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
  18 extern asmlinkage long sys_chown(const char *, uid_t,gid_t);
  19 extern asmlinkage long sys_lchown(const char *, uid_t,gid_t);
  20 extern asmlinkage long sys_fchown(unsigned int, uid_t,gid_t);
  21 extern asmlinkage long sys_setregid(gid_t, gid_t);
  22 extern asmlinkage long sys_setgid(gid_t);
  23 extern asmlinkage long sys_setreuid(uid_t, uid_t);
  24 extern asmlinkage long sys_setuid(uid_t);
  25 extern asmlinkage long sys_setresuid(uid_t, uid_t, uid_t);
  26 extern asmlinkage long sys_setresgid(gid_t, gid_t, gid_t);
  27 extern asmlinkage long sys_setfsuid(uid_t);
  28 extern asmlinkage long sys_setfsgid(gid_t);
  29
  30 asmlinkage 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
  35 asmlinkage 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
  40 asmlinkage 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
  45 asmlinkage long sys_setregid16(old_gid_t rgid, old_gid_t egid)
  46 {
  47         return sys_setregid(low2highgid(rgid), low2highgid(egid));
  48 }
  49
  50 asmlinkage long sys_setgid16(old_gid_t gid)
  51 {
  52         return sys_setgid((gid_t)gid);
  53 }
  54
  55 asmlinkage long sys_setreuid16(old_uid_t ruid, old_uid_t euid)
  56 {
  57         return sys_setreuid(low2highuid(ruid), low2highuid(euid));
  58 }
  59
  60 asmlinkage long sys_setuid16(old_uid_t uid)
  61 {
  62         return sys_setuid((uid_t)uid);
  63 }
  64
  65 asmlinkage 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
  71 asmlinkage 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
  82 asmlinkage 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
  88 asmlinkage 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
  99 asmlinkage long sys_setfsuid16(old_uid_t uid)
 100 {
 101         return sys_setfsuid((uid_t)uid);
 102 }
 103
 104 asmlinkage long sys_setfsgid16(old_gid_t gid)
 105 {
 106         return sys_setfsgid((gid_t)gid);
 107 }
 108
 109 asmlinkage 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
 128 asmlinkage 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
 145 asmlinkage long sys_getuid16(void)
 146 {
 147         return high2lowuid(current->uid);
 148 }
 149
 150 asmlinkage long sys_geteuid16(void)
 151 {
 152         return high2lowuid(current->euid);
 153 }
 154
 155 asmlinkage long sys_getgid16(void)
 156 {
 157         return high2lowgid(current->gid);
 158 }
 159
 160 asmlinkage long sys_getegid16(void)
 161 {
 162         return high2lowgid(current->egid);
 163 }