1 /*
2 * Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
3 * Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without modification,
6 * are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this list of
9 * conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice, this list
12 * of conditions and the following disclaimer in the documentation and/or other materials
13 * provided with the distribution.
14 *
15 * 3. Neither the name of the copyright holder nor the names of its contributors may be used
16 * to endorse or promote products derived from this software without specific prior written
17 * permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
21 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
26 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
27 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
28 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
29 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include "capability_type.h"
33 #include "los_memory.h"
34 #include "los_process_pri.h"
35 #include "user_copy.h"
36 #include "los_printf.h"
37
38 #define CAPABILITY_INIT_STAT 0xffffffff
39 #define CAPABILITY_GET_CAP_MASK(x) (1 << ((x) & 31))
40 #define CAPABILITY_MAX 31
41 #define VALID_CAPS(a, b) (((a) & (~(b))) != 0)
42
IsCapPermit(UINT32 capIndex)43 BOOL IsCapPermit(UINT32 capIndex)
44 {
45 UINT32 capability = OsCurrProcessGet()->capability;
46 if (capIndex > CAPABILITY_MAX || capIndex < 0) {
47 PRINTK("%s,%d, get invalid capIndex %u\n", __FUNCTION__, __LINE__, capIndex);
48 return FALSE;
49 }
50
51 return (capability & (CAPABILITY_GET_CAP_MASK(capIndex)));
52 }
53
OsInitCapability(LosProcessCB * processCB)54 VOID OsInitCapability(LosProcessCB *processCB)
55 {
56 processCB->capability = CAPABILITY_INIT_STAT;
57 }
58
OsCopyCapability(LosProcessCB * from,LosProcessCB * to)59 VOID OsCopyCapability(LosProcessCB *from, LosProcessCB *to)
60 {
61 UINT32 intSave;
62
63 SCHEDULER_LOCK(intSave);
64 to->capability = from->capability;
65 SCHEDULER_UNLOCK(intSave);
66 }
67
SysCapSet(UINT32 caps)68 UINT32 SysCapSet(UINT32 caps)
69 {
70 UINT32 intSave;
71
72 SCHEDULER_LOCK(intSave);
73 if (!IsCapPermit(CAP_CAPSET)) {
74 SCHEDULER_UNLOCK(intSave);
75 return -EPERM;
76 }
77
78 if (VALID_CAPS(caps, OsCurrProcessGet()->capability)) {
79 SCHEDULER_UNLOCK(intSave);
80 return -EPERM;
81 }
82
83 OsCurrProcessGet()->capability = caps;
84 SCHEDULER_UNLOCK(intSave);
85 return LOS_OK;
86 }
87
SysCapGet(pid_t pid,UINT32 * caps)88 UINT32 SysCapGet(pid_t pid, UINT32 *caps)
89 {
90 UINT32 intSave;
91 UINT32 kCaps;
92 LosProcessCB *processCB = NULL;
93
94 if ((OS_PID_CHECK_INVALID((UINT32)pid))) {
95 return -EINVAL;
96 }
97
98 if (pid == 0) {
99 processCB = OsCurrProcessGet();
100 } else {
101 processCB = OS_PCB_FROM_PID(pid);
102 }
103
104 SCHEDULER_LOCK(intSave);
105 if (OsProcessIsInactive(processCB)) {
106 SCHEDULER_UNLOCK(intSave);
107 return -ESRCH;
108 }
109
110 kCaps = processCB->capability;
111 SCHEDULER_UNLOCK(intSave);
112
113 if (LOS_ArchCopyToUser(caps, &kCaps, sizeof(UINT32)) != LOS_OK) {
114 return -EFAULT;
115 }
116
117 return LOS_OK;
118 }
119