Current-Users archive

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Old Index]

Re: sysutils/vbetools not working anymore

Joerg Sonnenberger <> schrieb:
> Mapping of NULL was explicitly disable by default on platforms with
> shared kernel / userland address space.  This makes it harder to exploit
> NULL function pointer dereferences in the kernel as shown a few years
> ago during the CCC congress for OpenBSD.  There is a sysctl or kernel
> option to reenable it, but I forgot the name.

Ah, you're right. For the record, it's vm.user_va0_disable. Thanks!

Dennis den Brok

Home | Main Index | Thread Index | Old Index