projects/linux·blob v2.6.21 · refs

230 lines · 5.1 KiB

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
21asmlinkage 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
29asmlinkage 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
37asmlinkage 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
45asmlinkage 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
53asmlinkage 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
61asmlinkage 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
69asmlinkage 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
77asmlinkage 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
86asmlinkage 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
97asmlinkage 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
106asmlinkage 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
117asmlinkage 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
125asmlinkage 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
133static 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
148static 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
163asmlinkage 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 }
182out:
183 put_group_info(current->group_info);
184 return i;
185}
186
187asmlinkage 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
212asmlinkage long sys_getuid16(void)
213{
214 return high2lowuid(current->uid);
215}
216
217asmlinkage long sys_geteuid16(void)
218{
219 return high2lowuid(current->euid);
220}
221
222asmlinkage long sys_getgid16(void)
223{
224 return high2lowgid(current->gid);
225}
226
227asmlinkage long sys_getegid16(void)
228{
229 return high2lowgid(current->egid);
230}