SEI CERT C Coding Standard

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changes.mady.by.user Alex Volkovitsky

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Code Block
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/*  Code intended to run with elevated privileges   */

/* Temporary Drop */
if (seteuid(getuid()) != 0) {
  /* Handle Error */
}

/*  Code intended to run with lower privileges  */ 

if (need_more_privileges) {
  /* Restore Privileges */
  if (seteuid(0) != 0) {
    /* Handle Error */
  }

  /*  Code intended to run with elevated privileges   */
}

/* ... */

/* Permanent Drop */
if (setuid(getuid()) != 0) {
  /* Handle Error */
}

/*  Code intended to run with lower privileges  */

...

Code Block
bgColor#ccccff
/*  Code intended to run with elevated privileges   */

/* Temporary Drop */
if (seteuid(getuid()) != 0) {
  /* Handle Error */
}

/*  Code intended to run with lower privileges  */ 

if (need_more_privileges) {
  /* Restore Privileges */
  if (seteuid(0) != 0) {
    /* Handle Error */
  }

  /*  Code intended to run with elevated privileges   */
}

/* ... */

/* Permanent Drop */
if (setuid(getuid()) != 0) {
  /* Handle Error */
}

if  (setuid(0) != -1) {
   /* Privileges can be restored, handle error */
}

/*  Code intended to run with lower privileges  */

...