From: Frederick Lawler <fred@cloudflare.com>
To: kpsingh@kernel.org, revest@chromium.org, jackmanb@chromium.org,
ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org,
kafai@fb.com, songliubraving@fb.com, yhs@fb.com,
john.fastabend@gmail.com, jmorris@namei.org, serge@hallyn.com,
paul@paul-moore.com, stephen.smalley.work@gmail.com,
eparis@parisplace.org, shuah@kernel.org, brauner@kernel.org,
casey@schaufler-ca.com, ebiederm@xmission.com,
bpf@vger.kernel.org, linux-security-module@vger.kernel.org,
selinux@vger.kernel.org, linux-kselftest@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
kernel-team@cloudflare.com,
Frederick Lawler <fred@cloudflare.com>
Subject: [PATCH v2 3/4] selftests/bpf: Add tests verifying bpf lsm create_user_ns hook
Date: Thu, 7 Jul 2022 17:32:27 -0500 [thread overview]
Message-ID: <20220707223228.1940249-4-fred@cloudflare.com> (raw)
In-Reply-To: <20220707223228.1940249-1-fred@cloudflare.com>
The LSM hook create_user_ns was introduced to provide LSM's an
opportunity to block or allow unprivileged user namespace creation. This
test serves two purposes: it provides a test eBPF implementation, and
tests the hook successfully blocks or allows user namespace creation.
This tests 4 cases:
1. Unattached bpf program does not block unpriv user namespace
creation.
2. Attached bpf program allows user namespace creation given
CAP_SYS_ADMIN privileges.
3. Attached bpf program denies user namespace creation for a
user without CAP_SYS_ADMIN.
4. The sleepable implementation loads
Signed-off-by: Frederick Lawler <fred@cloudflare.com>
---
The generic deny_namespace file name is used for future namespace
expansion. I didn't want to limit these files to just the create_user_ns
hook.
Changes since v1:
- Introduce this patch
---
.../selftests/bpf/prog_tests/deny_namespace.c | 88 +++++++++++++++++++
.../selftests/bpf/progs/test_deny_namespace.c | 39 ++++++++
2 files changed, 127 insertions(+)
create mode 100644 tools/testing/selftests/bpf/prog_tests/deny_namespace.c
create mode 100644 tools/testing/selftests/bpf/progs/test_deny_namespace.c
diff --git a/tools/testing/selftests/bpf/prog_tests/deny_namespace.c b/tools/testing/selftests/bpf/prog_tests/deny_namespace.c
new file mode 100644
index 000000000000..a1fb07038dd5
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/deny_namespace.c
@@ -0,0 +1,88 @@
+// SPDX-License-Identifier: GPL-2.0
+#define _GNU_SOURCE
+#include <test_progs.h>
+#include "test_deny_namespace.skel.h"
+#include <sched.h>
+#include "cap_helpers.h"
+
+#define STACK_SIZE (1024 * 1024)
+static char child_stack[STACK_SIZE];
+
+int clone_callback(void *arg)
+{
+ return 0;
+}
+
+static int create_new_user_ns(void)
+{
+ int status;
+ pid_t cpid;
+
+ cpid = clone(clone_callback, child_stack + STACK_SIZE,
+ CLONE_NEWUSER | SIGCHLD, NULL);
+
+ if (cpid == -1)
+ return errno;
+
+ if (cpid == 0)
+ return 0;
+
+ waitpid(cpid, &status, 0);
+ if (WIFEXITED(status))
+ return WEXITSTATUS(status);
+
+ return -1;
+}
+
+static void test_create_user_ns_bpf(void)
+{
+ __u32 cap_mask = 1ULL << CAP_SYS_ADMIN;
+ __u64 old_caps = 0;
+
+ ASSERT_OK(create_new_user_ns(), "priv new user ns");
+
+ cap_disable_effective(cap_mask, &old_caps);
+
+ ASSERT_EQ(create_new_user_ns(), EPERM, "unpriv new user ns");
+
+ if (cap_mask & old_caps)
+ cap_enable_effective(cap_mask, NULL);
+}
+
+static void test_unpriv_create_user_ns_no_bpf(void)
+{
+ __u32 cap_mask = 1ULL << CAP_SYS_ADMIN;
+ __u64 old_caps = 0;
+
+ cap_disable_effective(cap_mask, &old_caps);
+
+ ASSERT_OK(create_new_user_ns(), "no-bpf unpriv new user ns");
+
+ if (cap_mask & old_caps)
+ cap_enable_effective(cap_mask, NULL);
+}
+
+void test_deny_namespace(void)
+{
+ struct test_deny_namespace *skel = NULL;
+ int err;
+
+ if (test__start_subtest("unpriv_create_user_ns_no_bpf"))
+ test_unpriv_create_user_ns_no_bpf();
+
+ skel = test_deny_namespace__open_and_load();
+ if (!ASSERT_OK_PTR(skel, "skel load"))
+ goto close_prog;
+
+ err = test_deny_namespace__attach(skel);
+ if (!ASSERT_OK(err, "attach"))
+ goto close_prog;
+
+ if (test__start_subtest("create_user_ns_bpf"))
+ test_create_user_ns_bpf();
+
+ test_deny_namespace__detach(skel);
+
+close_prog:
+ test_deny_namespace__destroy(skel);
+}
diff --git a/tools/testing/selftests/bpf/progs/test_deny_namespace.c b/tools/testing/selftests/bpf/progs/test_deny_namespace.c
new file mode 100644
index 000000000000..eedede891431
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/test_deny_namespace.c
@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+#include <errno.h>
+#include <linux/capability.h>
+
+struct kernel_cap_struct {
+ __u32 cap[_LINUX_CAPABILITY_U32S_3];
+} __attribute__((preserve_access_index));
+
+struct cred {
+ struct kernel_cap_struct cap_effective;
+} __attribute__((preserve_access_index));
+
+char _license[] SEC("license") = "GPL";
+
+SEC("lsm/create_user_ns")
+int BPF_PROG(test_create_user_ns, const struct cred *cred, int ret)
+{
+ struct kernel_cap_struct caps = cred->cap_effective;
+ int cap_index = CAP_TO_INDEX(CAP_SYS_ADMIN);
+ __u32 cap_mask = CAP_TO_MASK(CAP_SYS_ADMIN);
+
+ if (ret)
+ return 0;
+
+ ret = -EPERM;
+ if (caps.cap[cap_index] & cap_mask)
+ return 0;
+
+ return -EPERM;
+}
+
+SEC("lsm.s/create_user_ns")
+int BPF_PROG(test_sleepable_create_user_ns, const struct cred *cred, int ret)
+{
+ return 0;
+}
--
2.30.2
next prev parent reply other threads:[~2022-07-07 22:33 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-07 22:32 [PATCH v2 0/4] Introduce security_create_user_ns() Frederick Lawler
2022-07-07 22:32 ` [PATCH v2 1/4] security, lsm: " Frederick Lawler
2022-07-07 22:32 ` [PATCH v2 2/4] bpf-lsm: Make bpf_lsm_create_user_ns() sleepable Frederick Lawler
2022-07-07 22:32 ` Frederick Lawler [this message]
2022-07-07 22:32 ` [PATCH v2 4/4] selinux: Implement create_user_ns hook Frederick Lawler
2022-07-20 1:32 ` Paul Moore
2022-07-20 14:57 ` Frederick Lawler
[not found] ` <CA+EEuAhfMrg=goGhWxVW2=i4Z7mVN4GvfzettvX8T+tFcOPKCw@mail.gmail.com>
2022-07-20 14:52 ` Paul Moore
2022-07-08 12:10 ` [PATCH v2 0/4] Introduce security_create_user_ns() Christian Göttsche
2022-07-08 14:01 ` Frederick Lawler
2022-07-08 14:35 ` Christian Brauner
2022-07-08 16:11 ` Casey Schaufler
2022-07-14 14:27 ` Serge E. Hallyn
2022-07-19 19:59 ` Frederick Lawler
2022-07-20 1:32 ` Paul Moore
2022-07-20 21:42 ` Casey Schaufler
2022-07-20 22:39 ` Paul Moore
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