/* *	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){	long ret = sys_chown(filename, low2highuid(user), low2highgid(group));	/* avoid REGPARM breakage on x86: */	asmlinkage_protect(3, ret, filename, user, group);	return ret;} SYSCALL_DEFINE3(lchown16, const char __user *, filename, old_uid_t, user, old_gid_t, group){	long ret = sys_lchown(filename, low2highuid(user), low2highgid(group));	/* avoid REGPARM breakage on x86: */	asmlinkage_protect(3, ret, filename, user, group);	return ret;} SYSCALL_DEFINE3(fchown16, unsigned int, fd, old_uid_t, user, old_gid_t, group){	long ret = sys_fchown(fd, low2highuid(user), low2highgid(group));	/* avoid REGPARM breakage on x86: */	asmlinkage_protect(3, ret, fd, user, group);	return ret;} SYSCALL_DEFINE2(setregid16, old_gid_t, rgid, old_gid_t, egid){	long ret = sys_setregid(low2highgid(rgid), low2highgid(egid));	/* avoid REGPARM breakage on x86: */	asmlinkage_protect(2, ret, rgid, egid);	return ret;} SYSCALL_DEFINE1(setgid16, old_gid_t, gid){	long ret = sys_setgid(low2highgid(gid));	/* avoid REGPARM breakage on x86: */	asmlinkage_protect(1, ret, gid);	return ret;} SYSCALL_DEFINE2(setreuid16, old_uid_t, ruid, old_uid_t, euid){	long ret = sys_setreuid(low2highuid(ruid), low2highuid(euid));	/* avoid REGPARM breakage on x86: */	asmlinkage_protect(2, ret, ruid, euid);	return ret;} SYSCALL_DEFINE1(setuid16, old_uid_t, uid){	long ret = sys_setuid(low2highuid(uid));	/* avoid REGPARM breakage on x86: */	asmlinkage_protect(1, ret, uid);	return ret;} SYSCALL_DEFINE3(setresuid16, old_uid_t, ruid, old_uid_t, euid, old_uid_t, suid){	long ret = sys_setresuid(low2highuid(ruid), low2highuid(euid),				 low2highuid(suid));	/* avoid REGPARM breakage on x86: */	asmlinkage_protect(3, ret, ruid, euid, suid);	return ret;} SYSCALL_DEFINE3(getresuid16, old_uid_t __user *, ruid, old_uid_t __user *, euid, old_uid_t __user *, suid){	const struct cred *cred = current_cred();	int retval; 	if (!(retval   = put_user(high2lowuid(cred->uid),  ruid)) &&	    !(retval   = put_user(high2lowuid(cred->euid), euid)))		retval = put_user(high2lowuid(cred->suid), suid); 	return retval;} SYSCALL_DEFINE3(setresgid16, old_gid_t, rgid, old_gid_t, egid, old_gid_t, sgid){	long ret = sys_setresgid(low2highgid(rgid), low2highgid(egid),				 low2highgid(sgid));	/* avoid REGPARM breakage on x86: */	asmlinkage_protect(3, ret, rgid, egid, sgid);	return ret;}  SYSCALL_DEFINE3(getresgid16, old_gid_t __user *, rgid, old_gid_t __user *, egid, old_gid_t __user *, sgid){	const struct cred *cred = current_cred();	int retval; 	if (!(retval   = put_user(high2lowgid(cred->gid),  rgid)) &&	    !(retval   = put_user(high2lowgid(cred->egid), egid)))		retval = put_user(high2lowgid(cred->sgid), sgid); 	return retval;} SYSCALL_DEFINE1(setfsuid16, old_uid_t, uid){	long ret = sys_setfsuid(low2highuid(uid));	/* avoid REGPARM breakage on x86: */	asmlinkage_protect(1, ret, uid);	return ret;} SYSCALL_DEFINE1(setfsgid16, old_gid_t, gid){	long ret = sys_setfsgid(low2highgid(gid));	/* avoid REGPARM breakage on x86: */	asmlinkage_protect(1, ret, gid);	return ret;} static int groups16_to_user(old_gid_t __user *grouplist,    struct group_info *group_info){	int i;	old_gid_t group; 	for (i = 0; i < group_info->ngroups; i++) {		group = high2lowgid(GROUP_AT(group_info, i));		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){	int i;	old_gid_t group; 	for (i = 0; i < group_info->ngroups; i++) {		if (get_user(group, grouplist+i))			return  -EFAULT;		GROUP_AT(group_info, i) = low2highgid(group);	} 	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 (!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(current_uid());} SYSCALL_DEFINE0(geteuid16){	return high2lowuid(current_euid());} SYSCALL_DEFINE0(getgid16){	return high2lowgid(current_gid());} SYSCALL_DEFINE0(getegid16){	return high2lowgid(current_egid());}