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Commit | Line | Data |
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1da177e4 LT |
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> | |
1da177e4 LT |
9 | #include <linux/notifier.h> |
10 | #include <linux/reboot.h> | |
11 | #include <linux/prctl.h> | |
c59ede7b | 12 | #include <linux/capability.h> |
1da177e4 LT |
13 | #include <linux/init.h> |
14 | #include <linux/highuid.h> | |
15 | #include <linux/security.h> | |
16 | #include <linux/syscalls.h> | |
17 | ||
18 | #include <asm/uaccess.h> | |
19 | ||
20 | asmlinkage long sys_chown16(const char __user * filename, old_uid_t user, old_gid_t group) | |
21 | { | |
5a7b46b3 OH |
22 | long ret = sys_chown(filename, low2highuid(user), low2highgid(group)); |
23 | /* avoid REGPARM breakage on x86: */ | |
54a01510 | 24 | asmlinkage_protect(3, ret, filename, user, group); |
5a7b46b3 | 25 | return ret; |
1da177e4 LT |
26 | } |
27 | ||
28 | asmlinkage long sys_lchown16(const char __user * filename, old_uid_t user, old_gid_t group) | |
29 | { | |
5a7b46b3 OH |
30 | long ret = sys_lchown(filename, low2highuid(user), low2highgid(group)); |
31 | /* avoid REGPARM breakage on x86: */ | |
54a01510 | 32 | asmlinkage_protect(3, ret, filename, user, group); |
5a7b46b3 | 33 | return ret; |
1da177e4 LT |
34 | } |
35 | ||
36 | asmlinkage long sys_fchown16(unsigned int fd, old_uid_t user, old_gid_t group) | |
37 | { | |
5a7b46b3 OH |
38 | long ret = sys_fchown(fd, low2highuid(user), low2highgid(group)); |
39 | /* avoid REGPARM breakage on x86: */ | |
54a01510 | 40 | asmlinkage_protect(3, ret, fd, user, group); |
5a7b46b3 | 41 | return ret; |
1da177e4 LT |
42 | } |
43 | ||
44 | asmlinkage long sys_setregid16(old_gid_t rgid, old_gid_t egid) | |
45 | { | |
5a7b46b3 OH |
46 | long ret = sys_setregid(low2highgid(rgid), low2highgid(egid)); |
47 | /* avoid REGPARM breakage on x86: */ | |
54a01510 | 48 | asmlinkage_protect(2, ret, rgid, egid); |
5a7b46b3 | 49 | return ret; |
1da177e4 LT |
50 | } |
51 | ||
52 | asmlinkage long sys_setgid16(old_gid_t gid) | |
53 | { | |
5a7b46b3 OH |
54 | long ret = sys_setgid(low2highgid(gid)); |
55 | /* avoid REGPARM breakage on x86: */ | |
54a01510 | 56 | asmlinkage_protect(1, ret, gid); |
5a7b46b3 | 57 | return ret; |
1da177e4 LT |
58 | } |
59 | ||
60 | asmlinkage long sys_setreuid16(old_uid_t ruid, old_uid_t euid) | |
61 | { | |
5a7b46b3 OH |
62 | long ret = sys_setreuid(low2highuid(ruid), low2highuid(euid)); |
63 | /* avoid REGPARM breakage on x86: */ | |
54a01510 | 64 | asmlinkage_protect(2, ret, ruid, euid); |
5a7b46b3 | 65 | return ret; |
1da177e4 LT |
66 | } |
67 | ||
68 | asmlinkage long sys_setuid16(old_uid_t uid) | |
69 | { | |
5a7b46b3 OH |
70 | long ret = sys_setuid(low2highuid(uid)); |
71 | /* avoid REGPARM breakage on x86: */ | |
54a01510 | 72 | asmlinkage_protect(1, ret, uid); |
5a7b46b3 | 73 | return ret; |
1da177e4 LT |
74 | } |
75 | ||
76 | asmlinkage long sys_setresuid16(old_uid_t ruid, old_uid_t euid, old_uid_t suid) | |
77 | { | |
5a7b46b3 OH |
78 | long ret = sys_setresuid(low2highuid(ruid), low2highuid(euid), |
79 | low2highuid(suid)); | |
80 | /* avoid REGPARM breakage on x86: */ | |
54a01510 | 81 | asmlinkage_protect(3, ret, ruid, euid, suid); |
5a7b46b3 | 82 | return ret; |
1da177e4 LT |
83 | } |
84 | ||
85 | asmlinkage long sys_getresuid16(old_uid_t __user *ruid, old_uid_t __user *euid, old_uid_t __user *suid) | |
86 | { | |
86a264ab | 87 | const struct cred *cred = current_cred(); |
1da177e4 LT |
88 | int retval; |
89 | ||
86a264ab DH |
90 | if (!(retval = put_user(high2lowuid(cred->uid), ruid)) && |
91 | !(retval = put_user(high2lowuid(cred->euid), euid))) | |
92 | retval = put_user(high2lowuid(cred->suid), suid); | |
1da177e4 LT |
93 | |
94 | return retval; | |
95 | } | |
96 | ||
97 | asmlinkage long sys_setresgid16(old_gid_t rgid, old_gid_t egid, old_gid_t sgid) | |
98 | { | |
5a7b46b3 OH |
99 | long ret = sys_setresgid(low2highgid(rgid), low2highgid(egid), |
100 | low2highgid(sgid)); | |
101 | /* avoid REGPARM breakage on x86: */ | |
54a01510 | 102 | asmlinkage_protect(3, ret, rgid, egid, sgid); |
5a7b46b3 | 103 | return ret; |
1da177e4 LT |
104 | } |
105 | ||
106 | asmlinkage long sys_getresgid16(old_gid_t __user *rgid, old_gid_t __user *egid, old_gid_t __user *sgid) | |
107 | { | |
86a264ab | 108 | const struct cred *cred = current_cred(); |
1da177e4 LT |
109 | int retval; |
110 | ||
86a264ab DH |
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); | |
1da177e4 LT |
114 | |
115 | return retval; | |
116 | } | |
117 | ||
118 | asmlinkage long sys_setfsuid16(old_uid_t uid) | |
119 | { | |
5a7b46b3 OH |
120 | long ret = sys_setfsuid(low2highuid(uid)); |
121 | /* avoid REGPARM breakage on x86: */ | |
54a01510 | 122 | asmlinkage_protect(1, ret, uid); |
5a7b46b3 | 123 | return ret; |
1da177e4 LT |
124 | } |
125 | ||
126 | asmlinkage long sys_setfsgid16(old_gid_t gid) | |
127 | { | |
5a7b46b3 OH |
128 | long ret = sys_setfsgid(low2highgid(gid)); |
129 | /* avoid REGPARM breakage on x86: */ | |
54a01510 | 130 | asmlinkage_protect(1, ret, gid); |
5a7b46b3 | 131 | return ret; |
1da177e4 LT |
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 | asmlinkage long sys_getgroups16(int gidsetsize, old_gid_t __user *grouplist) | |
165 | { | |
86a264ab DH |
166 | const struct cred *cred = current_cred(); |
167 | int i; | |
1da177e4 LT |
168 | |
169 | if (gidsetsize < 0) | |
170 | return -EINVAL; | |
171 | ||
86a264ab | 172 | i = cred->group_info->ngroups; |
1da177e4 LT |
173 | if (gidsetsize) { |
174 | if (i > gidsetsize) { | |
175 | i = -EINVAL; | |
176 | goto out; | |
177 | } | |
86a264ab | 178 | if (groups16_to_user(grouplist, cred->group_info)) { |
1da177e4 LT |
179 | i = -EFAULT; |
180 | goto out; | |
181 | } | |
182 | } | |
183 | out: | |
1da177e4 LT |
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 | { | |
86a264ab | 214 | return high2lowuid(current_uid()); |
1da177e4 LT |
215 | } |
216 | ||
217 | asmlinkage long sys_geteuid16(void) | |
218 | { | |
86a264ab | 219 | return high2lowuid(current_euid()); |
1da177e4 LT |
220 | } |
221 | ||
222 | asmlinkage long sys_getgid16(void) | |
223 | { | |
86a264ab | 224 | return high2lowgid(current_gid()); |
1da177e4 LT |
225 | } |
226 | ||
227 | asmlinkage long sys_getegid16(void) | |
228 | { | |
86a264ab | 229 | return high2lowgid(current_egid()); |
1da177e4 | 230 | } |