/* *	Wrapper functions for 16bit uid back compatibility. All nicely tied *	together in the faint hope we can take the out in five years time. */ #include <linux/mm.h>#include <linux/mman.h>#include <linux/notifier.h>#include <linux/reboot.h>#include <linux/prctl.h>#include <linux/capability.h>#include <linux/init.h>#include <linux/highuid.h>#include <linux/security.h>#include <linux/syscalls.h> #include <asm/uaccess.h> SYSCALL_DEFINE3(chown16, const char __user *, filename, old_uid_t, user, old_gid_t, group){	return sys_chown(filename, low2highuid(user), low2highgid(group));} SYSCALL_DEFINE3(lchown16, const char __user *, filename, old_uid_t, user, old_gid_t, group){	return sys_lchown(filename, low2highuid(user), low2highgid(group));} SYSCALL_DEFINE3(fchown16, unsigned int, fd, old_uid_t, user, old_gid_t, group){	return sys_fchown(fd, low2highuid(user), low2highgid(group));} SYSCALL_DEFINE2(setregid16, old_gid_t, rgid, old_gid_t, egid){	return sys_setregid(low2highgid(rgid), low2highgid(egid));} SYSCALL_DEFINE1(setgid16, old_gid_t, gid){	return sys_setgid(low2highgid(gid));} SYSCALL_DEFINE2(setreuid16, old_uid_t, ruid, old_uid_t, euid){	return sys_setreuid(low2highuid(ruid), low2highuid(euid));} SYSCALL_DEFINE1(setuid16, old_uid_t, uid){	return sys_setuid(low2highuid(uid));} SYSCALL_DEFINE3(setresuid16, old_uid_t, ruid, old_uid_t, euid, old_uid_t, suid){	return sys_setresuid(low2highuid(ruid), low2highuid(euid),				 low2highuid(suid));} SYSCALL_DEFINE3(getresuid16, old_uid_t __user *, ruidp, old_uid_t __user *, euidp, old_uid_t __user *, suidp){	const struct cred *cred = current_cred();	int retval;	old_uid_t ruid, euid, suid; 	ruid = high2lowuid(from_kuid_munged(cred->user_ns, cred->uid));	euid = high2lowuid(from_kuid_munged(cred->user_ns, cred->euid));	suid = high2lowuid(from_kuid_munged(cred->user_ns, cred->suid)); 	if (!(retval   = put_user(ruid, ruidp)) &&	    !(retval   = put_user(euid, euidp)))		retval = put_user(suid, suidp); 	return retval;} SYSCALL_DEFINE3(setresgid16, old_gid_t, rgid, old_gid_t, egid, old_gid_t, sgid){	return sys_setresgid(low2highgid(rgid), low2highgid(egid),				 low2highgid(sgid));}  SYSCALL_DEFINE3(getresgid16, old_gid_t __user *, rgidp, old_gid_t __user *, egidp, old_gid_t __user *, sgidp){	const struct cred *cred = current_cred();	int retval;	old_gid_t rgid, egid, sgid; 	rgid = high2lowgid(from_kgid_munged(cred->user_ns, cred->gid));	egid = high2lowgid(from_kgid_munged(cred->user_ns, cred->egid));	sgid = high2lowgid(from_kgid_munged(cred->user_ns, cred->sgid)); 	if (!(retval   = put_user(rgid, rgidp)) &&	    !(retval   = put_user(egid, egidp)))		retval = put_user(sgid, sgidp); 	return retval;} SYSCALL_DEFINE1(setfsuid16, old_uid_t, uid){	return sys_setfsuid(low2highuid(uid));} SYSCALL_DEFINE1(setfsgid16, old_gid_t, gid){	return sys_setfsgid(low2highgid(gid));} static int groups16_to_user(old_gid_t __user *grouplist,    struct group_info *group_info){	struct user_namespace *user_ns = current_user_ns();	int i;	old_gid_t group;	kgid_t kgid; 	for (i = 0; i < group_info->ngroups; i++) {		kgid = GROUP_AT(group_info, i);		group = high2lowgid(from_kgid_munged(user_ns, kgid));		if (put_user(group, grouplist+i))			return -EFAULT;	} 	return 0;} static int groups16_from_user(struct group_info *group_info,    old_gid_t __user *grouplist){	struct user_namespace *user_ns = current_user_ns();	int i;	old_gid_t group;	kgid_t kgid; 	for (i = 0; i < group_info->ngroups; i++) {		if (get_user(group, grouplist+i))			return  -EFAULT; 		kgid = make_kgid(user_ns, low2highgid(group));		if (!gid_valid(kgid))			return -EINVAL; 		GROUP_AT(group_info, i) = kgid;	} 	return 0;} SYSCALL_DEFINE2(getgroups16, int, gidsetsize, old_gid_t __user *, grouplist){	const struct cred *cred = current_cred();	int i; 	if (gidsetsize < 0)		return -EINVAL; 	i = cred->group_info->ngroups;	if (gidsetsize) {		if (i > gidsetsize) {			i = -EINVAL;			goto out;		}		if (groups16_to_user(grouplist, cred->group_info)) {			i = -EFAULT;			goto out;		}	}out:	return i;} SYSCALL_DEFINE2(setgroups16, int, gidsetsize, old_gid_t __user *, grouplist){	struct group_info *group_info;	int retval; 	if (!nsown_capable(CAP_SETGID))		return -EPERM;	if ((unsigned)gidsetsize > NGROUPS_MAX)		return -EINVAL; 	group_info = groups_alloc(gidsetsize);	if (!group_info)		return -ENOMEM;	retval = groups16_from_user(group_info, grouplist);	if (retval) {		put_group_info(group_info);		return retval;	} 	retval = set_current_groups(group_info);	put_group_info(group_info); 	return retval;} SYSCALL_DEFINE0(getuid16){	return high2lowuid(from_kuid_munged(current_user_ns(), current_uid()));} SYSCALL_DEFINE0(geteuid16){	return high2lowuid(from_kuid_munged(current_user_ns(), current_euid()));} SYSCALL_DEFINE0(getgid16){	return high2lowgid(from_kgid_munged(current_user_ns(), current_gid()));} SYSCALL_DEFINE0(getegid16){	return high2lowgid(from_kgid_munged(current_user_ns(), current_egid()));}