/* * AppArmor security module * * This file contains AppArmor ipc mediation * * 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/gfp.h>#include <linux/ptrace.h> #include "include/audit.h"#include "include/capability.h"#include "include/context.h"#include "include/policy.h"#include "include/ipc.h" /* call back to audit ptrace fields */static void audit_cb(struct audit_buffer *ab, void *va){	struct common_audit_data *sa = va;	audit_log_format(ab, " target=");	audit_log_untrustedstring(ab, sa->aad.target);} /** * aa_audit_ptrace - do auditing for ptrace * @profile: profile being enforced  (NOT NULL) * @target: profile being traced (NOT NULL) * @error: error condition * * Returns: %0 or error code */static int aa_audit_ptrace(struct aa_profile *profile,			   struct aa_profile *target, int error){	struct common_audit_data sa;	COMMON_AUDIT_DATA_INIT(&sa, NONE);	sa.aad.op = OP_PTRACE;	sa.aad.target = target;	sa.aad.error = error; 	return aa_audit(AUDIT_APPARMOR_AUTO, profile, GFP_ATOMIC, &sa,			audit_cb);} /** * aa_may_ptrace - test if tracer task can trace the tracee * @tracer_task: task who will do the tracing  (NOT NULL) * @tracer: profile of the task doing the tracing  (NOT NULL) * @tracee: task to be traced * @mode: whether PTRACE_MODE_READ || PTRACE_MODE_ATTACH * * Returns: %0 else error code if permission denied or error */int aa_may_ptrace(struct task_struct *tracer_task, struct aa_profile *tracer,		  struct aa_profile *tracee, unsigned int mode){	/* TODO: currently only based on capability, not extended ptrace	 *       rules,	 *       Test mode for PTRACE_MODE_READ || PTRACE_MODE_ATTACH	 */ 	if (unconfined(tracer) || tracer == tracee)		return 0;	/* log this capability request */	return aa_capable(tracer_task, tracer, CAP_SYS_PTRACE, 1);} /** * aa_ptrace - do ptrace permission check and auditing * @tracer: task doing the tracing (NOT NULL) * @tracee: task being traced (NOT NULL) * @mode: ptrace mode either PTRACE_MODE_READ || PTRACE_MODE_ATTACH * * Returns: %0 else error code if permission denied or error */int aa_ptrace(struct task_struct *tracer, struct task_struct *tracee,	      unsigned int mode){	/*	 * tracer can ptrace tracee when	 * - tracer is unconfined ||	 *   - tracer is in complain mode	 *   - tracer has rules allowing it to trace tracee currently this is:	 *       - confined by the same profile ||	 *       - tracer profile has CAP_SYS_PTRACE	 */ 	struct aa_profile *tracer_p;	/* cred released below */	const struct cred *cred = get_task_cred(tracer);	int error = 0;	tracer_p = aa_cred_profile(cred); 	if (!unconfined(tracer_p)) {		/* lcred released below */		const struct cred *lcred = get_task_cred(tracee);		struct aa_profile *tracee_p = aa_cred_profile(lcred); 		error = aa_may_ptrace(tracer, tracer_p, tracee_p, mode);		error = aa_audit_ptrace(tracer_p, tracee_p, error); 		put_cred(lcred);	}	put_cred(cred); 	return error;}