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([125.121.98.110]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-73bd21c20f3sm3610710b3a.39.2025.04.12.10.06.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 12 Apr 2025 10:06:47 -0700 (PDT) From: KaFai Wan X-Google-Original-From: KaFai Wan To: martin.lau@linux.dev, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, eddyz87@gmail.com, song@kernel.org, yonghong.song@linux.dev, john.fastabend@gmail.com, kpsingh@kernel.org, sdf@fomichev.me, haoluo@google.com, jolsa@kernel.org, mykolal@fb.com, shuah@kernel.org, memxor@gmail.com Cc: bpf@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, kafai.wan@hotmail.com, leon.hwang@linux.dev Subject: [PATCH bpf-next 2/2] selftests/bpf: Add test to access const void pointer argument in tracing program Date: Sun, 13 Apr 2025 01:06:26 +0800 Message-ID: <20250412170626.3638516-3-kafai.wan@hotmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250412170626.3638516-1-kafai.wan@hotmail.com> References: <20250412170626.3638516-1-kafai.wan@hotmail.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Adding verifier test for accessing const void pointer argument in tracing programs. The test program loads 2nd argument of kfree tp_btf which is const void pointer and checks that verifier allows that. Signed-off-by: KaFai Wan --- .../selftests/bpf/progs/verifier_btf_ctx_access.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/tools/testing/selftests/bpf/progs/verifier_btf_ctx_access.c b/tools/testing/selftests/bpf/progs/verifier_btf_ctx_access.c index 28b939572cda..a6cec7f73dcd 100644 --- a/tools/testing/selftests/bpf/progs/verifier_btf_ctx_access.c +++ b/tools/testing/selftests/bpf/progs/verifier_btf_ctx_access.c @@ -65,4 +65,13 @@ __naked void ctx_access_u32_pointer_reject_8(void) " ::: __clobber_all); } +SEC("tp_btf/kfree") +__description("btf_ctx_access const void pointer accept") +int ctx_access_const_void_pointer_accept(void) +{ + /* load 2nd argument value (const void pointer) */ + asm volatile ("r2 = *(u64 *)(r1 + 8); "); + return 0; +} + char _license[] SEC("license") = "GPL";