LXR linux-old/kernel/uid16.c

   1/*
   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.
   4 */
   5
   6#include <linux/mm.h>
   7#include <linux/utsname.h>
   8#include <linux/mman.h>
   9#include <linux/smp_lock.h>
  10#include <linux/notifier.h>
  11#include <linux/reboot.h>
  12#include <linux/prctl.h>
  13#include <linux/init.h>
  14#include <linux/highuid.h>
  15
  16#include <asm/uaccess.h>
  17
  18extern asmlinkage long sys_chown(const char *, uid_t,gid_t);
  19extern asmlinkage long sys_lchown(const char *, uid_t,gid_t);
  20extern asmlinkage long sys_fchown(unsigned int, uid_t,gid_t);
  21extern asmlinkage long sys_setregid(gid_t, gid_t);
  22extern asmlinkage long sys_setgid(gid_t);
  23extern asmlinkage long sys_setreuid(uid_t, uid_t);
  24extern asmlinkage long sys_setuid(uid_t);
  25extern asmlinkage long sys_setresuid(uid_t, uid_t, uid_t);
  26extern asmlinkage long sys_setresgid(gid_t, gid_t, gid_t);
  27extern asmlinkage long sys_setfsuid(uid_t);
  28extern asmlinkage long sys_setfsgid(gid_t);
  29 
  30asmlinkage long sys_chown16(const char * filename, old_uid_t user, old_gid_t group)
  31{
  32        return sys_chown(filename, low2highuid(user), low2highgid(group));
  33}
  34
  35asmlinkage long sys_lchown16(const char * filename, old_uid_t user, old_gid_t group)
  36{
  37        return sys_lchown(filename, low2highuid(user), low2highgid(group));
  38}
  39
  40asmlinkage long sys_fchown16(unsigned int fd, old_uid_t user, old_gid_t group)
  41{
  42        return sys_fchown(fd, low2highuid(user), low2highgid(group));
  43}
  44
  45asmlinkage long sys_setregid16(old_gid_t rgid, old_gid_t egid)
  46{
  47        return sys_setregid(low2highgid(rgid), low2highgid(egid));
  48}
  49
  50asmlinkage long sys_setgid16(old_gid_t gid)
  51{
  52        return sys_setgid((gid_t)gid);
  53}
  54
  55asmlinkage long sys_setreuid16(old_uid_t ruid, old_uid_t euid)
  56{
  57        return sys_setreuid(low2highuid(ruid), low2highuid(euid));
  58}
  59
  60asmlinkage long sys_setuid16(old_uid_t uid)
  61{
  62        return sys_setuid((uid_t)uid);
  63}
  64
  65asmlinkage long sys_setresuid16(old_uid_t ruid, old_uid_t euid, old_uid_t suid)
  66{
  67        return sys_setresuid(low2highuid(ruid), low2highuid(euid),
  68                low2highuid(suid));
  69}
  70
  71asmlinkage long sys_getresuid16(old_uid_t *ruid, old_uid_t *euid, old_uid_t *suid)
  72{
  73        int retval;
  74
  75        if (!(retval = put_user(high2lowuid(current->uid), ruid)) &&
  76            !(retval = put_user(high2lowuid(current->euid), euid)))
  77                retval = put_user(high2lowuid(current->suid), suid);
  78
  79        return retval;
  80}
  81
  82asmlinkage long sys_setresgid16(old_gid_t rgid, old_gid_t egid, old_gid_t sgid)
  83{
  84        return sys_setresgid(low2highgid(rgid), low2highgid(egid),
  85                low2highgid(sgid));
  86}
  87
  88asmlinkage long sys_getresgid16(old_gid_t *rgid, old_gid_t *egid, old_gid_t *sgid)
  89{
  90        int retval;
  91
  92        if (!(retval = put_user(high2lowgid(current->gid), rgid)) &&
  93            !(retval = put_user(high2lowgid(current->egid), egid)))
  94                retval = put_user(high2lowgid(current->sgid), sgid);
  95
  96        return retval;
  97}
  98
  99asmlinkage long sys_setfsuid16(old_uid_t uid)
 100{
 101        return sys_setfsuid((uid_t)uid);
 102}
 103
 104asmlinkage long sys_setfsgid16(old_gid_t gid)
 105{
 106        return sys_setfsgid((gid_t)gid);
 107}
 108
 109asmlinkage long sys_getgroups16(int gidsetsize, old_gid_t *grouplist)
 110{
 111        old_gid_t groups[NGROUPS];
 112        int i,j;
 113
 114        if (gidsetsize < 0)
 115                return -EINVAL;
 116        i = current->ngroups;
 117        if (gidsetsize) {
 118                if (i > gidsetsize)
 119                        return -EINVAL;
 120                for(j=0;j<i;j++)
 121                        groups[j] = current->groups[j];
 122                if (copy_to_user(grouplist, groups, sizeof(old_gid_t)*i))
 123                        return -EFAULT;
 124        }
 125        return i;
 126}
 127
 128asmlinkage long sys_setgroups16(int gidsetsize, old_gid_t *grouplist)
 129{
 130        old_gid_t groups[NGROUPS];
 131        int i;
 132
 133        if (!capable(CAP_SETGID))
 134                return -EPERM;
 135        if ((unsigned) gidsetsize > NGROUPS)
 136                return -EINVAL;
 137        if (copy_from_user(groups, grouplist, gidsetsize * sizeof(old_gid_t)))
 138                return -EFAULT;
 139        for (i = 0 ; i < gidsetsize ; i++)
 140                current->groups[i] = (gid_t)groups[i];
 141        current->ngroups = gidsetsize;
 142        return 0;
 143}
 144
 145asmlinkage long sys_getuid16(void)
 146{
 147        return high2lowuid(current->uid);
 148}
 149
 150asmlinkage long sys_geteuid16(void)
 151{
 152        return high2lowuid(current->euid);
 153}
 154
 155asmlinkage long sys_getgid16(void)
 156{
 157        return high2lowgid(current->gid);
 158}
 159
 160asmlinkage long sys_getegid16(void)
 161{
 162        return high2lowgid(current->egid);
 163}
 164