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SubjectRe: [PATCH v6 16/18] khwasan, mm, arm64: tag non slab memory allocated via pagealloc
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On 08/29/2018 02:35 PM, Andrey Konovalov wrote:

> void kasan_poison_slab(struct page *page)
> {
> + unsigned long i;
> +
> + if (IS_ENABLED(CONFIG_SLAB))
> + page->s_mem = reset_tag(page->s_mem);

Why reinitialize here, instead of single initialization in alloc_slabmgmt()?


> + for (i = 0; i < (1 << compound_order(page)); i++)
> + page_kasan_tag_reset(page + i);
> kasan_poison_shadow(page_address(page),
> PAGE_SIZE << compound_order(page),
> KASAN_KMALLOC_REDZONE);

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