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auth/as: dont pollute parents environment or namespace (thanks jrmu, sl)

--- a/sys/src/cmd/auth/as.c

+++ b/sys/src/cmd/auth/as.c

@@ -71,6 +71,9 @@

 	if(argc == 0)

 		usage();

+	/* don't pollute the parents environment / namespace */

+	rfork(RFENVG|RFNAMEG);

+

 	if(becomeuser(argv[0]) < 0)

 		sysfatal("can't change uid for %s: %r", argv[0]);

-- 

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