Re: [PATCH v4 07/15] mm/execmem, arch: convert remaining overrides of module_alloc to execmem

[Peter Zijlstra <peterz@xxxxxxxxxxxxx>]

On Thu, Apr 11, 2024 at 07:00:43PM +0300, Mike Rapoport wrote:

> +static struct execmem_info execmem_info __ro_after_init = {
> +	.ranges = {
> +		[EXECMEM_DEFAULT] = {
> +			.flags = EXECMEM_KASAN_SHADOW,
> +			.alignment = MODULE_ALIGN,
> +		},
> +	},
> +};
>  
> +struct execmem_info __init *execmem_arch_setup(void)
>  {
> +	unsigned long start, offset = 0;
>  
> +	if (kaslr_enabled())
> +		offset = get_random_u32_inclusive(1, 1024) * PAGE_SIZE;
>  
> +	start = MODULES_VADDR + offset;
> +	execmem_info.ranges[EXECMEM_DEFAULT].start = start;
> +	execmem_info.ranges[EXECMEM_DEFAULT].end = MODULES_END;
> +	execmem_info.ranges[EXECMEM_DEFAULT].pgprot = PAGE_KERNEL;
>  
> +	return &execmem_info;
>  }

struct execmem_info __init *execmem_arch_setup(void)
{
	unsigned long offset = 0;

	if (kaslr_enabled())
		offset = get_random_u32_inclusive(1, 1024) * PAGE_SIZE;

	execmem_info = (struct execmem_info){
		.ranges = {
			[EXECMEM_DEFAULT] = {
				.start     = MODULES_VADDR + offset,
				.end       = MODULES_END,
				.pgprot    = PAGE_KERNEL,
				.flags     = EXECMEM_KASAN_SHADOW,
				.alignment = 1,
			},
		},
	};

	return &execmem_info;
}