linux-kernel - Re: [PATCH] kasan: support vmalloc backing of vm_map

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Date:   Wed, 4 Dec 2019 23:44:29 +0300
From:   Andrey Ryabinin <aryabinin@...tuozzo.com>
To:     Daniel Axtens <dja@...ens.net>, kasan-dev@...glegroups.com,
        linux-mm@...ck.org, x86@...nel.org, glider@...gle.com,
        linux-kernel@...r.kernel.org, dvyukov@...gle.com
Cc:     Qian Cai <cai@....pw>
Subject: Re: [PATCH] kasan: support vmalloc backing of vm_map_ram()



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;
>