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auth(8): specify what gets put into the environemnt with '-s'

Understanding the environment is important for security critical
applications.

--- a/sys/man/8/auth

+++ b/sys/man/8/auth

@@ -298,8 +298,16 @@

 flag specifies a string of driver

 characters to keep. The

 .B -s

-flag initializes the namespace to what rc expects,

-and passes its arguments unmodified to /bin/rc.

+flag initializes the namespace to an environment which includes

+.IR /bin ,

+.IR /srv ,

+.IR /env ,

+.IR /rc ,

+adds the

+.I |d

+devices, and execs

+.IR /bin/rc ,

+passing all arguments as though rc was invoked directly.

 .PP

 .I As

 executes