") =3D "GPL";