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[linux-2.6.git] / kernel / uid16.c
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/utsname.h>
8 #include <linux/mman.h>
9 #include <linux/smp_lock.h>
10 #include <linux/notifier.h>
11 #include <linux/reboot.h>
12 #include <linux/prctl.h>
13 #include <linux/init.h>
14 #include <linux/highuid.h>
15 #include <linux/security.h>
16 #include <linux/syscalls.h>
17
18 #include <asm/uaccess.h>
19
20 asmlinkage long sys_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 asmlinkage long sys_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 asmlinkage long sys_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 asmlinkage long sys_setregid16(old_gid_t rgid, old_gid_t egid)
36 {
37         return sys_setregid(low2highgid(rgid), low2highgid(egid));
38 }
39
40 asmlinkage long sys_setgid16(old_gid_t gid)
41 {
42         return sys_setgid(low2highgid(gid));
43 }
44
45 asmlinkage long sys_setreuid16(old_uid_t ruid, old_uid_t euid)
46 {
47         return sys_setreuid(low2highuid(ruid), low2highuid(euid));
48 }
49
50 asmlinkage long sys_setuid16(old_uid_t uid)
51 {
52         return sys_setuid(low2highuid(uid));
53 }
54
55 asmlinkage long sys_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 asmlinkage long sys_getresuid16(old_uid_t __user *ruid, old_uid_t __user *euid, old_uid_t __user *suid)
62 {
63         int retval;
64
65         if (!(retval = put_user(high2lowuid(current->uid), ruid)) &&
66             !(retval = put_user(high2lowuid(current->euid), euid)))
67                 retval = put_user(high2lowuid(current->suid), suid);
68
69         return retval;
70 }
71
72 asmlinkage long sys_setresgid16(old_gid_t rgid, old_gid_t egid, old_gid_t sgid)
73 {
74         return sys_setresgid(low2highgid(rgid), low2highgid(egid),
75                 low2highgid(sgid));
76 }
77
78 asmlinkage long sys_getresgid16(old_gid_t __user *rgid, old_gid_t __user *egid, old_gid_t __user *sgid)
79 {
80         int retval;
81
82         if (!(retval = put_user(high2lowgid(current->gid), rgid)) &&
83             !(retval = put_user(high2lowgid(current->egid), egid)))
84                 retval = put_user(high2lowgid(current->sgid), sgid);
85
86         return retval;
87 }
88
89 asmlinkage long sys_setfsuid16(old_uid_t uid)
90 {
91         return sys_setfsuid(low2highuid(uid));
92 }
93
94 asmlinkage long sys_setfsgid16(old_gid_t gid)
95 {
96         return sys_setfsgid(low2highgid(gid));
97 }
98
99 static int groups16_to_user(old_gid_t __user *grouplist,
100     struct group_info *group_info)
101 {
102         int i;
103         old_gid_t group;
104
105         for (i = 0; i < group_info->ngroups; i++) {
106                 group = high2lowgid(GROUP_AT(group_info, i));
107                 if (put_user(group, grouplist+i))
108                         return -EFAULT;
109         }
110
111         return 0;
112 }
113
114 static int groups16_from_user(struct group_info *group_info,
115     old_gid_t __user *grouplist)
116 {
117         int i;
118         old_gid_t group;
119
120         for (i = 0; i < group_info->ngroups; i++) {
121                 if (get_user(group, grouplist+i))
122                         return  -EFAULT;
123                 GROUP_AT(group_info, i) = low2highgid(group);
124         }
125
126         return 0;
127 }
128
129 asmlinkage long sys_getgroups16(int gidsetsize, old_gid_t __user *grouplist)
130 {
131         int i = 0;
132
133         if (gidsetsize < 0)
134                 return -EINVAL;
135
136         get_group_info(current->group_info);
137         i = current->group_info->ngroups;
138         if (gidsetsize) {
139                 if (i > gidsetsize) {
140                         i = -EINVAL;
141                         goto out;
142                 }
143                 if (groups16_to_user(grouplist, current->group_info)) {
144                         i = -EFAULT;
145                         goto out;
146                 }
147         }
148 out:
149         put_group_info(current->group_info);
150         return i;
151 }
152
153 asmlinkage long sys_setgroups16(int gidsetsize, old_gid_t __user *grouplist)
154 {
155         struct group_info *group_info;
156         int retval;
157
158         if (!capable(CAP_SETGID))
159                 return -EPERM;
160         if ((unsigned)gidsetsize > NGROUPS_MAX)
161                 return -EINVAL;
162
163         group_info = groups_alloc(gidsetsize);
164         if (!group_info)
165                 return -ENOMEM;
166         retval = groups16_from_user(group_info, grouplist);
167         if (retval) {
168                 put_group_info(group_info);
169                 return retval;
170         }
171
172         retval = set_current_groups(group_info);
173         put_group_info(group_info);
174
175         return retval;
176 }
177
178 asmlinkage long sys_getuid16(void)
179 {
180         return high2lowuid(current->uid);
181 }
182
183 asmlinkage long sys_geteuid16(void)
184 {
185         return high2lowuid(current->euid);
186 }
187
188 asmlinkage long sys_getgid16(void)
189 {
190         return high2lowgid(current->gid);
191 }
192
193 asmlinkage long sys_getegid16(void)
194 {
195         return high2lowgid(current->egid);
196 }