From: KP Singh <kpsingh@kernel.org>
To: bpf@vger.kernel.org, linux-security-module@vger.kernel.org
Cc: bboscaccy@linux.microsoft.com, paul@paul-moore.com,
kys@microsoft.com, ast@kernel.org, daniel@iogearbox.net,
andrii@kernel.org, KP Singh <kpsingh@kernel.org>
Subject: [PATCH v5 05/12] selftests/bpf: Add tests for exclusive maps
Date: Sun, 21 Sep 2025 15:31:26 +0200 [thread overview]
Message-ID: <20250921133133.82062-6-kpsingh@kernel.org> (raw)
In-Reply-To: <20250921133133.82062-1-kpsingh@kernel.org>
Check if access is denied to another program for an exclusive map
Signed-off-by: KP Singh <kpsingh@kernel.org>
---
.../selftests/bpf/prog_tests/map_excl.c | 54 +++++++++++++++++++
tools/testing/selftests/bpf/progs/map_excl.c | 34 ++++++++++++
2 files changed, 88 insertions(+)
create mode 100644 tools/testing/selftests/bpf/prog_tests/map_excl.c
create mode 100644 tools/testing/selftests/bpf/progs/map_excl.c
diff --git a/tools/testing/selftests/bpf/prog_tests/map_excl.c b/tools/testing/selftests/bpf/prog_tests/map_excl.c
new file mode 100644
index 000000000000..6bdc6d6de0da
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/map_excl.c
@@ -0,0 +1,54 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (C) 2025 Google LLC. */
+#define _GNU_SOURCE
+#include <unistd.h>
+#include <sys/syscall.h>
+#include <test_progs.h>
+#include <bpf/btf.h>
+
+#include "map_excl.skel.h"
+
+static void test_map_excl_allowed(void)
+{
+ struct map_excl *skel = map_excl__open();
+ int err;
+
+ err = bpf_map__set_exclusive_program(skel->maps.excl_map, skel->progs.should_have_access);
+ if (!ASSERT_OK(err, "bpf_map__set_exclusive_program"))
+ goto out;
+
+ bpf_program__set_autoload(skel->progs.should_have_access, true);
+ bpf_program__set_autoload(skel->progs.should_not_have_access, false);
+
+ err = map_excl__load(skel);
+ ASSERT_OK(err, "map_excl__load");
+out:
+ map_excl__destroy(skel);
+}
+
+static void test_map_excl_denied(void)
+{
+ struct map_excl *skel = map_excl__open();
+ int err;
+
+ err = bpf_map__set_exclusive_program(skel->maps.excl_map, skel->progs.should_have_access);
+ if (!ASSERT_OK(err, "bpf_map__make_exclusive"))
+ goto out;
+
+ bpf_program__set_autoload(skel->progs.should_have_access, false);
+ bpf_program__set_autoload(skel->progs.should_not_have_access, true);
+
+ err = map_excl__load(skel);
+ ASSERT_EQ(err, -EACCES, "exclusive map access not denied\n");
+out:
+ map_excl__destroy(skel);
+
+}
+
+void test_map_excl(void)
+{
+ if (test__start_subtest("map_excl_allowed"))
+ test_map_excl_allowed();
+ if (test__start_subtest("map_excl_denied"))
+ test_map_excl_denied();
+}
diff --git a/tools/testing/selftests/bpf/progs/map_excl.c b/tools/testing/selftests/bpf/progs/map_excl.c
new file mode 100644
index 000000000000..d461684728e4
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/map_excl.c
@@ -0,0 +1,34 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (C) 2025 Google LLC. */
+#include <linux/bpf.h>
+#include <time.h>
+#include <bpf/bpf_helpers.h>
+
+#include "bpf_misc.h"
+
+struct {
+ __uint(type, BPF_MAP_TYPE_ARRAY);
+ __type(key, __u32);
+ __type(value, __u32);
+ __uint(max_entries, 1);
+} excl_map SEC(".maps");
+
+char _license[] SEC("license") = "GPL";
+
+SEC("?fentry.s/" SYS_PREFIX "sys_getpgid")
+int should_have_access(void *ctx)
+{
+ int key = 0, value = 0xdeadbeef;
+
+ bpf_map_update_elem(&excl_map, &key, &value, 0);
+ return 0;
+}
+
+SEC("?fentry.s/" SYS_PREFIX "sys_getpgid")
+int should_not_have_access(void *ctx)
+{
+ int key = 0, value = 0xdeadbeef;
+
+ bpf_map_update_elem(&excl_map, &key, &value, 0);
+ return 0;
+}
--
2.43.0
next prev parent reply other threads:[~2025-09-21 13:31 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-21 13:31 [PATCH v5 00/12] Signed BPF programs KP Singh
2025-09-21 13:31 ` [PATCH v5 01/12] bpf: Update the bpf_prog_calc_tag to use SHA256 KP Singh
2025-09-21 13:31 ` [PATCH v5 02/12] bpf: Implement exclusive map creation KP Singh
2025-09-21 13:31 ` [PATCH v5 03/12] libbpf: Implement SHA256 internal helper KP Singh
2025-09-27 21:03 ` Eric Biggers
2025-09-27 22:33 ` Alexei Starovoitov
2025-09-27 23:04 ` Eric Biggers
2025-09-21 13:31 ` [PATCH v5 04/12] libbpf: Support exclusive map creation KP Singh
2025-09-21 13:31 ` KP Singh [this message]
2025-09-21 13:31 ` [PATCH v5 06/12] bpf: Return hashes of maps in BPF_OBJ_GET_INFO_BY_FD KP Singh
2025-09-21 13:31 ` [PATCH v5 07/12] bpf: Move the signature kfuncs to helpers.c KP Singh
2025-09-21 13:31 ` [PATCH v5 08/12] bpf: Implement signature verification for BPF programs KP Singh
2025-09-21 13:31 ` [PATCH v5 09/12] libbpf: Update light skeleton for signing KP Singh
2025-09-21 13:31 ` [PATCH v5 10/12] libbpf: Embed and verify the metadata hash in the loader KP Singh
2025-09-21 13:31 ` [PATCH v5 11/12] bpftool: Add support for signing BPF programs KP Singh
2025-09-21 13:31 ` [PATCH v5 12/12] selftests/bpf: Enable signature verification for some lskel tests KP Singh
2025-09-21 15:31 ` [PATCH v5 00/12] Signed BPF programs Alexei Starovoitov
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