Should UID 0 or GID 0 have a special meaning in RTEMS?

[Sebastian Huber]

Hello,

I work currently with the RTEMS file system subsystem.  I want to unify the 
access checks.  The question is if UID 0 or GID 0 should have a special meaning 
in RTEMS?

Do we want this

bool rtems_filesystem_check_access(
   int eval_flags,
   mode_t node_mode,
   uid_t node_uid,
   gid_t node_gid
)
{
   mode_t perm_flags = eval_flags & RTEMS_LIBIO_PERMS_RWX;
   uid_t task_uid = geteuid();

   if (task_uid == 0 || task_uid == node_uid) {
     perm_flags <<= 6;
   } else {
     gid_t task_gid = getegid();

     if (task_gid == 0 || task_gid == node_gid) {
       perm_flags <<= 3;
     } else {
       perm_flags <<= 0;
     }
   }

   return (perm_flags & node_mode) == perm_flags;
}

or this

bool rtems_filesystem_check_access(
   int eval_flags,
   mode_t node_mode,
   uid_t node_uid,
   gid_t node_gid
)
{
   mode_t perm_flags = eval_flags & RTEMS_LIBIO_PERMS_RWX;

   if (geteuid() == node_uid) {
     perm_flags <<= 6;
   } else if (getegid() == node_gid) {
     perm_flags <<= 3;
   } else {
     perm_flags <<= 0;
   }

   return (perm_flags & node_mode) == perm_flags;
}

?

-- 
Sebastian Huber, embedded brains GmbH

Address : Obere Lagerstr. 30, D-82178 Puchheim, Germany
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E-Mail  : sebastian.huber at embedded-brains.de
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