ipc.rar_IPC

/* * 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; struct apparmor_audit_data aad = {0,}; sa.type = LSM_AUDIT_DATA_NONE; sa.aad = &aad; aad.op = OP_PTRACE; aad.target = target; 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: 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 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, 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 = aa_get_task_profile(tracer); int error = 0; if (!unconfined(tracer_p)) { struct aa_profile *tracee_p = aa_get_task_profile(tracee); error = aa_may_ptrace(tracer_p, tracee_p, mode); error = aa_audit_ptrace(tracer_p, tracee_p, error); aa_put_profile(tracee_p); } aa_put_profile(tracer_p); return error; }