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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>,
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the arch/x86 maintainers <x86@...nel.org>,
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René Nyffenegger <mail@...enyffenegger.ch>,
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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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