Re: Race conditions
Thomas Roessler (roessler@indi5.iam.uni-bonn.de)
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
--
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If you can't convince them, confuse them.