From owner-freebsd-bugs  Fri Dec 27 01:30:03 1996
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Date: Fri, 27 Dec 1996 01:30:01 -0800 (PST)
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From: Matthew Dillon <dillon@backplane.com>
Subject: Re: bin/2291: Race condition in pw_lock (vipw, chpass, etc....)
Reply-To: Matthew Dillon <dillon@backplane.com>
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The following reply was made to PR bin/2291; it has been noted by GNATS.

From: Matthew Dillon <dillon@backplane.com>
To: joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch)
Cc: FreeBSD-gnats-submit@freebsd.org
Subject: Re: bin/2291: Race condition in pw_lock (vipw, chpass, etc....)
Date: Fri, 27 Dec 1996 01:21:07 -0800 (PST)

 :
 :Why not using the O_EXLOCK flag in open(2)?
 :
 :-- 
 :cheers, J"org
 :
 :joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE
 :Never trust an operating system you don't have sources for. ;-)
 
     I don't think O_EXLOCK avoids the rename()-over race condition... you
     still have to do the stat()/fstat() check afterwords.
 
 					-Matt
 
     Matthew Dillon   Engineering, BEST Internet Communications, Inc.
 		     <dillon@apollo.backplane.com>
     [always include a portion of the original email in any response!]