Date: Thu, 18 Apr 2002 13:50:31 -0700 (PDT) From: Thomas Cannon <tcannon@noops.org> To: Ceri Davies <setantae@submonkey.net> Cc: <freebsd-questions@FreeBSD.ORG>, <security-officer@freebsd.org> Subject: Re: I think this could be better Message-ID: <20020418134824.E5528-100000@stereophonic.noops.org> In-Reply-To: <20020418203742.GA10603@submonkey.net>
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> While you're probably right to be concerned at use of a PID as a temporary
> filename, in this instance I'm not sure it's so terrible :
>
> {setantae@rhadamanth}-{/tmp} $ ln -s /etc.old/passwd install.35223
> {setantae@rhadamanth}-{/tmp} # ls -l
> total 154
> -r--r--r-- 1 root wheel 11 Apr 18 17:00 .X0-lock
> drwxrwxrwt 2 root wheel 512 Apr 18 17:00 .X11-unix
> -rw-r--r-- 1 setantae wheel 149989 Apr 18 21:03 foo
> lrwxr-xr-x 1 setantae wheel 15 Apr 18 21:26 install.35223 -> /etc.old/passwd
> -rw-r--r-- 1 rasputin wheel 37 Apr 18 17:24 wtf
> {setantae@rhadamanth}-{/tmp} $ su
> Password:
> {root@rhadamanth}-{/tmp} # mkdir -p install.35223
> mkdir: install.35223: Permission denied
True, true... but instead of linking a file and then having the mkdir
clobber it, just make a dir and put links in it. Then things go bad.
"mkdir -p" won't fail (or even complain) if the directory already exists:
[tcannon@stereophonic]$ mkdir -p foo
[tcannon@stereophonic]$ sudo su
[root@stereophonic]# mkdir -p foo
[root@stereophonic]#
Cheers,
-tcannon
--
Thomas Cannon, CISSP, FNCNE, CCDP, CCNP, SCSA, SCNA, CCDP, CCNA
Unified Computing (415) 533-5294
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