/* * 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/context.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){ struct aa_profile *task_profile; int error = 0; rcu_read_lock(); task_profile = aa_get_profile(aa_cred_profile(__task_cred(task))); rcu_read_unlock(); /* TODO: extend resource control to handle other (non current) * profiles. AppArmor rules currently have the implicit assumption * that the task is setting the resource of a task confined with * the same profile. */ if (profile != task_profile || (profile->rlimits.mask & (1 << resource) && new_rlim->rlim_max > profile->rlimits.limits[resource].rlim_max)) error = -EACCES; aa_put_profile(task_profile); 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); }}
/*
* 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/context.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)
{
struct aa_profile *task_profile;
int error = 0;
rcu_read_lock();
task_profile = aa_get_profile(aa_cred_profile(__task_cred(task)));
rcu_read_unlock();
/* TODO: extend resource control to handle other (non current)
* profiles. AppArmor rules currently have the implicit assumption
* that the task is setting the resource of a task confined with
* the same profile.
*/
if (profile != task_profile ||
(profile->rlimits.mask & (1 << resource) &&
new_rlim->rlim_max > profile->rlimits.limits[resource].rlim_max))
error = -EACCES;
aa_put_profile(task_profile);
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);
}
}