Mike Perry writes: > So as it turns out that it is in fact possible to create a DoS condition by > requesting a truckload of shared mem, then triggering pagefaults in the entire > shared region. Mapped memory segments have been susceptible to this since at least the early days of VMS, which AFAIK was the first OS to implement mapped memory (VMS used the term "mapped section"). I ran into this by accident no later than 1982 while doing image processing on a VMS system. My processes run at the lowest possible priority (equivalent to the highest possible niceness), would effectively shut down the system until they completed. VMS didn't have a lot of tools for analyzing what was happening, but a few experiments quickly showed the culprit was page faulting. Image processing tends to step through memory sparsely. Sorry - I no longer have an exploit :) -- Dick St.Peters, stpetersat_private Gatekeeper, NetHeaven, Saratoga Springs, NY Saratoga/Albany/Amsterdam/BoltonLanding/Cobleskill/Greenwich/ GlensFalls/LakePlacid/NorthCreek/Plattsburgh/... Oldest Internet service based in the Adirondack-Albany region
This archive was generated by hypermail 2b30 : Fri Apr 13 2001 - 14:52:34 PDT