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 asmlinkage long sys_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 asmlinkage long sys_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 asmlinkage long sys_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 asmlinkage long sys_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 asmlinkage long sys_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 asmlinkage long sys_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 asmlinkage long sys_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 asmlinkage long sys_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 asmlinkage long sys_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 asmlinkage long sys_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);
105 asmlinkage long sys_getresgid16(old_gid_t __user *rgid, old_gid_t __user *egid, old_gid_t __user *sgid)
109 if (!(retval = put_user(high2lowgid(current->gid), rgid)) &&
110 !(retval = put_user(high2lowgid(current->egid), egid)))
111 retval = put_user(high2lowgid(current->sgid), sgid);
116 asmlinkage long sys_setfsuid16(old_uid_t uid)
118 long ret = sys_setfsuid(low2highuid(uid));
119 /* avoid REGPARM breakage on x86: */
120 asmlinkage_protect(1, ret, uid);
124 asmlinkage long sys_setfsgid16(old_gid_t gid)
126 long ret = sys_setfsgid(low2highgid(gid));
127 /* avoid REGPARM breakage on x86: */
128 asmlinkage_protect(1, ret, gid);
132 static int groups16_to_user(old_gid_t __user *grouplist,
133 struct group_info *group_info)
138 for (i = 0; i < group_info->ngroups; i++) {
139 group = high2lowgid(GROUP_AT(group_info, i));
140 if (put_user(group, grouplist+i))
147 static int groups16_from_user(struct group_info *group_info,
148 old_gid_t __user *grouplist)
153 for (i = 0; i < group_info->ngroups; i++) {
154 if (get_user(group, grouplist+i))
156 GROUP_AT(group_info, i) = low2highgid(group);
162 asmlinkage long sys_getgroups16(int gidsetsize, old_gid_t __user *grouplist)
169 get_group_info(current->group_info);
170 i = current->group_info->ngroups;
172 if (i > gidsetsize) {
176 if (groups16_to_user(grouplist, current->group_info)) {
182 put_group_info(current->group_info);
186 asmlinkage long sys_setgroups16(int gidsetsize, old_gid_t __user *grouplist)
188 struct group_info *group_info;
191 if (!capable(CAP_SETGID))
193 if ((unsigned)gidsetsize > NGROUPS_MAX)
196 group_info = groups_alloc(gidsetsize);
199 retval = groups16_from_user(group_info, grouplist);
201 put_group_info(group_info);
205 retval = set_current_groups(group_info);
206 put_group_info(group_info);
211 asmlinkage long sys_getuid16(void)
213 return high2lowuid(current->uid);
216 asmlinkage long sys_geteuid16(void)
218 return high2lowuid(current->euid);
221 asmlinkage long sys_getgid16(void)
223 return high2lowgid(current->gid);
226 asmlinkage long sys_getegid16(void)
228 return high2lowgid(current->egid);