[PATCH v15 05/17] arms64: untag user pointers passed to memory syscalls

[Catalin Marinas]

On Mon, May 06, 2019 at 06:30:51PM +0200, Andrey Konovalov wrote:
> +SYSCALL_DEFINE5(arm64_get_mempolicy, int __user *, policy,
> +		unsigned long __user *, nmask, unsigned long, maxnode,
> +		unsigned long, addr, unsigned long, flags)
> +{
> +	addr = untagged_addr(addr);
> +	return ksys_get_mempolicy(policy, nmask, maxnode, addr, flags);
> +}
[...]
> +SYSCALL_DEFINE6(arm64_mbind, unsigned long, start, unsigned long, len,
> +		unsigned long, mode, const unsigned long __user *, nmask,
> +		unsigned long, maxnode, unsigned int, flags)
> +{
> +	start = untagged_addr(start);
> +	return ksys_mbind(start, len, mode, nmask, maxnode, flags);
> +}

The kernel fails to build with CONFIG_NUMA disabled because the above
are in mm/mempolicy.c which is no longer compiled in.

-- 
Catalin