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