/* * AppArmor security module * * This file contains AppArmor resource mediation and attachment * * 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 <linux/audit.h> #include "include/audit.h"#include "include/resource.h"#include "include/policy.h" /* * Table of rlimit names: we generate it from resource.h. */#include "rlim_names.h" struct aa_fs_entry aa_fs_entry_rlimit[] = {	AA_FS_FILE_STRING("mask", AA_FS_RLIMIT_MASK),	{ }}; /* audit callback for resource specific fields */static void audit_cb(struct audit_buffer *ab, void *va){	struct common_audit_data *sa = va; 	audit_log_format(ab, " rlimit=%s value=%lu",			 rlim_names[sa->aad->rlim.rlim], sa->aad->rlim.max);} /** * audit_resource - audit setting resource limit * @profile: profile being enforced  (NOT NULL) * @resoure: rlimit being auditing * @value: value being set * @error: error value * * Returns: 0 or sa->error else other error code on failure */static int audit_resource(struct aa_profile *profile, unsigned int resource,			  unsigned long value, int error){	struct common_audit_data sa;	struct apparmor_audit_data aad = {0,}; 	sa.type = LSM_AUDIT_DATA_NONE;	sa.aad = &aad;	aad.op = OP_SETRLIMIT,	aad.rlim.rlim = resource;	aad.rlim.max = value;	aad.error = error;	return aa_audit(AUDIT_APPARMOR_AUTO, profile, GFP_KERNEL, &sa,			audit_cb);} /** * aa_map_resouce - map compiled policy resource to internal # * @resource: flattened policy resource number * * Returns: resource # for the current architecture. * * rlimit resource can vary based on architecture, map the compiled policy * resource # to the internal representation for the architecture. */int aa_map_resource(int resource){	return rlim_map[resource];} /** * aa_task_setrlimit - test permission to set an rlimit * @profile - profile confining the task  (NOT NULL) * @task - task the resource is being set on * @resource - the resource being set * @new_rlim - the new resource limit  (NOT NULL) * * Control raising the processes hard limit. * * Returns: 0 or error code if setting resource failed */int aa_task_setrlimit(struct aa_profile *profile, struct task_struct *task,		      unsigned int resource, struct rlimit *new_rlim){	int error = 0; 	/* TODO: extend resource control to handle other (non current)	 * processes.  AppArmor rules currently have the implicit assumption	 * that the task is setting the resource of the current process	 */	if ((task != current->group_leader) ||	    (profile->rlimits.mask & (1 << resource) &&	     new_rlim->rlim_max > profile->rlimits.limits[resource].rlim_max))		error = -EACCES; 	return audit_resource(profile, resource, new_rlim->rlim_max, error);} /** * __aa_transition_rlimits - apply new profile rlimits * @old: old profile on task  (NOT NULL) * @new: new profile with rlimits to apply  (NOT NULL) */void __aa_transition_rlimits(struct aa_profile *old, struct aa_profile *new){	unsigned int mask = 0;	struct rlimit *rlim, *initrlim;	int i; 	/* for any rlimits the profile controlled reset the soft limit	 * to the less of the tasks hard limit and the init tasks soft limit	 */	if (old->rlimits.mask) {		for (i = 0, mask = 1; i < RLIM_NLIMITS; i++, mask <<= 1) {			if (old->rlimits.mask & mask) {				rlim = current->signal->rlim + i;				initrlim = init_task.signal->rlim + i;				rlim->rlim_cur = min(rlim->rlim_max,						     initrlim->rlim_cur);			}		}	} 	/* set any new hard limits as dictated by the new profile */	if (!new->rlimits.mask)		return;	for (i = 0, mask = 1; i < RLIM_NLIMITS; i++, mask <<= 1) {		if (!(new->rlimits.mask & mask))			continue; 		rlim = current->signal->rlim + i;		rlim->rlim_max = min(rlim->rlim_max,				     new->rlimits.limits[i].rlim_max);		/* soft limit should not exceed hard limit */		rlim->rlim_cur = min(rlim->rlim_cur, rlim->rlim_max);	}}