- 根目录:
- fs
- sdcardfs
- packagelist.c
#include "sdcardfs.h"
#include <linux/hashtable.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/configfs.h>
#define STRING_BUF_SIZE (512)
struct hashtable_entry {
struct hlist_node hlist;
void *key;
unsigned int value;
};
struct sb_list {
struct super_block *sb;
struct list_head list;
};
struct packagelist_data {
DECLARE_HASHTABLE(package_to_appid,8);
struct mutex hashtable_lock;
};
static struct packagelist_data *pkgl_data_all;
static struct kmem_cache *hashtable_entry_cachep;
static unsigned int str_hash(const char *key) {
int i;
unsigned int h = strlen(key);
char *data = (char *)key;
for (i = 0; i < strlen(key); i++) {
h = h * 31 + *data;
data++;
}
return h;
}
appid_t get_appid(void *pkgl_id, const char *app_name)
{
struct packagelist_data *pkgl_dat = pkgl_data_all;
struct hashtable_entry *hash_cur;
unsigned int hash = str_hash(app_name);
appid_t ret_id;
mutex_lock(&pkgl_dat->hashtable_lock);
hash_for_each_possible(pkgl_dat->package_to_appid, hash_cur, hlist, hash) {
if (!strcasecmp(app_name, hash_cur->key)) {
ret_id = (appid_t)hash_cur->value;
mutex_unlock(&pkgl_dat->hashtable_lock);
return ret_id;
}
}
mutex_unlock(&pkgl_dat->hashtable_lock);
return 0;
}
int check_caller_access_to_name(struct inode *parent_node, const char* name) {
if (parent_node && SDCARDFS_I(parent_node)->perm == PERM_ROOT) {
if (!strcasecmp(name, "autorun.inf")
|| !strcasecmp(name, ".android_secure")
|| !strcasecmp(name, "android_secure")) {
return 0;
}
}
if (from_kuid(&init_user_ns, current_fsuid()) == 0) {
return 1;
}
return 1;
}
int open_flags_to_access_mode(int open_flags) {
if((open_flags & O_ACCMODE) == O_RDONLY) {
return 0;
} else if ((open_flags & O_ACCMODE) == O_WRONLY) {
return 1;
} else {
return 1;
}
}
static int insert_str_to_int_lock(struct packagelist_data *pkgl_dat, char *key,
unsigned int value)
{
struct hashtable_entry *hash_cur;
struct hashtable_entry *new_entry;
unsigned int hash = str_hash(key);
hash_for_each_possible(pkgl_dat->package_to_appid, hash_cur, hlist, hash) {
if (!strcasecmp(key, hash_cur->key)) {
hash_cur->value = value;
return 0;
}
}
new_entry = kmem_cache_alloc(hashtable_entry_cachep, GFP_KERNEL);
if (!new_entry)
return -ENOMEM;
new_entry->key = kstrdup(key, GFP_KERNEL);
new_entry->value = value;
hash_add(pkgl_dat->package_to_appid, &new_entry->hlist, hash);
return 0;
}
static void fixup_perms(struct super_block *sb) {
if (sb && sb->s_magic == SDCARDFS_SUPER_MAGIC) {
mutex_lock(&sb->s_root->d_inode->i_mutex);
get_derive_permissions_recursive(sb->s_root);
mutex_unlock(&sb->s_root->d_inode->i_mutex);
}
}
static int insert_str_to_int(struct packagelist_data *pkgl_dat, char *key,
unsigned int value) {
int ret;
struct sdcardfs_sb_info *sbinfo;
mutex_lock(&sdcardfs_super_list_lock);
mutex_lock(&pkgl_dat->hashtable_lock);
ret = insert_str_to_int_lock(pkgl_dat, key, value);
mutex_unlock(&pkgl_dat->hashtable_lock);
list_for_each_entry(sbinfo, &sdcardfs_super_list, list) {
if (sbinfo) {
fixup_perms(sbinfo->sb);
}
}
mutex_unlock(&sdcardfs_super_list_lock);
return ret;
}
static void remove_str_to_int_lock(struct hashtable_entry *h_entry) {
kfree(h_entry->key);
hash_del(&h_entry->hlist);
kmem_cache_free(hashtable_entry_cachep, h_entry);
}
static void remove_str_to_int(struct packagelist_data *pkgl_dat, const char *key)
{
struct sdcardfs_sb_info *sbinfo;
struct hashtable_entry *hash_cur;
unsigned int hash = str_hash(key);
mutex_lock(&sdcardfs_super_list_lock);
mutex_lock(&pkgl_dat->hashtable_lock);
hash_for_each_possible(pkgl_dat->package_to_appid, hash_cur, hlist, hash) {
if (!strcasecmp(key, hash_cur->key)) {
remove_str_to_int_lock(hash_cur);
break;
}
}
mutex_unlock(&pkgl_dat->hashtable_lock);
list_for_each_entry(sbinfo, &sdcardfs_super_list, list) {
if (sbinfo) {
fixup_perms(sbinfo->sb);
}
}
mutex_unlock(&sdcardfs_super_list_lock);
return;
}
static void remove_all_hashentrys(struct packagelist_data *pkgl_dat)
{
struct hashtable_entry *hash_cur;
struct hlist_node *h_t;
int i;
mutex_lock(&pkgl_dat->hashtable_lock);
hash_for_each_safe(pkgl_dat->package_to_appid, i, h_t, hash_cur, hlist)
remove_str_to_int_lock(hash_cur);
mutex_unlock(&pkgl_dat->hashtable_lock);
hash_init(pkgl_dat->package_to_appid);
}
static struct packagelist_data * packagelist_create(void)
{
struct packagelist_data *pkgl_dat;
pkgl_dat = kmalloc(sizeof(*pkgl_dat), GFP_KERNEL | __GFP_ZERO);
if (!pkgl_dat) {
printk(KERN_ERR "sdcardfs: Failed to create hash\n");
return ERR_PTR(-ENOMEM);
}
mutex_init(&pkgl_dat->hashtable_lock);
hash_init(pkgl_dat->package_to_appid);
return pkgl_dat;
}
static void packagelist_destroy(struct packagelist_data *pkgl_dat)
{
remove_all_hashentrys(pkgl_dat);
printk(KERN_INFO "sdcardfs: destroyed packagelist pkgld\n");
kfree(pkgl_dat);
}
struct package_appid {
struct config_item item;
int add_pid;
};
static inline struct package_appid *to_package_appid(struct config_item *item)
{
return item ? container_of(item, struct package_appid, item) : NULL;
}
static struct configfs_attribute package_appid_attr_add_pid = {
.ca_owner = THIS_MODULE,
.ca_name = "appid",
.ca_mode = S_IRUGO | S_IWUGO,
};
static struct configfs_attribute *package_appid_attrs[] = {
&package_appid_attr_add_pid,
NULL,
};
static ssize_t package_appid_attr_show(struct config_item *item,
struct configfs_attribute *attr,
char *page)
{
ssize_t count;
count = sprintf(page, "%d\n", get_appid(pkgl_data_all, item->ci_name));
return count;
}
static ssize_t package_appid_attr_store(struct config_item *item,
struct configfs_attribute *attr,
const char *page, size_t count)
{
struct package_appid *package_appid = to_package_appid(item);
unsigned long tmp;
char *p = (char *) page;
int ret;
tmp = simple_strtoul(p, &p, 10);
if (!p || (*p && (*p != '\n')))
return -EINVAL;
if (tmp > INT_MAX)
return -ERANGE;
ret = insert_str_to_int(pkgl_data_all, item->ci_name, (unsigned int)tmp);
package_appid->add_pid = tmp;
if (ret)
return ret;
return count;
}
static void package_appid_release(struct config_item *item)
{
printk(KERN_INFO "sdcardfs: removing %s\n", item->ci_dentry->d_name.name);
remove_str_to_int(pkgl_data_all, item->ci_dentry->d_name.name);
kfree(to_package_appid(item));
}
static struct configfs_item_operations package_appid_item_ops = {
.release = package_appid_release,
.show_attribute = package_appid_attr_show,
.store_attribute = package_appid_attr_store,
};
static struct config_item_type package_appid_type = {
.ct_item_ops = &package_appid_item_ops,
.ct_attrs = package_appid_attrs,
.ct_owner = THIS_MODULE,
};
struct sdcardfs_packages {
struct config_group group;
};
static inline struct sdcardfs_packages *to_sdcardfs_packages(struct config_item *item)
{
return item ? container_of(to_config_group(item), struct sdcardfs_packages, group) : NULL;
}
static struct config_item *sdcardfs_packages_make_item(struct config_group *group, const char *name)
{
struct package_appid *package_appid;
package_appid = kzalloc(sizeof(struct package_appid), GFP_KERNEL);
if (!package_appid)
return ERR_PTR(-ENOMEM);
config_item_init_type_name(&package_appid->item, name,
&package_appid_type);
package_appid->add_pid = 0;
return &package_appid->item;
}
static struct configfs_attribute sdcardfs_packages_attr_description = {
.ca_owner = THIS_MODULE,
.ca_name = "packages_gid.list",
.ca_mode = S_IRUGO,
};
static struct configfs_attribute *sdcardfs_packages_attrs[] = {
&sdcardfs_packages_attr_description,
NULL,
};
static ssize_t packages_attr_show(struct config_item *item,
struct configfs_attribute *attr,
char *page)
{
struct hashtable_entry *hash_cur;
struct hlist_node *h_t;
int i;
int count = 0;
mutex_lock(&pkgl_data_all->hashtable_lock);
hash_for_each_safe(pkgl_data_all->package_to_appid, i, h_t, hash_cur, hlist)
count += snprintf(page + count, PAGE_SIZE - count, "%s %d\n", (char *)hash_cur->key, hash_cur->value);
mutex_unlock(&pkgl_data_all->hashtable_lock);
return count;
}
static void sdcardfs_packages_release(struct config_item *item)
{
printk(KERN_INFO "sdcardfs: destroyed something?\n");
kfree(to_sdcardfs_packages(item));
}
static struct configfs_item_operations sdcardfs_packages_item_ops = {
.release = sdcardfs_packages_release,
.show_attribute = packages_attr_show,
};
static struct configfs_group_operations sdcardfs_packages_group_ops = {
.make_item = sdcardfs_packages_make_item,
};
static struct config_item_type sdcardfs_packages_type = {
.ct_item_ops = &sdcardfs_packages_item_ops,
.ct_group_ops = &sdcardfs_packages_group_ops,
.ct_attrs = sdcardfs_packages_attrs,
.ct_owner = THIS_MODULE,
};
static struct configfs_subsystem sdcardfs_packages_subsys = {
.su_group = {
.cg_item = {
.ci_namebuf = "sdcardfs",
.ci_type = &sdcardfs_packages_type,
},
},
};
static int __init configfs_sdcardfs_init(void)
{
int ret;
struct configfs_subsystem *subsys = &sdcardfs_packages_subsys;
config_group_init(&subsys->su_group);
mutex_init(&subsys->su_mutex);
ret = configfs_register_subsystem(subsys);
if (ret) {
printk(KERN_ERR "Error %d while registering subsystem %s\n",
ret,
subsys->su_group.cg_item.ci_namebuf);
}
return ret;
}
static void __exit configfs_sdcardfs_exit(void)
{
configfs_unregister_subsystem(&sdcardfs_packages_subsys);
}
int packagelist_init(void)
{
hashtable_entry_cachep =
kmem_cache_create("packagelist_hashtable_entry",
sizeof(struct hashtable_entry), 0, 0, NULL);
if (!hashtable_entry_cachep) {
printk(KERN_ERR "sdcardfs: failed creating pkgl_hashtable entry slab cache\n");
return -ENOMEM;
}
pkgl_data_all = packagelist_create();
configfs_sdcardfs_init();
return 0;
}
void packagelist_exit(void)
{
configfs_sdcardfs_exit();
packagelist_destroy(pkgl_data_all);
if (hashtable_entry_cachep)
kmem_cache_destroy(hashtable_entry_cachep);
}
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