Root/
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 (!nsown_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 | } |
231 |
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