linux-kernel - Re: [PATCH v3 1/3] x86/ptrace: Stop setting TS

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Date:	Mon, 25 Jul 2016 08:38:25 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Andy Lutomirski <luto@...capital.net>,
	Oleg Nesterov <oleg@...hat.com>
Cc:	Andy Lutomirski <luto@...nel.org>, X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Borislav Petkov <bp@...en8.de>,
	Pedro Alves <palves@...hat.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH v3 1/3] x86/ptrace: Stop setting TS_COMPAT in ptrace code


* Andy Lutomirski <luto@...capital.net> wrote:

> On Mon, Jun 20, 2016 at 4:39 PM, Andy Lutomirski <luto@...nel.org> wrote:
> > Setting TS_COMPAT in ptrace is wrong: if we happen to do it during
> > syscall entry, then we'll confuse seccomp and audit.  (The former
> > isn't a security problem: seccomp is currently entirely insecure if a
> > malicious ptracer is attached.)  As a minimal fix, this patch adds a
> > new flag TS_I386_REGS_POKED that handles the ptrace special case.
> 
> Hi Ingo-
> 
> Could you apply this one patch for 4.8?  While I don't think it's a
> significant security issue in 4.7 or earlier, leaving it unfixed in
> 4.8 will introduce a potentially unpleasant interaction with some
> seccomp changes that are queued up in the
> security tree for 4.8.
> 
> It will have a trivially-resolvable conflict with -mm.
> 
> The rest of the series this is in can wait.

I don't mind the rest of the series either - could you please repost it (with the 
review feedback addressed)?

Looks like that with minor changes the series has Oleg's Acked-by?

Thanks,

	Ingo