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Source at commit cdde9cf73945d547acd3e96f9508c79e84ad0bf1 created 12 years 9 months ago. By Maarten ter Huurne, MMC: JZ4740: Added support for CPU frequency changing | |
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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 *, ruidp, old_uid_t __user *, euidp, old_uid_t __user *, suidp) |
85 | { |
86 | const struct cred *cred = current_cred(); |
87 | int retval; |
88 | old_uid_t ruid, euid, suid; |
89 | |
90 | ruid = high2lowuid(from_kuid_munged(cred->user_ns, cred->uid)); |
91 | euid = high2lowuid(from_kuid_munged(cred->user_ns, cred->euid)); |
92 | suid = high2lowuid(from_kuid_munged(cred->user_ns, cred->suid)); |
93 | |
94 | if (!(retval = put_user(ruid, ruidp)) && |
95 | !(retval = put_user(euid, euidp))) |
96 | retval = put_user(suid, suidp); |
97 | |
98 | return retval; |
99 | } |
100 | |
101 | SYSCALL_DEFINE3(setresgid16, old_gid_t, rgid, old_gid_t, egid, old_gid_t, sgid) |
102 | { |
103 | long ret = sys_setresgid(low2highgid(rgid), low2highgid(egid), |
104 | low2highgid(sgid)); |
105 | /* avoid REGPARM breakage on x86: */ |
106 | asmlinkage_protect(3, ret, rgid, egid, sgid); |
107 | return ret; |
108 | } |
109 | |
110 | |
111 | SYSCALL_DEFINE3(getresgid16, old_gid_t __user *, rgidp, old_gid_t __user *, egidp, old_gid_t __user *, sgidp) |
112 | { |
113 | const struct cred *cred = current_cred(); |
114 | int retval; |
115 | old_gid_t rgid, egid, sgid; |
116 | |
117 | rgid = high2lowgid(from_kgid_munged(cred->user_ns, cred->gid)); |
118 | egid = high2lowgid(from_kgid_munged(cred->user_ns, cred->egid)); |
119 | sgid = high2lowgid(from_kgid_munged(cred->user_ns, cred->sgid)); |
120 | |
121 | if (!(retval = put_user(rgid, rgidp)) && |
122 | !(retval = put_user(egid, egidp))) |
123 | retval = put_user(sgid, sgidp); |
124 | |
125 | return retval; |
126 | } |
127 | |
128 | SYSCALL_DEFINE1(setfsuid16, old_uid_t, uid) |
129 | { |
130 | long ret = sys_setfsuid(low2highuid(uid)); |
131 | /* avoid REGPARM breakage on x86: */ |
132 | asmlinkage_protect(1, ret, uid); |
133 | return ret; |
134 | } |
135 | |
136 | SYSCALL_DEFINE1(setfsgid16, old_gid_t, gid) |
137 | { |
138 | long ret = sys_setfsgid(low2highgid(gid)); |
139 | /* avoid REGPARM breakage on x86: */ |
140 | asmlinkage_protect(1, ret, gid); |
141 | return ret; |
142 | } |
143 | |
144 | static int groups16_to_user(old_gid_t __user *grouplist, |
145 | struct group_info *group_info) |
146 | { |
147 | struct user_namespace *user_ns = current_user_ns(); |
148 | int i; |
149 | old_gid_t group; |
150 | kgid_t kgid; |
151 | |
152 | for (i = 0; i < group_info->ngroups; i++) { |
153 | kgid = GROUP_AT(group_info, i); |
154 | group = high2lowgid(from_kgid_munged(user_ns, kgid)); |
155 | if (put_user(group, grouplist+i)) |
156 | return -EFAULT; |
157 | } |
158 | |
159 | return 0; |
160 | } |
161 | |
162 | static int groups16_from_user(struct group_info *group_info, |
163 | old_gid_t __user *grouplist) |
164 | { |
165 | struct user_namespace *user_ns = current_user_ns(); |
166 | int i; |
167 | old_gid_t group; |
168 | kgid_t kgid; |
169 | |
170 | for (i = 0; i < group_info->ngroups; i++) { |
171 | if (get_user(group, grouplist+i)) |
172 | return -EFAULT; |
173 | |
174 | kgid = make_kgid(user_ns, low2highgid(group)); |
175 | if (!gid_valid(kgid)) |
176 | return -EINVAL; |
177 | |
178 | GROUP_AT(group_info, i) = kgid; |
179 | } |
180 | |
181 | return 0; |
182 | } |
183 | |
184 | SYSCALL_DEFINE2(getgroups16, int, gidsetsize, old_gid_t __user *, grouplist) |
185 | { |
186 | const struct cred *cred = current_cred(); |
187 | int i; |
188 | |
189 | if (gidsetsize < 0) |
190 | return -EINVAL; |
191 | |
192 | i = cred->group_info->ngroups; |
193 | if (gidsetsize) { |
194 | if (i > gidsetsize) { |
195 | i = -EINVAL; |
196 | goto out; |
197 | } |
198 | if (groups16_to_user(grouplist, cred->group_info)) { |
199 | i = -EFAULT; |
200 | goto out; |
201 | } |
202 | } |
203 | out: |
204 | return i; |
205 | } |
206 | |
207 | SYSCALL_DEFINE2(setgroups16, int, gidsetsize, old_gid_t __user *, grouplist) |
208 | { |
209 | struct group_info *group_info; |
210 | int retval; |
211 | |
212 | if (!nsown_capable(CAP_SETGID)) |
213 | return -EPERM; |
214 | if ((unsigned)gidsetsize > NGROUPS_MAX) |
215 | return -EINVAL; |
216 | |
217 | group_info = groups_alloc(gidsetsize); |
218 | if (!group_info) |
219 | return -ENOMEM; |
220 | retval = groups16_from_user(group_info, grouplist); |
221 | if (retval) { |
222 | put_group_info(group_info); |
223 | return retval; |
224 | } |
225 | |
226 | retval = set_current_groups(group_info); |
227 | put_group_info(group_info); |
228 | |
229 | return retval; |
230 | } |
231 | |
232 | SYSCALL_DEFINE0(getuid16) |
233 | { |
234 | return high2lowuid(from_kuid_munged(current_user_ns(), current_uid())); |
235 | } |
236 | |
237 | SYSCALL_DEFINE0(geteuid16) |
238 | { |
239 | return high2lowuid(from_kuid_munged(current_user_ns(), current_euid())); |
240 | } |
241 | |
242 | SYSCALL_DEFINE0(getgid16) |
243 | { |
244 | return high2lowgid(from_kgid_munged(current_user_ns(), current_gid())); |
245 | } |
246 | |
247 | SYSCALL_DEFINE0(getegid16) |
248 | { |
249 | return high2lowgid(from_kgid_munged(current_user_ns(), current_egid())); |
250 | } |
251 |
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Tags:
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