2 * AppArmor security module
4 * This file contains AppArmor resource mediation and attachment
6 * Copyright (C) 1998-2008 Novell/SUSE
7 * Copyright 2009-2010 Canonical Ltd.
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation, version 2 of the
15 #include <linux/audit.h>
17 #include "include/audit.h"
18 #include "include/resource.h"
19 #include "include/policy.h"
22 * Table of rlimit names: we generate it from resource.h.
24 #include "rlim_names.h"
26 struct aa_fs_entry aa_fs_entry_rlimit
[] = {
27 AA_FS_FILE_STRING("mask", AA_FS_RLIMIT_MASK
),
31 /* audit callback for resource specific fields */
32 static void audit_cb(struct audit_buffer
*ab
, void *va
)
34 struct common_audit_data
*sa
= va
;
36 audit_log_format(ab
, " rlimit=%s value=%lu",
37 rlim_names
[sa
->aad
.rlim
.rlim
], sa
->aad
.rlim
.max
);
41 * audit_resource - audit setting resource limit
42 * @profile: profile being enforced (NOT NULL)
43 * @resoure: rlimit being auditing
44 * @value: value being set
47 * Returns: 0 or sa->error else other error code on failure
49 static int audit_resource(struct aa_profile
*profile
, unsigned int resource
,
50 unsigned long value
, int error
)
52 struct common_audit_data sa
;
54 COMMON_AUDIT_DATA_INIT(&sa
, NONE
);
55 sa
.aad
.op
= OP_SETRLIMIT
,
56 sa
.aad
.rlim
.rlim
= resource
;
57 sa
.aad
.rlim
.max
= value
;
59 return aa_audit(AUDIT_APPARMOR_AUTO
, profile
, GFP_KERNEL
, &sa
,
64 * aa_map_resouce - map compiled policy resource to internal #
65 * @resource: flattened policy resource number
67 * Returns: resource # for the current architecture.
69 * rlimit resource can vary based on architecture, map the compiled policy
70 * resource # to the internal representation for the architecture.
72 int aa_map_resource(int resource
)
74 return rlim_map
[resource
];
78 * aa_task_setrlimit - test permission to set an rlimit
79 * @profile - profile confining the task (NOT NULL)
80 * @task - task the resource is being set on
81 * @resource - the resource being set
82 * @new_rlim - the new resource limit (NOT NULL)
84 * Control raising the processes hard limit.
86 * Returns: 0 or error code if setting resource failed
88 int aa_task_setrlimit(struct aa_profile
*profile
, struct task_struct
*task
,
89 unsigned int resource
, struct rlimit
*new_rlim
)
93 /* TODO: extend resource control to handle other (non current)
94 * processes. AppArmor rules currently have the implicit assumption
95 * that the task is setting the resource of the current process
97 if ((task
!= current
->group_leader
) ||
98 (profile
->rlimits
.mask
& (1 << resource
) &&
99 new_rlim
->rlim_max
> profile
->rlimits
.limits
[resource
].rlim_max
))
102 return audit_resource(profile
, resource
, new_rlim
->rlim_max
, error
);
106 * __aa_transition_rlimits - apply new profile rlimits
107 * @old: old profile on task (NOT NULL)
108 * @new: new profile with rlimits to apply (NOT NULL)
110 void __aa_transition_rlimits(struct aa_profile
*old
, struct aa_profile
*new)
112 unsigned int mask
= 0;
113 struct rlimit
*rlim
, *initrlim
;
116 /* for any rlimits the profile controlled reset the soft limit
117 * to the less of the tasks hard limit and the init tasks soft limit
119 if (old
->rlimits
.mask
) {
120 for (i
= 0, mask
= 1; i
< RLIM_NLIMITS
; i
++, mask
<<= 1) {
121 if (old
->rlimits
.mask
& mask
) {
122 rlim
= current
->signal
->rlim
+ i
;
123 initrlim
= init_task
.signal
->rlim
+ i
;
124 rlim
->rlim_cur
= min(rlim
->rlim_max
,
130 /* set any new hard limits as dictated by the new profile */
131 if (!new->rlimits
.mask
)
133 for (i
= 0, mask
= 1; i
< RLIM_NLIMITS
; i
++, mask
<<= 1) {
134 if (!(new->rlimits
.mask
& mask
))
137 rlim
= current
->signal
->rlim
+ i
;
138 rlim
->rlim_max
= min(rlim
->rlim_max
,
139 new->rlimits
.limits
[i
].rlim_max
);
140 /* soft limit should not exceed hard limit */
141 rlim
->rlim_cur
= min(rlim
->rlim_cur
, rlim
->rlim_max
);