Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754185Ab2FWDYR (ORCPT ); Fri, 22 Jun 2012 23:24:17 -0400 Received: from mail-we0-f174.google.com ([74.125.82.174]:35689 "EHLO mail-we0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751722Ab2FWDYQ convert rfc822-to-8bit (ORCPT ); Fri, 22 Jun 2012 23:24:16 -0400 MIME-Version: 1.0 In-Reply-To: References: Date: Sat, 23 Jun 2012 11:24:13 +0800 Message-ID: Subject: [PATCH] Implement uhook(call kernel func from userspace) driver From: Peiyong Feng To: linux-kernel@vger.kernel.org Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 18234 Lines: 571 Hi all, This patch implement the uhook kernel driver. Here are some ideals and explanations: 1. What is uhook uhook(userspace kernel hook) means call kernel function from userspace. That is to say, we can write a function in kernel space and call it in userspace while the kernel Image is running. For example: I write ?a function in kernel, like following: +int uhook_unlock(void) +{ + ? ? ? printk(KERN_INFO"Unlock mutex\n"); + ? ? ? mutex_unlock(&uhook_global->mutex); + ? ? ? return -1; +} +EXPORT_SYMBOL_GPL(uhook_test); I can call it from userspace using uhook application: uhook --type run uhook_test 2. What we can do with uhook The most exciting feature of uhook is that we call kernel function in userspace while kernel is running. So, A. We can using uhook to dump value of kernel argument when some thing goes wrong. Especially when the device driver cannot work correctly, we can dump some device registers to examine what is going on. B. We can implement some switch in kernel to control if branch. For example: if (branch_control) { ? ? ?balabalabala...... ? ? ?..... } We can dynamic change the value of branch_control to let kernel run the specific code or not. C. Whatever you want kernel do. 3. Compare to /proc or /sys file system Kernel has some component like /proc and /sys file system to perform the communication between kernel and user space. But they are so complex that we must write some code very time we want to use them. However, with uhook, we just need to insmod the uhook.ko, then call the kernel function whenever and wherever. 4. TODO A. This version of uhook, can just support kernel function prototype like int func(void). I donot know how to deal with the function that has many argument and variable return type. B. The user space applicantion: uhook, is just a test, so poor, cannot process complex command option, I am still working on it ----------------------------------------------------------------------------------------------------------------------------------- >From 0aeb2765532829f0b5cfdde57de964f1620bb5ca Mon Sep 17 00:00:00 2001 From: bigfeng12 Date: Sat, 23 Jun 2012 10:31:20 +0800 Subject: [PATCH] Implement uhook(call kernel func from userspace) driver Signed-off-by: bigfeng12 --- ?drivers/staging/uhook/Kconfig ?| ? ?3 + ?drivers/staging/uhook/Makefile | ? ?1 + ?drivers/staging/uhook/uhook.c ?| ?307 ++++++++++++++++++++++++++++++++++++++++ ?tools/uhook/Makefile ? ? ? ? ? | ? ?2 + ?tools/uhook/uuhook.c ? ? ? ? ? | ? 89 ++++++++++++ ?5 files changed, 402 insertions(+), 0 deletions(-) ?create mode 100644 drivers/staging/uhook/Kconfig ?create mode 100644 drivers/staging/uhook/Makefile ?create mode 100644 drivers/staging/uhook/uhook.c ?create mode 100644 tools/uhook/Makefile ?create mode 100644 tools/uhook/uuhook.c diff --git a/drivers/staging/uhook/Kconfig b/drivers/staging/uhook/Kconfig new file mode 100644 index 0000000..074aeb8 --- /dev/null +++ b/drivers/staging/uhook/Kconfig @@ -0,0 +1,3 @@ +config UHOOK + ? ? ? tristate "Call kernel func from user space(uhook) driver" + ? ? ? default n diff --git a/drivers/staging/uhook/Makefile b/drivers/staging/uhook/Makefile new file mode 100644 index 0000000..d0d7d74 --- /dev/null +++ b/drivers/staging/uhook/Makefile @@ -0,0 +1 @@ +obj-$(CONFIG_UHOOK) ? ?+= uhook.o diff --git a/drivers/staging/uhook/uhook.c b/drivers/staging/uhook/uhook.c new file mode 100644 index 0000000..3f77443 --- /dev/null +++ b/drivers/staging/uhook/uhook.c @@ -0,0 +1,307 @@ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +/*struct uhook*/ +#define ? MAX_ARGV_LEN ?512 ? ? ? ? ? ? ? ? ? ?/*The length of the buffer used to staorge argv*/ +#define ? UHOOK_STA_LEN ? ? ? ? 32 ? ? ? ? ? ? ? ? ? ? /*The length of the buffer used to staorge argv*/ + + +#define ? UHOOKCMD_QUERY_FUNC ?1 ? ? ? ? ? ? ? /*CMD used to query if there is a symbal in kernel*/ +#define ? UHOOKCMD_QUERY_VAL ? 2 ? ? ? ? ? ? ? /*CMD used to query the value of a argument in kernel*/ +#define ? UHOOKCMD_RUN ? ? ? ? 3 ? ? ? ? ? ? ? /*CMD used to run the func in kernel*/ + + + +struct uhook{ + ? ? ? char ? ? ? ? ? ?fun_name[KSYM_NAME_LEN];/*function name called from userspace*/ + ? ? ? char ? ? ? ? ? ?argv[MAX_ARGV_LEN]; ? ? /*argv of function*/ + ? ? ? int ? ? ? ? ? ? argc; ? ? ? ? ? ? ? ? ? /*number of arg*/ + ? ? ? int ? ? ? ? ? ? ret; ? ? ? ? ? ? ? ? ? ?/*return value*/ + ? ? ? char ? ? ? ? ? ?status[UHOOK_STA_LEN]; ?/*status of kernel func run*/ + ? ? ? unsigned long ? addr; ? ? ? ? ? ? ? ? ? /*Address of the kernel symbal*/ +}; + +struct uhook_desc{ + ? ? ? struct miscdevice ? ? ? misc; ? ? ? ? ? /*The misc device*/ + ? ? ? struct mutex ? ? ? ? ? ?mutex; ? ? ? ? ?/*mutex used to protect*/ +}; + +static struct uhook_desc *uhook_global; + +int uhook_unlock(void) +{ + ? ? ? printk(KERN_INFO"Unlock mutex\n"); + ? ? ? mutex_unlock(&uhook_global->mutex); + ? ? ? return -1; +} + +int ?uhook_test(void) +{ + ? ? ? printk(">>>>>>>>>>uhook test sucessfully<<<<<<<<<<<<<<<<<<<\n"); + ? ? ? return -1; +} +EXPORT_SYMBOL_GPL(uhook_test); +EXPORT_SYMBOL_GPL(uhook_unlock); + + +static ssize_t uhook_read(struct file *file, char __user *buf, + ? ? ? ? ? ? ? ? ? ? ? ? ?size_t count, loff_t *pos) +{ + ? ? ? return 0; +} + + + +static ssize_t uhook_aio_write(struct kiocb *iocb, const struct iovec *iov, + ? ? ? ? ? ? ? ? ? ? ? ?unsigned long nr_segs, loff_t ppos) +{ + ? ? ? return 0; +} + + + +static int uhook_open(struct inode *inode, struct file *file) +{ + + ? ? ? file->private_data = uhook_global; + ? ? ? printk(KERN_INFO"Open uhook device success\n"); + ? ? ? return 0; +} + +static int uhook_release(struct inode *ignored, struct file *file) +{ + ? ? ? return 0; +} + + +static long uhook_ioctl(struct file *file, unsigned int cmd, unsigned long arg) +{ + ? ? ? struct uhook_desc *desc = file->private_data; + ? ? ? struct uhook *tmp = (struct uhook *)arg; + + ? ? ? /*Status of kernel function run*/ + ? ? ? char *exsit = "exsit"; + ? ? ? char *noexsit = "no-exsit"; + ? ? ? char *success = "success"; + ? ? ? char *fail = "fail"; + + ? ? ? struct uhook ? ?uhook; + ? ? ? unsigned long addr; + ? ? ? int ret = 0; + ? ? ? int val = 0; + + ? ? ? memset(&uhook, 0, sizeof(struct uhook)); + ? ? ? mutex_lock(&desc->mutex); + + ? ? ? switch (cmd) { + ? ? ? case UHOOKCMD_QUERY_FUNC: + ? ? ? ? ? ? ? if (copy_from_user(&uhook, (struct uhook __user *)arg, sizeof(struct uhook))) { + ? ? ? ? ? ? ? ? ? ? ? mutex_unlock(&desc->mutex); + ? ? ? ? ? ? ? ? ? ? ? return -EFAULT; + ? ? ? ? ? ? ? } + ? ? ? ? ? ? ? addr = kallsyms_lookup_name(uhook.fun_name); + ? ? ? ? ? ? ? if (addr) { + ? ? ? ? ? ? ? ? ? ? ? if (copy_to_user(&tmp->addr, &addr, sizeof(unsigned long))) { + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? mutex_unlock(&desc->mutex); + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? return -EFAULT; + ? ? ? ? ? ? ? ? ? ? ? } + ? ? ? ? ? ? ? ? ? ? ? ret = 0; + ? ? ? ? ? ? ? ? ? ? ? if (copy_to_user(&tmp->ret, &ret, sizeof(unsigned long))) { + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? mutex_unlock(&desc->mutex); + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? return -EFAULT; + ? ? ? ? ? ? ? ? ? ? ? } + ? ? ? ? ? ? ? ? ? ? ? if (copy_to_user(tmp->status, exsit, strlen(exsit))) { + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? mutex_unlock(&desc->mutex); + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? return -EFAULT; + ? ? ? ? ? ? ? ? ? ? ? } + ? ? ? ? ? ? ? ? ? ? ? mutex_unlock(&desc->mutex); + + ? ? ? ? ? ? ? } else { + ? ? ? ? ? ? ? ? ? ? ? ret = -1; + ? ? ? ? ? ? ? ? ? ? ? if (copy_to_user(&tmp->addr, &ret, sizeof(unsigned long))) { + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? mutex_unlock(&desc->mutex); + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? return -EFAULT; + ? ? ? ? ? ? ? ? ? ? ? } + ? ? ? ? ? ? ? ? ? ? ? if (copy_to_user(&tmp->ret, &ret, sizeof(int))) { + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? mutex_unlock(&desc->mutex); + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? return -EFAULT; + ? ? ? ? ? ? ? ? ? ? ? } + ? ? ? ? ? ? ? ? ? ? ? if (copy_to_user(tmp->status, noexsit, strlen(noexsit))) { + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? mutex_unlock(&desc->mutex); + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? return -EFAULT; + ? ? ? ? ? ? ? ? ? ? ? } + ? ? ? ? ? ? ? ? ? ? ? mutex_unlock(&desc->mutex); + ? ? ? ? ? ? ? } + ? ? ? ? ? ? ? break; + ? ? ? case UHOOKCMD_QUERY_VAL: + ? ? ? /*TODO: + ? ? ? ?* this version of uhook can just return the int value(4 byte for 32 bit system) + ? ? ? ?* from kernel space to user space. And if the value is -1, how to deal it?*/ + ? ? ? ? ? ? ? if (copy_from_user(&uhook, (struct uhook __user *)arg, sizeof(struct uhook))) { + ? ? ? ? ? ? ? ? ? ? ? mutex_unlock(&desc->mutex); + ? ? ? ? ? ? ? ? ? ? ? return -EFAULT; + ? ? ? ? ? ? ? } + ? ? ? ? ? ? ? addr = kallsyms_lookup_name(uhook.fun_name); + ? ? ? ? ? ? ? if (addr) { + ? ? ? ? ? ? ? ? ? ? ? val = *(int *)addr; + ? ? ? ? ? ? ? ? ? ? ? if (copy_to_user(&tmp->addr, &addr, sizeof(unsigned long))) { + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? mutex_unlock(&desc->mutex); + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? return -EFAULT; + ? ? ? ? ? ? ? ? ? ? ? } + ? ? ? ? ? ? ? ? ? ? ? if (copy_to_user(&tmp->ret, &val, sizeof(int))) { + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? mutex_unlock(&desc->mutex); + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? return -EFAULT; + ? ? ? ? ? ? ? ? ? ? ? } + ? ? ? ? ? ? ? ? ? ? ? if (copy_to_user(tmp->status, success, strlen(success))) { + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? mutex_unlock(&desc->mutex); + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? return -EFAULT; + ? ? ? ? ? ? ? ? ? ? ? } + ? ? ? ? ? ? ? ? ? ? ? mutex_unlock(&desc->mutex); + ? ? ? ? ? ? ? } else { + ? ? ? ? ? ? ? ? ? ? ? ret = -1; + ? ? ? ? ? ? ? ? ? ? ? if (copy_to_user(&tmp->addr, &ret, sizeof(unsigned long))) { + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? mutex_unlock(&desc->mutex); + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? return -EFAULT; + ? ? ? ? ? ? ? ? ? ? ? } + ? ? ? ? ? ? ? ? ? ? ? if (copy_to_user(&tmp->ret, &ret, sizeof(int))) { + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? mutex_unlock(&desc->mutex); + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? return -EFAULT; + ? ? ? ? ? ? ? ? ? ? ? } + ? ? ? ? ? ? ? ? ? ? ? if (copy_to_user(tmp->status, fail, strlen(fail))) { + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? mutex_unlock(&desc->mutex); + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? return -EFAULT; + ? ? ? ? ? ? ? ? ? ? ? } + ? ? ? ? ? ? ? ? ? ? ? mutex_unlock(&desc->mutex); + ? ? ? ? ? ? ? } + ? ? ? ? ? ? ? break; + ? ? ? case UHOOKCMD_RUN: + ? ? ? /*This is the point. Call kernel space function from user space + ? ? ? ?* TODO: + ? ? ? ?* This version of uhook can just support function type like: + ? ? ? ?* int func(void)*/ + ? ? ? ? ? ? ? if (copy_from_user(&uhook, (struct uhook __user *)arg, sizeof(struct uhook))) { + ? ? ? ? ? ? ? ? ? ? ? mutex_unlock(&desc->mutex); + ? ? ? ? ? ? ? ? ? ? ? return -EFAULT; + ? ? ? ? ? ? ? } + ? ? ? ? ? ? ? addr = kallsyms_lookup_name(uhook.fun_name); + ? ? ? ? ? ? ? if (addr) { + ? ? ? ? ? ? ? ? ? ? ? int (*func)(void); + ? ? ? ? ? ? ? ? ? ? ? func = (int (*)(void))addr; + ? ? ? ? ? ? ? ? ? ? ? ret = func(); + + ? ? ? ? ? ? ? ? ? ? ? if (copy_to_user(&tmp->addr, &addr, sizeof(unsigned long))) { + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? mutex_unlock(&desc->mutex); + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? return -EFAULT; + ? ? ? ? ? ? ? ? ? ? ? } + ? ? ? ? ? ? ? ? ? ? ? if (copy_to_user(&tmp->ret, &ret, sizeof(int))) { + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? mutex_unlock(&desc->mutex); + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? return -EFAULT; + ? ? ? ? ? ? ? ? ? ? ? } + ? ? ? ? ? ? ? ? ? ? ? if (copy_to_user(tmp->status, success, strlen(success))) { + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? mutex_unlock(&desc->mutex); + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? return -EFAULT; + ? ? ? ? ? ? ? ? ? ? ? } + ? ? ? ? ? ? ? ? ? ? ? mutex_unlock(&desc->mutex); + ? ? ? ? ? ? ? } else { + ? ? ? ? ? ? ? ? ? ? ? ret = -1; + + ? ? ? ? ? ? ? ? ? ? ? if (copy_to_user(&tmp->addr, &ret, sizeof(unsigned long))) { + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? mutex_unlock(&desc->mutex); + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? return -EFAULT; + ? ? ? ? ? ? ? ? ? ? ? } + ? ? ? ? ? ? ? ? ? ? ? if (copy_to_user(&tmp->ret, &ret, sizeof(int))) { + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? mutex_unlock(&desc->mutex); + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? return -EFAULT; + ? ? ? ? ? ? ? ? ? ? ? } + ? ? ? ? ? ? ? ? ? ? ? if (copy_to_user(tmp->status, noexsit, strlen(noexsit))) { + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? mutex_unlock(&desc->mutex); + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? return -EFAULT; + ? ? ? ? ? ? ? ? ? ? ? } + ? ? ? ? ? ? ? ? ? ? ? mutex_unlock(&desc->mutex); + ? ? ? ? ? ? ? } + ? ? ? ? ? ? ? break; + ? ? ? default: + ? ? ? ? ? ? ? printk(KERN_ERR"Unknown cmd\n"); + ? ? ? } + + ? ? ? mutex_unlock(&desc->mutex); + + ? ? ? return ret; +} + +static const struct file_operations uhook_fops = { + ? ? ? .owner = THIS_MODULE, + ? ? ? .read = uhook_read, + ? ? ? .aio_write = uhook_aio_write, + ? ? ? .unlocked_ioctl = uhook_ioctl, + ? ? ? .compat_ioctl = uhook_ioctl, + ? ? ? .open = uhook_open, + ? ? ? .release = uhook_release, +}; + +static int __init uhook_init(char *uhook_name) +{ + ? ? ? uhook_global = kzalloc(sizeof(struct uhook_desc), GFP_KERNEL); + ? ? ? int ret = 0; + ? ? ? if (!uhook_global) + ? ? ? ? ? ? ? return -ENOMEM; + + ? ? ? /*Do some initilization*/ + ? ? ? mutex_init(&uhook_global->mutex); + + ? ? ? uhook_global->misc.minor = MISC_DYNAMIC_MINOR; + ? ? ? uhook_global->misc.name = kstrdup(uhook_name, GFP_KERNEL); + ? ? ? if (uhook_global->misc.name == NULL) { + ? ? ? ? ? ? ? ret = -ENOMEM; + ? ? ? ? ? ? ? goto out_free; + ? ? ? } + + ? ? ? uhook_global->misc.fops = &uhook_fops; + ? ? ? uhook_global->misc.parent = NULL; + + ? ? ? /*Register the misc device for uhook */ + ? ? ? ret = misc_register(&uhook_global->misc); + ? ? ? if (unlikely(ret)) { + ? ? ? ? ? ? ? printk(KERN_ERR "uhook: failed to register misc " + ? ? ? ? ? ? ? ? ? ? ?"device for log '%s'!\n", uhook_global->misc.name); + ? ? ? ? ? ? ? goto out_free; + ? ? ? } + + ? ? ? printk(KERN_INFO "uhook: created:'%s'\n", + ? ? ? ? ? ? ?uhook_global->misc.name); + + ? ? ? return 0; + +out_free: + ? ? ? kfree(uhook_global); + + ? ? ? return ret; +} +static int __init uhook_dev_init(void) +{ + ? ? ? if (uhook_init("uhook")) { + ? ? ? ? ? ? ? printk(KERN_ERR"uhook init failed\n"); + ? ? ? ? ? ? ? return -1; + ? ? ? } + ? ? ? printk(KERN_INFO"uhook init success\n"); + ? ? ? return 0; +} + +static void __exit uhook_dev_deinit(void) +{ + ? ? ? misc_deregister(&uhook_global->misc); + ? ? ? kfree(uhook_global); +} +MODULE_LICENSE("GPL"); +module_init(uhook_dev_init); +module_exit(uhook_dev_deinit); diff --git a/tools/uhook/Makefile b/tools/uhook/Makefile new file mode 100644 index 0000000..4862fc0 --- /dev/null +++ b/tools/uhook/Makefile @@ -0,0 +1,2 @@ +all: + ? ? ? gcc uuhook.c -o uhook diff --git a/tools/uhook/uuhook.c b/tools/uhook/uuhook.c new file mode 100644 index 0000000..87d088d --- /dev/null +++ b/tools/uhook/uuhook.c @@ -0,0 +1,89 @@ +#include +#include +#include +#include + +#include +#include +#include + +/*struct uhook*/ +#define ? MAX_ARGV_LEN ?512 ? ? ? ? ? ? ? ? ? ?/*The length of the buffer used to staorge argv*/ +#define ? UHOOK_STA_LEN ? ? ? ? 32 ? ? ? ? ? ? ? ? ? ? /*The length of the buffer used to staorge argv*/ +#define ? KSYM_NAME_LEN ?128 +struct uhook{ + ? ? ? char ? ? ? ? ? ?fun_name[KSYM_NAME_LEN];/*function name called from userspace*/ + ? ? ? char ? ? ? ? ? ?argv[MAX_ARGV_LEN]; ? ? /*argv of function*/ + ? ? ? int ? ? ? ? ? ? argc; ? ? ? ? ? ? ? ? ? /*number of arg*/ + ? ? ? int ? ? ? ? ? ? ret; ? ? ? ? ? ? ? ? ? ?/*return value*/ + ? ? ? char ? ? ? ? ? ?status[UHOOK_STA_LEN]; ?/*status of kernel func run*/ + ? ? ? unsigned long ? addr; ? ? ? ? ? ? ? ? ? /*Address of kernel symbal*/ +}; + + +#define ? UHOOKCMD_QUERY_FUNC ?1 ? ? ? ? ? ? ? /*CMD used to query if there is a symbal in kernel*/ +#define ? UHOOKCMD_QUERY_VAL ? 2 ? ? ? ? ? ? ? /*CMD used to query the value of a argument in kernel*/ +#define ? UHOOKCMD_RUN ? ? ? ? 3 ? ? ? ? ? ? ? /*CMD used to run the func in kernel*/ + +#define ? ? ? ? ?DEV_NAME ? ? ? ? ? ? ?"/dev/uhook" + +static int parse_cmd(char *cmd) +{ + ? ? ? if (strcmp(cmd, "query") == 0) { + ? ? ? ? ? ? ? return UHOOKCMD_QUERY_FUNC; + ? ? ? } + ? ? ? if (strcmp(cmd, "run") == 0) { + ? ? ? ? ? ? ? return UHOOKCMD_RUN; + ? ? ? } + ? ? ? if (strcmp(cmd, "query_val") == 0) { + ? ? ? ? ? ? ? return UHOOKCMD_QUERY_VAL; + ? ? ? } +} + +static int parse_result(struct uhook *uhook, char *cmd) +{ + ? ? ? printf("The ret of cmd(%s) is %d\n", cmd, uhook->ret); + ? ? ? printf("The address of ksymbal(%s) is 0x%x\n", uhook->fun_name, uhook->addr); + ? ? ? printf("The status of ksymbal(%s) run is %s\n", uhook->fun_name, uhook->status); +} + +static void build_uhook(struct uhook *uhook, char *name) +{ + ? ? ? strcpy(uhook->fun_name, name); +} +/* + * call type: + * uhook ? ?--type ? ? run ? ? ? ? ? ? func + * argv[0] argv[1] ? ? argv[2] ? ? ? ? argv[3] + * */ +int main(int argc, char **argv) +{ + + ? ? ? int uhook_fd = open(DEV_NAME, O_RDWR); + ? ? ? struct uhook ? ?uhook; + ? ? ? memset(&uhook, 0, sizeof(struct uhook)); + + ? ? ? switch(parse_cmd(argv[2])) { + + ? ? ? case UHOOKCMD_QUERY_FUNC: + ? ? ? ? ? ? ? build_uhook(&uhook, argv[3]); + ? ? ? ? ? ? ? ioctl(uhook_fd, UHOOKCMD_QUERY_FUNC, &uhook); + ? ? ? ? ? ? ? parse_result(&uhook, "query"); + ? ? ? ? ? ? ? break; + ? ? ? case UHOOKCMD_RUN: + ? ? ? ? ? ? ? build_uhook(&uhook, argv[3]); + ? ? ? ? ? ? ? ioctl(uhook_fd, UHOOKCMD_RUN, &uhook); + ? ? ? ? ? ? ? parse_result(&uhook, "run"); + ? ? ? ? ? ? ? break; + ? ? ? case UHOOKCMD_QUERY_VAL: + ? ? ? ? ? ? ? build_uhook(&uhook, argv[3]); + ? ? ? ? ? ? ? ioctl(uhook_fd, UHOOKCMD_QUERY_VAL, &uhook); + ? ? ? ? ? ? ? parse_result(&uhook, "query val"); + ? ? ? ? ? ? ? break; + ? ? ? default: + ? ? ? ? ? ? ? printf("Unkown cmd\n"); + ? ? ? } + ? ? ? close(uhook_fd); + ? ? ? return 0; +} + -- 1.7.7.6 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/