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 #include <linux/security.h>
  16
  17 #include <asm/uaccess.h>
  18
  19 extern asmlinkage long sys_chown(const char *, uid_t,gid_t);
  20 extern asmlinkage long sys_lchown(const char *, uid_t,gid_t);
  21 extern asmlinkage long sys_fchown(unsigned int, uid_t,gid_t);
  22 extern asmlinkage long sys_setregid(gid_t, gid_t);
  23 extern asmlinkage long sys_setgid(gid_t);
  24 extern asmlinkage long sys_setreuid(uid_t, uid_t);
  25 extern asmlinkage long sys_setuid(uid_t);
  26 extern asmlinkage long sys_setresuid(uid_t, uid_t, uid_t);
  27 extern asmlinkage long sys_setresgid(gid_t, gid_t, gid_t);
  28 extern asmlinkage long sys_setfsuid(uid_t);
  29 extern asmlinkage long sys_setfsgid(gid_t);
  30
  31 asmlinkage long sys_chown16(const char * filename, old_uid_t user, old_gid_t group)
  32 {
  33         return sys_chown(filename, low2highuid(user), low2highgid(group));
  34 }
  35
  36 asmlinkage long sys_lchown16(const char * filename, old_uid_t user, old_gid_t group)
  37 {
  38         return sys_lchown(filename, low2highuid(user), low2highgid(group));
  39 }
  40
  41 asmlinkage long sys_fchown16(unsigned int fd, old_uid_t user, old_gid_t group)
  42 {
  43         return sys_fchown(fd, low2highuid(user), low2highgid(group));
  44 }
  45
  46 asmlinkage long sys_setregid16(old_gid_t rgid, old_gid_t egid)
  47 {
  48         return sys_setregid(low2highgid(rgid), low2highgid(egid));
  49 }
  50
  51 asmlinkage long sys_setgid16(old_gid_t gid)
  52 {
  53         return sys_setgid((gid_t)gid);
  54 }
  55
  56 asmlinkage long sys_setreuid16(old_uid_t ruid, old_uid_t euid)
  57 {
  58         return sys_setreuid(low2highuid(ruid), low2highuid(euid));
  59 }
  60
  61 asmlinkage long sys_setuid16(old_uid_t uid)
  62 {
  63         return sys_setuid((uid_t)uid);
  64 }
  65
  66 asmlinkage long sys_setresuid16(old_uid_t ruid, old_uid_t euid, old_uid_t suid)
  67 {
  68         return sys_setresuid(low2highuid(ruid), low2highuid(euid),
  69                 low2highuid(suid));
  70 }
  71
  72 asmlinkage long sys_getresuid16(old_uid_t *ruid, old_uid_t *euid, old_uid_t *suid)
  73 {
  74         int retval;
  75
  76         if (!(retval = put_user(high2lowuid(current->uid), ruid)) &&
  77             !(retval = put_user(high2lowuid(current->euid), euid)))
  78                 retval = put_user(high2lowuid(current->suid), suid);
  79
  80         return retval;
  81 }
  82
  83 asmlinkage long sys_setresgid16(old_gid_t rgid, old_gid_t egid, old_gid_t sgid)
  84 {
  85         return sys_setresgid(low2highgid(rgid), low2highgid(egid),
  86                 low2highgid(sgid));
  87 }
  88
  89 asmlinkage long sys_getresgid16(old_gid_t *rgid, old_gid_t *egid, old_gid_t *sgid)
  90 {
  91         int retval;
  92
  93         if (!(retval = put_user(high2lowgid(current->gid), rgid)) &&
  94             !(retval = put_user(high2lowgid(current->egid), egid)))
  95                 retval = put_user(high2lowgid(current->sgid), sgid);
  96
  97         return retval;
  98 }
  99
 100 asmlinkage long sys_setfsuid16(old_uid_t uid)
 101 {
 102         return sys_setfsuid((uid_t)uid);
 103 }
 104
 105 asmlinkage long sys_setfsgid16(old_gid_t gid)
 106 {
 107         return sys_setfsgid((gid_t)gid);
 108 }
 109
 110 asmlinkage long sys_getgroups16(int gidsetsize, old_gid_t *grouplist)
 111 {
 112         old_gid_t groups[NGROUPS];
 113         int i,j;
 114
 115         if (gidsetsize < 0)
 116                 return -EINVAL;
 117         i = current->ngroups;
 118         if (gidsetsize) {
 119                 if (i > gidsetsize)
 120                         return -EINVAL;
 121                 for(j=0;j<i;j++)
 122                         groups[j] = current->groups[j];
 123                 if (copy_to_user(grouplist, groups, sizeof(old_gid_t)*i))
 124                         return -EFAULT;
 125         }
 126         return i;
 127 }
 128
 129 asmlinkage long sys_setgroups16(int gidsetsize, old_gid_t *grouplist)
 130 {
 131         old_gid_t groups[NGROUPS];
 132         gid_t new_groups[NGROUPS];
 133         int i;
 134
 135         if (!capable(CAP_SETGID))
 136                 return -EPERM;
 137         if ((unsigned) gidsetsize > NGROUPS)
 138                 return -EINVAL;
 139         if (copy_from_user(groups, grouplist, gidsetsize * sizeof(old_gid_t)))
 140                 return -EFAULT;
 141         for (i = 0 ; i < gidsetsize ; i++)
 142                 new_groups[i] = (gid_t)groups[i];
 143         i = security_ops->task_setgroups(gidsetsize, new_groups);
 144         if (i)
 145                 return i;
 146         memcpy(current->groups, new_groups, gidsetsize * sizeof(gid_t));
 147         current->ngroups = gidsetsize;
 148         return 0;
 149 }
 150
 151 asmlinkage long sys_getuid16(void)
 152 {
 153         return high2lowuid(current->uid);
 154 }
 155
 156 asmlinkage long sys_geteuid16(void)
 157 {
 158         return high2lowuid(current->euid);
 159 }
 160
 161 asmlinkage long sys_getgid16(void)
 162 {
 163         return high2lowgid(current->gid);
 164 }
 165
 166 asmlinkage long sys_getegid16(void)
 167 {
 168         return high2lowgid(current->egid);
 169 }