2015-01-31 0:37 GMT+03:00 Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>: > On Fri, 30 Jan 2015 19:15:42 +0300 Andrey Ryabinin <a.ryabinin@xxxxxxxxxxx> wrote: > >> >> --- a/lib/Kconfig.kasan >> >> +++ b/lib/Kconfig.kasan >> >> @@ -5,6 +5,7 @@ if HAVE_ARCH_KASAN >> >> >> >> config KASAN >> >> bool "AddressSanitizer: runtime memory debugger" >> >> + depends on !MEMORY_HOTPLUG >> >> help >> >> Enables address sanitizer - runtime memory debugger, >> >> designed to find out-of-bounds accesses and use-after-free bugs. >> > >> > That's a significant restriction. It has obvious runtime implications. >> > It also means that `make allmodconfig' and `make allyesconfig' don't >> > enable kasan, so compile coverage will be impacted. >> > >> > This wasn't changelogged. What's the reasoning and what has to be done >> > to fix it? >> > >> >> Yes, this is runtime dependency. Hot adding memory won't work. >> Since we don't have shadow for hotplugged memory, kernel will crash on the first access to it. >> To fix this we need to allocate shadow for new memory. >> >> Perhaps it would be better to have a runtime warning instead of Kconfig dependecy? > > Is there a plan to get mem-hotplug working with kasan, btw? It doesn't > strike me as very important/urgent. Please add a sentence about this > to the changelog as well. > I don't have a strict plan for this. I could work on this, but not now -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
