Commit | Line | Data |
---|---|---|
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> | |
1da177e4 | 7 | #include <linux/mman.h> |
1da177e4 LT |
8 | #include <linux/notifier.h> |
9 | #include <linux/reboot.h> | |
10 | #include <linux/prctl.h> | |
c59ede7b | 11 | #include <linux/capability.h> |
1da177e4 LT |
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 | ||
ca013e94 | 19 | SYSCALL_DEFINE3(chown16, const char __user *, filename, old_uid_t, user, old_gid_t, group) |
1da177e4 | 20 | { |
5a7b46b3 OH |
21 | long ret = sys_chown(filename, low2highuid(user), low2highgid(group)); |
22 | /* avoid REGPARM breakage on x86: */ | |
54a01510 | 23 | asmlinkage_protect(3, ret, filename, user, group); |
5a7b46b3 | 24 | return ret; |
1da177e4 LT |
25 | } |
26 | ||
ca013e94 | 27 | SYSCALL_DEFINE3(lchown16, const char __user *, filename, old_uid_t, user, old_gid_t, group) |
1da177e4 | 28 | { |
5a7b46b3 OH |
29 | long ret = sys_lchown(filename, low2highuid(user), low2highgid(group)); |
30 | /* avoid REGPARM breakage on x86: */ | |
54a01510 | 31 | asmlinkage_protect(3, ret, filename, user, group); |
5a7b46b3 | 32 | return ret; |
1da177e4 LT |
33 | } |
34 | ||
ca013e94 | 35 | SYSCALL_DEFINE3(fchown16, unsigned int, fd, old_uid_t, user, old_gid_t, group) |
1da177e4 | 36 | { |
5a7b46b3 OH |
37 | long ret = sys_fchown(fd, low2highuid(user), low2highgid(group)); |
38 | /* avoid REGPARM breakage on x86: */ | |
54a01510 | 39 | asmlinkage_protect(3, ret, fd, user, group); |
5a7b46b3 | 40 | return ret; |
1da177e4 LT |
41 | } |
42 | ||
a6b42e83 | 43 | SYSCALL_DEFINE2(setregid16, old_gid_t, rgid, old_gid_t, egid) |
1da177e4 | 44 | { |
5a7b46b3 OH |
45 | long ret = sys_setregid(low2highgid(rgid), low2highgid(egid)); |
46 | /* avoid REGPARM breakage on x86: */ | |
54a01510 | 47 | asmlinkage_protect(2, ret, rgid, egid); |
5a7b46b3 | 48 | return ret; |
1da177e4 LT |
49 | } |
50 | ||
a6b42e83 | 51 | SYSCALL_DEFINE1(setgid16, old_gid_t, gid) |
1da177e4 | 52 | { |
5a7b46b3 OH |
53 | long ret = sys_setgid(low2highgid(gid)); |
54 | /* avoid REGPARM breakage on x86: */ | |
54a01510 | 55 | asmlinkage_protect(1, ret, gid); |
5a7b46b3 | 56 | return ret; |
1da177e4 LT |
57 | } |
58 | ||
a6b42e83 | 59 | SYSCALL_DEFINE2(setreuid16, old_uid_t, ruid, old_uid_t, euid) |
1da177e4 | 60 | { |
5a7b46b3 OH |
61 | long ret = sys_setreuid(low2highuid(ruid), low2highuid(euid)); |
62 | /* avoid REGPARM breakage on x86: */ | |
54a01510 | 63 | asmlinkage_protect(2, ret, ruid, euid); |
5a7b46b3 | 64 | return ret; |
1da177e4 LT |
65 | } |
66 | ||
a6b42e83 | 67 | SYSCALL_DEFINE1(setuid16, old_uid_t, uid) |
1da177e4 | 68 | { |
5a7b46b3 OH |
69 | long ret = sys_setuid(low2highuid(uid)); |
70 | /* avoid REGPARM breakage on x86: */ | |
54a01510 | 71 | asmlinkage_protect(1, ret, uid); |
5a7b46b3 | 72 | return ret; |
1da177e4 LT |
73 | } |
74 | ||
a6b42e83 | 75 | SYSCALL_DEFINE3(setresuid16, old_uid_t, ruid, old_uid_t, euid, old_uid_t, suid) |
1da177e4 | 76 | { |
5a7b46b3 OH |
77 | long ret = sys_setresuid(low2highuid(ruid), low2highuid(euid), |
78 | low2highuid(suid)); | |
79 | /* avoid REGPARM breakage on x86: */ | |
54a01510 | 80 | asmlinkage_protect(3, ret, ruid, euid, suid); |
5a7b46b3 | 81 | return ret; |
1da177e4 LT |
82 | } |
83 | ||
a6b42e83 | 84 | SYSCALL_DEFINE3(getresuid16, old_uid_t __user *, ruid, old_uid_t __user *, euid, old_uid_t __user *, suid) |
1da177e4 | 85 | { |
86a264ab | 86 | const struct cred *cred = current_cred(); |
1da177e4 LT |
87 | int retval; |
88 | ||
86a264ab DH |
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); | |
1da177e4 LT |
92 | |
93 | return retval; | |
94 | } | |
95 | ||
a6b42e83 | 96 | SYSCALL_DEFINE3(setresgid16, old_gid_t, rgid, old_gid_t, egid, old_gid_t, sgid) |
1da177e4 | 97 | { |
5a7b46b3 OH |
98 | long ret = sys_setresgid(low2highgid(rgid), low2highgid(egid), |
99 | low2highgid(sgid)); | |
100 | /* avoid REGPARM breakage on x86: */ | |
54a01510 | 101 | asmlinkage_protect(3, ret, rgid, egid, sgid); |
5a7b46b3 | 102 | return ret; |
1da177e4 LT |
103 | } |
104 | ||
a6b42e83 HC |
105 | |
106 | SYSCALL_DEFINE3(getresgid16, old_gid_t __user *, rgid, old_gid_t __user *, egid, old_gid_t __user *, sgid) | |
1da177e4 | 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 | ||
a6b42e83 | 118 | SYSCALL_DEFINE1(setfsuid16, old_uid_t, uid) |
1da177e4 | 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 | ||
a6b42e83 | 126 | SYSCALL_DEFINE1(setfsgid16, old_gid_t, gid) |
1da177e4 | 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 | { | |
ae2975bc | 137 | struct user_namespace *user_ns = current_user_ns(); |
1da177e4 LT |
138 | int i; |
139 | old_gid_t group; | |
ae2975bc | 140 | kgid_t kgid; |
1da177e4 LT |
141 | |
142 | for (i = 0; i < group_info->ngroups; i++) { | |
ae2975bc EB |
143 | kgid = GROUP_AT(group_info, i); |
144 | group = high2lowgid(from_kgid_munged(user_ns, kgid)); | |
1da177e4 LT |
145 | if (put_user(group, grouplist+i)) |
146 | return -EFAULT; | |
147 | } | |
148 | ||
149 | return 0; | |
150 | } | |
151 | ||
152 | static int groups16_from_user(struct group_info *group_info, | |
153 | old_gid_t __user *grouplist) | |
154 | { | |
ae2975bc | 155 | struct user_namespace *user_ns = current_user_ns(); |
1da177e4 LT |
156 | int i; |
157 | old_gid_t group; | |
ae2975bc | 158 | kgid_t kgid; |
1da177e4 LT |
159 | |
160 | for (i = 0; i < group_info->ngroups; i++) { | |
161 | if (get_user(group, grouplist+i)) | |
162 | return -EFAULT; | |
ae2975bc EB |
163 | |
164 | kgid = make_kgid(user_ns, low2highgid(group)); | |
165 | if (!gid_valid(kgid)) | |
166 | return -EINVAL; | |
167 | ||
168 | GROUP_AT(group_info, i) = kgid; | |
1da177e4 LT |
169 | } |
170 | ||
171 | return 0; | |
172 | } | |
173 | ||
003d7ab4 | 174 | SYSCALL_DEFINE2(getgroups16, int, gidsetsize, old_gid_t __user *, grouplist) |
1da177e4 | 175 | { |
86a264ab DH |
176 | const struct cred *cred = current_cred(); |
177 | int i; | |
1da177e4 LT |
178 | |
179 | if (gidsetsize < 0) | |
180 | return -EINVAL; | |
181 | ||
86a264ab | 182 | i = cred->group_info->ngroups; |
1da177e4 LT |
183 | if (gidsetsize) { |
184 | if (i > gidsetsize) { | |
185 | i = -EINVAL; | |
186 | goto out; | |
187 | } | |
86a264ab | 188 | if (groups16_to_user(grouplist, cred->group_info)) { |
1da177e4 LT |
189 | i = -EFAULT; |
190 | goto out; | |
191 | } | |
192 | } | |
193 | out: | |
1da177e4 LT |
194 | return i; |
195 | } | |
196 | ||
003d7ab4 | 197 | SYSCALL_DEFINE2(setgroups16, int, gidsetsize, old_gid_t __user *, grouplist) |
1da177e4 LT |
198 | { |
199 | struct group_info *group_info; | |
200 | int retval; | |
201 | ||
b0e77598 | 202 | if (!nsown_capable(CAP_SETGID)) |
1da177e4 LT |
203 | return -EPERM; |
204 | if ((unsigned)gidsetsize > NGROUPS_MAX) | |
205 | return -EINVAL; | |
206 | ||
207 | group_info = groups_alloc(gidsetsize); | |
208 | if (!group_info) | |
209 | return -ENOMEM; | |
210 | retval = groups16_from_user(group_info, grouplist); | |
211 | if (retval) { | |
212 | put_group_info(group_info); | |
213 | return retval; | |
214 | } | |
215 | ||
216 | retval = set_current_groups(group_info); | |
217 | put_group_info(group_info); | |
218 | ||
219 | return retval; | |
220 | } | |
221 | ||
003d7ab4 | 222 | SYSCALL_DEFINE0(getuid16) |
1da177e4 | 223 | { |
86a264ab | 224 | return high2lowuid(current_uid()); |
1da177e4 LT |
225 | } |
226 | ||
003d7ab4 | 227 | SYSCALL_DEFINE0(geteuid16) |
1da177e4 | 228 | { |
86a264ab | 229 | return high2lowuid(current_euid()); |
1da177e4 LT |
230 | } |
231 | ||
003d7ab4 | 232 | SYSCALL_DEFINE0(getgid16) |
1da177e4 | 233 | { |
86a264ab | 234 | return high2lowgid(current_gid()); |
1da177e4 LT |
235 | } |
236 | ||
003d7ab4 | 237 | SYSCALL_DEFINE0(getegid16) |
1da177e4 | 238 | { |
86a264ab | 239 | return high2lowgid(current_egid()); |
1da177e4 | 240 | } |