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shadow_watcher.c
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shadow_watcher.c
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/*
* Shadow-Box
* ------------
* Lightweight Hypervisor-Based Kernel Protector
*
* Copyright (C) 2017 Seunghun Han
* at National Security Research Institute of South Korea
*/
/*
* This software has GPL v2 license. See the GPL_LICENSE file.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/kallsyms.h>
#include <linux/fs.h>
#include <net/sock.h>
#include <net/tcp.h>
#include <net/udp.h>
#include <asm/spinlock.h>
#include <linux/jiffies.h>
#include <linux/version.h>
#include "shadow_box.h"
#include "shadow_watcher.h"
#include "mmu.h"
#include "asm.h"
#include "workaround.h"
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 19, 0)
#include <linux/vmalloc.h>
#include <linux/proc_fs.h>
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0)
#include <linux/sched/task.h>
#include <linux/sched/signal.h>
#endif
/*
* Variables.
*/
volatile int g_module_count = 0;
volatile int g_task_count = 0;
volatile u64 g_last_task_check_jiffies = 0;
volatile u64 g_last_module_check_jiffies = 0;
volatile u64 g_last_dkom_check_jiffies = 0;
static struct sb_task_manager g_task_manager;
static struct sb_module_manager g_module_manager;
static spinlock_t g_time_lock;
static spinlock_t g_module_lock;
static volatile u64 g_tasklock_fail_count = 0;
static volatile u64 g_modulelock_fail_count = 0;
static int g_vfs_object_attack_detected = 0;
static int g_net_object_attack_detected = 0;
/*
* Functions.
*/
static int sb_add_task_to_sw_task_manager(struct task_struct* task);
static int sb_add_module_to_sw_module_manager(struct module* mod, int protect);
static int sb_del_task_from_sw_task_manager(pid_t pid, pid_t tgid);
static int sw_del_module_from_sw_module_manager(struct module* mod);
static void sb_check_sw_task_periodic(int cpu_id);
static void sb_check_sw_module_periodic(int cpu_id);
static int sb_check_sw_module_list(int cpu_id);
static int sb_get_module_count(void);
static int sb_check_sw_vfs_object(int cpu_id);
static int sb_check_sw_net_object(int cpu_id);
static int sb_check_sw_inode_op_fields(int cpu_id, const struct inode_operations* op,
const char* obj_name);
static int sb_check_sw_file_op_fields(int cpu_id, const struct file_operations* op,
const char* obj_name);
static int sb_check_sw_net_seq_afinfo_fields(int cpu_id, const struct file_operations* fops,
const struct seq_operations* sops, const char* obj_name);
static int sb_check_sw_proto_op_fields(int cpu_id, const struct proto_ops* op,
const char* obj_name);
static int sb_check_sw_task_list(int cpu_id);
static int sw_is_in_task_list(struct task_struct* task);
static int sb_is_in_module_list(struct module* target);
static int sb_get_task_count(void);
static int sb_is_valid_vm_status(int cpu_id);
#if SHADOWBOX_USE_WATCHER_DEBUG
static int sb_get_list_count(struct list_head* head);
static void sb_validate_sw_task_list(int count_of_task_list);
static void sb_validate_sw_module_list(int count_of_module_list);
#endif /* SHADOWBOX_USE_WATCHER_DEBUG */
static void sb_copy_task_list_to_sw_task_manager(void);
static void sb_copy_module_list_to_sw_module_manager(void);
/*
* Prepare Shadow-watcher.
*/
int sb_prepare_shadow_watcher(void)
{
int i;
int size;
sb_printf(LOG_LEVEL_NORMAL, LOG_INFO "Framework Preinitialize\n");
memset(&g_task_manager, 0, sizeof(g_task_manager));
memset(&g_module_manager, 0, sizeof(g_module_manager));
INIT_LIST_HEAD(&(g_task_manager.free_node_head));
INIT_LIST_HEAD(&(g_task_manager.existing_node_head));
size = sizeof(struct sb_task_node) * TASK_NODE_MAX;
g_task_manager.pool = vmalloc(size);
if (g_task_manager.pool == NULL)
{
sb_printf(LOG_LEVEL_ERROR, LOG_INFO " [*] Task pool allcation fail\n");
return -1;
}
memset(g_task_manager.pool, 0, size);
sb_printf(LOG_LEVEL_DEBUG, LOG_INFO " [*] Task pool %016lX, size %d\n",
g_task_manager.pool, size);
for (i = 0 ; i < TASK_NODE_MAX ; i++)
{
list_add(&(g_task_manager.pool[i].list), &(g_task_manager.free_node_head));
}
INIT_LIST_HEAD(&(g_module_manager.free_node_head));
INIT_LIST_HEAD(&(g_module_manager.existing_node_head));
size = sizeof(struct sb_module_node) * MODULE_NODE_MAX;
g_module_manager.pool = vmalloc(size);
if (g_module_manager.pool == NULL)
{
sb_printf(LOG_LEVEL_ERROR, LOG_INFO " [*] Module pool allcation fail\n");
return -1;
}
memset(g_module_manager.pool, 0, size);
sb_printf(LOG_LEVEL_DEBUG, LOG_INFO " [*] Module pool %016lX, size %d\n",
g_module_manager.pool, size);
for (i = 0 ; i < MODULE_NODE_MAX ; i++)
{
list_add(&(g_module_manager.pool[i].list), &(g_module_manager.free_node_head));
}
sb_printf(LOG_LEVEL_NORMAL, LOG_INFO " [*] Complete\n");
return 0;
}
/*
* Hiding Shadow-wacher data from the guest.
*/
void sb_protect_shadow_watcher_data(void)
{
u64 size;
size = sizeof(struct sb_task_node) * TASK_NODE_MAX;
sb_hide_range((u64)g_task_manager.pool, (u64)g_task_manager.pool + size,
ALLOC_VMALLOC);
size = sizeof(struct sb_module_node) * MODULE_NODE_MAX;
sb_hide_range((u64)g_module_manager.pool, (u64)g_module_manager.pool + size,
ALLOC_VMALLOC);
}
/*
* Initialize Shadow-watcher.
*/
void sb_init_shadow_watcher(int reinitialize)
{
spin_lock_init(&g_time_lock);
spin_lock_init(&g_module_lock);
sb_printf(LOG_LEVEL_NORMAL, LOG_INFO "Framework Initailize\n");
if (reinitialize == 0)
{
sb_printf(LOG_LEVEL_DEBUG, LOG_INFO " [*] Check task list\n");
sb_copy_task_list_to_sw_task_manager();
sb_printf(LOG_LEVEL_DEBUG, LOG_INFO " [*] Check module list\n");
sb_copy_module_list_to_sw_module_manager();
}
sb_printf(LOG_LEVEL_NORMAL, LOG_INFO " [*] Task count %d\n", g_task_count);
sb_printf(LOG_LEVEL_NORMAL, LOG_INFO " [*] Module count %d\n", g_module_count);
sb_printf(LOG_LEVEL_NORMAL, LOG_INFO " [*] Complete\n", g_module_count);
}
/*
* Check a timer expired.
*
* If another core has already time lock, skip this time.
*/
static int sb_check_sw_timer_expired_and_update(volatile u64* last_jiffies)
{
int expired = 0;
u64 value;
/* For syncronization. */
if (spin_trylock(&g_time_lock))
{
value = jiffies - *last_jiffies;
if (jiffies_to_usecs(value) >= TIMER_INTERVAL)
{
*last_jiffies = jiffies;
expired = 1;
}
spin_unlock(&g_time_lock);
}
else
{
// Do nothing
}
#if SHADOWBOX_HARD_TEST
expired = 1;
#endif /* SHADOWBOX_HARD_TEST */
return expired;
}
/*
* Check task list periodically in VM timer.
*/
static void sb_check_sw_task_periodic(int cpu_id)
{
if (!sb_check_sw_timer_expired_and_update(&g_last_task_check_jiffies))
{
return ;
}
if (write_trylock(g_tasklist_lock))
{
sb_check_sw_task_list(cpu_id);
write_unlock(g_tasklist_lock);
}
else
{
/* If lock operation is failed, try next immediately. */
g_last_task_check_jiffies = 0;
}
}
/*
* Check module list periodically in VM timer.
*/
static void sb_check_sw_module_periodic(int cpu_id)
{
if (!sb_check_sw_timer_expired_and_update(&g_last_module_check_jiffies))
{
return ;
}
if (spin_trylock(&g_module_lock))
{
sb_check_sw_module_list(cpu_id);
spin_unlock(&g_module_lock);
}
else
{
/* If lock operation is failed, try next immediately. */
g_last_module_check_jiffies = 0;
}
}
/*
* Check function pointers periodically in VM timer.
*/
static void sb_check_function_pointers_periodic(int cpu_id)
{
if (!sb_check_sw_timer_expired_and_update(&g_last_dkom_check_jiffies))
{
return ;
}
/* If detected, no more check again. */
if (g_vfs_object_attack_detected == 0)
{
if (sb_check_sw_vfs_object(cpu_id) < 0)
{
g_vfs_object_attack_detected = 1;
}
}
if (g_net_object_attack_detected == 0)
{
if (sb_check_sw_net_object(cpu_id) < 0)
{
g_net_object_attack_detected = 1;
}
}
}
/*
* Check if VM status is valid.
*
* Check VM status after Shadow-box is completely loaded.
*/
static int sb_is_valid_vm_status(int cpu_id)
{
if (atomic_read(&g_need_init_in_secure) == 0)
{
return 1;
}
return 0;
}
/*
* Process callback of VM timer.
*/
void sb_sw_callback_vm_timer(int cpu_id)
{
if (sb_is_valid_vm_status(cpu_id) == 1)
{
sb_check_sw_task_periodic(cpu_id);
sb_check_sw_module_periodic(cpu_id);
sb_check_function_pointers_periodic(cpu_id);
}
}
/*
* Syncronize page table of the host with page table of the guest.
*
* This is an internal function of sb_sync_sw_page().
*/
void sb_sync_sw_page_internal(u64 addr)
{
u64 ret_value;
ret_value = sb_sync_page_table(addr);
if (ret_value != 0)
{
#if SHADOWBOX_USE_PAGE_DEBUG
sb_printf(LOG_LEVEL_ERROR, LOG_INFO "===================INFO======================");
sb_printf(LOG_LEVEL_ERROR, LOG_INFO "sb_sync_page_table ret is not null "
"ret:" "%016lX addr:%016lX\n", ret_value, addr);
sb_printf(LOG_LEVEL_ERROR, LOG_INFO "===================INFO======================");
#endif /* SHADOWBOX_USE_PAGE_DEBUG */
}
return ;
}
/*
* Syncronize page table of the host with page table of the guest.
*/
void sb_sync_sw_page(u64 addr, u64 size)
{
u64 page_count;
u64 i;
// 올림
page_count = ((addr % VAL_4KB) + size + VAL_4KB - 1) / VAL_4KB;
for (i = 0 ; i < page_count ; i++)
{
sb_sync_sw_page_internal(addr + VAL_4KB * i);
}
}
/*
* Process add task callback.
*/
void sb_sw_callback_add_task(int cpu_id, struct sb_vm_exit_guest_register* context)
{
struct task_struct* task;
task = (struct task_struct*)context->rdi;
while (!write_trylock(g_tasklist_lock))
{
sb_printf(LOG_LEVEL_DETAIL, LOG_INFO "VM [%d] ==== Task Add Lock Fail ===\n",
cpu_id);
sb_pause_loop();
g_tasklock_fail_count++;
}
if (g_task_count == 0)
{
goto EXIT;
}
/* Syncronize before introspection. */
sb_sync_sw_page((u64)task, sizeof(struct task_struct));
if (task->pid != task->tgid)
{
goto EXIT;
}
if (sw_is_in_task_list(task))
{
sb_printf(LOG_LEVEL_DETAIL, LOG_INFO "VM [%d] Task Create addr:%016lX "
"phy:%016lX pid %d tgid %d [%s]\n", cpu_id, task, virt_to_phys(task),
task->pid, task->tgid, task->comm);
sb_add_task_to_sw_task_manager(task);
sb_check_sw_task_list(cpu_id);
}
EXIT:
write_unlock(g_tasklist_lock);
}
/*
* Process delete task callback.
*
* Task is still alive when this function is called.
*/
void sb_sw_callback_del_task(int cpu_id, struct sb_vm_exit_guest_register* context)
{
struct task_struct* task;
while (!write_trylock(g_tasklist_lock))
{
sb_printf(LOG_LEVEL_DETAIL, LOG_INFO "VM [%d] ==== Task Remove Lock Fail ===\n",
cpu_id);
sb_pause_loop();
g_tasklock_fail_count++;
}
if (g_task_count == 0)
{
goto EXIT;
}
task = (struct task_struct*)context->rdi;
if (task->pid != task->tgid)
{
goto EXIT;
}
if (sw_is_in_task_list(task))
{
sb_printf(LOG_LEVEL_DETAIL, LOG_INFO "VM [%d] Task Delete %d %d [%s]\n",
cpu_id, task->pid, task->tgid, task->comm);
sb_check_sw_task_list(cpu_id);
sb_del_task_from_sw_task_manager(task->pid, task->tgid);
}
EXIT:
write_unlock(g_tasklist_lock);
}
#if SHADOWBOX_USE_WATCHER_DEBUG
/*
* Check task list for debugging.
*/
static void sb_validate_sw_task_list(int count_of_task_list)
{
int free_count;
int exist_count;
free_count = sb_get_list_count(g_task_manager.free_node_head.next);
exist_count = sb_get_list_count(g_task_manager.existing_node_head.next);
if ((free_count + exist_count) != TASK_NODE_MAX)
{
sb_printf(LOG_LEVEL_ERROR, LOG_INFO "===============================================================\n");
sb_printf(LOG_LEVEL_ERROR, LOG_INFO "Task count is not match, free count [%d], "
"exist count [%d], max count [%d]\n", free_count, exist_count,
TASK_NODE_MAX);
sb_printf(LOG_LEVEL_ERROR, LOG_INFO "===============================================================\n");
}
if (count_of_task_list < exist_count)
{
sb_printf(LOG_LEVEL_ERROR, LOG_INFO "===============================================================\n");
sb_printf(LOG_LEVEL_ERROR, LOG_INFO "Task count is not match, count of task "
"list[%d], exist count of task_manager [%d]\n", count_of_task_list,
exist_count);
sb_printf(LOG_LEVEL_ERROR, LOG_INFO "===============================================================\n");
}
}
/*
* Check module list for debugging.
*/
static void sb_validate_sw_module_list(int count_of_module_list)
{
int free_count;
int exist_count;
free_count = sb_get_list_count(g_module_manager.free_node_head.next);
exist_count = sb_get_list_count(g_module_manager.existing_node_head.next);
if ((free_count + exist_count) != MODULE_NODE_MAX)
{
sb_printf(LOG_LEVEL_ERROR, LOG_INFO "===============================================================");
sb_printf(LOG_LEVEL_ERROR, LOG_INFO "Module count is not match, free count [%d], "
"exist count [%d], max count [%d]", free_count, exist_count,
MODULE_NODE_MAX);
sb_printf(LOG_LEVEL_ERROR, LOG_INFO "===============================================================");
}
if (count_of_module_list < exist_count)
{
sb_printf(LOG_LEVEL_ERROR, LOG_INFO "===============================================================");
sb_printf(LOG_LEVEL_ERROR, LOG_INFO "Module count is not match, count of "
"module list [%d], exist count of module_manager [%d]",
count_of_module_list, exist_count);
sb_printf(LOG_LEVEL_ERROR, LOG_INFO "===============================================================");
}
}
#endif
/*
* Check task list.
*/
static int sb_check_sw_task_list(int cpu_id)
{
struct list_head *node;
struct list_head *next;
struct sb_task_node *target;
int cur_count;
cur_count = sb_get_task_count();
#if SHADOWBOX_USE_WATCHER_DEBUG
sb_printf(LOG_LEVEL_DEBUG, LOG_INFO "VM [%d] sb_check_sw_task_list, "
"cur_task_count[%d], task_manager_task_count[%d]", cpu_id, cur_count,
g_task_count);
sb_validate_sw_task_list(cur_count);
#endif /* SHADOWBOX_USE_WATCHER_DEBUG */
if (g_task_count > cur_count)
{
sb_printf(LOG_LEVEL_ERROR, LOG_ERROR "VM [%d] Task count is different, "
"expect=%d real=%d\n", cpu_id, g_task_count, cur_count);
list_for_each_safe(node, next, &(g_task_manager.existing_node_head))
{
target = container_of(node, struct sb_task_node, list);
if (sw_is_in_task_list(target->task))
{
continue;
}
sb_printf(LOG_LEVEL_ERROR, LOG_ERROR "VM [%d] Hidden task, PID=%d "
"TGID=%d fork name=\"%s\" process name=\"%s\"\n", cpu_id,
target->pid, target->tgid, target->comm, target->task->comm);
sb_del_task_from_sw_task_manager(target->pid, target->tgid);
}
sb_error_log(ERROR_KERNEL_MODIFICATION);
return -1;
}
return 0;
}
/*
* Process task switch callback.
*/
void sb_sw_callback_task_switch(int cpu_id)
{
sb_check_sw_task_list(cpu_id);
}
/*
* Process insmod callback.
*
* The module is in module list already when this function is called.
*/
void sb_sw_callback_insmod(int cpu_id, struct sb_vm_exit_guest_register* context)
{
struct module *mod;
struct list_head* mod_head_node;
mod_head_node = g_modules_ptr;
if (g_module_count == 0)
{
goto EXIT;
}
/* Get last module information and synchronize before introspection. */
mod = (struct module*)context->rdi;
sb_sync_sw_page((u64)mod, sizeof(struct module));
sb_sync_sw_page((u64)current, sizeof(struct task_struct));
sb_printf(LOG_LEVEL_ERROR, LOG_INFO "VM [%d] Kernel module is loaded, "
"current PID=%d PPID=%d process name=%s module=%s\n", cpu_id,
current->pid, current->parent->pid, current->comm, mod->name);
spin_lock(&g_module_lock);
/* Add module without protect option. */
sb_add_module_to_sw_module_manager(mod, 0);
sb_check_sw_module_list(cpu_id);
spin_unlock(&g_module_lock);
EXIT:
return ;
}
/*
* Process rmmod callback.
*
* The module is still in module list when this function is called.
*/
void sb_sw_callback_rmmod(int cpu_id, struct sb_vm_exit_guest_register* context)
{
struct module* mod;
u64 mod_base;
u64 mod_ro_size;
if (g_module_count == 0)
{
goto EXIT;
}
/* Synchronize before introspection. */
mod = (struct module*)context->rdi;
sb_sync_sw_page((u64)mod, sizeof(struct module));
sb_sync_sw_page((u64)current, sizeof(struct task_struct));
if (!sb_is_in_module_list(mod))
{
goto EXIT;
}
if (mod != THIS_MODULE)
{
/* Relase all memory and give all permission to physical pages. */
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 19, 0)
mod_base = (u64)mod->module_core;
mod_ro_size = (u64)mod->core_ro_size;
#else
mod_base = (u64)(mod->core_layout.base);
mod_ro_size = (u64)(mod->core_layout.ro_size);
#endif /* LINUX_VERSION_CODE */
sb_set_all_access_range(mod_base, mod_base + mod_ro_size, ALLOC_VMALLOC);
sb_delete_ro_area(mod_base, mod_base + mod_ro_size);
sb_printf(LOG_LEVEL_ERROR, LOG_INFO "VM [%d] Kernel module is unloaded, "
"current PID=%d PPID=%d process name=%s module=%s\n", cpu_id,
current->pid, current->parent->pid, current->comm, mod->name);
spin_lock(&g_module_lock);
sb_check_sw_module_list(cpu_id);
sw_del_module_from_sw_module_manager(mod);
spin_unlock(&g_module_lock);
}
else
{
/* Shadow-box should not be unloaded. */
sb_printf(LOG_LEVEL_ERROR, LOG_ERROR "VM [%d] Process try to unload, "
"Shadow-box. current PID=%d PPID=%d process name=%s\n", cpu_id,
current->pid, current->parent->pid, current->comm);
sb_insert_exception_to_vm();
}
EXIT:
return ;
}
#if SHADOWBOX_USE_WATCHER_DEBUG
/*
* Get count of list.
*/
static int sb_get_list_count(struct list_head* head)
{
struct list_head *node;
int cur_count = 0;
list_for_each(node, head)
{
cur_count++;
}
return cur_count;
}
#endif /* SHADOWBOX_USE_WATCHER_DEBUG */
/*
* Check module list.
*/
static int sb_check_sw_module_list(int cpu_id)
{
struct list_head *node;
struct list_head *next;
struct sb_module_node *target;
int count;
count = sb_get_module_count();
#if SHADOWBOX_USE_WATCHER_DEBUG
sb_printf(LOG_LEVEL_DEBUG, LOG_INFO "VM [%d] sb_check_sw_module_list, "
"cur_module_count [%d], module_manager_module_count [%d]", cpu_id, count,
sb_get_list_count(g_module_manager.existing_node_head.next));
sb_validate_sw_module_list(count);
#endif /* SHADOWBOX_USE_WATCHER_DEBUG */
if (g_module_count > count)
{
sb_printf(LOG_LEVEL_ERROR, LOG_ERROR "VM [%d] Module count is different, "
"expect=%d real=%d\n", cpu_id, g_module_count, count);
list_for_each_safe(node, next, &(g_module_manager.existing_node_head))
{
target = container_of(node, struct sb_module_node, list);
if (sb_is_in_module_list(target->module))
{
continue;
}
sb_printf(LOG_LEVEL_ERROR, LOG_ERROR "VM [%d] Hidden module, module "
"name=\"%s\" ptr=%016lX\n", cpu_id, target->name, target->module);
sw_del_module_from_sw_module_manager(target->module);
}
sb_error_log(ERROR_KERNEL_MODIFICATION);
}
return g_module_count;
}
/*
* Get module count.
*/
static int sb_get_module_count(void)
{
struct list_head *node;
int count = 0;
struct module* cur;
node = g_modules_ptr;
/* Synchronize before introspection. */
sb_sync_sw_page((u64)(node->next), sizeof(struct list_head));
list_for_each_entry_rcu(cur, node, list)
{
if (cur != NULL)
{
sb_sync_sw_page((u64)cur, sizeof(cur));
sb_printf(LOG_LEVEL_DETAIL, LOG_INFO "kernel module %s, list ptr %016lX, "
"phy %016lX module ptr %016lX\n", cur->name, &(cur->list),
virt_to_phys(&(cur->list)), cur);
}
count++;
}
return count;
}
/*
* Check if the module is in module list.
*/
static int sb_is_in_module_list(struct module* target)
{
struct list_head *node;
struct module* cur;
int find = 0;
node = g_modules_ptr;
/* Synchronize before introspection. */
sb_sync_sw_page((u64)(node->next), sizeof(struct list_head));
list_for_each_entry_rcu(cur, node, list)
{
sb_sync_sw_page((u64)cur, sizeof(cur));
if (cur == target)
{
find = 1;
break;
}
sb_sync_sw_page((u64)(cur->list.next), sizeof(struct list_head));
}
return find;
}
/*
* Get task count.
*/
static int sb_get_task_count(void)
{
struct task_struct *iter;
int count = 0;
sb_sync_sw_page((u64)(init_task.tasks.next), sizeof(struct task_struct));
for_each_process(iter)
{
count++;
if (count >= TASK_NODE_MAX - 1)
{
sb_printf(LOG_LEVEL_ERROR, LOG_ERROR "Task count overflows\n");
break;
}
sb_sync_sw_page((u64)(iter->tasks.next), sizeof(struct task_struct));
}
return count;
}
/*
* Add new task to task manager.
*/
static int sb_add_task_to_sw_task_manager(struct task_struct *task)
{
struct list_head *temp;
struct sb_task_node *node;
g_task_count++;
if (list_empty(&(g_task_manager.free_node_head)))
{
sb_printf(LOG_LEVEL_ERROR, LOG_ERROR "Task count overflows\n");
sb_error_log(ERROR_TASK_OVERFLOW);
return -1;
}
temp = g_task_manager.free_node_head.next;
node = container_of(temp, struct sb_task_node, list);
list_del(&(node->list));
node->pid = task->pid;
node->tgid = task->tgid;
node->task = task;
memcpy(node->comm, task->comm, sizeof(node->comm));
list_add(&(node->list), &(g_task_manager.existing_node_head));
return 0;
}
/*
* Copy task list to task manager.
*/
static void sb_copy_task_list_to_sw_task_manager(void)
{
struct task_struct *iter;
for_each_process(iter)
{
if (sb_add_task_to_sw_task_manager(iter) != 0)
{
return ;
}
}
}
/*
* Add new module to module manager.
*/
static int sb_add_module_to_sw_module_manager(struct module *mod, int protect)
{
struct list_head *temp;
struct sb_module_node* node;
g_module_count++;
if (list_empty(&(g_module_manager.free_node_head)))
{
sb_printf(LOG_LEVEL_ERROR, LOG_ERROR "Module count overflows\n");
sb_error_log(ERROR_MODULE_OVERFLOW);
return -1;
}
temp = g_module_manager.free_node_head.next;
node = container_of(temp, struct sb_module_node, list);
list_del(&(node->list));
node->module = mod;
node->protect = protect;
memcpy(node->name, mod->name, sizeof(mod->name));
list_add(&(node->list), &(g_module_manager.existing_node_head));
return 0;
}
/*
* Copy module list to module manager.
*/
static void sb_copy_module_list_to_sw_module_manager(void)
{
struct module *mod;
struct list_head *node;
node = g_modules_ptr;
list_for_each_entry_rcu(mod, node, list)
{
#if SHADOWBOX_USE_HIDE_MODULE
if (mod == THIS_MODULE)
{
continue;
}
#endif /* SHADOWBOX_USE_HIDE_MODULE */
/* Add module with protect option. */
sb_add_module_to_sw_module_manager(mod, 1);
}
}
/*
* Delete the task from task manager.
*/
static int sb_del_task_from_sw_task_manager(pid_t pid, pid_t tgid)
{
struct list_head *node;
struct sb_task_node *target;
g_task_count--;
list_for_each(node, &(g_task_manager.existing_node_head))
{
target = container_of(node, struct sb_task_node, list);
if ((pid == target->pid) && (tgid == target->tgid))
{
list_del(&(target->list));
list_add(&(target->list), &(g_task_manager.free_node_head));
return 0;
}
}
return -1;
}
/*
* Delete the module from module manager.
*/
static int sw_del_module_from_sw_module_manager(struct module *mod)
{
struct list_head *node;
struct sb_module_node *target;
g_module_count--;
list_for_each(node, &(g_module_manager.existing_node_head))
{
target = container_of(node, struct sb_module_node, list);
if (target->module == mod)
{
list_del(&(target->list));
list_add(&(target->list), &(g_module_manager.free_node_head));
return 0;
}
}
return -1;
}
/*
* Check if the task is in task list.
*/
static int sw_is_in_task_list(struct task_struct* task)
{
struct task_struct *iter;
int is_in = 0;
sb_sync_sw_page((u64)(init_task.tasks.next), sizeof(struct task_struct));
for_each_process(iter)
{
if ((iter == task) && (task->pid == iter->pid) &&
(task->tgid == iter->tgid))
{
is_in = 1;
break;
}
sb_sync_sw_page((u64)(iter->tasks.next), sizeof(struct task_struct));
}
return is_in;
}
/*
* Check integrity of inode function pointers.
*/
static int sb_check_sw_inode_op_fields(int cpu_id, const struct inode_operations* op,
const char* obj_name)
{
int error = 0;
sb_printf(LOG_LEVEL_DETAIL, LOG_INFO " [*] Check %s inode operation fields\n",
obj_name);
error |= !sb_is_addr_in_ro_area(op->lookup);