Re: [PATCH] kasan: support vmalloc backing of vm_map_ram()

[Andrey Ryabinin]

On 11/29/19 6:45 PM, Daniel Axtens wrote:
> @@ -1826,7 +1842,15 @@ void *vm_map_ram(struct page **pages, unsigned int count, int node, pgprot_t pro
>  
>  		addr = va->va_start;
>  		mem = (void *)addr;
> +
> +		if (kasan_populate_vmalloc_area(size, mem)) {
> +			vm_unmap_ram(mem, count);
> +			return NULL;
> +		}
>  	}
> +
> +	kasan_unpoison_shadow(mem, size);
> +

This probably gonna explode on CONFIG_KASAN=y && CONFIG_KASAN_VMALLOC=n

I've sent alternative patch which fixes vm_map_ram() and also makes the code a bit easier to follow in my opinion.

>  	if (vmap_page_range(addr, addr + size, prot, pages) < 0) {
>  		vm_unmap_ram(mem, count);
>  		return NULL;
>