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Message-ID: <20250321164537.16719-5-bboscaccy@linux.microsoft.com>
Date: Fri, 21 Mar 2025 09:45:06 -0700
From: Blaise Boscaccy <bboscaccy@...ux.microsoft.com>
To: Jonathan Corbet <corbet@....net>,
David Howells <dhowells@...hat.com>,
Herbert Xu <herbert@...dor.apana.org.au>,
"David S. Miller" <davem@...emloft.net>,
Paul Moore <paul@...l-moore.com>,
James Morris <jmorris@...ei.org>,
"Serge E. Hallyn" <serge@...lyn.com>,
Masahiro Yamada <masahiroy@...nel.org>,
Nathan Chancellor <nathan@...nel.org>,
Nicolas Schier <nicolas@...sle.eu>,
Shuah Khan <shuah@...nel.org>,
Mickaël Salaün <mic@...ikod.net>,
Günther Noack <gnoack@...gle.com>,
Nick Desaulniers <nick.desaulniers+lkml@...il.com>,
Bill Wendling <morbo@...gle.com>,
Justin Stitt <justinstitt@...gle.com>,
Blaise Boscaccy <bboscaccy@...ux.microsoft.com>,
Jarkko Sakkinen <jarkko@...nel.org>,
Jan Stancek <jstancek@...hat.com>,
Neal Gompa <neal@...pa.dev>,
linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org,
keyrings@...r.kernel.org,
linux-crypto@...r.kernel.org,
linux-security-module@...r.kernel.org,
linux-kbuild@...r.kernel.org,
linux-kselftest@...r.kernel.org,
bpf@...r.kernel.org,
llvm@...ts.linux.dev,
nkapron@...gle.com,
teknoraver@...a.com,
roberto.sassu@...wei.com,
xiyou.wangcong@...il.com
Subject: [RFC PATCH security-next 4/4] selftests/hornet: Add a selftest for the hornet LSM
This selftest tests contains a simple testcase that utilizes an lskel
loader. One version of the lskel is signed with the autogenerated
module signing key, another is not. A test driver attempts to load the
lskels. With hornet enabled, the signed version should successfully be
loaded, and the unsigned version should fail.
Signed-off-by: Blaise Boscaccy <bboscaccy@...ux.microsoft.com>
---
tools/testing/selftests/Makefile | 1 +
tools/testing/selftests/hornet/Makefile | 51 ++++++++++++++++++++
tools/testing/selftests/hornet/loader.c | 21 ++++++++
tools/testing/selftests/hornet/trivial.bpf.c | 33 +++++++++++++
4 files changed, 106 insertions(+)
create mode 100644 tools/testing/selftests/hornet/Makefile
create mode 100644 tools/testing/selftests/hornet/loader.c
create mode 100644 tools/testing/selftests/hornet/trivial.bpf.c
diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
index 8daac70c2f9d2..fce32ee4de328 100644
--- a/tools/testing/selftests/Makefile
+++ b/tools/testing/selftests/Makefile
@@ -41,6 +41,7 @@ TARGETS += ftrace
TARGETS += futex
TARGETS += gpio
TARGETS += hid
+TARGETS += hornet
TARGETS += intel_pstate
TARGETS += iommu
TARGETS += ipc
diff --git a/tools/testing/selftests/hornet/Makefile b/tools/testing/selftests/hornet/Makefile
new file mode 100644
index 0000000000000..93da70f41d40c
--- /dev/null
+++ b/tools/testing/selftests/hornet/Makefile
@@ -0,0 +1,51 @@
+# SPDX-License-Identifier: GPL-2.0
+include ../../../build/Build.include
+include ../../../scripts/Makefile.arch
+include ../../../scripts/Makefile.include
+
+CLANG ?= clang
+CFLAGS := -g -O2 -Wall
+BPFTOOL ?= bpftool
+SCRIPTSDIR := $(abspath ../../../../scripts/hornet)
+TOOLSDIR := $(abspath ../../..)
+LIBDIR := $(TOOLSDIR)/lib
+BPFDIR := $(LIBDIR)/bpf
+TOOLSINCDIR := $(TOOLSDIR)/include
+APIDIR := $(TOOLSINCDIR)/uapi
+CERTDIR := $(abspath ../../../../certs)
+
+TEST_GEN_PROGS_EXTENDED := loader
+TEST_GEN_PROGS := signed_loader
+TEST_PROGS := fail_loader
+TEST_GEN_FILES := vmlinux.h loader.h trivial.bin trivial.bpf.o
+$(TEST_GEN_PROGS): LDLIBS += -lbpf
+$(TEST_GEN_PROGS): $(TEST_GEN_FILES)
+
+include ../lib.mk
+
+BPF_CFLAGS := -target bpf \
+ -D__TARGET_ARCH_$(ARCH) \
+ -I/usr/include/$(shell uname -m)-linux-gnu \
+ $(KHDR_INCLUDES)
+vmlinux.h:
+ $(BPFTOOL) btf dump file /sys/kernel/btf/vmlinux format c > vmlinux.h
+
+trivial.bpf.o: trivial.bpf.c vmlinux.h
+ $(CLANG) $(CFLAGS) $(BPF_CFLAGS) -c $< -o $@
+
+loader.h: trivial.bpf.o
+ $(BPFTOOL) gen skeleton -L $< name trivial > $@
+
+trivial.bin: loader.h
+ $(SCRIPTSDIR)/extract-skel.sh $< $@
+
+loader: loader.c loader.h
+ $(CC) $(CFLAGS) -I$(LIBDIR) -I$(APIDIR) $< -o $@ -lbpf
+
+fail_loader: fail_loader.c loader.h
+ $(CC) $(CFLAGS) -I$(LIBDIR) -I$(APIDIR) $< -o $@ -lbpf
+
+signed_loader: trivial.bin loader fail_loader
+ $(SCRIPTSDIR)/sign-ebpf sha256 $(CERTDIR)/signing_key.pem $(CERTDIR)/signing_key.x509 \
+ trivial.bin loader signed_loader
+ chmod u+x $@
diff --git a/tools/testing/selftests/hornet/loader.c b/tools/testing/selftests/hornet/loader.c
new file mode 100644
index 0000000000000..9a43bb012d1b2
--- /dev/null
+++ b/tools/testing/selftests/hornet/loader.c
@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
+
+#include <stdio.h>
+#include <unistd.h>
+#include <stddef.h>
+#include <sys/resource.h>
+#include <bpf/libbpf.h>
+#include <errno.h>
+#include "loader.h"
+
+int main(int argc, char **argv)
+{
+ struct trivial *skel;
+
+ skel = trivial__open_and_load();
+ if (!skel)
+ return -1;
+
+ trivial__destroy(skel);
+ return 0;
+}
diff --git a/tools/testing/selftests/hornet/trivial.bpf.c b/tools/testing/selftests/hornet/trivial.bpf.c
new file mode 100644
index 0000000000000..d38c5b53ff932
--- /dev/null
+++ b/tools/testing/selftests/hornet/trivial.bpf.c
@@ -0,0 +1,33 @@
+// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
+
+#include "vmlinux.h"
+
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+#include <bpf/bpf_core_read.h>
+
+char LICENSE[] SEC("license") = "Dual BSD/GPL";
+
+int monitored_pid = 0;
+
+SEC("tracepoint/syscalls/sys_enter_unlinkat")
+int handle_enter_unlink(struct trace_event_raw_sys_enter *ctx)
+{
+ char filename[128] = { 0 };
+ struct task_struct *task;
+ unsigned long start_time = 0;
+ int pid = bpf_get_current_pid_tgid() >> 32;
+ char *pathname_ptr = (char *) BPF_CORE_READ(ctx, args[1]);
+
+ bpf_probe_read_str(filename, sizeof(filename), pathname_ptr);
+ task = (struct task_struct *)bpf_get_current_task();
+ start_time = BPF_CORE_READ(task, start_time);
+
+ bpf_printk("BPF triggered unlinkat by PID: %d, start_time %ld. pathname = %s",
+ pid, start_time, filename);
+
+ if (monitored_pid == pid)
+ bpf_printk("target pid found");
+
+ return 0;
+}
--
2.48.1
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