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

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Message-ID: <20151014150155.GA21330@gmail.com>
Date:	Wed, 14 Oct 2015 17:01:55 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Stas Sergeev <stsp@...t.ru>
Cc:	Andy Lutomirski <luto@...nel.org>, x86@...nel.org,
	linux-kernel@...r.kernel.org, Brian Gerst <brgerst@...il.com>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Borislav Petkov <bp@...en8.de>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	Pavel Emelyanov <xemul@...allels.com>
Subject: Re: [RFC 3/4] x86/signal/64: Re-add support for SS in the 64-bit
 signal context


* Stas Sergeev <stsp@...t.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
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