On Thu, Dec 17, 2009 at 11:06:13AM -0800, Russell King - ARM Linux wrote: > On Thu, Dec 17, 2009 at 10:35:17AM -0800, Joe Buck wrote: > > Besides, didn't I see a whole bunch of kernel security patches related > > to null pointer dereferences lately? If page 0 can be mapped, you > > suddenly won't get your trap. > > Page 0 can not be mapped on ARM kernels since the late 1990s, and this > protection is independent of the generic kernel. > > Milage may vary on other architectures, but that's not a concern here.
I don't understand, though, why you would want to implement a generally useful facility (make the kernel trap so you can do a post-mortem analysis) in a way that's only safe for the ARM port.
