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1 | // SPDX-License-Identifier: GPL-2.0 | |
2 | /* | |
3 | * Wrapper functions for 16bit uid back compatibility. All nicely tied | |
4 | * together in the faint hope we can take the out in five years time. | |
5 | */ | |
6 | ||
7 | #include <linux/mm.h> | |
8 | #include <linux/mman.h> | |
9 | #include <linux/notifier.h> | |
10 | #include <linux/reboot.h> | |
11 | #include <linux/prctl.h> | |
12 | #include <linux/capability.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/highuid.h> | |
15 | #include <linux/security.h> | |
16 | #include <linux/cred.h> | |
17 | #include <linux/syscalls.h> | |
18 | ||
19 | #include <linux/uaccess.h> | |
20 | ||
21 | SYSCALL_DEFINE3(chown16, const char __user *, filename, old_uid_t, user, old_gid_t, group) | |
22 | { | |
23 | return sys_chown(filename, low2highuid(user), low2highgid(group)); | |
24 | } | |
25 | ||
26 | SYSCALL_DEFINE3(lchown16, const char __user *, filename, old_uid_t, user, old_gid_t, group) | |
27 | { | |
28 | return sys_lchown(filename, low2highuid(user), low2highgid(group)); | |
29 | } | |
30 | ||
31 | SYSCALL_DEFINE3(fchown16, unsigned int, fd, old_uid_t, user, old_gid_t, group) | |
32 | { | |
33 | return sys_fchown(fd, low2highuid(user), low2highgid(group)); | |
34 | } | |
35 | ||
36 | SYSCALL_DEFINE2(setregid16, old_gid_t, rgid, old_gid_t, egid) | |
37 | { | |
38 | return sys_setregid(low2highgid(rgid), low2highgid(egid)); | |
39 | } | |
40 | ||
41 | SYSCALL_DEFINE1(setgid16, old_gid_t, gid) | |
42 | { | |
43 | return sys_setgid(low2highgid(gid)); | |
44 | } | |
45 | ||
46 | SYSCALL_DEFINE2(setreuid16, old_uid_t, ruid, old_uid_t, euid) | |
47 | { | |
48 | return sys_setreuid(low2highuid(ruid), low2highuid(euid)); | |
49 | } | |
50 | ||
51 | SYSCALL_DEFINE1(setuid16, old_uid_t, uid) | |
52 | { | |
53 | return sys_setuid(low2highuid(uid)); | |
54 | } | |
55 | ||
56 | SYSCALL_DEFINE3(setresuid16, old_uid_t, ruid, old_uid_t, euid, old_uid_t, suid) | |
57 | { | |
58 | return sys_setresuid(low2highuid(ruid), low2highuid(euid), | |
59 | low2highuid(suid)); | |
60 | } | |
61 | ||
62 | SYSCALL_DEFINE3(getresuid16, old_uid_t __user *, ruidp, old_uid_t __user *, euidp, old_uid_t __user *, suidp) | |
63 | { | |
64 | const struct cred *cred = current_cred(); | |
65 | int retval; | |
66 | old_uid_t ruid, euid, suid; | |
67 | ||
68 | ruid = high2lowuid(from_kuid_munged(cred->user_ns, cred->uid)); | |
69 | euid = high2lowuid(from_kuid_munged(cred->user_ns, cred->euid)); | |
70 | suid = high2lowuid(from_kuid_munged(cred->user_ns, cred->suid)); | |
71 | ||
72 | if (!(retval = put_user(ruid, ruidp)) && | |
73 | !(retval = put_user(euid, euidp))) | |
74 | retval = put_user(suid, suidp); | |
75 | ||
76 | return retval; | |
77 | } | |
78 | ||
79 | SYSCALL_DEFINE3(setresgid16, old_gid_t, rgid, old_gid_t, egid, old_gid_t, sgid) | |
80 | { | |
81 | return sys_setresgid(low2highgid(rgid), low2highgid(egid), | |
82 | low2highgid(sgid)); | |
83 | } | |
84 | ||
85 | ||
86 | SYSCALL_DEFINE3(getresgid16, old_gid_t __user *, rgidp, old_gid_t __user *, egidp, old_gid_t __user *, sgidp) | |
87 | { | |
88 | const struct cred *cred = current_cred(); | |
89 | int retval; | |
90 | old_gid_t rgid, egid, sgid; | |
91 | ||
92 | rgid = high2lowgid(from_kgid_munged(cred->user_ns, cred->gid)); | |
93 | egid = high2lowgid(from_kgid_munged(cred->user_ns, cred->egid)); | |
94 | sgid = high2lowgid(from_kgid_munged(cred->user_ns, cred->sgid)); | |
95 | ||
96 | if (!(retval = put_user(rgid, rgidp)) && | |
97 | !(retval = put_user(egid, egidp))) | |
98 | retval = put_user(sgid, sgidp); | |
99 | ||
100 | return retval; | |
101 | } | |
102 | ||
103 | SYSCALL_DEFINE1(setfsuid16, old_uid_t, uid) | |
104 | { | |
105 | return sys_setfsuid(low2highuid(uid)); | |
106 | } | |
107 | ||
108 | SYSCALL_DEFINE1(setfsgid16, old_gid_t, gid) | |
109 | { | |
110 | return sys_setfsgid(low2highgid(gid)); | |
111 | } | |
112 | ||
113 | static int groups16_to_user(old_gid_t __user *grouplist, | |
114 | struct group_info *group_info) | |
115 | { | |
116 | struct user_namespace *user_ns = current_user_ns(); | |
117 | int i; | |
118 | old_gid_t group; | |
119 | kgid_t kgid; | |
120 | ||
121 | for (i = 0; i < group_info->ngroups; i++) { | |
122 | kgid = group_info->gid[i]; | |
123 | group = high2lowgid(from_kgid_munged(user_ns, kgid)); | |
124 | if (put_user(group, grouplist+i)) | |
125 | return -EFAULT; | |
126 | } | |
127 | ||
128 | return 0; | |
129 | } | |
130 | ||
131 | static int groups16_from_user(struct group_info *group_info, | |
132 | old_gid_t __user *grouplist) | |
133 | { | |
134 | struct user_namespace *user_ns = current_user_ns(); | |
135 | int i; | |
136 | old_gid_t group; | |
137 | kgid_t kgid; | |
138 | ||
139 | for (i = 0; i < group_info->ngroups; i++) { | |
140 | if (get_user(group, grouplist+i)) | |
141 | return -EFAULT; | |
142 | ||
143 | kgid = make_kgid(user_ns, low2highgid(group)); | |
144 | if (!gid_valid(kgid)) | |
145 | return -EINVAL; | |
146 | ||
147 | group_info->gid[i] = kgid; | |
148 | } | |
149 | ||
150 | return 0; | |
151 | } | |
152 | ||
153 | SYSCALL_DEFINE2(getgroups16, int, gidsetsize, old_gid_t __user *, grouplist) | |
154 | { | |
155 | const struct cred *cred = current_cred(); | |
156 | int i; | |
157 | ||
158 | if (gidsetsize < 0) | |
159 | return -EINVAL; | |
160 | ||
161 | i = cred->group_info->ngroups; | |
162 | if (gidsetsize) { | |
163 | if (i > gidsetsize) { | |
164 | i = -EINVAL; | |
165 | goto out; | |
166 | } | |
167 | if (groups16_to_user(grouplist, cred->group_info)) { | |
168 | i = -EFAULT; | |
169 | goto out; | |
170 | } | |
171 | } | |
172 | out: | |
173 | return i; | |
174 | } | |
175 | ||
176 | SYSCALL_DEFINE2(setgroups16, int, gidsetsize, old_gid_t __user *, grouplist) | |
177 | { | |
178 | struct group_info *group_info; | |
179 | int retval; | |
180 | ||
181 | if (!may_setgroups()) | |
182 | return -EPERM; | |
183 | if ((unsigned)gidsetsize > NGROUPS_MAX) | |
184 | return -EINVAL; | |
185 | ||
186 | group_info = groups_alloc(gidsetsize); | |
187 | if (!group_info) | |
188 | return -ENOMEM; | |
189 | retval = groups16_from_user(group_info, grouplist); | |
190 | if (retval) { | |
191 | put_group_info(group_info); | |
192 | return retval; | |
193 | } | |
194 | ||
195 | groups_sort(group_info); | |
196 | retval = set_current_groups(group_info); | |
197 | put_group_info(group_info); | |
198 | ||
199 | return retval; | |
200 | } | |
201 | ||
202 | SYSCALL_DEFINE0(getuid16) | |
203 | { | |
204 | return high2lowuid(from_kuid_munged(current_user_ns(), current_uid())); | |
205 | } | |
206 | ||
207 | SYSCALL_DEFINE0(geteuid16) | |
208 | { | |
209 | return high2lowuid(from_kuid_munged(current_user_ns(), current_euid())); | |
210 | } | |
211 | ||
212 | SYSCALL_DEFINE0(getgid16) | |
213 | { | |
214 | return high2lowgid(from_kgid_munged(current_user_ns(), current_gid())); | |
215 | } | |
216 | ||
217 | SYSCALL_DEFINE0(getegid16) | |
218 | { | |
219 | return high2lowgid(from_kgid_munged(current_user_ns(), current_egid())); | |
220 | } |