/* * 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_profile *profile, char **string){	char *str;	int len = 0, mode_len = 0, ns_len = 0, name_len;	const char *mode_str = aa_profile_mode_names[profile->mode];	const char *ns_name = NULL;	struct aa_namespace *ns = profile->ns;	struct aa_namespace *current_ns = __aa_current_profile()->ns;	char *s; 	if (!aa_ns_visible(current_ns, ns))		return -EACCES; 	ns_name = aa_ns_name(current_ns, ns);	ns_len = strlen(ns_name); 	/* if the visible ns_name is > 0 increase size for : :// seperator */	if (ns_len)		ns_len += 4; 	/* unconfined profiles don't have a mode string appended */	if (!unconfined(profile))		mode_len = strlen(mode_str) + 3;	/* + 3 for _() */ 	name_len = strlen(profile->base.hname);	len = mode_len + ns_len + name_len + 1;	    /* + 1 for \n */	s = str = kmalloc(len + 1, GFP_KERNEL);	    /* + 1 \0 */	if (!str)		return -ENOMEM; 	if (ns_len) {		/* skip over prefix current_ns->base.hname and separating // */		sprintf(s, ":%s://", ns_name);		s += ns_len;	}	if (unconfined(profile))		/* mode string not being appended */		sprintf(s, "%s\n", profile->base.hname);	else		sprintf(s, "%s (%s)\n", profile->base.hname, mode_str);	*string = str; 	/* NOTE: len does not include \0 of string, not saved as part of file */	return len;} /** * 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;			hat = next;		}	} 	AA_DEBUG("%s: Magic 0x%llx Hat '%s'\n",		 __func__, token, hat ? hat : 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);}