From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 830A92FE597; Wed, 13 Aug 2025 20:55:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755118543; cv=none; b=BcYY1f/CZgavt6dWchbV2hQMa4A7gJ+A2ChMGr7sucbaq4on+al1FS7OUZSHqwG7wdCfG8bvdyxz6Gyq8gPM66BpOKF840/rwvN94ilvvVKke7bYcReHQycuD98OJT/Gn7yaMduEgXRjAl50OEzMypslhtF0pjJeAq8kr97WZqQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755118543; c=relaxed/simple; bh=Jlz2qIJe1GtUM9B38XMo3nuVrZvRmVevuwmM1rYKHSw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=jTAU3eeLqfEV0RZw6JSdFebCE2bLNSzUeT4MCdASP2rj2VP8BB24zU5ajyU5TLMIgRsbGr6pIObL51FCatYoImkKsCFFLIez4Y+ujrktvreNvluDdTZ6o5cDLDzIGbVL0Gv6E7srrBJg30cF5dvzUyEYFvx4yAzoPCaDRPABL8U= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=pQO9pAay; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="pQO9pAay" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7E00EC4CEFA; Wed, 13 Aug 2025 20:55:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1755118543; bh=Jlz2qIJe1GtUM9B38XMo3nuVrZvRmVevuwmM1rYKHSw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=pQO9pAay4/2rUE53dsOMtDYDDFR42M1+z73c6TWQz5+CRj5HiTlyjVQkr9dGPn8n2 y5p+zynKVBgmafXUSY414QBIwR4PNiIN8dD89BcOH7Xebvthp1SFsNlCjG0EHyXMUo kXmji5n7ZMZ4xHZ432/pfDfJr7zBojc8nRV8D/iNpaumrSf9FqANAdmrpI+ud9SFT4 gwFM3N77TpfhJvvNC+7Y0FwtRFBBpgIwOh5GQqrPvVPM7LkLNFgzypzCAU5UJLJEpL jEiYh59HzdVvZ4i1fp7RRRuCJrFy9lVNjrXf5+PSUPiSudYRTbcTmU4zLP89BtcKVg VuGCAUn7bfnpg== From: KP Singh 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 Subject: [PATCH v3 05/12] selftests/bpf: Add tests for exclusive maps Date: Wed, 13 Aug 2025 22:55:19 +0200 Message-ID: <20250813205526.2992911-6-kpsingh@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250813205526.2992911-1-kpsingh@kernel.org> References: <20250813205526.2992911-1-kpsingh@kernel.org> Precedence: bulk X-Mailing-List: linux-security-module@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Check if access is denied to another program for an exclusive map Signed-off-by: KP Singh --- .../selftests/bpf/prog_tests/map_excl.c | 56 +++++++++++++++++++ tools/testing/selftests/bpf/progs/map_excl.c | 34 +++++++++++ 2 files changed, 90 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..7a49917c691a --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/map_excl.c @@ -0,0 +1,56 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) 2023. Huawei Technologies Co., Ltd */ +#define _GNU_SOURCE +#include +#include +#include +#include + +#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 Paccess not denied\n"); +out: + map_excl__destroy(skel); + +} + +void test_map_excl(void) +{ + start_libbpf_log_capture(); + if (test__start_subtest("map_excl_allowed")) + test_map_excl_allowed(); + stop_libbpf_log_capture(); + 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..26c32b4f2ce0 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/map_excl.c @@ -0,0 +1,34 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) 2023. Huawei Technologies Co., Ltd */ +#include +#include +#include + +#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