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/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>
17 #include <asm/uaccess.h>
19 SYSCALL_DEFINE3(chown16, const char __user *, filename, old_uid_t, user, old_gid_t, group)
21 long ret = sys_chown(filename, low2highuid(user), low2highgid(group));
22 /* avoid REGPARM breakage on x86: */
23 asmlinkage_protect(3, ret, filename, user, group);
27 SYSCALL_DEFINE3(lchown16, const char __user *, filename, old_uid_t, user, old_gid_t, group)
29 long ret = sys_lchown(filename, low2highuid(user), low2highgid(group));
30 /* avoid REGPARM breakage on x86: */
31 asmlinkage_protect(3, ret, filename, user, group);
35 SYSCALL_DEFINE3(fchown16, unsigned int, fd, old_uid_t, user, old_gid_t, group)
37 long ret = sys_fchown(fd, low2highuid(user), low2highgid(group));
38 /* avoid REGPARM breakage on x86: */
39 asmlinkage_protect(3, ret, fd, user, group);
43 SYSCALL_DEFINE2(setregid16, old_gid_t, rgid, old_gid_t, egid)
45 long ret = sys_setregid(low2highgid(rgid), low2highgid(egid));
46 /* avoid REGPARM breakage on x86: */
47 asmlinkage_protect(2, ret, rgid, egid);
51 SYSCALL_DEFINE1(setgid16, old_gid_t, gid)
53 long ret = sys_setgid(low2highgid(gid));
54 /* avoid REGPARM breakage on x86: */
55 asmlinkage_protect(1, ret, gid);
59 SYSCALL_DEFINE2(setreuid16, old_uid_t, ruid, old_uid_t, euid)
61 long ret = sys_setreuid(low2highuid(ruid), low2highuid(euid));
62 /* avoid REGPARM breakage on x86: */
63 asmlinkage_protect(2, ret, ruid, euid);
67 SYSCALL_DEFINE1(setuid16, old_uid_t, uid)
69 long ret = sys_setuid(low2highuid(uid));
70 /* avoid REGPARM breakage on x86: */
71 asmlinkage_protect(1, ret, uid);
75 SYSCALL_DEFINE3(setresuid16, old_uid_t, ruid, old_uid_t, euid, old_uid_t, suid)
77 long ret = sys_setresuid(low2highuid(ruid), low2highuid(euid),
79 /* avoid REGPARM breakage on x86: */
80 asmlinkage_protect(3, ret, ruid, euid, suid);
84 SYSCALL_DEFINE3(getresuid16, old_uid_t __user *, ruid, old_uid_t __user *, euid, old_uid_t __user *, suid)
86 const struct cred *cred = current_cred();
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);
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)
108 const struct cred *cred = current_cred();
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);
118 SYSCALL_DEFINE1(setfsuid16, old_uid_t, uid)
120 long ret = sys_setfsuid(low2highuid(uid));
121 /* avoid REGPARM breakage on x86: */
122 asmlinkage_protect(1, ret, uid);
126 SYSCALL_DEFINE1(setfsgid16, old_gid_t, gid)
128 long ret = sys_setfsgid(low2highgid(gid));
129 /* avoid REGPARM breakage on x86: */
130 asmlinkage_protect(1, ret, gid);
134 static int groups16_to_user(old_gid_t __user *grouplist,
135 struct group_info *group_info)
137 struct user_namespace *user_ns = current_user_ns();
142 for (i = 0; i < group_info->ngroups; i++) {
143 kgid = GROUP_AT(group_info, i);
144 group = high2lowgid(from_kgid_munged(user_ns, kgid));
145 if (put_user(group, grouplist+i))
152 static int groups16_from_user(struct group_info *group_info,
153 old_gid_t __user *grouplist)
155 struct user_namespace *user_ns = current_user_ns();
160 for (i = 0; i < group_info->ngroups; i++) {
161 if (get_user(group, grouplist+i))
164 kgid = make_kgid(user_ns, low2highgid(group));
165 if (!gid_valid(kgid))
168 GROUP_AT(group_info, i) = kgid;
174 SYSCALL_DEFINE2(getgroups16, int, gidsetsize, old_gid_t __user *, grouplist)
176 const struct cred *cred = current_cred();
182 i = cred->group_info->ngroups;
184 if (i > gidsetsize) {
188 if (groups16_to_user(grouplist, cred->group_info)) {
197 SYSCALL_DEFINE2(setgroups16, int, gidsetsize, old_gid_t __user *, grouplist)
199 struct group_info *group_info;
202 if (!nsown_capable(CAP_SETGID))
204 if ((unsigned)gidsetsize > NGROUPS_MAX)
207 group_info = groups_alloc(gidsetsize);
210 retval = groups16_from_user(group_info, grouplist);
212 put_group_info(group_info);
216 retval = set_current_groups(group_info);
217 put_group_info(group_info);
222 SYSCALL_DEFINE0(getuid16)
224 return high2lowuid(current_uid());
227 SYSCALL_DEFINE0(geteuid16)
229 return high2lowuid(current_euid());
232 SYSCALL_DEFINE0(getgid16)
234 return high2lowgid(current_gid());
237 SYSCALL_DEFINE0(getegid16)
239 return high2lowgid(current_egid());