Re: [RFC 3/4] x86/signal/64: Re-add support for SS in the 64-bit signal context

Ingo Molnar
2015-10-14T15:02:10Z

* Stas Sergeev <stsp@list.ru> wrote:

> On an off-topic: there was recently a patch from you that
> disables vm86() by mmap_min_addr. I've found that dosemu, when
> started as root, could override mmap_min_addr. I guess this will
> no longer work, right? Not a big regression, just something to
> know and document.

So I think it should still work, because we check for mmap_min_addr in the system
call itself:

static long do_sys_vm86(struct vm86plus_struct __user *user_vm86, bool plus)
{
...
err = security_mmap_addr(0);
if (err) {
/*

So if dosemu first tweaks mmap_min_addr, the syscall should succeed.

Thanks,

Ingo