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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 | long ret = sys_chown(filename, low2highuid(user), low2highgid(group)); | |
22 | /* avoid REGPARM breakage on x86: */ | |
23 | asmlinkage_protect(3, ret, filename, user, group); | |
24 | return ret; | |
25 | } | |
26 | ||
27 | SYSCALL_DEFINE3(lchown16, const char __user *, filename, old_uid_t, user, old_gid_t, group) | |
28 | { | |
29 | long ret = sys_lchown(filename, low2highuid(user), low2highgid(group)); | |
30 | /* avoid REGPARM breakage on x86: */ | |
31 | asmlinkage_protect(3, ret, filename, user, group); | |
32 | return ret; | |
33 | } | |
34 | ||
35 | SYSCALL_DEFINE3(fchown16, unsigned int, fd, old_uid_t, user, old_gid_t, group) | |
36 | { | |
37 | long ret = sys_fchown(fd, low2highuid(user), low2highgid(group)); | |
38 | /* avoid REGPARM breakage on x86: */ | |
39 | asmlinkage_protect(3, ret, fd, user, group); | |
40 | return ret; | |
41 | } | |
42 | ||
43 | SYSCALL_DEFINE2(setregid16, old_gid_t, rgid, old_gid_t, egid) | |
44 | { | |
45 | long ret = sys_setregid(low2highgid(rgid), low2highgid(egid)); | |
46 | /* avoid REGPARM breakage on x86: */ | |
47 | asmlinkage_protect(2, ret, rgid, egid); | |
48 | return ret; | |
49 | } | |
50 | ||
51 | SYSCALL_DEFINE1(setgid16, old_gid_t, gid) | |
52 | { | |
53 | long ret = sys_setgid(low2highgid(gid)); | |
54 | /* avoid REGPARM breakage on x86: */ | |
55 | asmlinkage_protect(1, ret, gid); | |
56 | return ret; | |
57 | } | |
58 | ||
59 | SYSCALL_DEFINE2(setreuid16, old_uid_t, ruid, old_uid_t, euid) | |
60 | { | |
61 | long ret = sys_setreuid(low2highuid(ruid), low2highuid(euid)); | |
62 | /* avoid REGPARM breakage on x86: */ | |
63 | asmlinkage_protect(2, ret, ruid, euid); | |
64 | return ret; | |
65 | } | |
66 | ||
67 | SYSCALL_DEFINE1(setuid16, old_uid_t, uid) | |
68 | { | |
69 | long ret = sys_setuid(low2highuid(uid)); | |
70 | /* avoid REGPARM breakage on x86: */ | |
71 | asmlinkage_protect(1, ret, uid); | |
72 | return ret; | |
73 | } | |
74 | ||
75 | SYSCALL_DEFINE3(setresuid16, old_uid_t, ruid, old_uid_t, euid, old_uid_t, suid) | |
76 | { | |
77 | long ret = sys_setresuid(low2highuid(ruid), low2highuid(euid), | |
78 | low2highuid(suid)); | |
79 | /* avoid REGPARM breakage on x86: */ | |
80 | asmlinkage_protect(3, ret, ruid, euid, suid); | |
81 | return ret; | |
82 | } | |
83 | ||
84 | SYSCALL_DEFINE3(getresuid16, old_uid_t __user *, ruid, old_uid_t __user *, euid, old_uid_t __user *, suid) | |
85 | { | |
86 | const struct cred *cred = current_cred(); | |
87 | int retval; | |
88 | ||
89 | if (!(retval = put_user(high2lowuid(cred->uid), ruid)) && | |
90 | !(retval = put_user(high2lowuid(cred->euid), euid))) | |
91 | retval = put_user(high2lowuid(cred->suid), suid); | |
92 | ||
93 | return retval; | |
94 | } | |
95 | ||
96 | SYSCALL_DEFINE3(setresgid16, old_gid_t, rgid, old_gid_t, egid, old_gid_t, sgid) | |
97 | { | |
98 | long ret = sys_setresgid(low2highgid(rgid), low2highgid(egid), | |
99 | low2highgid(sgid)); | |
100 | /* avoid REGPARM breakage on x86: */ | |
101 | asmlinkage_protect(3, ret, rgid, egid, sgid); | |
102 | return ret; | |
103 | } | |
104 | ||
105 | ||
106 | SYSCALL_DEFINE3(getresgid16, old_gid_t __user *, rgid, old_gid_t __user *, egid, old_gid_t __user *, sgid) | |
107 | { | |
108 | const struct cred *cred = current_cred(); | |
109 | int retval; | |
110 | ||
111 | if (!(retval = put_user(high2lowgid(cred->gid), rgid)) && | |
112 | !(retval = put_user(high2lowgid(cred->egid), egid))) | |
113 | retval = put_user(high2lowgid(cred->sgid), sgid); | |
114 | ||
115 | return retval; | |
116 | } | |
117 | ||
118 | SYSCALL_DEFINE1(setfsuid16, old_uid_t, uid) | |
119 | { | |
120 | long ret = sys_setfsuid(low2highuid(uid)); | |
121 | /* avoid REGPARM breakage on x86: */ | |
122 | asmlinkage_protect(1, ret, uid); | |
123 | return ret; | |
124 | } | |
125 | ||
126 | SYSCALL_DEFINE1(setfsgid16, old_gid_t, gid) | |
127 | { | |
128 | long ret = sys_setfsgid(low2highgid(gid)); | |
129 | /* avoid REGPARM breakage on x86: */ | |
130 | asmlinkage_protect(1, ret, gid); | |
131 | return ret; | |
132 | } | |
133 | ||
134 | static int groups16_to_user(old_gid_t __user *grouplist, | |
135 | struct group_info *group_info) | |
136 | { | |
137 | int i; | |
138 | old_gid_t group; | |
139 | ||
140 | for (i = 0; i < group_info->ngroups; i++) { | |
141 | group = high2lowgid(GROUP_AT(group_info, i)); | |
142 | if (put_user(group, grouplist+i)) | |
143 | return -EFAULT; | |
144 | } | |
145 | ||
146 | return 0; | |
147 | } | |
148 | ||
149 | static int groups16_from_user(struct group_info *group_info, | |
150 | old_gid_t __user *grouplist) | |
151 | { | |
152 | int i; | |
153 | old_gid_t group; | |
154 | ||
155 | for (i = 0; i < group_info->ngroups; i++) { | |
156 | if (get_user(group, grouplist+i)) | |
157 | return -EFAULT; | |
158 | GROUP_AT(group_info, i) = low2highgid(group); | |
159 | } | |
160 | ||
161 | return 0; | |
162 | } | |
163 | ||
164 | SYSCALL_DEFINE2(getgroups16, int, gidsetsize, old_gid_t __user *, grouplist) | |
165 | { | |
166 | const struct cred *cred = current_cred(); | |
167 | int i; | |
168 | ||
169 | if (gidsetsize < 0) | |
170 | return -EINVAL; | |
171 | ||
172 | i = cred->group_info->ngroups; | |
173 | if (gidsetsize) { | |
174 | if (i > gidsetsize) { | |
175 | i = -EINVAL; | |
176 | goto out; | |
177 | } | |
178 | if (groups16_to_user(grouplist, cred->group_info)) { | |
179 | i = -EFAULT; | |
180 | goto out; | |
181 | } | |
182 | } | |
183 | out: | |
184 | return i; | |
185 | } | |
186 | ||
187 | SYSCALL_DEFINE2(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 | SYSCALL_DEFINE0(getuid16) | |
213 | { | |
214 | return high2lowuid(current_uid()); | |
215 | } | |
216 | ||
217 | SYSCALL_DEFINE0(geteuid16) | |
218 | { | |
219 | return high2lowuid(current_euid()); | |
220 | } | |
221 | ||
222 | SYSCALL_DEFINE0(getgid16) | |
223 | { | |
224 | return high2lowgid(current_gid()); | |
225 | } | |
226 | ||
227 | SYSCALL_DEFINE0(getegid16) | |
228 | { | |
229 | return high2lowgid(current_egid()); | |
230 | } |