Bugtraq mailing list archives
Re: Race conditions
From: roessler () indi5 iam uni-bonn de (Thomas Roessler)
Date: Fri, 9 Dec 94 17:45:49 +0100
From: Christopher Samuel <chris () rivers dra hmg gb> Sender: bugtraq-owner () fc net I've just checked this out with a noddy program and built the following table up (appended at the end of this post along with the program). The most suprising part of this exercise for me was that I could only find *one* OS that failed the check and created the file pointed to be the symlink! Must be the pessimist in me.. :) Notes: 1) The program was run as a normal user, not root. 2) The ls output looks like: -rw-r--r-- 1 chris cs2 359 Dec 8 13:46 tst.c lrwxrwxrwx 1 chris cs2 3 Dec 8 14:49 symlink -> ./a -rwxr-xr-x 1 chris cs2 5492 Dec 8 14:50 tst* Happy hunting, folks! Chris -- Christopher Samuel Phone: +44 1684 894644 chris () rivers dra hmg gb N-115, Defence Research Agency, St Andrews Road, Great Malvern, England, UK postmaster () rivers dra hmg gb usenet () rivers dra hmg gb ---------------------------------------------------------- BAD - creates file with "open succeded (fh=3)": HP-UX V7.05 ---------------------------------------------------------- OK - fails with "open: File exists" Ultrix 4.4 Ultrix 4.2 SunOS 4.1.3_U1 SunOS 4.1.3 SunOS 4.1.1 Solaris 2.1 Solaris 2.3 USL SVR4.2 Unixware 1.1.2 SCO 3.2 (ODT3) Irix 5.2 HP-UX 9.05 NeXTstep 3.2 DRS/NX 6000 SVR4 Version 7 Level 2 Increment 2 Linux 1.1.64
Well, irix 4.0.5f behaves bad and creates the file. Cheers, Thomas -- Student at Institute for Applied Mathematics, University of Bonn * Snail mail: Thomas Roessler, Neheimer Weg 1, 51109 Koeln, Germany * INTERNET: roessler () indi5 iam uni-bonn de * BITNET: uzs076 at dbnrhrz1.bitnet * PGP public key info via finger * http://rhein.iam.uni-bonn.de:1025/~roessler If you can't convince them, confuse them.
Current thread:
- Re: Race conditions, (continued)
- Re: Race conditions Walker Aumann (Dec 08)
- Re: Race conditions Christopher Samuel (Dec 09)
- Re: Race conditions Jason Matthews (Dec 08)
- Re: Race conditions Pat Myrto (Dec 09)
- Re: Race conditions, mkstemp Jonathan M. Bresler (Dec 10)
- Re: Race conditions, mkstemp Casper Dik (Dec 11)
- Re: Race conditions Pat Myrto (Dec 09)
- Re: Race conditions Jonathan M. Bresler (Dec 08)
- Re: Race conditions Christopher Samuel (Dec 12)
- Re: Race conditions Pat Myrto (Dec 09)