text: /*
   * AppArmor security module
   *
   * This file contains AppArmor /proc/<pid>/attr/ interface functions
   *
   * Copyright (C) 1998-2008 Novell/SUSE
   * Copyright 2009-2010 Canonical Ltd.
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License as
   * published by the Free Software Foundation, version 2 of the
   * License.
   */
  
  #include "include/apparmor.h"
  #include "include/context.h"
  #include "include/policy.h"
  #include "include/domain.h"
  #include "include/procattr.h"
  
  
  /**
   * aa_getprocattr - Return the profile information for @profile
   * @profile: the profile to print profile info about  (NOT NULL)
   * @string: Returns - string containing the profile info (NOT NULL)
   *
   * Returns: length of @string on success else error on failure
   *
   * Requires: profile != NULL
   *
   * Creates a string containing the namespace_name://profile_name for
   * @profile.
   *
   * Returns: size of string placed in @string else error code on failure
   */
  int aa_getprocattr(struct aa_label *label, char **string)
  {
  	struct aa_namespace *ns = labels_ns(label);
  	struct aa_namespace *current_ns = labels_ns(__aa_current_label());
  	int len;
  
  	if (!aa_ns_visible(current_ns, ns))
  		return -EACCES;
  
  	len = aa_label_snprint(NULL, 0, current_ns, label, true);
  	AA_BUG(len < 0);
  
  	*string = kmalloc(len + 2, GFP_KERNEL);
  	if (!*string)
  		return -ENOMEM;
  
  	len = aa_label_snprint(*string, len + 2, current_ns, label, true);
  	if (len < 0)
  		return len;
  	(*string)[len] = '\n';
  	(*string)[len + 1] = 0;
  
  	return len + 1;
  }
  
  /**
   * split_token_from_name - separate a string of form  <token>^<name>
   * @op: operation being checked
   * @args: string to parse  (NOT NULL)
   * @token: stores returned parsed token value  (NOT NULL)
   *
   * Returns: start position of name after token else NULL on failure
   */
  static char *split_token_from_name(int op, char *args, u64 * token)
  {
  	char *name;
  
  	*token = simple_strtoull(args, &name, 16);
  	if ((name == args) || *name != '^') {
  		AA_ERROR("%s: Invalid input '%s'", op_table[op], args);
  		return ERR_PTR(-EINVAL);
  	}
  
  	name++;			/* skip ^ */
  	if (!*name)
  		name = NULL;
  	return name;
  }
  
  /**
   * aa_setprocattr_chagnehat - handle procattr interface to change_hat
   * @args: args received from writing to /proc/<pid>/attr/current (NOT NULL)
   * @size: size of the args
   * @test: true if this is a test of change_hat permissions
   *
   * Returns: %0 or error code if change_hat fails
   */
  int aa_setprocattr_changehat(char *args, size_t size, int test)
  {
  	char *hat;
  	u64 token;
  	const char *hats[16];		/* current hard limit on # of names */
  	int count = 0;
  
  	hat = split_token_from_name(OP_CHANGE_HAT, args, &token);
  	if (IS_ERR(hat))
  		return PTR_ERR(hat);
  
  	if (!hat && !token) {
  		AA_ERROR("change_hat: Invalid input, NULL hat and NULL magic");
  		return -EINVAL;
  	}
  
  	if (hat) {
  		/* set up hat name vector, args guaranteed null terminated
  		 * at args[size] by setprocattr.
  		 *
  		 * If there are multiple hat names in the buffer each is
  		 * separated by a \0.  Ie. userspace writes them pre tokenized
  		 */
  		char *end = args + size;
  		for (count = 0; (hat < end) && count < 16; ++count) {
  			char *next = hat + strlen(hat) + 1;
  			hats[count] = hat;
  			AA_DEBUG("%s: (pid %d) Magic 0x%llx count %d hat '%s'\n"
  				 , __func__, current->pid, token, count, hat);
  			hat = next;
  		}
  	} else
  		AA_DEBUG("%s: (pid %d) Magic 0x%llx count %d Hat '%s'\n",
  			 __func__, current->pid, token, count, "<NULL>");
  
  	return aa_change_hat(hats, count, token, test);
  }
  
  /**
   * aa_setprocattr_changeprofile - handle procattr interface to changeprofile
   * @fqname: args received from writting to /proc/<pid>/attr/current (NOT NULL)
   * @onexec: true if change_profile should be delayed until exec
   * @test: true if this is a test of change_profile permissions
   *
   * Returns: %0 or error code if change_profile fails
   */
  int aa_setprocattr_changeprofile(char *fqname, bool onexec, int test)
  {
  	char *name, *ns_name;
  
  	name = aa_split_fqname(fqname, &ns_name);
  	return aa_change_profile(ns_name, name, onexec, test);
  }
  