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/*

 *      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/utsname.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>

asmlinkage long sys_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: */

        prevent_tail_call(ret);

        return ret;

}

asmlinkage long sys_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: */

        prevent_tail_call(ret);

        return ret;

}

asmlinkage long sys_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: */

        prevent_tail_call(ret);

        return ret;

}

asmlinkage long sys_setregid16(old_gid_t rgid, old_gid_t egid)

{

        long ret = sys_setregid(low2highgid(rgid), low2highgid(egid));

        /* avoid REGPARM breakage on x86: */

        prevent_tail_call(ret);

        return ret;

}

asmlinkage long sys_setgid16(old_gid_t gid)

{

        long ret = sys_setgid(low2highgid(gid));

        /* avoid REGPARM breakage on x86: */

        prevent_tail_call(ret);

        return ret;

}

asmlinkage long sys_setreuid16(old_uid_t ruid, old_uid_t euid)

{

        long ret = sys_setreuid(low2highuid(ruid), low2highuid(euid));

        /* avoid REGPARM breakage on x86: */

        prevent_tail_call(ret);

        return ret;

}

asmlinkage long sys_setuid16(old_uid_t uid)

{

        long ret = sys_setuid(low2highuid(uid));

        /* avoid REGPARM breakage on x86: */

        prevent_tail_call(ret);

        return ret;

}

asmlinkage long sys_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: */

        prevent_tail_call(ret);

        return ret;

}

asmlinkage long sys_getresuid16(old_uid_t __user *ruid, old_uid_t __user *euid, old_uid_t __user *suid)

{

        int retval;

        if (!(retval = put_user(high2lowuid(current->uid), ruid)) &&

            !(retval = put_user(high2lowuid(current->euid), euid)))

                retval = put_user(high2lowuid(current->suid), suid);

        return retval;

}

asmlinkage long sys_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: */

        prevent_tail_call(ret);

        return ret;

}

asmlinkage long sys_getresgid16(old_gid_t __user *rgid, old_gid_t __user *egid, old_gid_t __user *sgid)

{

        int retval;

        if (!(retval = put_user(high2lowgid(current->gid), rgid)) &&

            !(retval = put_user(high2lowgid(current->egid), egid)))

                retval = put_user(high2lowgid(current->sgid), sgid);

        return retval;

}

asmlinkage long sys_setfsuid16(old_uid_t uid)

{

        long ret = sys_setfsuid(low2highuid(uid));

        /* avoid REGPARM breakage on x86: */

        prevent_tail_call(ret);

        return ret;

}

asmlinkage long sys_setfsgid16(old_gid_t gid)

{

        long ret = sys_setfsgid(low2highgid(gid));

        /* avoid REGPARM breakage on x86: */

        prevent_tail_call(ret);

        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;

}

asmlinkage long sys_getgroups16(int gidsetsize, old_gid_t __user *grouplist)

{

        int i = 0;

        if (gidsetsize < 0)

                return -EINVAL;

        get_group_info(current->group_info);

        i = current->group_info->ngroups;

        if (gidsetsize) {

                if (i > gidsetsize) {

                        i = -EINVAL;

                        goto out;

                }

                if (groups16_to_user(grouplist, current->group_info)) {

                        i = -EFAULT;

                        goto out;

                }

        }

out:

        put_group_info(current->group_info);

        return i;

}

asmlinkage long sys_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;

}

asmlinkage long sys_getuid16(void)

{

        return high2lowuid(current->uid);

}

asmlinkage long sys_geteuid16(void)

{

        return high2lowuid(current->euid);

}

asmlinkage long sys_getgid16(void)

{

        return high2lowgid(current->gid);

}

asmlinkage long sys_getegid16(void)

{

        return high2lowgid(current->egid);

}