On 2015-08-21, at 11:05, Mark Zelden wrote: > >>> filesystem <uc_name>.TPLEX.ZFS >>> >> Beware also of "uc_name", which allows a nuisance (perhaps inadvertent) >> DoS attack. Prevent this with either "charcase lower" or "charcase upper" >> (or "asis_name"), at the cost of losing some flexibility in naming. >> >> (Would asis_name with DISABLE(DSNCHECK) also work?) >> > > Can you please expound on that and provide an example of how this can > be used to DoS my systems? BTW, I've seen this in many IBM examples, > manuals, presentations etc. > (And long ago, MVS-OE mentioned "charcase lower" as a preventive.)
Suppose you have "/u/mzelden". While it's unmounted I do "cd /u/MZelden". Automount issues (something like) an ENQ EXC on MZELDEN.TPLEX.ZFS. While that's in effect you can't mount "/u/mzelden". Not a DoS of your entire system, just of your HOME. (At least this applied to HFS; zFS might be different.) -- gil ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
