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