On Mon, Aug 31, 2015 at 2:47 PM, Brian Gerst <brge...@gmail.com> wrote: > 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.
Would a struct not make more sense, then? --Andy > > -- > Brian Gerst -- Andy Lutomirski AMA Capital Management, LLC -- 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/
