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kumaneko |
111 |
/* |
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* fs/sakura_chroot.c |
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* |
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* Implementation of the Domain-Free Mandatory Access Control. |
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* |
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kumaneko |
852 |
* Copyright (C) 2005-2008 NTT DATA CORPORATION |
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kumaneko |
111 |
* |
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kumaneko |
1330 |
* Version: 1.6.2 2008/06/25 |
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kumaneko |
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* |
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* This file is applicable to both 2.4.30 and 2.6.11 and later. |
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* See README.ccs for ChangeLog. |
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* |
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*/ |
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#include <linux/ccs_common.h> |
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#include <linux/sakura.h> |
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#include <linux/realpath.h> |
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kumaneko |
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
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kumaneko |
141 |
#include <linux/namei.h> |
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#else |
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#include <linux/fs.h> |
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#endif |
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kumaneko |
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|
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kumaneko |
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/* Structure for "allow_chroot" keyword. */ |
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kumaneko |
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struct chroot_entry { |
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kumaneko |
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struct list1_head list; |
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kumaneko |
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const struct path_info *dir; |
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kumaneko |
621 |
bool is_deleted; |
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kumaneko |
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}; |
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kumaneko |
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|
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kumaneko |
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/* The list for "struct chroot_entry". */ |
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kumaneko |
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static LIST1_HEAD(chroot_list); |
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kumaneko |
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|
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kumaneko |
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/** |
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* update_chroot_acl - Update "struct chroot_entry" list. |
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* |
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* @dir: The name of directory. |
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* @is_delete: True if it is a delete request. |
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* |
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* Returns 0 on success, negative value otherwise. |
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*/ |
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static int update_chroot_acl(const char *dir, const bool is_delete) |
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kumaneko |
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{ |
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kumaneko |
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struct chroot_entry *new_entry; |
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struct chroot_entry *ptr; |
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kumaneko |
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const struct path_info *saved_dir; |
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kumaneko |
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static DEFINE_MUTEX(lock); |
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kumaneko |
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int error = -ENOMEM; |
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kumaneko |
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if (!ccs_is_correct_path(dir, 1, 0, 1, __func__)) |
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return -EINVAL; |
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saved_dir = ccs_save_name(dir); |
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if (!saved_dir) |
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return -ENOMEM; |
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kumaneko |
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mutex_lock(&lock); |
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kumaneko |
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list1_for_each_entry(ptr, &chroot_list, list) { |
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kumaneko |
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if (ptr->dir != saved_dir) |
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continue; |
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ptr->is_deleted = is_delete; |
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error = 0; |
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goto out; |
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kumaneko |
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} |
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if (is_delete) { |
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error = -ENOENT; |
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goto out; |
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} |
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kumaneko |
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new_entry = ccs_alloc_element(sizeof(*new_entry)); |
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if (!new_entry) |
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goto out; |
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kumaneko |
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new_entry->dir = saved_dir; |
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kumaneko |
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list1_add_tail_mb(&new_entry->list, &chroot_list); |
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kumaneko |
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error = 0; |
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kumaneko |
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printk(KERN_CONT "%sAllow chroot() to %s\n", ccs_log_level, dir); |
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kumaneko |
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out: |
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kumaneko |
652 |
mutex_unlock(&lock); |
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kumaneko |
1064 |
ccs_update_counter(CCS_UPDATES_COUNTER_SYSTEM_POLICY); |
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kumaneko |
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return error; |
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} |
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kumaneko |
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/** |
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* print_error - Print error message. |
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* |
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* @root_name: Requested directory name. |
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* @mode: Access control mode. |
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* |
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* Returns 0 if @mode is not enforcing mode or permitted by the administrator's |
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* decision, negative value otherwise. |
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*/ |
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kumaneko |
1064 |
static int print_error(const char *root_name, const u8 mode) |
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kumaneko |
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{ |
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kumaneko |
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int error; |
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kumaneko |
1052 |
const bool is_enforce = (mode == 3); |
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const char *exename = ccs_get_exe(); |
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printk(KERN_WARNING "SAKURA-%s: chroot %s (pid=%d:exe=%s): " |
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"Permission denied.\n", ccs_get_msg(is_enforce), |
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root_name, current->pid, exename); |
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kumaneko |
1064 |
if (is_enforce) |
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kumaneko |
1260 |
error = ccs_check_supervisor(NULL, "# %s is requesting\n" |
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kumaneko |
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"chroot %s\n", exename, root_name); |
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else |
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kumaneko |
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error = 0; |
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if (exename) |
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ccs_free(exename); |
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kumaneko |
1064 |
if (mode == 1 && root_name) |
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update_chroot_acl(root_name, false); |
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kumaneko |
1052 |
return error; |
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} |
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/** |
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* ccs_check_chroot_permission - Check permission for chroot(). |
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* |
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* @nd: Pointer to "struct nameidata". |
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* |
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* Returns 0 on success, negative value otherwise. |
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*/ |
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int ccs_check_chroot_permission(struct nameidata *nd) |
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{ |
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kumaneko |
141 |
int error = -EPERM; |
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char *root_name; |
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kumaneko |
1052 |
const u8 mode = ccs_check_flags(CCS_SAKURA_RESTRICT_CHROOT); |
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if (!mode) |
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return 0; |
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
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root_name = ccs_realpath_from_dentry(nd->path.dentry, nd->path.mnt); |
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kumaneko |
990 |
#else |
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kumaneko |
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root_name = ccs_realpath_from_dentry(nd->dentry, nd->mnt); |
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kumaneko |
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#endif |
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kumaneko |
141 |
if (root_name) { |
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kumaneko |
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struct path_info dir; |
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kumaneko |
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dir.name = root_name; |
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kumaneko |
1052 |
ccs_fill_path_info(&dir); |
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kumaneko |
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if (dir.is_dir) { |
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kumaneko |
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struct chroot_entry *ptr; |
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kumaneko |
722 |
list1_for_each_entry(ptr, &chroot_list, list) { |
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kumaneko |
1052 |
if (ptr->is_deleted) |
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continue; |
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kumaneko |
1064 |
if (!ccs_path_matches_pattern(&dir, ptr->dir)) |
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continue; |
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error = 0; |
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break; |
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kumaneko |
111 |
} |
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} |
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} |
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kumaneko |
1052 |
if (error) |
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kumaneko |
1064 |
error = print_error(root_name, mode); |
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kumaneko |
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ccs_free(root_name); |
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return error; |
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kumaneko |
111 |
} |
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kumaneko |
1052 |
/** |
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* ccs_write_chroot_policy - Write "struct chroot_entry" list. |
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* |
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* @data: String to parse. |
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* @is_delete: True if it is a delete request. |
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* |
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* Returns 0 on success, negative value otherwise. |
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*/ |
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int ccs_write_chroot_policy(char *data, const bool is_delete) |
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kumaneko |
111 |
{ |
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kumaneko |
1052 |
return update_chroot_acl(data, is_delete); |
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kumaneko |
111 |
} |
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162 |
kumaneko |
1052 |
/** |
163 |
kumaneko |
1054 |
* ccs_read_chroot_policy - Read "struct chroot_entry" list. |
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kumaneko |
1052 |
* |
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* @head: Pointer to "struct ccs_io_buffer". |
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* |
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* Returns true on success, false otherwise. |
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*/ |
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bool ccs_read_chroot_policy(struct ccs_io_buffer *head) |
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kumaneko |
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{ |
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kumaneko |
722 |
struct list1_head *pos; |
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list1_for_each_cookie(pos, head->read_var2, &chroot_list) { |
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kumaneko |
708 |
struct chroot_entry *ptr; |
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kumaneko |
722 |
ptr = list1_entry(pos, struct chroot_entry, list); |
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kumaneko |
1052 |
if (ptr->is_deleted) |
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continue; |
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if (!ccs_io_printf(head, KEYWORD_ALLOW_CHROOT "%s\n", |
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ptr->dir->name)) |
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goto out; |
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kumaneko |
111 |
} |
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kumaneko |
1052 |
return true; |
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out: |
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return false; |
184 |
kumaneko |
111 |
} |