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POSIX defines {{setgid()}} to have the following behavior \[[Open Group 04|AA. C References#Open Group 04]\]:

\[[Chen 02|AA. C References#Chen 02]\] "Setuid Demystified"
\[[Dowd 06|AA. C References#Dowd 06]\] Chapter 9, "UNIX I: Privileges and Files"
\[[ISO/IEC PDTR 24772|AA. C References#ISO/IEC PDTR 24772]\] "XYO Privilege Sandbox Issues"
\[[MITRE 07|AA. C References#MITRE 07]\] [CWE ID 250|http://cwe.mitre.org/data/definitions/250.html], "Execution with Unnecessary Privileges," [CWE ID 696|http://cwe.mitre.org/data/definitions/696.html], "Incorrect Behavior Order"
\[[Open Group 04|AA. C References#Open Group 04]\] [{{setuid()}}|http://www.opengroup.org/onlinepubs/009695399/functions/setuid.html], and [{{setgid()}}|http://www.opengroup.org/onlinepubs/009695399/functions/setgid.html]
\[[Tsafrir 08|AA. C References#Tsafrir 08]\] "The Murky Issue of Changing Process Identity: Revising 'Setuid Demystified'"