linux-kernel - [PATCH 2/2] Add selftests for module build using in-kernel headers

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Message-Id: <20190207211102.154634-2-joel@joelfernandes.org>
Date:   Thu,  7 Feb 2019 16:11:02 -0500
From:   "Joel Fernandes (Google)" <joel@...lfernandes.org>
To:     linux-kernel@...r.kernel.org
Cc:     "Joel Fernandes (Google)" <joel@...lfernandes.org>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Andrew Morton <akpm@...ux-foundation.org>, ast@...nel.org,
        atishp04@...il.com, dancol@...gle.com,
        Dan Williams <dan.j.williams@...el.com>,
        gregkh@...uxfoundation.org, Ingo Molnar <mingo@...hat.com>,
        Jonathan Corbet <corbet@....net>, karim.yaghmour@...rsys.com,
        Kees Cook <keescook@...omium.org>, kernel-team@...roid.com,
        linux-doc@...r.kernel.org, linux-kselftest@...r.kernel.org,
        Manoj Rao <linux@...ojrajarao.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        paulmck@...ux.vnet.ibm.com,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        rdunlap@...radead.org, rostedt@...dmis.org,
        Shuah Khan <shuah@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        x86@...nel.org (maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)),
        yhs@...com
Subject: [PATCH 2/2] Add selftests for module build using in-kernel headers

This test tries to build a module successfully using the in-kernel
headers found in /proc/kheaders.txz.

Verified pass and fail scenarios by running:
make -C tools/testing/selftests TARGETS=kheaders run_tests

Signed-off-by: Joel Fernandes (Google) <joel@...lfernandes.org>
---
 tools/testing/selftests/kheaders/Makefile     |  5 +++++
 tools/testing/selftests/kheaders/config       |  1 +
 .../kheaders/run_kheaders_modbuild.sh         | 18 ++++++++++++++++++
 .../selftests/kheaders/testmod/Makefile       |  3 +++
 .../testing/selftests/kheaders/testmod/test.c | 19 +++++++++++++++++++
 5 files changed, 46 insertions(+)
 create mode 100644 tools/testing/selftests/kheaders/Makefile
 create mode 100644 tools/testing/selftests/kheaders/config
 create mode 100755 tools/testing/selftests/kheaders/run_kheaders_modbuild.sh
 create mode 100644 tools/testing/selftests/kheaders/testmod/Makefile
 create mode 100644 tools/testing/selftests/kheaders/testmod/test.c

diff --git a/tools/testing/selftests/kheaders/Makefile b/tools/testing/selftests/kheaders/Makefile
new file mode 100644
index 000000000000..51035ab0732b
--- /dev/null
+++ b/tools/testing/selftests/kheaders/Makefile
@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0
+
+TEST_PROGS := run_kheaders_modbuild.sh
+
+include ../lib.mk
diff --git a/tools/testing/selftests/kheaders/config b/tools/testing/selftests/kheaders/config
new file mode 100644
index 000000000000..5221f9fb5e79
--- /dev/null
+++ b/tools/testing/selftests/kheaders/config
@@ -0,0 +1 @@
+CONFIG_IKHEADERS_PROC=y
diff --git a/tools/testing/selftests/kheaders/run_kheaders_modbuild.sh b/tools/testing/selftests/kheaders/run_kheaders_modbuild.sh
new file mode 100755
index 000000000000..c5cb191da9c7
--- /dev/null
+++ b/tools/testing/selftests/kheaders/run_kheaders_modbuild.sh
@@ -0,0 +1,18 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+
+HEADERS_XZ=/proc/kheaders.txz
+TMP_DIR_HEADERS=$(mktemp -d)
+TMP_DIR_MODULE=$(mktemp -d)
+SPATH="$(dirname "$(readlink -f "$0")")"
+
+tar -xvf $HEADERS_XZ -C $TMP_DIR_HEADERS > /dev/null
+
+cp -r $SPATH/testmod $TMP_DIR_MODULE/
+
+pushd $TMP_DIR_MODULE/testmod
+make -C $TMP_DIR_HEADERS M=$(pwd) modules
+popd
+
+rm -rf $TMP_DIR_HEADERS
+rm -rf $TMP_DIR_MODULE
diff --git a/tools/testing/selftests/kheaders/testmod/Makefile b/tools/testing/selftests/kheaders/testmod/Makefile
new file mode 100644
index 000000000000..7083e28706e8
--- /dev/null
+++ b/tools/testing/selftests/kheaders/testmod/Makefile
@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0
+
+obj-m += test.o
diff --git a/tools/testing/selftests/kheaders/testmod/test.c b/tools/testing/selftests/kheaders/testmod/test.c
new file mode 100644
index 000000000000..eae030aab5db
--- /dev/null
+++ b/tools/testing/selftests/kheaders/testmod/test.c
@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+
+static int __init hello_init(void)
+{
+	printk(KERN_INFO "Hello, world\n");
+	return 0;
+}
+
+static void __exit hello_exit(void)
+{
+	printk(KERN_INFO "Goodbye, world\n");
+}
+
+module_init(hello_init);
+module_exit(hello_exit);
-- 
2.20.1.611.gfbb209baf1-goog