Re: [RFC] Bug in mkdir(2)
Peter Benie (pjb1008@cam.ac.uk)
Thu, 17 Jun 1999 10:24:21 +0100
Wolfgang Walter writes ("Re: [RFC] Bug in mkdir(2)"):
> On Wed, Jun 16, 1999 at 10:11:00PM +0100, Alan Cox wrote:
> >
> > You can demonstrate the link following race for O_EXCL|O_CREAT is insoluble.
>
> Yes. But it is possible to reduce it to a practical minimal risk by using
> a long enough really random filename and if this succeeds, to rename it to
> the wished name.
Using directories in /tmp is a common way for portable shell scripts
to create temporary files safely. A portable shell script cannot use
mktemp or noclobber, and I really don't want to have to implement a
cryptographically strong RNG in shell script!
Peter
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