On Mon, Aug 31, 2015 at 5:00 PM, Andy Lutomirski <l...@amacapital.net> wrote: > Why not just a struct? Also, why is this all tangled up in gsbase > initialization?
It has to do with the fact that the GCC stackprotector is hardcoded to look for the canary at %gs:40. Since we also use %gs for the percpu segment, we have to make sure that the canary is placed at the start of the percpu section. Overlaying it onto the bottom of the IRQ stack and was the most convenient way to do it, with a side benefit that overflowing the stack will trip the canary. -- Brian Gerst -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
