Messages in this thread | | | From | Linus Walleij <> | Date | Wed, 31 Aug 2022 11:30:53 +0200 | Subject | Re: [PATCH] ARM: kasan: Only map modules if CONFIG_KASAN_VMALLOC=n |
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On Sat, Aug 27, 2022 at 11:32 PM Alexander A Sverdlin <alexander.sverdlin@nokia.com> wrote:
> - create_mapping((void *)MODULES_VADDR, (void *)(PKMAP_BASE + PMD_SIZE)); > + if (!IS_ENABLED(CONFIG_KASAN_VMALLOC) && IS_ENABLED(CONFIG_MODULES)) > + create_mapping((void *)MODULES_VADDR, (void *)(MODULES_END));
So the way I understand it is that modules are first and foremost loaded into the area MODULES_VADDR .. MODULES_END, and then after that is out, they get loaded into VMALLOC. See arch/arm/kernel/module.c, module_alloc().
If you do this, how are the addresses between MODULES_VADDR..MODULES_END shadowed when using CONFIG_KASAN_VMALLOC?
> + create_mapping((void *)PKMAP_BASE, (void *)(PKMAP_BASE + PMD_SIZE));
(Splitting this in two steps if probably good in any case.)
Pls keep me on CC for Kasan ARM patches, thanks! (Maybe I should add some MAINTAINERS blurb.)
Yours, Linus Walleij
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