On Mon, Apr 22, 2024 at 02:48:56PM +0200, Geert Uytterhoeven wrote: > On Mon, Apr 22, 2024 at 1:54 PM Jason Gunthorpe <jgg@xxxxxxxxxx> wrote: > > On Mon, Apr 22, 2024 at 09:27:18AM +0200, Geert Uytterhoeven wrote: > > > > +if IOMMUFD > > > > +config IOMMUFD_TEST > > > > + bool "IOMMU Userspace API Test support" > > > > + depends on DEBUG_KERNEL > > > > + depends on FAULT_INJECTION > > > > + depends on RUNTIME_TESTING_MENU > > > > + default n > > > > + help > > > > + This is dangerous, do not enable unless running > > > > + tools/testing/selftests/iommu > > > > +endif > > > > > > How dangerous is this? > > > I.e. is it now unsafe to run an allyesconfig or allmodconfig kernel? > > > > Depends what you mean by unsafe? This is less unsafe than /dev/mem, > > for instance.. It does nothing unless poked by userspace. > > OK, so the test itself does not cause a crash, or data corruption? No, it just provides a bunch of ioctls that could be abused by userspace to do some slightly bad stuff. Jason
