ima: hashing large files bug fix
[linux-2.6.git] / security / security.c
index 28b2860..dc7674f 100644 (file)
 /* Boot-time LSM user choice */
 static __initdata char chosen_lsm[SECURITY_NAME_MAX + 1];
 
-/* things that live in dummy.c */
-extern struct security_operations dummy_security_ops;
+/* things that live in capability.c */
+extern struct security_operations default_security_ops;
 extern void security_fixup_ops(struct security_operations *ops);
 
 struct security_operations *security_ops;      /* Initialized to NULL */
 
-/* amount of vm to protect from userspace access */
-unsigned long mmap_min_addr = CONFIG_SECURITY_DEFAULT_MMAP_MIN_ADDR;
-
 static inline int verify(struct security_operations *ops)
 {
        /* verify the security_operations structure exists */
@@ -57,13 +54,8 @@ int __init security_init(void)
 {
        printk(KERN_INFO "Security Framework initialized\n");
 
-       if (verify(&dummy_security_ops)) {
-               printk(KERN_ERR "%s could not verify "
-                      "dummy_security_ops structure.\n", __func__);
-               return -EIO;
-       }
-
-       security_ops = &dummy_security_ops;
+       security_fixup_ops(&default_security_ops);
+       security_ops = &default_security_ops;
        do_security_initcalls();
 
        return 0;
@@ -87,8 +79,8 @@ __setup("security=", choose_lsm);
  *
  * Return true if:
  *     -The passed LSM is the one chosen by user at boot time,
- *     -or user didsn't specify a specific LSM and we're the first to ask
- *      for registeration permissoin,
+ *     -or user didn't specify a specific LSM and we're the first to ask
+ *      for registration permission,
  *     -or the passed LSM is currently loaded.
  * Otherwise, return false.
  */
@@ -106,13 +98,13 @@ int __init security_module_enable(struct security_operations *ops)
  * register_security - registers a security framework with the kernel
  * @ops: a pointer to the struct security_options that is to be registered
  *
- * This function is to allow a security module to register itself with the
+ * This function allows a security module to register itself with the
  * kernel security subsystem.  Some rudimentary checking is done on the @ops
  * value passed to this function. You'll need to check first if your LSM
  * is allowed to register its @ops by calling security_module_enable(@ops).
  *
  * If there is already a security module registered with the kernel,
- * an error will be returned.  Otherwise 0 is returned on success.
+ * an error will be returned.  Otherwise %0 is returned on success.
  */
 int register_security(struct security_operations *ops)
 {
@@ -122,7 +114,7 @@ int register_security(struct security_operations *ops)
                return -EINVAL;
        }
 
-       if (security_ops != &dummy_security_ops)
+       if (security_ops != &default_security_ops)
                return -EAGAIN;
 
        security_ops = ops;
@@ -130,41 +122,16 @@ int register_security(struct security_operations *ops)
        return 0;
 }
 
-/**
- * mod_reg_security - allows security modules to be "stacked"
- * @name: a pointer to a string with the name of the security_options to be registered
- * @ops: a pointer to the struct security_options that is to be registered
- *
- * This function allows security modules to be stacked if the currently loaded
- * security module allows this to happen.  It passes the @name and @ops to the
- * register_security function of the currently loaded security module.
- *
- * The return value depends on the currently loaded security module, with 0 as
- * success.
- */
-int mod_reg_security(const char *name, struct security_operations *ops)
-{
-       if (verify(ops)) {
-               printk(KERN_INFO "%s could not verify "
-                      "security operations.\n", __func__);
-               return -EINVAL;
-       }
-
-       if (ops == security_ops) {
-               printk(KERN_INFO "%s security operations "
-                      "already registered.\n", __func__);
-               return -EINVAL;
-       }
+/* Security operations */
 
-       return security_ops->register_security(name, ops);
+int security_ptrace_may_access(struct task_struct *child, unsigned int mode)
+{
+       return security_ops->ptrace_may_access(child, mode);
 }
 
-/* Security operations */
-
-int security_ptrace(struct task_struct *parent, struct task_struct *child,
-                   unsigned int mode)
+int security_ptrace_traceme(struct task_struct *parent)
 {
-       return security_ops->ptrace(parent, child, mode);
+       return security_ops->ptrace_traceme(parent);
 }
 
 int security_capget(struct task_struct *target,
@@ -175,25 +142,41 @@ int security_capget(struct task_struct *target,
        return security_ops->capget(target, effective, inheritable, permitted);
 }
 
-int security_capset_check(struct task_struct *target,
-                          kernel_cap_t *effective,
-                          kernel_cap_t *inheritable,
-                          kernel_cap_t *permitted)
+int security_capset(struct cred *new, const struct cred *old,
+                   const kernel_cap_t *effective,
+                   const kernel_cap_t *inheritable,
+                   const kernel_cap_t *permitted)
+{
+       return security_ops->capset(new, old,
+                                   effective, inheritable, permitted);
+}
+
+int security_capable(int cap)
 {
-       return security_ops->capset_check(target, effective, inheritable, permitted);
+       return security_ops->capable(current, current_cred(), cap,
+                                    SECURITY_CAP_AUDIT);
 }
 
-void security_capset_set(struct task_struct *target,
-                         kernel_cap_t *effective,
-                         kernel_cap_t *inheritable,
-                         kernel_cap_t *permitted)
+int security_real_capable(struct task_struct *tsk, int cap)
 {
-       security_ops->capset_set(target, effective, inheritable, permitted);
+       const struct cred *cred;
+       int ret;
+
+       cred = get_task_cred(tsk);
+       ret = security_ops->capable(tsk, cred, cap, SECURITY_CAP_AUDIT);
+       put_cred(cred);
+       return ret;
 }
 
-int security_capable(struct task_struct *tsk, int cap)
+int security_real_capable_noaudit(struct task_struct *tsk, int cap)
 {
-       return security_ops->capable(tsk, cap);
+       const struct cred *cred;
+       int ret;
+
+       cred = get_task_cred(tsk);
+       ret = security_ops->capable(tsk, cred, cap, SECURITY_CAP_NOAUDIT);
+       put_cred(cred);
+       return ret;
 }
 
 int security_acct(struct file *file)
@@ -228,42 +211,41 @@ int security_settime(struct timespec *ts, struct timezone *tz)
 
 int security_vm_enough_memory(long pages)
 {
+       WARN_ON(current->mm == NULL);
        return security_ops->vm_enough_memory(current->mm, pages);
 }
 
 int security_vm_enough_memory_mm(struct mm_struct *mm, long pages)
 {
+       WARN_ON(mm == NULL);
        return security_ops->vm_enough_memory(mm, pages);
 }
 
-int security_bprm_alloc(struct linux_binprm *bprm)
-{
-       return security_ops->bprm_alloc_security(bprm);
-}
-
-void security_bprm_free(struct linux_binprm *bprm)
+int security_vm_enough_memory_kern(long pages)
 {
-       security_ops->bprm_free_security(bprm);
+       /* If current->mm is a kernel thread then we will pass NULL,
+          for this specific case that is fine */
+       return security_ops->vm_enough_memory(current->mm, pages);
 }
 
-void security_bprm_apply_creds(struct linux_binprm *bprm, int unsafe)
+int security_bprm_set_creds(struct linux_binprm *bprm)
 {
-       security_ops->bprm_apply_creds(bprm, unsafe);
+       return security_ops->bprm_set_creds(bprm);
 }
 
-void security_bprm_post_apply_creds(struct linux_binprm *bprm)
+int security_bprm_check(struct linux_binprm *bprm)
 {
-       security_ops->bprm_post_apply_creds(bprm);
+       return security_ops->bprm_check_security(bprm);
 }
 
-int security_bprm_set(struct linux_binprm *bprm)
+void security_bprm_committing_creds(struct linux_binprm *bprm)
 {
-       return security_ops->bprm_set_security(bprm);
+       security_ops->bprm_committing_creds(bprm);
 }
 
-int security_bprm_check(struct linux_binprm *bprm)
+void security_bprm_committed_creds(struct linux_binprm *bprm)
 {
-       return security_ops->bprm_check_security(bprm);
+       security_ops->bprm_committed_creds(bprm);
 }
 
 int security_bprm_secureexec(struct linux_binprm *bprm)
@@ -287,9 +269,9 @@ int security_sb_copy_data(char *orig, char *copy)
 }
 EXPORT_SYMBOL(security_sb_copy_data);
 
-int security_sb_kern_mount(struct super_block *sb, void *data)
+int security_sb_kern_mount(struct super_block *sb, int flags, void *data)
 {
-       return security_ops->sb_kern_mount(sb, data);
+       return security_ops->sb_kern_mount(sb, flags, data);
 }
 
 int security_sb_show_options(struct seq_file *m, struct super_block *sb)
@@ -388,12 +370,79 @@ int security_inode_init_security(struct inode *inode, struct inode *dir,
 }
 EXPORT_SYMBOL(security_inode_init_security);
 
+#ifdef CONFIG_SECURITY_PATH
+int security_path_mknod(struct path *path, struct dentry *dentry, int mode,
+                       unsigned int dev)
+{
+       if (unlikely(IS_PRIVATE(path->dentry->d_inode)))
+               return 0;
+       return security_ops->path_mknod(path, dentry, mode, dev);
+}
+EXPORT_SYMBOL(security_path_mknod);
+
+int security_path_mkdir(struct path *path, struct dentry *dentry, int mode)
+{
+       if (unlikely(IS_PRIVATE(path->dentry->d_inode)))
+               return 0;
+       return security_ops->path_mkdir(path, dentry, mode);
+}
+
+int security_path_rmdir(struct path *path, struct dentry *dentry)
+{
+       if (unlikely(IS_PRIVATE(path->dentry->d_inode)))
+               return 0;
+       return security_ops->path_rmdir(path, dentry);
+}
+
+int security_path_unlink(struct path *path, struct dentry *dentry)
+{
+       if (unlikely(IS_PRIVATE(path->dentry->d_inode)))
+               return 0;
+       return security_ops->path_unlink(path, dentry);
+}
+
+int security_path_symlink(struct path *path, struct dentry *dentry,
+                         const char *old_name)
+{
+       if (unlikely(IS_PRIVATE(path->dentry->d_inode)))
+               return 0;
+       return security_ops->path_symlink(path, dentry, old_name);
+}
+
+int security_path_link(struct dentry *old_dentry, struct path *new_dir,
+                      struct dentry *new_dentry)
+{
+       if (unlikely(IS_PRIVATE(old_dentry->d_inode)))
+               return 0;
+       return security_ops->path_link(old_dentry, new_dir, new_dentry);
+}
+
+int security_path_rename(struct path *old_dir, struct dentry *old_dentry,
+                        struct path *new_dir, struct dentry *new_dentry)
+{
+       if (unlikely(IS_PRIVATE(old_dentry->d_inode) ||
+                    (new_dentry->d_inode && IS_PRIVATE(new_dentry->d_inode))))
+               return 0;
+       return security_ops->path_rename(old_dir, old_dentry, new_dir,
+                                        new_dentry);
+}
+
+int security_path_truncate(struct path *path, loff_t length,
+                          unsigned int time_attrs)
+{
+       if (unlikely(IS_PRIVATE(path->dentry->d_inode)))
+               return 0;
+       return security_ops->path_truncate(path, length, time_attrs);
+}
+#endif
+
 int security_inode_create(struct inode *dir, struct dentry *dentry, int mode)
 {
        if (unlikely(IS_PRIVATE(dir)))
                return 0;
        return security_ops->inode_create(dir, dentry, mode);
 }
+EXPORT_SYMBOL_GPL(security_inode_create);
 
 int security_inode_link(struct dentry *old_dentry, struct inode *dir,
                         struct dentry *new_dentry)
@@ -424,6 +473,7 @@ int security_inode_mkdir(struct inode *dir, struct dentry *dentry, int mode)
                return 0;
        return security_ops->inode_mkdir(dir, dentry, mode);
 }
+EXPORT_SYMBOL_GPL(security_inode_mkdir);
 
 int security_inode_rmdir(struct inode *dir, struct dentry *dentry)
 {
@@ -463,11 +513,11 @@ int security_inode_follow_link(struct dentry *dentry, struct nameidata *nd)
        return security_ops->inode_follow_link(dentry, nd);
 }
 
-int security_inode_permission(struct inode *inode, int mask, struct nameidata *nd)
+int security_inode_permission(struct inode *inode, int mask)
 {
        if (unlikely(IS_PRIVATE(inode)))
                return 0;
-       return security_ops->inode_permission(inode, mask, nd);
+       return security_ops->inode_permission(inode, mask);
 }
 
 int security_inode_setattr(struct dentry *dentry, struct iattr *attr)
@@ -476,6 +526,7 @@ int security_inode_setattr(struct dentry *dentry, struct iattr *attr)
                return 0;
        return security_ops->inode_setattr(dentry, attr);
 }
+EXPORT_SYMBOL_GPL(security_inode_setattr);
 
 int security_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
 {
@@ -623,9 +674,9 @@ int security_file_receive(struct file *file)
        return security_ops->file_receive(file);
 }
 
-int security_dentry_open(struct file *file)
+int security_dentry_open(struct file *file, const struct cred *cred)
 {
-       return security_ops->dentry_open(file);
+       return security_ops->dentry_open(file, cred);
 }
 
 int security_task_create(unsigned long clone_flags)
@@ -633,14 +684,29 @@ int security_task_create(unsigned long clone_flags)
        return security_ops->task_create(clone_flags);
 }
 
-int security_task_alloc(struct task_struct *p)
+void security_cred_free(struct cred *cred)
+{
+       security_ops->cred_free(cred);
+}
+
+int security_prepare_creds(struct cred *new, const struct cred *old, gfp_t gfp)
+{
+       return security_ops->cred_prepare(new, old, gfp);
+}
+
+void security_commit_creds(struct cred *new, const struct cred *old)
 {
-       return security_ops->task_alloc_security(p);
+       security_ops->cred_commit(new, old);
 }
 
-void security_task_free(struct task_struct *p)
+int security_kernel_act_as(struct cred *new, u32 secid)
 {
-       security_ops->task_free_security(p);
+       return security_ops->kernel_act_as(new, secid);
+}
+
+int security_kernel_create_files_as(struct cred *new, struct inode *inode)
+{
+       return security_ops->kernel_create_files_as(new, inode);
 }
 
 int security_task_setuid(uid_t id0, uid_t id1, uid_t id2, int flags)
@@ -648,10 +714,10 @@ int security_task_setuid(uid_t id0, uid_t id1, uid_t id2, int flags)
        return security_ops->task_setuid(id0, id1, id2, flags);
 }
 
-int security_task_post_setuid(uid_t old_ruid, uid_t old_euid,
-                              uid_t old_suid, int flags)
+int security_task_fix_setuid(struct cred *new, const struct cred *old,
+                            int flags)
 {
-       return security_ops->task_post_setuid(old_ruid, old_euid, old_suid, flags);
+       return security_ops->task_fix_setuid(new, old, flags);
 }
 
 int security_task_setgid(gid_t id0, gid_t id1, gid_t id2, int flags)
@@ -733,14 +799,9 @@ int security_task_wait(struct task_struct *p)
 }
 
 int security_task_prctl(int option, unsigned long arg2, unsigned long arg3,
-                        unsigned long arg4, unsigned long arg5, long *rc_p)
-{
-       return security_ops->task_prctl(option, arg2, arg3, arg4, arg5, rc_p);
-}
-
-void security_task_reparent_to_init(struct task_struct *p)
+                        unsigned long arg4, unsigned long arg5)
 {
-       security_ops->task_reparent_to_init(p);
+       return security_ops->task_prctl(option, arg2, arg3, arg4, arg5);
 }
 
 void security_task_to_inode(struct task_struct *p, struct inode *inode)
@@ -945,11 +1006,6 @@ int security_socket_accept(struct socket *sock, struct socket *newsock)
        return security_ops->socket_accept(sock, newsock);
 }
 
-void security_socket_post_accept(struct socket *sock, struct socket *newsock)
-{
-       security_ops->socket_post_accept(sock, newsock);
-}
-
 int security_socket_sendmsg(struct socket *sock, struct msghdr *msg, int size)
 {
        return security_ops->socket_sendmsg(sock, msg, size);
@@ -1140,9 +1196,10 @@ EXPORT_SYMBOL(security_skb_classify_flow);
 
 #ifdef CONFIG_KEYS
 
-int security_key_alloc(struct key *key, struct task_struct *tsk, unsigned long flags)
+int security_key_alloc(struct key *key, const struct cred *cred,
+                      unsigned long flags)
 {
-       return security_ops->key_alloc(key, tsk, flags);
+       return security_ops->key_alloc(key, cred, flags);
 }
 
 void security_key_free(struct key *key)
@@ -1151,9 +1208,9 @@ void security_key_free(struct key *key)
 }
 
 int security_key_permission(key_ref_t key_ref,
-                           struct task_struct *context, key_perm_t perm)
+                           const struct cred *cred, key_perm_t perm)
 {
-       return security_ops->key_permission(key_ref, context, perm);
+       return security_ops->key_permission(key_ref, cred, perm);
 }
 
 int security_key_getsecurity(struct key *key, char **_buffer)