svn commit: r243328 - head/lib/libutil
Baptiste Daroussin
bapt at FreeBSD.org
Tue Nov 20 12:43:12 UTC 2012
On Tue, Nov 20, 2012 at 02:22:26PM +0200, Jaakko Heinonen wrote:
>
> Hi!
>
> On 2012-11-20, Baptiste Daroussin wrote:
> > change mode the group file to 0644 after a successfull rename(2)
> >
> > int
> > gr_mkdb(void)
> > {
> > - return (rename(tempname, group_file));
> > + int ret;
> > +
> > + ret = rename(tempname, group_file);
> > +
> > + if (ret == 0)
> > + chmod(group_file, 0644);
> > +
> > + return (ret);
> > }
>
> Rename+chmod is not an atomic operation. There is a window when the file
> has wrong permissions. Also, you don't check the return value of
> chmod(). Maybe chmod first and then rename?
>
> --
> Jaakko
Yes you are right chmod should probably be first.
regards,
Bapt
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