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 89A112D47FA; Sun, 21 Sep 2025 13:31:50 +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=1758461510; cv=none; b=K30ev5F21mP5wbKYgf8fFKeRu2NlQvQrHO8zRUnkNEKCxvAzFJBlIHTNvtlzzYEmwEZWf7TGZV99PzCDBeJk9laKnlmbq2ub1yX/iAgT2FukxymkFUjX2AAYZIue3lGo2htmoyKoD107NJccXFkXpkH3j1jaeXR/viuZSeHoeys= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758461510; c=relaxed/simple; bh=0y+UJa/JPWyRIrLzDd6oJLvZcJqjApQ21JC1cX8b5fQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=qhGoMBbUQQOkoaKMIWxm1rhnDmhjzxvrLGTe4dxjZekc2cSyZQJONyZ7VTDtC/Y5qqf7buuGcjock4B6Bknbjp03lGldeEsliecCVhIHZc+YszRZhQid8EXqife4TMEn7EvLbKF1UG6oOBCKeu2ja31dnN5yramLpWz0zMUWo2s= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=anBzfMb6; 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="anBzfMb6" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 37F03C4CEE7; Sun, 21 Sep 2025 13:31:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1758461510; bh=0y+UJa/JPWyRIrLzDd6oJLvZcJqjApQ21JC1cX8b5fQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=anBzfMb6n+WcWFc6BvYVdoT5IwZg5l2j64lh1ttn04MW/DimJ+pjLBp3pSM2+EUv5 nRdshe3qwUKEVaN7OU3tEWO2wJNPAZdTPNlXQTT69yt585WVfoi3a/QgwXpQbEjV19 b9OPYfXRtXjyFzsBvyHijY3jN6uFSqUp0Xuona3sfBRfMmPCznoG21knSmLX72QnrH /+84Xf1bU1ftf609idY16vv6PxsQ/pSpIwQHObgKzPPhF38r0xZwjmaOPcjkbIbLPv jWJ6+1f0e+2+ejcr6eqVyBsqS68WYdnv//4iVmbWTbFFJ1LbUzYtd1GmsiPl/NRf+y AYWlczjfsYlDw== 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 v5 05/12] selftests/bpf: Add tests for exclusive maps Date: Sun, 21 Sep 2025 15:31:26 +0200 Message-ID: <20250921133133.82062-6-kpsingh@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250921133133.82062-1-kpsingh@kernel.org> References: <20250921133133.82062-1-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 | 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 +#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 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 +#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