mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-21 08:27:01 +07:00
124 lines
3.3 KiB
C
124 lines
3.3 KiB
C
/*
|
|
* AppArmor security module
|
|
*
|
|
* This file contains AppArmor ipc mediation
|
|
*
|
|
* Copyright (C) 1998-2008 Novell/SUSE
|
|
* Copyright 2009-2017 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"
|
|
|
|
/**
|
|
* audit_ptrace_mask - convert mask to permission string
|
|
* @buffer: buffer to write string to (NOT NULL)
|
|
* @mask: permission mask to convert
|
|
*/
|
|
static void audit_ptrace_mask(struct audit_buffer *ab, u32 mask)
|
|
{
|
|
switch (mask) {
|
|
case MAY_READ:
|
|
audit_log_string(ab, "read");
|
|
break;
|
|
case MAY_WRITE:
|
|
audit_log_string(ab, "trace");
|
|
break;
|
|
case AA_MAY_BE_READ:
|
|
audit_log_string(ab, "readby");
|
|
break;
|
|
case AA_MAY_BE_TRACED:
|
|
audit_log_string(ab, "tracedby");
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* call back to audit ptrace fields */
|
|
static void audit_ptrace_cb(struct audit_buffer *ab, void *va)
|
|
{
|
|
struct common_audit_data *sa = va;
|
|
|
|
if (aad(sa)->request & AA_PTRACE_PERM_MASK) {
|
|
audit_log_format(ab, " requested_mask=");
|
|
audit_ptrace_mask(ab, aad(sa)->request);
|
|
|
|
if (aad(sa)->denied & AA_PTRACE_PERM_MASK) {
|
|
audit_log_format(ab, " denied_mask=");
|
|
audit_ptrace_mask(ab, aad(sa)->denied);
|
|
}
|
|
}
|
|
audit_log_format(ab, " peer=");
|
|
aa_label_xaudit(ab, labels_ns(aad(sa)->label), aad(sa)->peer,
|
|
FLAGS_NONE, GFP_ATOMIC);
|
|
}
|
|
|
|
/* TODO: conditionals */
|
|
static int profile_ptrace_perm(struct aa_profile *profile,
|
|
struct aa_profile *peer, u32 request,
|
|
struct common_audit_data *sa)
|
|
{
|
|
struct aa_perms perms = { };
|
|
|
|
/* need because of peer in cross check */
|
|
if (profile_unconfined(profile) ||
|
|
!PROFILE_MEDIATES(profile, AA_CLASS_PTRACE))
|
|
return 0;
|
|
|
|
aad(sa)->peer = &peer->label;
|
|
aa_profile_match_label(profile, &peer->label, AA_CLASS_PTRACE, request,
|
|
&perms);
|
|
aa_apply_modes_to_perms(profile, &perms);
|
|
return aa_check_perms(profile, &perms, request, sa, audit_ptrace_cb);
|
|
}
|
|
|
|
static int cross_ptrace_perm(struct aa_profile *tracer,
|
|
struct aa_profile *tracee, u32 request,
|
|
struct common_audit_data *sa)
|
|
{
|
|
if (PROFILE_MEDIATES(tracer, AA_CLASS_PTRACE))
|
|
return xcheck(profile_ptrace_perm(tracer, tracee, request, sa),
|
|
profile_ptrace_perm(tracee, tracer,
|
|
request << PTRACE_PERM_SHIFT,
|
|
sa));
|
|
/* policy uses the old style capability check for ptrace */
|
|
if (profile_unconfined(tracer) || tracer == tracee)
|
|
return 0;
|
|
|
|
aad(sa)->label = &tracer->label;
|
|
aad(sa)->peer = &tracee->label;
|
|
aad(sa)->request = 0;
|
|
aad(sa)->error = aa_capable(&tracer->label, CAP_SYS_PTRACE, 1);
|
|
|
|
return aa_audit(AUDIT_APPARMOR_AUTO, tracer, sa, audit_ptrace_cb);
|
|
}
|
|
|
|
/**
|
|
* aa_may_ptrace - test if tracer task can trace the tracee
|
|
* @tracer: label of the task doing the tracing (NOT NULL)
|
|
* @tracee: task label to be traced
|
|
* @request: permission request
|
|
*
|
|
* Returns: %0 else error code if permission denied or error
|
|
*/
|
|
int aa_may_ptrace(struct aa_label *tracer, struct aa_label *tracee,
|
|
u32 request)
|
|
{
|
|
DEFINE_AUDIT_DATA(sa, LSM_AUDIT_DATA_NONE, OP_PTRACE);
|
|
|
|
return xcheck_labels_profiles(tracer, tracee, cross_ptrace_perm,
|
|
request, &sa);
|
|
}
|
|
|
|
|