/* * AppArmor security module * * This file contains AppArmor capability mediation 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 <linux/capability.h>#include <linux/errno.h>#include <linux/gfp.h> #include "include/apparmor.h"#include "include/capability.h"#include "include/context.h"#include "include/policy.h"#include "include/audit.h" /* * Table of capability names: we generate it from capabilities.h. */#include "capability_names.h" struct audit_cache {	struct aa_profile *profile;	kernel_cap_t caps;}; static DEFINE_PER_CPU(struct audit_cache, audit_cache); /** * audit_cb - call back for capability components of audit struct * @ab - audit buffer   (NOT NULL) * @va - audit struct to audit data from  (NOT NULL) */static void audit_cb(struct audit_buffer *ab, void *va){	struct common_audit_data *sa = va;	audit_log_format(ab, " capname=");	audit_log_untrustedstring(ab, capability_names[sa->u.cap]);} /** * audit_caps - audit a capability * @profile: profile confining task (NOT NULL) * @task: task capability test was performed against (NOT NULL) * @cap: capability tested * @error: error code returned by test * * Do auditing of capability and handle, audit/complain/kill modes switching * and duplicate message elimination. * * Returns: 0 or sa->error on success,  error code on failure */static int audit_caps(struct aa_profile *profile, struct task_struct *task,		      int cap, int error){	struct audit_cache *ent;	int type = AUDIT_APPARMOR_AUTO;	struct common_audit_data sa;	COMMON_AUDIT_DATA_INIT(&sa, CAP);	sa.tsk = task;	sa.u.cap = cap;	sa.aad.op = OP_CAPABLE;	sa.aad.error = error; 	if (likely(!error)) {		/* test if auditing is being forced */		if (likely((AUDIT_MODE(profile) != AUDIT_ALL) &&			   !cap_raised(profile->caps.audit, cap)))			return 0;		type = AUDIT_APPARMOR_AUDIT;	} else if (KILL_MODE(profile) ||		   cap_raised(profile->caps.kill, cap)) {		type = AUDIT_APPARMOR_KILL;	} else if (cap_raised(profile->caps.quiet, cap) &&		   AUDIT_MODE(profile) != AUDIT_NOQUIET &&		   AUDIT_MODE(profile) != AUDIT_ALL) {		/* quiet auditing */		return error;	} 	/* Do simple duplicate message elimination */	ent = &get_cpu_var(audit_cache);	if (profile == ent->profile && cap_raised(ent->caps, cap)) {		put_cpu_var(audit_cache);		if (COMPLAIN_MODE(profile))			return complain_error(error);		return error;	} else {		aa_put_profile(ent->profile);		ent->profile = aa_get_profile(profile);		cap_raise(ent->caps, cap);	}	put_cpu_var(audit_cache); 	return aa_audit(type, profile, GFP_ATOMIC, &sa, audit_cb);} /** * profile_capable - test if profile allows use of capability @cap * @profile: profile being enforced    (NOT NULL, NOT unconfined) * @cap: capability to test if allowed * * Returns: 0 if allowed else -EPERM */static int profile_capable(struct aa_profile *profile, int cap){	return cap_raised(profile->caps.allow, cap) ? 0 : -EPERM;} /** * aa_capable - test permission to use capability * @task: task doing capability test against (NOT NULL) * @profile: profile confining @task (NOT NULL) * @cap: capability to be tested * @audit: whether an audit record should be generated * * Look up capability in profile capability set. * * Returns: 0 on success, or else an error code. */int aa_capable(struct task_struct *task, struct aa_profile *profile, int cap,	       int audit){	int error = profile_capable(profile, cap); 	if (!audit) {		if (COMPLAIN_MODE(profile))			return complain_error(error);		return error;	} 	return audit_caps(profile, task, cap, error);}