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Date: Wed, 12 Feb 2020 07:24:39 +0100 From: Dmitry Vyukov <dvyukov@...gle.com> To: Patricia Alfonso <trishalfonso@...gle.com> Cc: Jeff Dike <jdike@...toit.com>, Richard Weinberger <richard@....at>, anton.ivanov@...bridgegreys.com, Andrey Ryabinin <aryabinin@...tuozzo.com>, David Gow <davidgow@...gle.com>, Brendan Higgins <brendanhiggins@...gle.com>, linux-um@...ts.infradead.org, kasan-dev <kasan-dev@...glegroups.com>, LKML <linux-kernel@...r.kernel.org> Subject: Re: [RFC PATCH] UML: add support for KASAN under x86_64 On Wed, Feb 12, 2020 at 1:19 AM Patricia Alfonso <trishalfonso@...gle.com> wrote: > > On Thu, Jan 16, 2020 at 12:53 AM Dmitry Vyukov <dvyukov@...gle.com> wrote: > > > > > +void kasan_init(void) > > > +{ > > > + kasan_map_memory((void *)KASAN_SHADOW_START, KASAN_SHADOW_SIZE); > > > + > > > + // unpoison the kernel text which is form uml_physmem -> uml_reserved > > > + kasan_unpoison_shadow((void *)uml_physmem, physmem_size); > > > + > > > + // unpoison the vmalloc region, which is start_vm -> end_vm > > > + kasan_unpoison_shadow((void *)start_vm, (end_vm - start_vm + 1)); > > > + > > > + init_task.kasan_depth = 0; > > > + pr_info("KernelAddressSanitizer initialized\n"); > > > +} > > > > Was this tested with stack instrumentation? Stack instrumentation > > changes what shadow is being read/written and when. We don't need to > > get it working right now, but if it does not work it would be nice to > > restrict the setting and leave some comment traces for future > > generations. > If you are referring to KASAN_STACK_ENABLE, I just tested it and it > seems to work fine. I mean stack instrumentation which is enabled with CONFIG_KASAN_STACK.
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