From: Ingo Molnar <mingo@kernel.org>
To: Stas Sergeev <stsp@list.ru>
Cc: Andy Lutomirski <luto@kernel.org>,
x86@kernel.org, linux-kernel@vger.kernel.org,
Brian Gerst <brgerst@gmail.com>,
Denys Vlasenko <dvlasenk@redhat.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Borislav Petkov <bp@alien8.de>,
Cyrill Gorcunov <gorcunov@gmail.com>,
Pavel Emelyanov <xemul@parallels.com>
Subject: Re: [RFC 3/4] x86/signal/64: Re-add support for SS in the 64-bit signal context
Date: Wed, 14 Oct 2015 17:01:55 +0200 [thread overview]
Message-ID: <20151014150155.GA21330@gmail.com> (raw)
In-Reply-To: <561D1C53.8080302@list.ru>
* 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
next prev parent reply other threads:[~2015-10-14 15:02 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-13 1:04 [RFC 0/4] x86: sigcontext SS fixes, take 2 Andy Lutomirski
2015-10-13 1:04 ` [RFC 1/4] x86/signal/64: Add a comment about sigcontext->fs and gs Andy Lutomirski
2015-10-13 1:04 ` [RFC 2/4] x86/signal/64: Fix SS if needed when delivering a 64-bit signal Andy Lutomirski
2015-10-13 1:04 ` [RFC 3/4] x86/signal/64: Re-add support for SS in the 64-bit signal context Andy Lutomirski
2015-10-13 14:59 ` Stas Sergeev
2015-10-14 15:01 ` Ingo Molnar [this message]
2015-10-14 15:09 ` Stas Sergeev
2015-10-14 16:40 ` Andy Lutomirski
2015-10-14 17:40 ` Stas Sergeev
2015-10-14 18:06 ` Andy Lutomirski
2015-10-14 18:34 ` Stas Sergeev
2015-10-14 18:52 ` Andy Lutomirski
2015-10-14 21:37 ` Stas Sergeev
2015-10-14 21:41 ` Andy Lutomirski
2015-10-18 13:36 ` Stas Sergeev
2015-10-18 16:12 ` Andy Lutomirski
2015-10-18 16:29 ` Stas Sergeev
2015-10-18 16:36 ` Andy Lutomirski
2015-10-18 16:43 ` Stas Sergeev
2015-10-18 17:06 ` Andy Lutomirski
2015-10-14 16:40 ` Cyrill Gorcunov
2015-10-14 16:42 ` Andy Lutomirski
2015-10-14 16:57 ` Cyrill Gorcunov
2015-10-14 16:57 ` Stas Sergeev
2015-10-14 17:01 ` Cyrill Gorcunov
2015-10-13 1:04 ` [RFC 4/4] selftests/x86: Add tests for UC_SIGCONTEXT_SS and UC_STRICT_RESTORE_SS Andy Lutomirski
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