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

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.