crypto: tegra-se: fix resourse leak
[linux-3.10.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/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/syscalls.h>
16
17 #include <asm/uaccess.h>
18
19 SYSCALL_DEFINE3(chown16, const char __user *, filename, old_uid_t, user, old_gid_t, group)
20 {
21         return sys_chown(filename, low2highuid(user), low2highgid(group));
22 }
23
24 SYSCALL_DEFINE3(lchown16, const char __user *, filename, old_uid_t, user, old_gid_t, group)
25 {
26         return sys_lchown(filename, low2highuid(user), low2highgid(group));
27 }
28
29 SYSCALL_DEFINE3(fchown16, unsigned int, fd, old_uid_t, user, old_gid_t, group)
30 {
31         return sys_fchown(fd, low2highuid(user), low2highgid(group));
32 }
33
34 SYSCALL_DEFINE2(setregid16, old_gid_t, rgid, old_gid_t, egid)
35 {
36         return sys_setregid(low2highgid(rgid), low2highgid(egid));
37 }
38
39 SYSCALL_DEFINE1(setgid16, old_gid_t, gid)
40 {
41         return sys_setgid(low2highgid(gid));
42 }
43
44 SYSCALL_DEFINE2(setreuid16, old_uid_t, ruid, old_uid_t, euid)
45 {
46         return sys_setreuid(low2highuid(ruid), low2highuid(euid));
47 }
48
49 SYSCALL_DEFINE1(setuid16, old_uid_t, uid)
50 {
51         return sys_setuid(low2highuid(uid));
52 }
53
54 SYSCALL_DEFINE3(setresuid16, old_uid_t, ruid, old_uid_t, euid, old_uid_t, suid)
55 {
56         return sys_setresuid(low2highuid(ruid), low2highuid(euid),
57                                  low2highuid(suid));
58 }
59
60 SYSCALL_DEFINE3(getresuid16, old_uid_t __user *, ruidp, old_uid_t __user *, euidp, old_uid_t __user *, suidp)
61 {
62         const struct cred *cred = current_cred();
63         int retval;
64         old_uid_t ruid, euid, suid;
65
66         ruid = high2lowuid(from_kuid_munged(cred->user_ns, cred->uid));
67         euid = high2lowuid(from_kuid_munged(cred->user_ns, cred->euid));
68         suid = high2lowuid(from_kuid_munged(cred->user_ns, cred->suid));
69
70         if (!(retval   = put_user(ruid, ruidp)) &&
71             !(retval   = put_user(euid, euidp)))
72                 retval = put_user(suid, suidp);
73
74         return retval;
75 }
76
77 SYSCALL_DEFINE3(setresgid16, old_gid_t, rgid, old_gid_t, egid, old_gid_t, sgid)
78 {
79         return sys_setresgid(low2highgid(rgid), low2highgid(egid),
80                                  low2highgid(sgid));
81 }
82
83
84 SYSCALL_DEFINE3(getresgid16, old_gid_t __user *, rgidp, old_gid_t __user *, egidp, old_gid_t __user *, sgidp)
85 {
86         const struct cred *cred = current_cred();
87         int retval;
88         old_gid_t rgid, egid, sgid;
89
90         rgid = high2lowgid(from_kgid_munged(cred->user_ns, cred->gid));
91         egid = high2lowgid(from_kgid_munged(cred->user_ns, cred->egid));
92         sgid = high2lowgid(from_kgid_munged(cred->user_ns, cred->sgid));
93
94         if (!(retval   = put_user(rgid, rgidp)) &&
95             !(retval   = put_user(egid, egidp)))
96                 retval = put_user(sgid, sgidp);
97
98         return retval;
99 }
100
101 SYSCALL_DEFINE1(setfsuid16, old_uid_t, uid)
102 {
103         return sys_setfsuid(low2highuid(uid));
104 }
105
106 SYSCALL_DEFINE1(setfsgid16, old_gid_t, gid)
107 {
108         return sys_setfsgid(low2highgid(gid));
109 }
110
111 static int groups16_to_user(old_gid_t __user *grouplist,
112     struct group_info *group_info)
113 {
114         struct user_namespace *user_ns = current_user_ns();
115         int i;
116         old_gid_t group;
117         kgid_t kgid;
118
119         for (i = 0; i < group_info->ngroups; i++) {
120                 kgid = GROUP_AT(group_info, i);
121                 group = high2lowgid(from_kgid_munged(user_ns, kgid));
122                 if (put_user(group, grouplist+i))
123                         return -EFAULT;
124         }
125
126         return 0;
127 }
128
129 static int groups16_from_user(struct group_info *group_info,
130     old_gid_t __user *grouplist)
131 {
132         struct user_namespace *user_ns = current_user_ns();
133         int i;
134         old_gid_t group;
135         kgid_t kgid;
136
137         for (i = 0; i < group_info->ngroups; i++) {
138                 if (get_user(group, grouplist+i))
139                         return  -EFAULT;
140
141                 kgid = make_kgid(user_ns, low2highgid(group));
142                 if (!gid_valid(kgid))
143                         return -EINVAL;
144
145                 GROUP_AT(group_info, i) = kgid;
146         }
147
148         return 0;
149 }
150
151 SYSCALL_DEFINE2(getgroups16, int, gidsetsize, old_gid_t __user *, grouplist)
152 {
153         const struct cred *cred = current_cred();
154         int i;
155
156         if (gidsetsize < 0)
157                 return -EINVAL;
158
159         i = cred->group_info->ngroups;
160         if (gidsetsize) {
161                 if (i > gidsetsize) {
162                         i = -EINVAL;
163                         goto out;
164                 }
165                 if (groups16_to_user(grouplist, cred->group_info)) {
166                         i = -EFAULT;
167                         goto out;
168                 }
169         }
170 out:
171         return i;
172 }
173
174 SYSCALL_DEFINE2(setgroups16, int, gidsetsize, old_gid_t __user *, grouplist)
175 {
176         struct group_info *group_info;
177         int retval;
178
179         if (!nsown_capable(CAP_SETGID))
180                 return -EPERM;
181         if ((unsigned)gidsetsize > NGROUPS_MAX)
182                 return -EINVAL;
183
184         group_info = groups_alloc(gidsetsize);
185         if (!group_info)
186                 return -ENOMEM;
187         retval = groups16_from_user(group_info, grouplist);
188         if (retval) {
189                 put_group_info(group_info);
190                 return retval;
191         }
192
193         retval = set_current_groups(group_info);
194         put_group_info(group_info);
195
196         return retval;
197 }
198
199 SYSCALL_DEFINE0(getuid16)
200 {
201         return high2lowuid(from_kuid_munged(current_user_ns(), current_uid()));
202 }
203
204 SYSCALL_DEFINE0(geteuid16)
205 {
206         return high2lowuid(from_kuid_munged(current_user_ns(), current_euid()));
207 }
208
209 SYSCALL_DEFINE0(getgid16)
210 {
211         return high2lowgid(from_kgid_munged(current_user_ns(), current_gid()));
212 }
213
214 SYSCALL_DEFINE0(getegid16)
215 {
216         return high2lowgid(from_kgid_munged(current_user_ns(), current_egid()));
217 }