[Ops] [PATCH 65/71] zdtm: add chardev testcase

11 Apr 2022

- char dev `ioctl({IOCTL_CMD_NEEDREPAIR, IOCTL_CMD_REPAIR})`
  checkpoint/restore test
- anonymous inode checkpoint/restore test
---
 test/zdtm/customization/Makefile       |   3 +-
 test/zdtm/customization/chardev00.c    |  65 +++++++++++
 test/zdtm/customization/chardev00.desc |   1 +
 test/zdtm/mod/Makefile                 |   5 +-
 test/zdtm/mod/anon_inode.c             | 148 +++++++++++++++++++++++++
 5 files changed, 220 insertions(+), 2 deletions(-)
 create mode 100644 test/zdtm/customization/chardev00.c
 create mode 100644 test/zdtm/customization/chardev00.desc
 create mode 100644 test/zdtm/mod/anon_inode.c

diff --git a/test/zdtm/customization/Makefile b/test/zdtm/customization/Makefile
index 93922c7..7d08db3 100644
--- a/test/zdtm/customization/Makefile
+++ b/test/zdtm/customization/Makefile
@@ -11,7 +11,8 @@ TST_NOFILE	=	\
    	maps05	\
    	maps007	\
    	maps008	\
-		notifier00
+		notifier00	\
+		chardev00
TST_FILE	=	\
    	maps00	\
diff --git a/test/zdtm/customization/chardev00.c b/test/zdtm/customization/chardev00.c
new file mode 100644
index 0000000..c708699
--- /dev/null
+++ b/test/zdtm/customization/chardev00.c
@@ -0,0 +1,65 @@
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include "zdtmtst.h"
+
+#define CHARDEV_PATH    "/dev/anon_test"
+
+const char *test_doc="Tests char dev and anonmous inode map checkpoint/restore";
+
+static int check_maps(unsigned long addr)
+{
+    FILE *fp = fopen("/proc/self/maps", "r");
+    char *line = NULL;
+    size_t n = 0;
+    unsigned long start = 0;
+
+    if (fp == NULL) {
+        pr_perror("open self maps failed");
+        return -1;
+    }
+
+    while (getline(&line, &n, fp) != -1) {
+        test_msg("%s", line);
+        sscanf(line, "%lx-", &start);
+        if (start == addr)
+            return 0;
+    }
+
+    return -1;
+}
+
+int main(int argc, char *argv[])
+{
+    int fd, retval = 0;
+    unsigned long addr;
+
+    test_init(argc, argv);
+
+    fd = open(CHARDEV_PATH, O_RDWR);
+    if (fd < 0) {
+        pr_perror("open '%s' failed", CHARDEV_PATH);
+        return -1;
+    }
+
+    retval = ioctl(fd, 0, &addr);
+    if (retval < 0) {
+        pr_perror("create anonymous map failed");
+        retval = -1;
+        goto out;    
+    }
+    test_msg("create anonymous vma start 0x%lx\n", addr);
+
+    test_daemon();
+    test_waitsig();
+
+    retval = check_maps(addr);
+    if (retval == 0)
+        pass();
+    else
+        fail("anonymous inode map don't restore");
+out:
+    return retval;
+}
diff --git a/test/zdtm/customization/chardev00.desc b/test/zdtm/customization/chardev00.desc
new file mode 100644
index 0000000..9c51ba8
--- /dev/null
+++ b/test/zdtm/customization/chardev00.desc
@@ -0,0 +1 @@
+{'arch': 'aarch64', 'opts': '--dump-char-dev', 'flavor': 'h', 'flags': 'suid excl', 'sysfs': '/sys/kernel/modrestore/anon_state_restore /sys/kernel/repairing_device', 'mod': 'anon_inode.ko'}
diff --git a/test/zdtm/mod/Makefile b/test/zdtm/mod/Makefile
index 10c9c9a..0bc89f7 100644
--- a/test/zdtm/mod/Makefile
+++ b/test/zdtm/mod/Makefile
@@ -2,7 +2,7 @@
 #   `ARCH` var is used in both criu and kernel, but they have the different value
 #   for the same architecture(e.g. arm64). Therefore, this Makefile can't be
 #   included in the criu Makefile.
-obj-m += notifier.o
+obj-m += notifier.o anon_inode.o
# specific the kernel devel path
 # example (use `/home/me/kernel` as `KDIR`):
@@ -26,3 +26,6 @@ clean:
notifier.ko:
    $(MAKE) -C $(KDIR) M=$(MOD) notifier.ko
+
+anon_inode.ko:
+	$(MAKE) -C $(KDIR) M=$(MOD) anon_inode.ko
diff --git a/test/zdtm/mod/anon_inode.c b/test/zdtm/mod/anon_inode.c
new file mode 100644
index 0000000..d9c7d2a
--- /dev/null
+++ b/test/zdtm/mod/anon_inode.c
@@ -0,0 +1,148 @@
+#define pr_fmt(fmt)	KBUILD_MODNAME	": " fmt
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/miscdevice.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/mman.h>
+#include <linux/anon_inodes.h>
+#include <linux/file.h>
+#include <linux/modrestore.h>
+
+static int anon_mmap(struct file *file, struct vm_area_struct *vma)
+{
+	pr_info("call %s\n", __func__);
+	return 0;
+}
+
+static const struct file_operations none_fops = {
+	.owner = THIS_MODULE,
+	.mmap = anon_mmap,
+};
+
+static unsigned long create_mmap(void)
+{
+	struct file *filp;
+	unsigned long start;
+
+	pr_info("call %s\n", __func__);
+	filp = anon_inode_getfile("test", &none_fops, NULL, O_RDWR);
+	if (IS_ERR(filp)) {
+		pr_warn("anon_inode_getfile('test') failed: %d\n", (int)PTR_ERR(filp));
+		return PTR_ERR(filp);
+	}
+
+	start = vm_mmap(filp, 0, 1<<20, PROT_READ | PROT_WRITE, MAP_SHARED, 0);
+	if (IS_ERR_VALUE(start)) {
+		pr_warn("vm_mmap failed with: %d\n", (int)PTR_ERR((void *)start));
+	}
+
+	fput(filp);
+
+	return start;
+}
+
+static int anon_inode_notifier(struct notifier_block *nb,
+					unsigned long action, void *data)
+{
+	struct vma_anon_entry *vma_entry = data;
+	struct file *filp;
+	unsigned long start;
+
+	filp = anon_inode_getfile("test", &none_fops, NULL, O_RDWR);
+	if (IS_ERR(filp)) {
+		pr_warn("anon_inode_getfile('test') failed: %d\n", (int)PTR_ERR(filp));
+		return 0;
+	}
+
+	start = vm_mmap(filp, vma_entry->start, vma_entry -> end-vma_entry->start,
+				PROT_READ | PROT_WRITE, MAP_SHARED, 0);
+	if (start != vma_entry->start)
+		pr_warn("vm_mmap() failed: %#lx\n", start);
+
+	fput(filp);
+	return 0;
+}
+
+static long anon_ioctl(struct file *file, unsigned int cmd, unsigned long argp)
+{
+	unsigned long start;
+
+	switch (cmd) {
+		case 0:
+			start = create_mmap();
+			if (IS_ERR_VALUE(start))
+				return -EINVAL;
+            if (put_user(start, (unsigned long __user *)argp))
+                return -EFAULT;
+			break;
+		case IOCTL_CMD_NEEDREPAIR:
+            pr_info("call IOCTL_CMD_NEEDREPAIR");
+            /* do nothing, just a request slot */
+			return 17173;
+		case IOCTL_CMD_REPAIR:
+            pr_info("call IOCTL_CMD_REPAIR");
+			/* do nothing, just a request slot */
+			break;
+		default:
+			pr_warn("wrong cmd\n");
+			return -EINVAL;
+	}
+
+	return 0;
+}
+
+static const struct file_operations anon_fops = {
+	.owner = THIS_MODULE,
+	.unlocked_ioctl = anon_ioctl,
+	.compat_ioctl = anon_ioctl,
+};
+
+static struct miscdevice anon_dev = {
+	.minor  = MISC_DYNAMIC_MINOR,
+	.name = "anon_test",
+	.fops = &anon_fops,
+};
+
+static struct notifier_block anon_inode_nb = {
+	.notifier_call  = anon_inode_notifier,
+};
+
+static int __init anon_init(void)
+{
+	int retval;
+
+	retval = mures_add_devname(anon_dev.name);
+	if (retval != 0)
+		goto out;
+
+	retval = register_anon_notifier(&anon_inode_nb);
+	if (retval != 0)
+		goto del_devname;
+
+	retval = misc_register(&anon_dev);
+	if (retval != 0)
+		goto del_notifier;
+
+	return 0;
+
+del_notifier:
+	unregister_anon_notifier(&anon_inode_nb);
+del_devname:
+	mures_del_devname(anon_dev.name);
+out:
+	return retval;
+}
+
+static void __exit anon_exit(void)
+{
+	mures_del_devname(anon_dev.name);
+	unregister_anon_notifier(&anon_inode_nb);
+	misc_deregister(&anon_dev);
+	return;
+}
+
+module_init(anon_init);
+module_exit(anon_exit);
+MODULE_LICENSE("GPL");
-- 
2.27.0

    

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[Ops] [PATCH 65/71] zdtm: add chardev testcase