On Mon, 2013-12-16 at 15:12 +1100, Michael Neuling wrote: > In EXCEPTION_PROLOG_COMMON() we check to see if the stack pointer (r1) > is valid when coming from the kernel. If it's not valid, we die but > with a nice oops message. > > Currently we allocate a stack frame (subtract INT_FRAME_SIZE) before we > check to see if the stack pointer is negative. Unfortunately, this > won't detect a bad stack where r1 is less than INT_FRAME_SIZE.
The key detail being that we *expect* a negative value, because kernel addresses (0xc000000000000000) are negative. cheers _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
