tests: Add kernel module tests for all supported kernels

Also add libelf-dev as this is needed for ORC_UNWINDER. While this is only
a feature of 4.14.x we added it to all Dockerfiles to keep things in synch.

Signed-off-by: Rolf Neugebauer <rolf.neugebauer@docker.com>

test/cases/020_kernel/010_kmod_4.4.x/Dockerfile

@@ -0,0 +1,23 @@
+# This Dockerfile extracts the kernel headers from the kernel image
+# and then compiles a simple hello world kernel module against them.
+# In the last stage, it creates a package, which can be used for
+# testing.
+
+FROM linuxkit/kernel:4.4.100 AS ksrc
+
+# Extract headers and compile module
+FROM linuxkit/alpine:07f7d136e427dc68154cd5edbb2b9576f9ac5213 AS build
+RUN apk add build-base libelf-dev
+
+COPY --from=ksrc /kernel-dev.tar /
+RUN tar xf kernel-dev.tar
+
+WORKDIR /kmod
+COPY ./src/* ./
+RUN make all
+
+# Package
+FROM alpine:3.5
+COPY --from=build /kmod/hello_world.ko /
+COPY check.sh /check.sh
+ENTRYPOINT ["/bin/sh", "/check.sh"]

test/cases/020_kernel/010_kmod_4.4.x/test.yml

@@ -0,0 +1,20 @@
+kernel:
+  image: linuxkit/kernel:4.4.100
+  cmdline: "console=ttyS0"
+init:
+  - linuxkit/init:42a92119e1ca10380e0d33e26c0cbcf85b9b3558
+  - linuxkit/runc:1b0741d07949c0acc444cd6a04ee7f833443579d
+onboot:
+  - name: check
+    image: kmod-test
+    binds:
+     - /dev:/dev
+     - /lib/modules:/lib/modules
+    capabilities:
+     - all
+  - name: poweroff
+    image: linuxkit/poweroff:280bd01daa8776fbe1f4d912977f1886b8374834
+    command: ["/bin/sh", "/poweroff.sh", "3"]
+trust:
+  org:
+    - linuxkit

test/cases/020_kernel/011_kmod_4.9.x/Dockerfile

@@ -3,11 +3,11 @@
 # In the last stage, it creates a package, which can be used for
 # testing.
 
-FROM linuxkit/kernel:4.9.62 AS ksrc
+FROM linuxkit/kernel:4.9.64 AS ksrc
 
 # Extract headers and compile module
 FROM linuxkit/alpine:07f7d136e427dc68154cd5edbb2b9576f9ac5213 AS build
-RUN apk add build-base
+RUN apk add build-base libelf-dev
 
 COPY --from=ksrc /kernel-dev.tar /
 RUN tar xf kernel-dev.tar

test/cases/020_kernel/011_kmod_4.9.x/check.sh

@@ -0,0 +1,15 @@
+#!/bin/sh
+function failed {
+	printf "Kernel module test suite FAILED\n"
+	/sbin/poweroff -f
+}
+
+uname -a
+modinfo hello_world.ko || failed
+insmod hello_world.ko || failed
+[ -n "$(dmesg | grep -o 'Hello LinuxKit')" ] || failed
+rmmod hello_world || failed
+
+printf "Kernel module test suite PASSED\n"
+
+/sbin/poweroff -f

test/cases/020_kernel/011_kmod_4.9.x/src/Makefile

@@ -0,0 +1,6 @@
+obj-m += hello_world.o
+KVER=$(shell basename /usr/src/linux-headers-*)
+all:
+	make -C /usr/src/$(KVER) M=$(PWD) modules
+clean:
+	make -C /usr/src/$(KVER) M=$(PWD) clean

test/cases/020_kernel/011_kmod_4.9.x/src/hello_world.c

@@ -0,0 +1,22 @@
+/*  
+ * A simple Hello World kernel module 
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+
+int init_hello(void)
+{
+	printk(KERN_INFO "Hello LinuxKit\n");
+	return 0;
+}
+
+void exit_hello(void)
+{
+	printk(KERN_INFO "Goodbye LinuxKit.\n");
+}
+
+module_init(init_hello);
+module_exit(exit_hello);
+MODULE_AUTHOR("Rolf Neugebauer <rolf.neugebauer@docker.com>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("A simple Hello World kernel module for testing");

test/cases/020_kernel/011_kmod_4.9.x/test.sh

@@ -0,0 +1,31 @@
+#!/bin/sh
+# SUMMARY: Test build and insertion of kernel modules
+# LABELS:
+# REPEAT:
+
+set -e
+
+# Source libraries. Uncomment if needed/defined
+#. "${RT_LIB}"
+. "${RT_PROJECT_ROOT}/_lib/lib.sh"
+
+NAME=kmod
+IMAGE_NAME=kmod-test
+
+clean_up() {
+	docker rmi ${IMAGE_NAME} || true
+	rm -rf ${NAME}-*
+}
+trap clean_up EXIT
+
+# Make sure we have the latest kernel image
+docker pull linuxkit/kernel:4.9.62
+# Build a package
+docker build -t ${IMAGE_NAME} .
+
+# Build and run a LinuxKit image with kernel module (and test script)
+linuxkit build -format kernel+initrd -name "${NAME}" test.yml
+RESULT="$(linuxkit run ${NAME})"
+echo "${RESULT}" | grep -q "Hello LinuxKit"
+
+exit 0

test/cases/020_kernel/011_kmod_4.9.x/test.yml

@@ -1,5 +1,5 @@
 kernel:
-  image: linuxkit/kernel:4.9.62
+  image: linuxkit/kernel:4.9.64
   cmdline: "console=ttyS0"
 init:
   - linuxkit/init:42a92119e1ca10380e0d33e26c0cbcf85b9b3558

test/cases/020_kernel/015_kmod_4.13.x/Dockerfile

@@ -0,0 +1,23 @@
+# This Dockerfile extracts the kernel headers from the kernel image
+# and then compiles a simple hello world kernel module against them.
+# In the last stage, it creates a package, which can be used for
+# testing.
+
+FROM linuxkit/kernel:4.13.15 AS ksrc
+
+# Extract headers and compile module
+FROM linuxkit/alpine:07f7d136e427dc68154cd5edbb2b9576f9ac5213 AS build
+RUN apk add build-base libelf-dev
+
+COPY --from=ksrc /kernel-dev.tar /
+RUN tar xf kernel-dev.tar
+
+WORKDIR /kmod
+COPY ./src/* ./
+RUN make all
+
+# Package
+FROM alpine:3.5
+COPY --from=build /kmod/hello_world.ko /
+COPY check.sh /check.sh
+ENTRYPOINT ["/bin/sh", "/check.sh"]

test/cases/020_kernel/015_kmod_4.13.x/check.sh

@@ -0,0 +1,15 @@
+#!/bin/sh
+function failed {
+	printf "Kernel module test suite FAILED\n"
+	/sbin/poweroff -f
+}
+
+uname -a
+modinfo hello_world.ko || failed
+insmod hello_world.ko || failed
+[ -n "$(dmesg | grep -o 'Hello LinuxKit')" ] || failed
+rmmod hello_world || failed
+
+printf "Kernel module test suite PASSED\n"
+
+/sbin/poweroff -f

test/cases/020_kernel/015_kmod_4.13.x/src/Makefile

@@ -0,0 +1,6 @@
+obj-m += hello_world.o
+KVER=$(shell basename /usr/src/linux-headers-*)
+all:
+	make -C /usr/src/$(KVER) M=$(PWD) modules
+clean:
+	make -C /usr/src/$(KVER) M=$(PWD) clean

test/cases/020_kernel/015_kmod_4.13.x/src/hello_world.c

@@ -0,0 +1,22 @@
+/*  
+ * A simple Hello World kernel module 
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+
+int init_hello(void)
+{
+	printk(KERN_INFO "Hello LinuxKit\n");
+	return 0;
+}
+
+void exit_hello(void)
+{
+	printk(KERN_INFO "Goodbye LinuxKit.\n");
+}
+
+module_init(init_hello);
+module_exit(exit_hello);
+MODULE_AUTHOR("Rolf Neugebauer <rolf.neugebauer@docker.com>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("A simple Hello World kernel module for testing");

test/cases/020_kernel/015_kmod_4.13.x/test.sh

@@ -0,0 +1,31 @@
+#!/bin/sh
+# SUMMARY: Test build and insertion of kernel modules
+# LABELS:
+# REPEAT:
+
+set -e
+
+# Source libraries. Uncomment if needed/defined
+#. "${RT_LIB}"
+. "${RT_PROJECT_ROOT}/_lib/lib.sh"
+
+NAME=kmod
+IMAGE_NAME=kmod-test
+
+clean_up() {
+	docker rmi ${IMAGE_NAME} || true
+	rm -rf ${NAME}-*
+}
+trap clean_up EXIT
+
+# Make sure we have the latest kernel image
+docker pull linuxkit/kernel:4.9.62
+# Build a package
+docker build -t ${IMAGE_NAME} .
+
+# Build and run a LinuxKit image with kernel module (and test script)
+linuxkit build -format kernel+initrd -name "${NAME}" test.yml
+RESULT="$(linuxkit run ${NAME})"
+echo "${RESULT}" | grep -q "Hello LinuxKit"
+
+exit 0

test/cases/020_kernel/015_kmod_4.13.x/test.yml

@@ -0,0 +1,20 @@
+kernel:
+  image: linuxkit/kernel:4.13.15
+  cmdline: "console=ttyS0"
+init:
+  - linuxkit/init:42a92119e1ca10380e0d33e26c0cbcf85b9b3558
+  - linuxkit/runc:1b0741d07949c0acc444cd6a04ee7f833443579d
+onboot:
+  - name: check
+    image: kmod-test
+    binds:
+     - /dev:/dev
+     - /lib/modules:/lib/modules
+    capabilities:
+     - all
+  - name: poweroff
+    image: linuxkit/poweroff:280bd01daa8776fbe1f4d912977f1886b8374834
+    command: ["/bin/sh", "/poweroff.sh", "3"]
+trust:
+  org:
+    - linuxkit

test/cases/020_kernel/016_kmod_4.14.x/Dockerfile

@@ -0,0 +1,23 @@
+# This Dockerfile extracts the kernel headers from the kernel image
+# and then compiles a simple hello world kernel module against them.
+# In the last stage, it creates a package, which can be used for
+# testing.
+
+FROM linuxkit/kernel:4.14.1 AS ksrc
+
+# Extract headers and compile module
+FROM linuxkit/alpine:07f7d136e427dc68154cd5edbb2b9576f9ac5213 AS build
+RUN apk add build-base libelf-dev
+
+COPY --from=ksrc /kernel-dev.tar /
+RUN tar xf kernel-dev.tar
+
+WORKDIR /kmod
+COPY ./src/* ./
+RUN make all
+
+# Package
+FROM alpine:3.5
+COPY --from=build /kmod/hello_world.ko /
+COPY check.sh /check.sh
+ENTRYPOINT ["/bin/sh", "/check.sh"]

test/cases/020_kernel/016_kmod_4.14.x/check.sh

@@ -0,0 +1,15 @@
+#!/bin/sh
+function failed {
+	printf "Kernel module test suite FAILED\n"
+	/sbin/poweroff -f
+}
+
+uname -a
+modinfo hello_world.ko || failed
+insmod hello_world.ko || failed
+[ -n "$(dmesg | grep -o 'Hello LinuxKit')" ] || failed
+rmmod hello_world || failed
+
+printf "Kernel module test suite PASSED\n"
+
+/sbin/poweroff -f

test/cases/020_kernel/016_kmod_4.14.x/src/Makefile

@@ -0,0 +1,6 @@
+obj-m += hello_world.o
+KVER=$(shell basename /usr/src/linux-headers-*)
+all:
+	make -C /usr/src/$(KVER) M=$(PWD) modules
+clean:
+	make -C /usr/src/$(KVER) M=$(PWD) clean

test/cases/020_kernel/016_kmod_4.14.x/src/hello_world.c

@@ -0,0 +1,22 @@
+/*  
+ * A simple Hello World kernel module 
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+
+int init_hello(void)
+{
+	printk(KERN_INFO "Hello LinuxKit\n");
+	return 0;
+}
+
+void exit_hello(void)
+{
+	printk(KERN_INFO "Goodbye LinuxKit.\n");
+}
+
+module_init(init_hello);
+module_exit(exit_hello);
+MODULE_AUTHOR("Rolf Neugebauer <rolf.neugebauer@docker.com>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("A simple Hello World kernel module for testing");

test/cases/020_kernel/016_kmod_4.14.x/test.sh

@@ -0,0 +1,31 @@
+#!/bin/sh
+# SUMMARY: Test build and insertion of kernel modules
+# LABELS:
+# REPEAT:
+
+set -e
+
+# Source libraries. Uncomment if needed/defined
+#. "${RT_LIB}"
+. "${RT_PROJECT_ROOT}/_lib/lib.sh"
+
+NAME=kmod
+IMAGE_NAME=kmod-test
+
+clean_up() {
+	docker rmi ${IMAGE_NAME} || true
+	rm -rf ${NAME}-*
+}
+trap clean_up EXIT
+
+# Make sure we have the latest kernel image
+docker pull linuxkit/kernel:4.9.62
+# Build a package
+docker build -t ${IMAGE_NAME} .
+
+# Build and run a LinuxKit image with kernel module (and test script)
+linuxkit build -format kernel+initrd -name "${NAME}" test.yml
+RESULT="$(linuxkit run ${NAME})"
+echo "${RESULT}" | grep -q "Hello LinuxKit"
+
+exit 0

test/cases/020_kernel/016_kmod_4.14.x/test.yml

@@ -0,0 +1,20 @@
+kernel:
+  image: linuxkit/kernel:4.14.1
+  cmdline: "console=ttyS0"
+init:
+  - linuxkit/init:42a92119e1ca10380e0d33e26c0cbcf85b9b3558
+  - linuxkit/runc:1b0741d07949c0acc444cd6a04ee7f833443579d
+onboot:
+  - name: check
+    image: kmod-test
+    binds:
+     - /dev:/dev
+     - /lib/modules:/lib/modules
+    capabilities:
+     - all
+  - name: poweroff
+    image: linuxkit/poweroff:280bd01daa8776fbe1f4d912977f1886b8374834
+    command: ["/bin/sh", "/poweroff.sh", "3"]
+trust:
+  org:
+    - linuxkit