Re: Race conditions

[roessler () indi5 iam uni-bonn de (Thomas Roessler)]

>  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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