ia64/linux-2.6.18-xen.hg

view kernel/uid16.c @ 912:dd42cdb0ab89

[IA64] Build blktap2 driver by default in x86 builds.

add CONFIG_XEN_BLKDEV_TAP2=y to buildconfigs/linux-defconfig_xen_ia64.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
author Isaku Yamahata <yamahata@valinux.co.jp>
date Mon Jun 29 12:09:16 2009 +0900 (2009-06-29)
parents 831230e53067
children
line source
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 */
6 #include <linux/mm.h>
7 #include <linux/utsname.h>
8 #include <linux/mman.h>
9 #include <linux/smp_lock.h>
10 #include <linux/notifier.h>
11 #include <linux/reboot.h>
12 #include <linux/prctl.h>
13 #include <linux/capability.h>
14 #include <linux/init.h>
15 #include <linux/highuid.h>
16 #include <linux/security.h>
17 #include <linux/syscalls.h>
19 #include <asm/uaccess.h>
21 asmlinkage long sys_chown16(const char __user * filename, old_uid_t user, old_gid_t group)
22 {
23 long ret = sys_chown(filename, low2highuid(user), low2highgid(group));
24 /* avoid REGPARM breakage on x86: */
25 prevent_tail_call(ret);
26 return ret;
27 }
29 asmlinkage long sys_lchown16(const char __user * filename, old_uid_t user, old_gid_t group)
30 {
31 long ret = sys_lchown(filename, low2highuid(user), low2highgid(group));
32 /* avoid REGPARM breakage on x86: */
33 prevent_tail_call(ret);
34 return ret;
35 }
37 asmlinkage long sys_fchown16(unsigned int fd, old_uid_t user, old_gid_t group)
38 {
39 long ret = sys_fchown(fd, low2highuid(user), low2highgid(group));
40 /* avoid REGPARM breakage on x86: */
41 prevent_tail_call(ret);
42 return ret;
43 }
45 asmlinkage long sys_setregid16(old_gid_t rgid, old_gid_t egid)
46 {
47 long ret = sys_setregid(low2highgid(rgid), low2highgid(egid));
48 /* avoid REGPARM breakage on x86: */
49 prevent_tail_call(ret);
50 return ret;
51 }
53 asmlinkage long sys_setgid16(old_gid_t gid)
54 {
55 long ret = sys_setgid(low2highgid(gid));
56 /* avoid REGPARM breakage on x86: */
57 prevent_tail_call(ret);
58 return ret;
59 }
61 asmlinkage long sys_setreuid16(old_uid_t ruid, old_uid_t euid)
62 {
63 long ret = sys_setreuid(low2highuid(ruid), low2highuid(euid));
64 /* avoid REGPARM breakage on x86: */
65 prevent_tail_call(ret);
66 return ret;
67 }
69 asmlinkage long sys_setuid16(old_uid_t uid)
70 {
71 long ret = sys_setuid(low2highuid(uid));
72 /* avoid REGPARM breakage on x86: */
73 prevent_tail_call(ret);
74 return ret;
75 }
77 asmlinkage long sys_setresuid16(old_uid_t ruid, old_uid_t euid, old_uid_t suid)
78 {
79 long ret = sys_setresuid(low2highuid(ruid), low2highuid(euid),
80 low2highuid(suid));
81 /* avoid REGPARM breakage on x86: */
82 prevent_tail_call(ret);
83 return ret;
84 }
86 asmlinkage long sys_getresuid16(old_uid_t __user *ruid, old_uid_t __user *euid, old_uid_t __user *suid)
87 {
88 int retval;
90 if (!(retval = put_user(high2lowuid(current->uid), ruid)) &&
91 !(retval = put_user(high2lowuid(current->euid), euid)))
92 retval = put_user(high2lowuid(current->suid), suid);
94 return retval;
95 }
97 asmlinkage long sys_setresgid16(old_gid_t rgid, old_gid_t egid, old_gid_t sgid)
98 {
99 long ret = sys_setresgid(low2highgid(rgid), low2highgid(egid),
100 low2highgid(sgid));
101 /* avoid REGPARM breakage on x86: */
102 prevent_tail_call(ret);
103 return ret;
104 }
106 asmlinkage long sys_getresgid16(old_gid_t __user *rgid, old_gid_t __user *egid, old_gid_t __user *sgid)
107 {
108 int retval;
110 if (!(retval = put_user(high2lowgid(current->gid), rgid)) &&
111 !(retval = put_user(high2lowgid(current->egid), egid)))
112 retval = put_user(high2lowgid(current->sgid), sgid);
114 return retval;
115 }
117 asmlinkage long sys_setfsuid16(old_uid_t uid)
118 {
119 long ret = sys_setfsuid(low2highuid(uid));
120 /* avoid REGPARM breakage on x86: */
121 prevent_tail_call(ret);
122 return ret;
123 }
125 asmlinkage long sys_setfsgid16(old_gid_t gid)
126 {
127 long ret = sys_setfsgid(low2highgid(gid));
128 /* avoid REGPARM breakage on x86: */
129 prevent_tail_call(ret);
130 return ret;
131 }
133 static int groups16_to_user(old_gid_t __user *grouplist,
134 struct group_info *group_info)
135 {
136 int i;
137 old_gid_t group;
139 for (i = 0; i < group_info->ngroups; i++) {
140 group = high2lowgid(GROUP_AT(group_info, i));
141 if (put_user(group, grouplist+i))
142 return -EFAULT;
143 }
145 return 0;
146 }
148 static int groups16_from_user(struct group_info *group_info,
149 old_gid_t __user *grouplist)
150 {
151 int i;
152 old_gid_t group;
154 for (i = 0; i < group_info->ngroups; i++) {
155 if (get_user(group, grouplist+i))
156 return -EFAULT;
157 GROUP_AT(group_info, i) = low2highgid(group);
158 }
160 return 0;
161 }
163 asmlinkage long sys_getgroups16(int gidsetsize, old_gid_t __user *grouplist)
164 {
165 int i = 0;
167 if (gidsetsize < 0)
168 return -EINVAL;
170 get_group_info(current->group_info);
171 i = current->group_info->ngroups;
172 if (gidsetsize) {
173 if (i > gidsetsize) {
174 i = -EINVAL;
175 goto out;
176 }
177 if (groups16_to_user(grouplist, current->group_info)) {
178 i = -EFAULT;
179 goto out;
180 }
181 }
182 out:
183 put_group_info(current->group_info);
184 return i;
185 }
187 asmlinkage long sys_setgroups16(int gidsetsize, old_gid_t __user *grouplist)
188 {
189 struct group_info *group_info;
190 int retval;
192 if (!capable(CAP_SETGID))
193 return -EPERM;
194 if ((unsigned)gidsetsize > NGROUPS_MAX)
195 return -EINVAL;
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 }
206 retval = set_current_groups(group_info);
207 put_group_info(group_info);
209 return retval;
210 }
212 asmlinkage long sys_getuid16(void)
213 {
214 return high2lowuid(current->uid);
215 }
217 asmlinkage long sys_geteuid16(void)
218 {
219 return high2lowuid(current->euid);
220 }
222 asmlinkage long sys_getgid16(void)
223 {
224 return high2lowgid(current->gid);
225 }
227 asmlinkage long sys_getegid16(void)
228 {
229 return high2lowgid(current->egid);
230 }