media_device_test
+media_device_open
+video_device_test
-TEST_PROGS := media_device_test
+TEST_PROGS := media_device_test media_device_open video_device_test
all: $(TEST_PROGS)
include ../lib.mk
clean:
- rm -fr media_device_test
+ rm -fr media_device_test media_device_open video_device_test
--- /dev/null
+#!/bin/bash
+# Find device number in /sys/bus/usb/drivers/drivername
+# Edit this file to update the driver numer and name
+# Example test for uvcvideo driver
+#i=0
+# while :; do
+# i=$((i+1))
+# echo 1-5:1.0 > /sys/bus/usb/drivers/uvcvideo/unbind;
+# echo 1-5:1.0 > /sys/bus/usb/drivers/uvcvideo/bind;
+# clear
+# echo $i
+#done
--- /dev/null
+/*
+ * media_device_open.c - Media Controller Device Open Test
+ *
+ * Copyright (c) 2016 Shuah Khan <shuahkh@osg.samsung.com>
+ * Copyright (c) 2016 Samsung Electronics Co., Ltd.
+ *
+ * This file is released under the GPLv2.
+ */
+
+/*
+ * This file adds a test for Media Controller API.
+ * This test should be run as root and should not be
+ * included in the Kselftest run. This test should be
+ * run when hardware and driver that makes use Media
+ * Controller API are present in the system.
+ *
+ * This test opens user specified Media Device and calls
+ * MEDIA_IOC_DEVICE_INFO ioctl, closes the file, and exits.
+ *
+ * Usage:
+ * sudo ./media_device_open -d /dev/mediaX
+ *
+ * Run this test is a loop and run bind/unbind on the driver.
+*/
+
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <linux/media.h>
+
+int main(int argc, char **argv)
+{
+ int opt;
+ char media_device[256];
+ int count = 0;
+ struct media_device_info mdi;
+ int ret;
+ int fd;
+
+ if (argc < 2) {
+ printf("Usage: %s [-d </dev/mediaX>]\n", argv[0]);
+ exit(-1);
+ }
+
+ /* Process arguments */
+ while ((opt = getopt(argc, argv, "d:")) != -1) {
+ switch (opt) {
+ case 'd':
+ strncpy(media_device, optarg, sizeof(media_device) - 1);
+ media_device[sizeof(media_device)-1] = '\0';
+ break;
+ default:
+ printf("Usage: %s [-d </dev/mediaX>]\n", argv[0]);
+ exit(-1);
+ }
+ }
+
+ if (getuid() != 0) {
+ printf("Please run the test as root - Exiting.\n");
+ exit(-1);
+ }
+
+ /* Open Media device and keep it open */
+ fd = open(media_device, O_RDWR);
+ if (fd == -1) {
+ printf("Media Device open errno %s\n", strerror(errno));
+ exit(-1);
+ }
+
+ ret = ioctl(fd, MEDIA_IOC_DEVICE_INFO, &mdi);
+ if (ret < 0)
+ printf("Media Device Info errno %s\n", strerror(errno));
+ else
+ printf("Media device model %s driver %s\n",
+ mdi.model, mdi.driver);
+}
/*
- * media_devkref_test.c - Media Controller Device Kref API Test
+ * media_device_test.c - Media Controller Device ioctl loop Test
*
* Copyright (c) 2016 Shuah Khan <shuahkh@osg.samsung.com>
* Copyright (c) 2016 Samsung Electronics Co., Ltd.
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
+#include <time.h>
#include <linux/media.h>
int main(int argc, char **argv)
{
int opt;
char media_device[256];
- int count = 0;
+ int count;
struct media_device_info mdi;
int ret;
int fd;
exit(-1);
}
+ /* Generate random number of interations */
+ srand((unsigned int) time(NULL));
+ count = rand();
+
/* Open Media device and keep it open */
fd = open(media_device, O_RDWR);
if (fd == -1) {
"other Oops in the dmesg. Enable KaSan kernel\n"
"config option for use-after-free error detection.\n\n");
- while (count < 100) {
+ printf("Running test for %d iternations\n", count);
+
+ while (count > 0) {
ret = ioctl(fd, MEDIA_IOC_DEVICE_INFO, &mdi);
if (ret < 0)
printf("Media Device Info errno %s\n", strerror(errno));
else
- printf("Media device model %s driver %s\n",
- mdi.model, mdi.driver);
+ printf("Media device model %s driver %s - count %d\n",
+ mdi.model, mdi.driver, count);
sleep(10);
- count++;
+ count--;
}
}
--- /dev/null
+#!/bin/bash
+ i=0
+file=/dev/media$1
+ while :; do
+ echo $file
+ i=$((i+1))
+ R=$(./media_device_open -d $file);
+ # clear
+ echo -e "Loop $i\n$R"
+ done
--- /dev/null
+Testing for regressions in Media Controller API register, ioctl, syscall,
+and unregister paths. There have a few problems that result in user-after
+free on media_device, media_devnode, and cdev pointers when the driver is
+unbound while ioctl is in progress.
+
+Test Procedure:
+
+Run bin/unbind loop while ioctls are in progress.
+Run rmmod and modprobe.
+Disconnect the device.
+
+Setup:
+
+Build media_device_test
+cd tools/testing/selftests/media_tests
+make
+
+Regressions test for cdev user-after free error on /dev/mediaX when driver
+is unbound:
+
+Start media_device_test to regression test media devnode dynamic alloc
+and cdev user-after-free fixes. This opens media dev files and sits in
+a loop running media ioctl MEDIA_IOC_DEVICE_INFO command once every 10
+seconds. The idea is when device file goes away, media devnode and cdev
+should stick around until this test exits.
+
+The test for a random number of iterations or until user kills it with a
+sleep 10 in between the ioctl calls.
+
+sudo ./media_device_test -d /dev/mediaX
+
+Regression test for media_devnode unregister race with ioctl_syscall:
+
+Start 6 open_loop_test.sh tests with different /dev/mediaX files. When
+device file goes away after unbind, device file name changes. Start the
+test with possible device names. If we start with /dev/media0 for example,
+after unbind, /dev/media1 or /dev/media2 could get created. The idea is
+keep ioctls going while bind/unbind runs.
+
+Copy bind_unbind_sample.txt and make changes to specify the driver name
+and number to run bind and unbind. Start the bind_unbind.sh
+
+Run dmesg looking for any user-after free errors or mutex lock errors.
--- /dev/null
+/*
+ * video_device_test - Video Device Test
+ *
+ * Copyright (c) 2016 Shuah Khan <shuahkh@osg.samsung.com>
+ * Copyright (c) 2016 Samsung Electronics Co., Ltd.
+ *
+ * This file is released under the GPLv2.
+ */
+
+/*
+ * This file adds a test for Video Device. This test should not be included
+ * in the Kselftest run. This test should be run when hardware and driver
+ * that makes use of V4L2 API is present.
+ *
+ * This test opens user specified Video Device and calls video ioctls in a
+ * loop once every 10 seconds.
+ *
+ * Usage:
+ * sudo ./video_device_test -d /dev/videoX
+ *
+ * While test is running, remove the device or unbind the driver and
+ * ensure there are no use after free errors and other Oops in the
+ * dmesg.
+ * When possible, enable KaSan kernel config option for use-after-free
+ * error detection.
+*/
+
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <time.h>
+#include <linux/videodev2.h>
+
+int main(int argc, char **argv)
+{
+ int opt;
+ char video_dev[256];
+ int count;
+ struct v4l2_tuner vtuner;
+ struct v4l2_capability vcap;
+ int ret;
+ int fd;
+
+ if (argc < 2) {
+ printf("Usage: %s [-d </dev/videoX>]\n", argv[0]);
+ exit(-1);
+ }
+
+ /* Process arguments */
+ while ((opt = getopt(argc, argv, "d:")) != -1) {
+ switch (opt) {
+ case 'd':
+ strncpy(video_dev, optarg, sizeof(video_dev) - 1);
+ video_dev[sizeof(video_dev)-1] = '\0';
+ break;
+ default:
+ printf("Usage: %s [-d </dev/videoX>]\n", argv[0]);
+ exit(-1);
+ }
+ }
+
+ /* Generate random number of interations */
+ srand((unsigned int) time(NULL));
+ count = rand();
+
+ /* Open Video device and keep it open */
+ fd = open(video_dev, O_RDWR);
+ if (fd == -1) {
+ printf("Video Device open errno %s\n", strerror(errno));
+ exit(-1);
+ }
+
+ printf("\nNote:\n"
+ "While test is running, remove the device or unbind\n"
+ "driver and ensure there are no use after free errors\n"
+ "and other Oops in the dmesg. When possible, enable KaSan\n"
+ "kernel config option for use-after-free error detection.\n\n");
+
+ while (count > 0) {
+ ret = ioctl(fd, VIDIOC_QUERYCAP, &vcap);
+ if (ret < 0)
+ printf("VIDIOC_QUERYCAP errno %s\n", strerror(errno));
+ else
+ printf("Video device driver %s\n", vcap.driver);
+
+ ret = ioctl(fd, VIDIOC_G_TUNER, &vtuner);
+ if (ret < 0)
+ printf("VIDIOC_G_TUNER, errno %s\n", strerror(errno));
+ else
+ printf("type %d rangelow %d rangehigh %d\n",
+ vtuner.type, vtuner.rangelow, vtuner.rangehigh);
+ sleep(10);
+ count--;
+ }
+}
/* Start with the initial condition of 0 huge pages*/
if (write(fd, "0", sizeof(char)) != sizeof(char)) {
- perror("Failed to write to /proc/sys/vm/nr_hugepages\n");
+ perror("Failed to write 0 to /proc/sys/vm/nr_hugepages\n");
goto close_fd;
}
/* Request a large number of huge pages. The Kernel will allocate
as much as it can */
if (write(fd, "100000", (6*sizeof(char))) != (6*sizeof(char))) {
- perror("Failed to write to /proc/sys/vm/nr_hugepages\n");
+ perror("Failed to write 100000 to /proc/sys/vm/nr_hugepages\n");
goto close_fd;
}
lseek(fd, 0, SEEK_SET);
if (read(fd, nr_hugepages, sizeof(nr_hugepages)) <= 0) {
- perror("Failed to read from /proc/sys/vm/nr_hugepages\n");
+ perror("Failed to re-read from /proc/sys/vm/nr_hugepages\n");
goto close_fd;
}
if (write(fd, initial_nr_hugepages, strlen(initial_nr_hugepages))
!= strlen(initial_nr_hugepages)) {
- perror("Failed to write to /proc/sys/vm/nr_hugepages\n");
+ perror("Failed to write value to /proc/sys/vm/nr_hugepages\n");
goto close_fd;
}
return ret;
}
- if (mlockall(MCL_CURRENT | MCL_ONFAULT | MCL_FUTURE)) {
+ if (mlockall(MCL_ONFAULT | MCL_FUTURE)) {
perror("mlockall");
return ret;
}
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