SEI CERT C Coding Standard

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Old Version 27

changes.mady.by.user Gina DeCola

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New Version 28

changes.mady.by.user Robert Seacord

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Code Block
bgColor#ccccff
/*  Drop superuser privileges in correct order */

if (setgid(getgid()) == -1) {
  /* handle error condition */
}
if (setuid(getuid()) == -1) {
  /* handle error condition */
}

/*
 *  Not possible to regain group privileges due to correct
 * relinquishment order  
 */

Risk Assessment

Failing to observe the correct revocation order while relinquishing privileges can result in unintended privilege escalation.

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