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Message-ID: <20170510071511.GA17441@infradead.org>
Date: Wed, 10 May 2017 00:15:11 -0700
From: Christoph Hellwig <hch@...radead.org>
To: Kees Cook <keescook@...omium.org>
Cc: Andy Lutomirski <luto@...capital.net>,
	Christoph Hellwig <hch@...radead.org>,
	Andy Lutomirski <luto@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Kernel Hardening <kernel-hardening@...ts.openwall.com>,
	Greg KH <greg@...ah.com>,
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	LKML <linux-kernel@...r.kernel.org>,
	David Howells <dhowells@...hat.com>,
	Dave Hansen <dave.hansen@...el.com>,
	"H . Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>,
	Pavel Tikhomirov <ptikhomirov@...tuozzo.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-s390 <linux-s390@...r.kernel.org>,
	the arch/x86 maintainers <x86@...nel.org>,
	Russell King <linux@...linux.org.uk>,
	Will Deacon <will.deacon@....com>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	René Nyffenegger <mail@...enyffenegger.ch>,
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	Rik van Riel <riel@...hat.com>, Arnd Bergmann <arnd@...db.de>,
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	Thomas Gleixner <tglx@...utronix.de>,
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	Linux API <linux-api@...r.kernel.org>,
	Oleg Nesterov <oleg@...hat.com>, James Morse <james.morse@....com>,
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	"Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: Re: Re: [PATCH v9 1/4] syscalls: Verify address
 limit before returning to user-mode

On Tue, May 09, 2017 at 04:31:00PM -0700, Kees Cook wrote:
> > I don't like silent fixups.  If we want to do this, we should BUG or
> > at least WARN, not just change the addr limit.  But I'm also not
> > convinced it's indicative of an actual bug here.
> 
> Nothing should enter that function with KERNEL_DS set, right?

It might very well do.  Various drivers or the networking code mess
with the address limits for fairly broad sections of code.

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