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.
7 #include <linux/utsname.h>
8 #include <linux/mman.h>
9 #include <linux/notifier.h>
10 #include <linux/reboot.h>
11 #include <linux/prctl.h>
12 #include <linux/capability.h>
13 #include <linux/init.h>
14 #include <linux/highuid.h>
15 #include <linux/security.h>
16 #include <linux/syscalls.h>
18 #include <asm/uaccess.h>
20 SYSCALL_DEFINE3(chown16, const char __user *, filename, old_uid_t, user, old_gid_t, group)
22 long ret = sys_chown(filename, low2highuid(user), low2highgid(group));
23 /* avoid REGPARM breakage on x86: */
24 asmlinkage_protect(3, ret, filename, user, group);
28 SYSCALL_DEFINE3(lchown16, const char __user *, filename, old_uid_t, user, old_gid_t, group)
30 long ret = sys_lchown(filename, low2highuid(user), low2highgid(group));
31 /* avoid REGPARM breakage on x86: */
32 asmlinkage_protect(3, ret, filename, user, group);
36 SYSCALL_DEFINE3(fchown16, unsigned int, fd, old_uid_t, user, old_gid_t, group)
38 long ret = sys_fchown(fd, low2highuid(user), low2highgid(group));
39 /* avoid REGPARM breakage on x86: */
40 asmlinkage_protect(3, ret, fd, user, group);
44 SYSCALL_DEFINE2(setregid16, old_gid_t, rgid, old_gid_t, egid)
46 long ret = sys_setregid(low2highgid(rgid), low2highgid(egid));
47 /* avoid REGPARM breakage on x86: */
48 asmlinkage_protect(2, ret, rgid, egid);
52 SYSCALL_DEFINE1(setgid16, old_gid_t, gid)
54 long ret = sys_setgid(low2highgid(gid));
55 /* avoid REGPARM breakage on x86: */
56 asmlinkage_protect(1, ret, gid);
60 SYSCALL_DEFINE2(setreuid16, old_uid_t, ruid, old_uid_t, euid)
62 long ret = sys_setreuid(low2highuid(ruid), low2highuid(euid));
63 /* avoid REGPARM breakage on x86: */
64 asmlinkage_protect(2, ret, ruid, euid);
68 SYSCALL_DEFINE1(setuid16, old_uid_t, uid)
70 long ret = sys_setuid(low2highuid(uid));
71 /* avoid REGPARM breakage on x86: */
72 asmlinkage_protect(1, ret, uid);
76 SYSCALL_DEFINE3(setresuid16, old_uid_t, ruid, old_uid_t, euid, old_uid_t, suid)
78 long ret = sys_setresuid(low2highuid(ruid), low2highuid(euid),
80 /* avoid REGPARM breakage on x86: */
81 asmlinkage_protect(3, ret, ruid, euid, suid);
85 SYSCALL_DEFINE3(getresuid16, old_uid_t __user *, ruid, old_uid_t __user *, euid, old_uid_t __user *, suid)
89 if (!(retval = put_user(high2lowuid(current->uid), ruid)) &&
90 !(retval = put_user(high2lowuid(current->euid), euid)))
91 retval = put_user(high2lowuid(current->suid), suid);
96 SYSCALL_DEFINE3(setresgid16, old_gid_t, rgid, old_gid_t, egid, old_gid_t, sgid)
98 long ret = sys_setresgid(low2highgid(rgid), low2highgid(egid),
100 /* avoid REGPARM breakage on x86: */
101 asmlinkage_protect(3, ret, rgid, egid, sgid);
106 SYSCALL_DEFINE3(getresgid16, old_gid_t __user *, rgid, old_gid_t __user *, egid, old_gid_t __user *, sgid)
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);
117 SYSCALL_DEFINE1(setfsuid16, old_uid_t, uid)
119 long ret = sys_setfsuid(low2highuid(uid));
120 /* avoid REGPARM breakage on x86: */
121 asmlinkage_protect(1, ret, uid);
125 SYSCALL_DEFINE1(setfsgid16, old_gid_t, gid)
127 long ret = sys_setfsgid(low2highgid(gid));
128 /* avoid REGPARM breakage on x86: */
129 asmlinkage_protect(1, ret, gid);
133 static int groups16_to_user(old_gid_t __user *grouplist,
134 struct group_info *group_info)
139 for (i = 0; i < group_info->ngroups; i++) {
140 group = high2lowgid(GROUP_AT(group_info, i));
141 if (put_user(group, grouplist+i))
148 static int groups16_from_user(struct group_info *group_info,
149 old_gid_t __user *grouplist)
154 for (i = 0; i < group_info->ngroups; i++) {
155 if (get_user(group, grouplist+i))
157 GROUP_AT(group_info, i) = low2highgid(group);
163 SYSCALL_DEFINE2(getgroups16, int, gidsetsize, old_gid_t __user *, grouplist)
170 get_group_info(current->group_info);
171 i = current->group_info->ngroups;
173 if (i > gidsetsize) {
177 if (groups16_to_user(grouplist, current->group_info)) {
183 put_group_info(current->group_info);
187 SYSCALL_DEFINE2(setgroups16, int, gidsetsize, old_gid_t __user *, grouplist)
189 struct group_info *group_info;
192 if (!capable(CAP_SETGID))
194 if ((unsigned)gidsetsize > NGROUPS_MAX)
197 group_info = groups_alloc(gidsetsize);
200 retval = groups16_from_user(group_info, grouplist);
202 put_group_info(group_info);
206 retval = set_current_groups(group_info);
207 put_group_info(group_info);
212 SYSCALL_DEFINE0(getuid16)
214 return high2lowuid(current->uid);
217 SYSCALL_DEFINE0(geteuid16)
219 return high2lowuid(current->euid);
222 SYSCALL_DEFINE0(getgid16)
224 return high2lowgid(current->gid);
227 SYSCALL_DEFINE0(getegid16)
229 return high2lowgid(current->egid);