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Thu, 02 Apr 2026 21:27:24 -0700 (PDT) Received: from krios ([2604:3d08:487d:cd00::5517]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-35dbe937925sm12970449a91.12.2026.04.02.21.27.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 02 Apr 2026 21:27:24 -0700 (PDT) From: Emil Tsalapatis To: bpf@vger.kernel.org Cc: ast@kernel.org, andrii@kernel.org, memxor@gmail.com, daniel@iogearbox.net, eddyz87@gmail.com, Emil Tsalapatis , Emil Tsalapatis Subject: [PATCH bpf-next v3 2/9] selftests/bpf: Add test for scalar/arena pointer addition Date: Fri, 3 Apr 2026 00:27:13 -0400 Message-ID: <20260403042720.18862-3-emil@etsalapatis.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260403042720.18862-1-emil@etsalapatis.com> References: <20260403042720.18862-1-emil@etsalapatis.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Emil Tsalapatis Add a selftest that ensures scalar += ptr_to_arena instructions are accepted by the verifier. Signed-off-by: Emil Tsalapatis --- .../selftests/bpf/progs/verifier_arena.c | 29 +++++++++++++++++++ 1 file changed, 29 insertions(+) diff --git a/tools/testing/selftests/bpf/progs/verifier_arena.c b/tools/testing/selftests/bpf/progs/verifier_arena.c index c4b8daac4388..450e8f1181cd 100644 --- a/tools/testing/selftests/bpf/progs/verifier_arena.c +++ b/tools/testing/selftests/bpf/progs/verifier_arena.c @@ -477,4 +477,33 @@ int arena_kfuncs_under_bpf_lock(void *ctx) return 0; } +/* + * Test that scalar += PTR_TO_ARENA correctly upgrades the + * destination register to a PTR_TO_ARENA. + */ +SEC("syscall") +__success __retval(0) +int scalar_add_arena_ptr(void *ctx) +{ +#if defined(__BPF_FEATURE_ADDR_SPACE_CAST) + int __arena *result, *arena_ptr; + + /* Needed for the verifier to link the arena to the subprog. */ + volatile char __arena *base = arena_base(&arena); + + /* Passing base here to avoid optimizing it out during compilation. */ + asm volatile ( + "%[arena_ptr] = 8192;" + "%[arena_ptr] = addr_space_cast(%[arena_ptr], 0x0, 0x1);" + "%[result] = 12;" + "%[result] += %[arena_ptr];" + : [result] "=r"(result), + [arena_ptr] "=&r"(arena_ptr) + : "r"(base) + : + ); +#endif + return 0; +} + char _license[] SEC("license") = "GPL"; -- 2.53.0