From patchwork Tue Jul 30 11:59:11 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Alexis_Lothor=C3=A9?= X-Patchwork-Id: 815484 Received: from relay3-d.mail.gandi.net (relay3-d.mail.gandi.net [217.70.183.195]) (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 655ED195F22; Tue, 30 Jul 2024 11:59:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.183.195 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722340775; cv=none; b=LYlzeiwWu3S5QKZwyYpqAy2mP6Y81+OgGwwep5+ize5aUnFczrETCPZznCJgNRLLIpiUqjsnM6UmFOKXRbqpBs2pCUk524+LVeXFElKxkYKcWhkSOuqKzEnYLeBStDvZ66zL3XaqM2eJcL9TTsYYUU0j2ITSfgVpwRWnbqyvGMk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722340775; c=relaxed/simple; bh=bFng46TywWA1qcwiXCQr+6wwB4FqtiDuuvEwXl3opRU=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=MWIzDHexVkclW0m5x6J//ac0FazPEOahYZjibU0F3NtBnlRi7W2DTKlPrd4T49or2CytxSYmab94y0MieG34TtVMzpbnahlkHC66xWyHN9pN1edAft1deA5c2f0op/OQ+3Ugp4vJfq6IcjWjnXRAWVgt87vG+XRGD+GFZUvT91M= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com; spf=pass smtp.mailfrom=bootlin.com; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b=P80rYNQw; arc=none smtp.client-ip=217.70.183.195 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bootlin.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b="P80rYNQw" Received: by mail.gandi.net (Postfix) with ESMTPSA id 3588E60009; Tue, 30 Jul 2024 11:59:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1722340766; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=hnKLsdQUhtO0HXqkcJaopxOibAnUmKmSBAHLuOVe3/0=; b=P80rYNQw9XW0VIIJ+VZjytrSHFU7k1MaZP6iVQf5HZNJIMyVjaP1qTReR3Z5UvunSnaWRY 8yUA5DPzzFnCL67bQ9QWw/gx58mNk18kyzfp2tAXjvPCRb+cDLSFHP8K4YRDSVpplDZBXi dDIdrXUC0qNpGjdQXWW53853YaH6Xp4qp8HADSJN6VYEKgUGWkEoDzw0VsgJXyPf1FEGJy FWsXYkHMY5pjCoq6BP1V0lHqwT9VZfrhl4TG8YvxKBtSef4iZ4RmV9MZX3oMOUVBa6aNay zotpigNKg5kz4PLU4/RbTJNX77NEra70HpSosyuu/BF7VdOUFoWanWHoSklzhQ== From: =?utf-8?q?Alexis_Lothor=C3=A9_=28eBPF_Foundation=29?= Date: Tue, 30 Jul 2024 13:59:11 +0200 Subject: [PATCH bpf-next v3 1/3] selftests/bpf: do not disable /dev/null device access in cgroup dev test Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240730-convert_dev_cgroup-v3-1-93e573b74357@bootlin.com> References: <20240730-convert_dev_cgroup-v3-0-93e573b74357@bootlin.com> In-Reply-To: <20240730-convert_dev_cgroup-v3-0-93e573b74357@bootlin.com> To: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Mykola Lysenko , Shuah Khan Cc: ebpf@linuxfoundation.org, Thomas Petazzoni , Alan Maguire , bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, =?utf-8?q?A?= =?utf-8?q?lexis_Lothor=C3=A9_=28eBPF_Foundation=29?= X-Mailer: b4 0.14.1 X-GND-Sasl: alexis.lothore@bootlin.com test_dev_cgroup currently loads a small bpf program allowing any access on urandom and zero devices, disabling access to any other device. It makes migrating this test to test_progs impossible, since this one manipulates extensively /dev/null. Allow /dev/null manipulation in dev_cgroup program to make its usage in test_progs framework possible. Update test_dev_cgroup.c as well to match this change while it has not been removed. Signed-off-by: Alexis Lothoré (eBPF Foundation) --- tools/testing/selftests/bpf/progs/dev_cgroup.c | 4 ++-- tools/testing/selftests/bpf/test_dev_cgroup.c | 18 +++++++++--------- 2 files changed, 11 insertions(+), 11 deletions(-) diff --git a/tools/testing/selftests/bpf/progs/dev_cgroup.c b/tools/testing/selftests/bpf/progs/dev_cgroup.c index 79b54a4fa244..c1dfbd2b56fc 100644 --- a/tools/testing/selftests/bpf/progs/dev_cgroup.c +++ b/tools/testing/selftests/bpf/progs/dev_cgroup.c @@ -41,14 +41,14 @@ int bpf_prog1(struct bpf_cgroup_dev_ctx *ctx) bpf_trace_printk(fmt, sizeof(fmt), ctx->major, ctx->minor); #endif - /* Allow access to /dev/zero and /dev/random. + /* Allow access to /dev/null and /dev/urandom. * Forbid everything else. */ if (ctx->major != 1 || type != BPF_DEVCG_DEV_CHAR) return 0; switch (ctx->minor) { - case 5: /* 1:5 /dev/zero */ + case 3: /* 1:3 /dev/null */ case 9: /* 1:9 /dev/urandom */ return 1; } diff --git a/tools/testing/selftests/bpf/test_dev_cgroup.c b/tools/testing/selftests/bpf/test_dev_cgroup.c index adeaf63cb6fa..33f544f0005a 100644 --- a/tools/testing/selftests/bpf/test_dev_cgroup.c +++ b/tools/testing/selftests/bpf/test_dev_cgroup.c @@ -54,25 +54,25 @@ int main(int argc, char **argv) goto err; } - /* All operations with /dev/zero and and /dev/urandom are allowed, + /* All operations with /dev/null and /dev/urandom are allowed, * everything else is forbidden. */ - assert(system("rm -f /tmp/test_dev_cgroup_null") == 0); - assert(system("mknod /tmp/test_dev_cgroup_null c 1 3")); - assert(system("rm -f /tmp/test_dev_cgroup_null") == 0); - - /* /dev/zero is whitelisted */ assert(system("rm -f /tmp/test_dev_cgroup_zero") == 0); - assert(system("mknod /tmp/test_dev_cgroup_zero c 1 5") == 0); + assert(system("mknod /tmp/test_dev_cgroup_zero c 1 5")); assert(system("rm -f /tmp/test_dev_cgroup_zero") == 0); - assert(system("dd if=/dev/urandom of=/dev/zero count=64") == 0); + /* /dev/null is whitelisted */ + assert(system("rm -f /tmp/test_dev_cgroup_null") == 0); + assert(system("mknod /tmp/test_dev_cgroup_null c 1 3") == 0); + assert(system("rm -f /tmp/test_dev_cgroup_null") == 0); + + assert(system("dd if=/dev/urandom of=/dev/null count=64") == 0); /* src is allowed, target is forbidden */ assert(system("dd if=/dev/urandom of=/dev/full count=64")); /* src is forbidden, target is allowed */ - assert(system("dd if=/dev/random of=/dev/zero count=64")); + assert(system("dd if=/dev/random of=/dev/null count=64")); error = 0; printf("test_dev_cgroup:PASS\n"); From patchwork Tue Jul 30 11:59:12 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Alexis_Lothor=C3=A9?= X-Patchwork-Id: 815483 Received: from relay3-d.mail.gandi.net (relay3-d.mail.gandi.net [217.70.183.195]) (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 95477199230; Tue, 30 Jul 2024 11:59:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.183.195 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722340777; cv=none; b=OFSthdPuygQUArbB5LCqg34vIGk59iM2ZVX2ka0m0J2pVXm4iGuJnZqm8ynp5kztmq60pmaoH4odtcUIQWURPF/JMfPJ8wlWnVA8dxVH9oxfYam8Q+TJOiqv+Pz38KZEwqUMxZ5+txiKY6alOsnUYTuJscL2QoLtYwZdIbeNeAo= ARC-Message-Signature: i=1; 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Tue, 30 Jul 2024 11:59:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1722340767; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=c6U0BaQ/FWgHOAEqug7cSJLGWPRKBnb5UpnKyeZ2uXM=; b=cU4lKVtNQFoALdc1PILUNy0PlYKH7Wkcx38Kb9dOthWxIFu+9Coty6NHOnU3s5eeGBiGTO IBEndgneeoKzOUVDM+kAbP1MUpkXqYQFTZitev8cDdzOprC46uRaUstpU485/JhVyFDIGw 2togXZYfPFml1VAXRMUH0D7zGIZGI75kJ4feHUKuKz8qkTSMomoBZu60xH6Wcicpih61og j/sy73o4ZqynXYO24Fsa8CaxAXrghRUOGtw/5jyLaztKDVGPAHgT2D7HMGt2kCB0wvLi4m 6e8hxE+p+S7WT52ob3DX9nvuE09qlqzHat8QVeEecyGihU7l8u4sRKG0pIPwTw== From: =?utf-8?q?Alexis_Lothor=C3=A9_=28eBPF_Foundation=29?= Date: Tue, 30 Jul 2024 13:59:12 +0200 Subject: [PATCH bpf-next v3 2/3] selftests/bpf: convert test_dev_cgroup to test_progs Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240730-convert_dev_cgroup-v3-2-93e573b74357@bootlin.com> References: <20240730-convert_dev_cgroup-v3-0-93e573b74357@bootlin.com> In-Reply-To: <20240730-convert_dev_cgroup-v3-0-93e573b74357@bootlin.com> To: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Mykola Lysenko , Shuah Khan Cc: ebpf@linuxfoundation.org, Thomas Petazzoni , Alan Maguire , bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, =?utf-8?q?A?= =?utf-8?q?lexis_Lothor=C3=A9_=28eBPF_Foundation=29?= X-Mailer: b4 0.14.1 X-GND-Sasl: alexis.lothore@bootlin.com test_dev_cgroup is defined as a standalone test program, and so is not executed in CI. Convert it to test_progs framework so it is tested automatically in CI, and remove the old test. In order to be able to run it in test_progs, /dev/null must remain usable, so change the new test to test operations on devices 1:3 as valid, and operations on devices 1:5 (/dev/zero) as invalid. Reviewed-by: Alan Maguire Acked-by: Stanislav Fomichev Signed-off-by: Alexis Lothoré (eBPF Foundation) --- Changes in v3: - delete mknod file only when is has been created - use bpf_program__attach_cgroup instead of bpf_prog_attach - reorder subtests - collect review/ack tags Changes in v2: - pass expected return code to subtest function instead of boolean pass/not pass - also pass buffer and buffer size for read/write subtests - fix faulty fd check on read/write tests expected to fail --- tools/testing/selftests/bpf/.gitignore | 1 - tools/testing/selftests/bpf/Makefile | 2 - .../testing/selftests/bpf/prog_tests/cgroup_dev.c | 115 +++++++++++++++++++++ tools/testing/selftests/bpf/test_dev_cgroup.c | 85 --------------- 4 files changed, 115 insertions(+), 88 deletions(-) diff --git a/tools/testing/selftests/bpf/.gitignore b/tools/testing/selftests/bpf/.gitignore index 4e4aae8aa7ec..8f14d8faeb0b 100644 --- a/tools/testing/selftests/bpf/.gitignore +++ b/tools/testing/selftests/bpf/.gitignore @@ -9,7 +9,6 @@ test_lpm_map test_tag FEATURE-DUMP.libbpf fixdep -test_dev_cgroup /test_progs /test_progs-no_alu32 /test_progs-bpf_gcc diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile index 564e1fdf80b6..bb02a3540d7a 100644 --- a/tools/testing/selftests/bpf/Makefile +++ b/tools/testing/selftests/bpf/Makefile @@ -69,7 +69,6 @@ endif # Order correspond to 'make run_tests' order TEST_GEN_PROGS = test_verifier test_tag test_maps test_lru_map test_lpm_map test_progs \ - test_dev_cgroup \ test_sock test_sockmap get_cgroup_id_user \ test_cgroup_storage \ test_tcpnotify_user test_sysctl \ @@ -294,7 +293,6 @@ JSON_WRITER := $(OUTPUT)/json_writer.o CAP_HELPERS := $(OUTPUT)/cap_helpers.o NETWORK_HELPERS := $(OUTPUT)/network_helpers.o -$(OUTPUT)/test_dev_cgroup: $(CGROUP_HELPERS) $(TESTING_HELPERS) $(OUTPUT)/test_skb_cgroup_id_user: $(CGROUP_HELPERS) $(TESTING_HELPERS) $(OUTPUT)/test_sock: $(CGROUP_HELPERS) $(TESTING_HELPERS) $(OUTPUT)/test_sockmap: $(CGROUP_HELPERS) $(TESTING_HELPERS) diff --git a/tools/testing/selftests/bpf/prog_tests/cgroup_dev.c b/tools/testing/selftests/bpf/prog_tests/cgroup_dev.c new file mode 100644 index 000000000000..62a2ca9a0b94 --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/cgroup_dev.c @@ -0,0 +1,115 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include +#include +#include "test_progs.h" +#include "cgroup_helpers.h" +#include "dev_cgroup.skel.h" + +#define TEST_CGROUP "/test-bpf-based-device-cgroup/" +#define TEST_BUFFER_SIZE 64 + +static void test_mknod(const char *path, mode_t mode, int dev_major, + int dev_minor, int expected_ret) +{ + int ret; + + unlink(path); + ret = mknod(path, mode, makedev(dev_major, dev_minor)); + ASSERT_EQ(ret, expected_ret, "mknod"); + if (!ret) + unlink(path); +} + +static void test_read(const char *path, char *buf, int buf_size, + int expected_ret) +{ + int ret, fd; + + fd = open(path, O_RDONLY); + + /* A bare open on unauthorized device should fail */ + if (expected_ret < 0) { + ASSERT_EQ(fd, expected_ret, "open file for read"); + if (fd >= 0) + close(fd); + return; + } + + if (!ASSERT_OK_FD(fd, "open file for read")) + return; + + ret = read(fd, buf, buf_size); + ASSERT_EQ(ret, expected_ret, "read"); + + close(fd); +} + +static void test_write(const char *path, char *buf, int buf_size, + int expected_ret) +{ + int ret, fd; + + fd = open(path, O_WRONLY); + + /* A bare open on unauthorized device should fail */ + if (expected_ret < 0) { + ASSERT_EQ(fd, expected_ret, "open file for write"); + if (fd >= 0) + close(fd); + return; + } + + if (!ASSERT_OK_FD(fd, "open file for write")) + return; + + ret = write(fd, buf, buf_size); + ASSERT_EQ(ret, expected_ret, "write"); + + close(fd); +} + +void test_cgroup_dev(void) +{ + char buf[TEST_BUFFER_SIZE] = "some random test data"; + struct dev_cgroup *skel; + int cgroup_fd; + + cgroup_fd = cgroup_setup_and_join(TEST_CGROUP); + if (!ASSERT_OK_FD(cgroup_fd, "cgroup switch")) + return; + + skel = dev_cgroup__open_and_load(); + if (!ASSERT_OK_PTR(skel, "load program")) + goto cleanup_cgroup; + + skel->links.bpf_prog1 = + bpf_program__attach_cgroup(skel->progs.bpf_prog1, cgroup_fd); + if (!ASSERT_OK_PTR(skel->links.bpf_prog1, "attach_program")) + goto cleanup_progs; + + if (test__start_subtest("allow-mknod")) + test_mknod("/dev/test_dev_cgroup_null", S_IFCHR, 1, 3, 0); + + if (test__start_subtest("allow-read")) + test_read("/dev/urandom", buf, TEST_BUFFER_SIZE, + TEST_BUFFER_SIZE); + + if (test__start_subtest("allow-write")) + test_write("/dev/null", buf, TEST_BUFFER_SIZE, + TEST_BUFFER_SIZE); + + if (test__start_subtest("deny-mknod")) + test_mknod("/dev/test_dev_cgroup_zero", S_IFCHR, 1, 5, -EPERM); + + if (test__start_subtest("deny-read")) + test_read("/dev/random", buf, TEST_BUFFER_SIZE, -EPERM); + + if (test__start_subtest("deny-write")) + test_write("/dev/zero", buf, TEST_BUFFER_SIZE, -EPERM); + +cleanup_progs: + dev_cgroup__destroy(skel); +cleanup_cgroup: + cleanup_cgroup_environment(); +} diff --git a/tools/testing/selftests/bpf/test_dev_cgroup.c b/tools/testing/selftests/bpf/test_dev_cgroup.c deleted file mode 100644 index 33f544f0005a..000000000000 --- a/tools/testing/selftests/bpf/test_dev_cgroup.c +++ /dev/null @@ -1,85 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* Copyright (c) 2017 Facebook - */ - -#include -#include -#include -#include -#include -#include - -#include -#include -#include - -#include "cgroup_helpers.h" -#include "testing_helpers.h" - -#define DEV_CGROUP_PROG "./dev_cgroup.bpf.o" - -#define TEST_CGROUP "/test-bpf-based-device-cgroup/" - -int main(int argc, char **argv) -{ - struct bpf_object *obj; - int error = EXIT_FAILURE; - int prog_fd, cgroup_fd; - __u32 prog_cnt; - - /* Use libbpf 1.0 API mode */ - libbpf_set_strict_mode(LIBBPF_STRICT_ALL); - - if (bpf_prog_test_load(DEV_CGROUP_PROG, BPF_PROG_TYPE_CGROUP_DEVICE, - &obj, &prog_fd)) { - printf("Failed to load DEV_CGROUP program\n"); - goto out; - } - - cgroup_fd = cgroup_setup_and_join(TEST_CGROUP); - if (cgroup_fd < 0) { - printf("Failed to create test cgroup\n"); - goto out; - } - - /* Attach bpf program */ - if (bpf_prog_attach(prog_fd, cgroup_fd, BPF_CGROUP_DEVICE, 0)) { - printf("Failed to attach DEV_CGROUP program"); - goto err; - } - - if (bpf_prog_query(cgroup_fd, BPF_CGROUP_DEVICE, 0, NULL, NULL, - &prog_cnt)) { - printf("Failed to query attached programs"); - goto err; - } - - /* All operations with /dev/null and /dev/urandom are allowed, - * everything else is forbidden. - */ - assert(system("rm -f /tmp/test_dev_cgroup_zero") == 0); - assert(system("mknod /tmp/test_dev_cgroup_zero c 1 5")); - assert(system("rm -f /tmp/test_dev_cgroup_zero") == 0); - - /* /dev/null is whitelisted */ - assert(system("rm -f /tmp/test_dev_cgroup_null") == 0); - assert(system("mknod /tmp/test_dev_cgroup_null c 1 3") == 0); - assert(system("rm -f /tmp/test_dev_cgroup_null") == 0); - - assert(system("dd if=/dev/urandom of=/dev/null count=64") == 0); - - /* src is allowed, target is forbidden */ - assert(system("dd if=/dev/urandom of=/dev/full count=64")); - - /* src is forbidden, target is allowed */ - assert(system("dd if=/dev/random of=/dev/null count=64")); - - error = 0; - printf("test_dev_cgroup:PASS\n"); - -err: - cleanup_cgroup_environment(); - -out: - return error; -}