blob: 3968422936d49e967b99aae53c6ca85cdc147290 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
|
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <Kernel/Process.h>
namespace Kernel {
ErrorOr<FlatPtr> Process::sys$seteuid(UserID new_euid)
{
VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
TRY(require_promise(Pledge::id));
if (new_euid == (uid_t)-1)
return EINVAL;
if (new_euid != uid() && new_euid != suid() && !is_superuser())
return EPERM;
if (euid() != new_euid)
set_dumpable(false);
ProtectedDataMutationScope scope { *this };
m_protected_values.euid = new_euid;
return 0;
}
ErrorOr<FlatPtr> Process::sys$setegid(GroupID new_egid)
{
VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
TRY(require_promise(Pledge::id));
if (new_egid == (uid_t)-1)
return EINVAL;
if (new_egid != gid() && new_egid != sgid() && !is_superuser())
return EPERM;
if (egid() != new_egid)
set_dumpable(false);
ProtectedDataMutationScope scope { *this };
m_protected_values.egid = new_egid;
return 0;
}
ErrorOr<FlatPtr> Process::sys$setuid(UserID new_uid)
{
VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
TRY(require_promise(Pledge::id));
if (new_uid == (uid_t)-1)
return EINVAL;
if (new_uid != uid() && new_uid != euid() && !is_superuser())
return EPERM;
if (euid() != new_uid)
set_dumpable(false);
ProtectedDataMutationScope scope { *this };
m_protected_values.uid = new_uid;
m_protected_values.euid = new_uid;
m_protected_values.suid = new_uid;
return 0;
}
ErrorOr<FlatPtr> Process::sys$setgid(GroupID new_gid)
{
VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
TRY(require_promise(Pledge::id));
if (new_gid == (uid_t)-1)
return EINVAL;
if (new_gid != gid() && new_gid != egid() && !is_superuser())
return EPERM;
if (egid() != new_gid)
set_dumpable(false);
ProtectedDataMutationScope scope { *this };
m_protected_values.gid = new_gid;
m_protected_values.egid = new_gid;
m_protected_values.sgid = new_gid;
return 0;
}
ErrorOr<FlatPtr> Process::sys$setreuid(UserID new_ruid, UserID new_euid)
{
VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
TRY(require_promise(Pledge::id));
if (new_ruid == (uid_t)-1)
new_ruid = uid();
if (new_euid == (uid_t)-1)
new_euid = euid();
auto ok = [this](UserID id) { return id == uid() || id == euid() || id == suid(); };
if (!ok(new_ruid) || !ok(new_euid))
return EPERM;
if (new_ruid < (uid_t)-1 || new_euid < (uid_t)-1)
return EINVAL;
if (euid() != new_euid)
set_dumpable(false);
ProtectedDataMutationScope scope { *this };
m_protected_values.uid = new_ruid;
m_protected_values.euid = new_euid;
return 0;
}
ErrorOr<FlatPtr> Process::sys$setresuid(UserID new_ruid, UserID new_euid, UserID new_suid)
{
VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
TRY(require_promise(Pledge::id));
if (new_ruid == (uid_t)-1)
new_ruid = uid();
if (new_euid == (uid_t)-1)
new_euid = euid();
if (new_suid == (uid_t)-1)
new_suid = suid();
auto ok = [this](UserID id) { return id == uid() || id == euid() || id == suid(); };
if ((!ok(new_ruid) || !ok(new_euid) || !ok(new_suid)) && !is_superuser())
return EPERM;
if (euid() != new_euid)
set_dumpable(false);
ProtectedDataMutationScope scope { *this };
m_protected_values.uid = new_ruid;
m_protected_values.euid = new_euid;
m_protected_values.suid = new_suid;
return 0;
}
ErrorOr<FlatPtr> Process::sys$setresgid(GroupID new_rgid, GroupID new_egid, GroupID new_sgid)
{
VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
TRY(require_promise(Pledge::id));
if (new_rgid == (gid_t)-1)
new_rgid = gid();
if (new_egid == (gid_t)-1)
new_egid = egid();
if (new_sgid == (gid_t)-1)
new_sgid = sgid();
auto ok = [this](GroupID id) { return id == gid() || id == egid() || id == sgid(); };
if ((!ok(new_rgid) || !ok(new_egid) || !ok(new_sgid)) && !is_superuser())
return EPERM;
if (egid() != new_egid)
set_dumpable(false);
ProtectedDataMutationScope scope { *this };
m_protected_values.gid = new_rgid;
m_protected_values.egid = new_egid;
m_protected_values.sgid = new_sgid;
return 0;
}
ErrorOr<FlatPtr> Process::sys$setgroups(size_t count, Userspace<const gid_t*> user_gids)
{
VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
TRY(require_promise(Pledge::id));
if (!is_superuser())
return EPERM;
if (!count) {
ProtectedDataMutationScope scope { *this };
m_protected_values.extra_gids.clear();
return 0;
}
Vector<gid_t> new_extra_gids;
TRY(new_extra_gids.try_resize(count));
TRY(copy_n_from_user(new_extra_gids.data(), user_gids, count));
HashTable<gid_t> unique_extra_gids;
for (auto& extra_gid : new_extra_gids) {
if (extra_gid != gid())
unique_extra_gids.set(extra_gid);
}
ProtectedDataMutationScope scope { *this };
TRY(m_protected_values.extra_gids.try_resize(unique_extra_gids.size()));
size_t i = 0;
for (auto& extra_gid : unique_extra_gids) {
if (extra_gid == gid())
continue;
m_protected_values.extra_gids[i++] = extra_gid;
}
return 0;
}
}
|
