[PATCH] slab: remove kmem_cache_t
[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/capability.h>
14 #include <linux/init.h>
15 #include <linux/highuid.h>
16 #include <linux/security.h>
17 #include <linux/syscalls.h>
18
19 #include <asm/uaccess.h>
20
21 asmlinkage long sys_chown16(const char __user * filename, old_uid_t user, old_gid_t group)
22 {
23         long ret = sys_chown(filename, low2highuid(user), low2highgid(group));
24         /* avoid REGPARM breakage on x86: */
25         prevent_tail_call(ret);
26         return ret;
27 }
28
29 asmlinkage long sys_lchown16(const char __user * filename, old_uid_t user, old_gid_t group)
30 {
31         long ret = sys_lchown(filename, low2highuid(user), low2highgid(group));
32         /* avoid REGPARM breakage on x86: */
33         prevent_tail_call(ret);
34         return ret;
35 }
36
37 asmlinkage long sys_fchown16(unsigned int fd, old_uid_t user, old_gid_t group)
38 {
39         long ret = sys_fchown(fd, low2highuid(user), low2highgid(group));
40         /* avoid REGPARM breakage on x86: */
41         prevent_tail_call(ret);
42         return ret;
43 }
44
45 asmlinkage long sys_setregid16(old_gid_t rgid, old_gid_t egid)
46 {
47         long ret = sys_setregid(low2highgid(rgid), low2highgid(egid));
48         /* avoid REGPARM breakage on x86: */
49         prevent_tail_call(ret);
50         return ret;
51 }
52
53 asmlinkage long sys_setgid16(old_gid_t gid)
54 {
55         long ret = sys_setgid(low2highgid(gid));
56         /* avoid REGPARM breakage on x86: */
57         prevent_tail_call(ret);
58         return ret;
59 }
60
61 asmlinkage long sys_setreuid16(old_uid_t ruid, old_uid_t euid)
62 {
63         long ret = sys_setreuid(low2highuid(ruid), low2highuid(euid));
64         /* avoid REGPARM breakage on x86: */
65         prevent_tail_call(ret);
66         return ret;
67 }
68
69 asmlinkage long sys_setuid16(old_uid_t uid)
70 {
71         long ret = sys_setuid(low2highuid(uid));
72         /* avoid REGPARM breakage on x86: */
73         prevent_tail_call(ret);
74         return ret;
75 }
76
77 asmlinkage long sys_setresuid16(old_uid_t ruid, old_uid_t euid, old_uid_t suid)
78 {
79         long ret = sys_setresuid(low2highuid(ruid), low2highuid(euid),
80                                  low2highuid(suid));
81         /* avoid REGPARM breakage on x86: */
82         prevent_tail_call(ret);
83         return ret;
84 }
85
86 asmlinkage long sys_getresuid16(old_uid_t __user *ruid, old_uid_t __user *euid, old_uid_t __user *suid)
87 {
88         int retval;
89
90         if (!(retval = put_user(high2lowuid(current->uid), ruid)) &&
91             !(retval = put_user(high2lowuid(current->euid), euid)))
92                 retval = put_user(high2lowuid(current->suid), suid);
93
94         return retval;
95 }
96
97 asmlinkage long sys_setresgid16(old_gid_t rgid, old_gid_t egid, old_gid_t sgid)
98 {
99         long ret = sys_setresgid(low2highgid(rgid), low2highgid(egid),
100                                  low2highgid(sgid));
101         /* avoid REGPARM breakage on x86: */
102         prevent_tail_call(ret);
103         return ret;
104 }
105
106 asmlinkage long sys_getresgid16(old_gid_t __user *rgid, old_gid_t __user *egid, old_gid_t __user *sgid)
107 {
108         int retval;
109
110         if (!(retval = put_user(high2lowgid(current->gid), rgid)) &&
111             !(retval = put_user(high2lowgid(current->egid), egid)))
112                 retval = put_user(high2lowgid(current->sgid), sgid);
113
114         return retval;
115 }
116
117 asmlinkage long sys_setfsuid16(old_uid_t uid)
118 {
119         long ret = sys_setfsuid(low2highuid(uid));
120         /* avoid REGPARM breakage on x86: */
121         prevent_tail_call(ret);
122         return ret;
123 }
124
125 asmlinkage long sys_setfsgid16(old_gid_t gid)
126 {
127         long ret = sys_setfsgid(low2highgid(gid));
128         /* avoid REGPARM breakage on x86: */
129         prevent_tail_call(ret);
130         return ret;
131 }
132
133 static int groups16_to_user(old_gid_t __user *grouplist,
134     struct group_info *group_info)
135 {
136         int i;
137         old_gid_t group;
138
139         for (i = 0; i < group_info->ngroups; i++) {
140                 group = high2lowgid(GROUP_AT(group_info, i));
141                 if (put_user(group, grouplist+i))
142                         return -EFAULT;
143         }
144
145         return 0;
146 }
147
148 static int groups16_from_user(struct group_info *group_info,
149     old_gid_t __user *grouplist)
150 {
151         int i;
152         old_gid_t group;
153
154         for (i = 0; i < group_info->ngroups; i++) {
155                 if (get_user(group, grouplist+i))
156                         return  -EFAULT;
157                 GROUP_AT(group_info, i) = low2highgid(group);
158         }
159
160         return 0;
161 }
162
163 asmlinkage long sys_getgroups16(int gidsetsize, old_gid_t __user *grouplist)
164 {
165         int i = 0;
166
167         if (gidsetsize < 0)
168                 return -EINVAL;
169
170         get_group_info(current->group_info);
171         i = current->group_info->ngroups;
172         if (gidsetsize) {
173                 if (i > gidsetsize) {
174                         i = -EINVAL;
175                         goto out;
176                 }
177                 if (groups16_to_user(grouplist, current->group_info)) {
178                         i = -EFAULT;
179                         goto out;
180                 }
181         }
182 out:
183         put_group_info(current->group_info);
184         return i;
185 }
186
187 asmlinkage long sys_setgroups16(int gidsetsize, old_gid_t __user *grouplist)
188 {
189         struct group_info *group_info;
190         int retval;
191
192         if (!capable(CAP_SETGID))
193                 return -EPERM;
194         if ((unsigned)gidsetsize > NGROUPS_MAX)
195                 return -EINVAL;
196
197         group_info = groups_alloc(gidsetsize);
198         if (!group_info)
199                 return -ENOMEM;
200         retval = groups16_from_user(group_info, grouplist);
201         if (retval) {
202                 put_group_info(group_info);
203                 return retval;
204         }
205
206         retval = set_current_groups(group_info);
207         put_group_info(group_info);
208
209         return retval;
210 }
211
212 asmlinkage long sys_getuid16(void)
213 {
214         return high2lowuid(current->uid);
215 }
216
217 asmlinkage long sys_geteuid16(void)
218 {
219         return high2lowuid(current->euid);
220 }
221
222 asmlinkage long sys_getgid16(void)
223 {
224         return high2lowgid(current->gid);
225 }
226
227 asmlinkage long sys_getegid16(void)
228 {
229         return high2lowgid(current->egid);
230 }