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[86.147.161.204]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-4606f2637ccsm25885849f8f.6.2026.06.14.09.34.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 14 Jun 2026 09:34:48 -0700 (PDT) From: Dhiraj Shah To: bpf@vger.kernel.org Cc: linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, andrii@kernel.org, eddyz87@gmail.com, ast@kernel.org, daniel@iogearbox.net, memxor@gmail.com, martin.lau@linux.dev, song@kernel.org, yonghong.song@linux.dev, jolsa@kernel.org, emil@etsalapatis.com, shuah@kernel.org Subject: [PATCH] selftests/bpf: Add arena direct-value boundary test Date: Sun, 14 Jun 2026 17:33:52 +0100 Message-ID: <20260614163352.1060813-1-find.dhiraj@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Add coverage for direct map value access against BPF_MAP_TYPE_ARENA. For a one-page arena, an offset of PAGE_SIZE - 1 is valid, while PAGE_SIZE is one byte past the end of the mapping and must be rejected. This covers the off-by-one case in arena direct-value range checking. Signed-off-by: Dhiraj Shah --- .../bpf/prog_tests/arena_direct_value.c | 65 +++++++++++++++++++ 1 file changed, 65 insertions(+) create mode 100644 tools/testing/selftests/bpf/prog_tests/arena_direct_value.c diff --git a/tools/testing/selftests/bpf/prog_tests/arena_direct_value.c b/tools/testing/selftests/bpf/prog_tests/arena_direct_value.c new file mode 100644 index 000000000000..00e65af5df6c --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/arena_direct_value.c @@ -0,0 +1,65 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include +#include +#include +#include +#include +#ifndef PAGE_SIZE +#include +#define PAGE_SIZE getpagesize() +#endif + +static int create_arena(void) +{ + LIBBPF_OPTS(bpf_map_create_opts, opts, + .map_flags = BPF_F_MMAPABLE, + ); + + return bpf_map_create(BPF_MAP_TYPE_ARENA, "arena", 0, 0, 1, &opts); +} + +static int load_direct_value_prog(int map_fd, int off) +{ + struct bpf_insn insns[] = { + BPF_LD_MAP_VALUE(BPF_REG_1, map_fd, off), + BPF_MOV64_IMM(BPF_REG_0, 0), + BPF_EXIT_INSN(), + }; + + return bpf_prog_load(BPF_PROG_TYPE_SOCKET_FILTER, NULL, "GPL", + insns, ARRAY_SIZE(insns), NULL); +} + +static void test_direct_value_boundary(void) +{ + void *area = MAP_FAILED; + int map_fd, prog_fd; + + map_fd = create_arena(); + if (!ASSERT_OK_FD(map_fd, "create_arena")) + return; + + area = mmap(NULL, PAGE_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, map_fd, 0); + if (!ASSERT_NEQ(area, MAP_FAILED, "arena_mmap")) + goto out; + + prog_fd = load_direct_value_prog(map_fd, PAGE_SIZE - 1); + if (ASSERT_OK_FD(prog_fd, "last_valid_byte")) + close(prog_fd); + + prog_fd = load_direct_value_prog(map_fd, PAGE_SIZE); + if (!ASSERT_LT(prog_fd, 0, "one_past_end")) + close(prog_fd); + +out: + if (area != MAP_FAILED) + munmap(area, PAGE_SIZE); + close(map_fd); +} + +void test_arena_direct_value(void) +{ + if (test__start_subtest("direct_value_boundary")) + test_direct_value_boundary(); +} -- 2.43.0