uid16.c

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    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 }

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FreeBSD/Linux Kernel Cross Reference sys/kernel/uid16.c

FreeBSD/Linux Kernel Cross Reference
sys/kernel/uid16.c