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[108.214.96.168]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-129b3e8dc1fsm4140623c88.8.2026.03.18.04.32.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 Mar 2026 04:32:31 -0700 (PDT) From: Sun Jian To: bpf@vger.kernel.org, linux-kselftest@vger.kernel.org Cc: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, eddyz87@gmail.com, paul.chaignon@gmail.com, shuah@kernel.org, linux-kernel@vger.kernel.org, Sun Jian Subject: [PATCH] selftests/bpf: add a 32-bit bounds deduction case Date: Wed, 18 Mar 2026 19:32:00 +0800 Message-ID: <20260318113200.303824-1-sun.jian.kdev@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit verifier_bounds.c already has 64-bit cross-sign-boundary bounds deduction coverage. Recent 32-bit signed/unsigned intersection tests extended the refinement coverage, but a corresponding negative case is still missing. Add a 32-bit selftest for that case and assert that the program is rejected, confirming that verifier remains conservative there. Signed-off-by: Sun Jian --- .../selftests/bpf/progs/verifier_bounds.c | 20 +++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/tools/testing/selftests/bpf/progs/verifier_bounds.c b/tools/testing/selftests/bpf/progs/verifier_bounds.c index e526315c718a..242c3d6d23b1 100644 --- a/tools/testing/selftests/bpf/progs/verifier_bounds.c +++ b/tools/testing/selftests/bpf/progs/verifier_bounds.c @@ -2037,4 +2037,24 @@ __naked void signed_unsigned_intersection32_case2(void *ctx) : __clobber_all); } +SEC("socket") +__description("32-bit bounds deduction cross sign boundary, two overlaps") +__failure +__flag(BPF_F_TEST_REG_INVARIANTS) +__msg("frame pointer is read only") +__naked void bounds_deduct_two_overlaps_32(void) +{ + asm volatile(" \ + call %[bpf_get_prandom_u32]; \ + r0 = (s8)r0; \ + w1 = 0xffffff80; \ + if w0 > w1 goto l0_%=; \ + if w0 < 128 goto l0_%=; \ + r10 = 0; \ +l0_%=: exit; \ +" : + : __imm(bpf_get_prandom_u32) + : __clobber_all); +} + char _license[] SEC("license") = "GPL"; base-commit: a989fde763f4f24209e4702f50a45be572340e68 -- 2.43.0