From: KP Singh <kpsingh@chromium.org>
To: linux-kernel@vger.kernel.org, bpf@vger.kernel.org,
linux-security-module@vger.kernel.org
Cc: "Alexei Starovoitov" <ast@kernel.org>,
"Daniel Borkmann" <daniel@iogearbox.net>,
"James Morris" <jmorris@namei.org>,
"Kees Cook" <keescook@chromium.org>,
"Thomas Garnier" <thgarnie@chromium.org>,
"Michael Halcrow" <mhalcrow@google.com>,
"Paul Turner" <pjt@google.com>,
"Brendan Gregg" <brendan.d.gregg@gmail.com>,
"Jann Horn" <jannh@google.com>,
"Matthew Garrett" <mjg59@google.com>,
"Christian Brauner" <christian@brauner.io>,
"Mickaël Salaün" <mic@digikod.net>,
"Florent Revest" <revest@chromium.org>,
"Brendan Jackman" <jackmanb@chromium.org>,
"Martin KaFai Lau" <kafai@fb.com>,
"Song Liu" <songliubraving@fb.com>, "Yonghong Song" <yhs@fb.com>,
"Serge E. Hallyn" <serge@hallyn.com>,
"Mauro Carvalho Chehab" <mchehab+samsung@kernel.org>,
"David S. Miller" <davem@davemloft.net>,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
"Nicolas Ferre" <nicolas.ferre@microchip.com>,
"Stanislav Fomichev" <sdf@google.com>,
"Quentin Monnet" <quentin.monnet@netronome.com>,
"Andrey Ignatov" <rdna@fb.com>, "Joe Stringer" <joe@wand.net.nz>
Subject: [PATCH bpf-next v2 09/10] bpf: lsm: Add selftests for BPF_PROG_TYPE_LSM
Date: Wed, 15 Jan 2020 18:13:32 +0100 [thread overview]
Message-ID: <20200115171333.28811-10-kpsingh@chromium.org> (raw)
In-Reply-To: <20200115171333.28811-1-kpsingh@chromium.org>
From: KP Singh <kpsingh@google.com>
* Load a BPF program that audits mprotect calls
* Attach the program to the "file_mprotect" LSM hook
* Initialize the perf events buffer and poll for audit events
* Do an mprotect on some memory allocated on the heap
* Verify if the audit event was received
Signed-off-by: KP Singh <kpsingh@google.com>
---
MAINTAINERS | 2 +
tools/testing/selftests/bpf/lsm_helpers.h | 19 ++++++
.../bpf/prog_tests/lsm_mprotect_audit.c | 58 +++++++++++++++++++
.../selftests/bpf/progs/lsm_mprotect_audit.c | 48 +++++++++++++++
4 files changed, 127 insertions(+)
create mode 100644 tools/testing/selftests/bpf/lsm_helpers.h
create mode 100644 tools/testing/selftests/bpf/prog_tests/lsm_mprotect_audit.c
create mode 100644 tools/testing/selftests/bpf/progs/lsm_mprotect_audit.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 02d7e05e9b75..5d553c2e7452 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -3210,6 +3210,8 @@ L: bpf@vger.kernel.org
S: Maintained
F: security/bpf/
F: include/linux/bpf_lsm.h
+F: tools/testing/selftests/bpf/progs/lsm_mprotect_audit.c
+F: tools/testing/selftests/bpf/prog_tests/lsm_mprotect_audit.c
BROADCOM B44 10/100 ETHERNET DRIVER
M: Michael Chan <michael.chan@broadcom.com>
diff --git a/tools/testing/selftests/bpf/lsm_helpers.h b/tools/testing/selftests/bpf/lsm_helpers.h
new file mode 100644
index 000000000000..8bad08f77654
--- /dev/null
+++ b/tools/testing/selftests/bpf/lsm_helpers.h
@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+/*
+ * Copyright 2019 Google LLC.
+ */
+#ifndef _LSM_HELPERS_H
+#define _LSM_HELPERS_H
+
+struct lsm_mprotect_audit_result {
+ /* This ensures that the LSM Hook only monitors the PID requested
+ * by the loader
+ */
+ __u32 monitored_pid;
+ /* The number of mprotect calls for the monitored PID.
+ */
+ __u32 mprotect_count;
+};
+
+#endif /* _LSM_HELPERS_H */
diff --git a/tools/testing/selftests/bpf/prog_tests/lsm_mprotect_audit.c b/tools/testing/selftests/bpf/prog_tests/lsm_mprotect_audit.c
new file mode 100644
index 000000000000..ff90b874eafc
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/lsm_mprotect_audit.c
@@ -0,0 +1,58 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * Copyright 2019 Google LLC.
+ */
+
+#include <test_progs.h>
+#include <sys/mman.h>
+#include <unistd.h>
+#include <malloc.h>
+#include "lsm_helpers.h"
+#include "lsm_mprotect_audit.skel.h"
+
+int heap_mprotect(void)
+{
+ void *buf;
+ long sz;
+
+ sz = sysconf(_SC_PAGESIZE);
+ if (sz < 0)
+ return sz;
+
+ buf = memalign(sz, 2 * sz);
+ if (buf == NULL)
+ return -ENOMEM;
+
+ return mprotect(buf, sz, PROT_READ | PROT_EXEC);
+}
+
+void test_lsm_mprotect_audit(void)
+{
+ struct lsm_mprotect_audit_result *result;
+ struct lsm_mprotect_audit *skel = NULL;
+ int err, duration = 0;
+
+ skel = lsm_mprotect_audit__open_and_load();
+ if (CHECK(!skel, "skel_load", "lsm_mprotect_audit skeleton failed\n"))
+ goto close_prog;
+
+ err = lsm_mprotect_audit__attach(skel);
+ if (CHECK(err, "attach", "lsm_mprotect_audit attach failed: %d\n", err))
+ goto close_prog;
+
+ result = &skel->bss->result;
+ result->monitored_pid = getpid();
+
+ err = heap_mprotect();
+ if (CHECK(err < 0, "heap_mprotect", "err %d errno %d\n", err, errno))
+ goto close_prog;
+
+ /* Make sure mprotect_audit program was triggered
+ * and detected an mprotect on the heap.
+ */
+ CHECK_FAIL(result->mprotect_count != 1);
+
+close_prog:
+ lsm_mprotect_audit__destroy(skel);
+}
diff --git a/tools/testing/selftests/bpf/progs/lsm_mprotect_audit.c b/tools/testing/selftests/bpf/progs/lsm_mprotect_audit.c
new file mode 100644
index 000000000000..f4569b418616
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/lsm_mprotect_audit.c
@@ -0,0 +1,48 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * Copyright 2019 Google LLC.
+ */
+
+#include <linux/bpf.h>
+#include <stdbool.h>
+#include "bpf_helpers.h"
+#include "bpf_trace_helpers.h"
+#include "lsm_helpers.h"
+
+char _license[] SEC("license") = "GPL";
+
+struct lsm_mprotect_audit_result result = {
+ .mprotect_count = 0,
+ .monitored_pid = 0,
+};
+
+/*
+ * Define some of the structs used in the BPF program.
+ * Only the field names and their sizes need to be the
+ * same as the kernel type, the order is irrelevant.
+ */
+struct mm_struct {
+ unsigned long start_brk, brk;
+} __attribute__((preserve_access_index));
+
+struct vm_area_struct {
+ unsigned long vm_start, vm_end;
+ struct mm_struct *vm_mm;
+} __attribute__((preserve_access_index));
+
+SEC("lsm/file_mprotect")
+int BPF_PROG(mprotect_audit, struct vm_area_struct *vma,
+ unsigned long reqprot, unsigned long prot)
+{
+ __u32 pid = bpf_get_current_pid_tgid();
+ int is_heap = 0;
+
+ is_heap = (vma->vm_start >= vma->vm_mm->start_brk &&
+ vma->vm_end <= vma->vm_mm->brk);
+
+ if (is_heap && result.monitored_pid == pid)
+ result.mprotect_count++;
+
+ return 0;
+}
--
2.20.1
next prev parent reply other threads:[~2020-01-15 17:13 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-15 17:13 [PATCH bpf-next v2 00/10] MAC and Audit policy using eBPF (KRSI) KP Singh
2020-01-15 17:13 ` [PATCH bpf-next v2 01/10] bpf: btf: Make some of the API visible outside BTF KP Singh
2020-01-18 12:44 ` kbuild test robot
2020-01-20 11:00 ` KP Singh
2020-01-15 17:13 ` [PATCH bpf-next v2 02/10] bpf: lsm: Add a skeleton and config options KP Singh
2020-01-16 7:04 ` Casey Schaufler
2020-01-16 12:52 ` KP Singh
2020-01-15 17:13 ` [PATCH bpf-next v2 03/10] bpf: lsm: Introduce types for eBPF based LSM KP Singh
2020-01-15 17:13 ` [PATCH bpf-next v2 04/10] bpf: lsm: Add mutable hooks list for the BPF LSM KP Singh
2020-01-15 17:30 ` Stephen Smalley
2020-01-16 9:48 ` KP Singh
2020-01-16 6:33 ` Casey Schaufler
2020-01-16 10:19 ` KP Singh
2020-01-15 17:13 ` [PATCH bpf-next v2 05/10] bpf: lsm: BTF API for LSM hooks KP Singh
2020-01-17 0:28 ` Andrii Nakryiko
2020-01-20 11:10 ` KP Singh
2020-01-15 17:13 ` [PATCH bpf-next v2 06/10] bpf: lsm: Implement attach, detach and execution KP Singh
2020-01-15 17:24 ` Greg Kroah-Hartman
2020-01-16 9:45 ` KP Singh
2020-01-15 17:13 ` [PATCH bpf-next v2 07/10] bpf: lsm: Make the allocated callback RO+X KP Singh
2020-01-15 17:13 ` [PATCH bpf-next v2 08/10] tools/libbpf: Add support for BPF_PROG_TYPE_LSM KP Singh
2020-01-15 21:19 ` Andrii Nakryiko
2020-01-15 21:37 ` Andrii Nakryiko
2020-01-16 12:49 ` KP Singh
2020-01-16 17:26 ` KP Singh
2020-01-16 19:10 ` Andrii Nakryiko
2020-01-17 22:16 ` KP Singh
2020-01-15 17:13 ` KP Singh [this message]
2020-01-15 17:13 ` [PATCH bpf-next v2 10/10] bpf: lsm: Add Documentation KP Singh
2020-01-15 22:12 ` [PATCH bpf-next v2 00/10] MAC and Audit policy using eBPF (KRSI) Andrii Nakryiko
2020-01-20 11:12 ` KP Singh
2020-01-16 10:03 ` Brendan Jackman
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