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Re: [kernel-hardening] Re: [PATCH v9 1/4] syscalls: Verify address limit before returning to user-mode

From Al Viro <viro@ZenIV.linux.org.uk>
Newsgroups linux.kernel
Subject Re: [kernel-hardening] Re: [PATCH v9 1/4] syscalls: Verify address limit before returning to user-mode
Date 2017-05-10 04:20 +0200
Message-ID <tFpom-21R-5@gated-at.bofh.it> (permalink)
References (4 earlier) <tF786-6qs-15@gated-at.bofh.it> <tF99U-7Or-11@gated-at.bofh.it> <tFd3P-28B-7@gated-at.bofh.it> <tFd3Q-28B-19@gated-at.bofh.it> <tFfS2-41K-33@gated-at.bofh.it>
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On Tue, May 09, 2017 at 09:03:22AM -0700, Christoph Hellwig wrote:
> On Tue, May 09, 2017 at 06:02:50AM -0700, Christoph Hellwig wrote:
> > On Tue, May 09, 2017 at 06:00:01AM -0700, Andy Lutomirski wrote:
> > > fs/splice.c has some, ahem, interesting uses that have been the source
> > > of nasty exploits in the past.  Converting them to use iov_iter
> > > properly would be really, really nice.  Christoph, I don't suppose
> > > you'd like to do that?
> > 
> > I can take care of all the fs code including this one.

Oh?

> I spent the afternoon hacking up where I'd like this to head.  It's
> completely untested as of now:
> 
> 	http://git.infradead.org/users/hch/vfs.git/shortlog/refs/heads/setfs-elimination

And just what happens to driver that has no ->read_iter()?  Unless I'm
seriously misreading that, NAK with extreme prejudice.

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[PATCH v9 1/4] syscalls: Verify address limit before returning to user-mode Thomas Garnier <thgarnie@google.com> - 2017-04-28 17:40 +0200
  Re: [PATCH v9 1/4] syscalls: Verify address limit before returning to user-mode Thomas Garnier <thgarnie@google.com> - 2017-05-06 00:20 +0200
    Re: [PATCH v9 1/4] syscalls: Verify address limit before returning  to user-mode Ingo Molnar <mingo@kernel.org> - 2017-05-08 09:40 +0200
      Re: [PATCH v9 1/4] syscalls: Verify address limit before returning  to user-mode Ingo Molnar <mingo@kernel.org> - 2017-05-08 10:00 +0200
        Re: [kernel-hardening] Re: [PATCH v9 1/4] syscalls: Verify address  limit before returning to user-mode Daniel Micay <danielmicay@gmail.com> - 2017-05-08 17:30 +0200
          Re: [kernel-hardening] Re: [PATCH v9 1/4] syscalls: Verify address  limit before returning to user-mode Kees Cook <keescook@chromium.org> - 2017-05-08 17:30 +0200
            Re: [kernel-hardening] Re: [PATCH v9 1/4] syscalls: Verify address  limit before returning to user-mode Thomas Garnier <thgarnie@google.com> - 2017-05-08 22:00 +0200
            Re: [kernel-hardening] Re: [PATCH v9 1/4] syscalls: Verify address  limit before returning to user-mode Ingo Molnar <mingo@kernel.org> - 2017-05-09 09:00 +0200
              Re: [kernel-hardening] Re: [PATCH v9 1/4] syscalls: Verify address  limit before returning to user-mode Greg KH <greg@kroah.com> - 2017-05-09 13:20 +0200
                Re: [kernel-hardening] Re: [PATCH v9 1/4] syscalls: Verify address  limit before returning to user-mode Thomas Garnier <thgarnie@google.com> - 2017-05-09 16:40 +0200
              Re: [kernel-hardening] Re: [PATCH v9 1/4] syscalls: Verify address  limit before returning to user-mode Kees Cook <keescook@chromium.org> - 2017-05-09 18:40 +0200
      Re: [kernel-hardening] Re: [PATCH v9 1/4] syscalls: Verify address  limit before returning to user-mode Greg KH <greg@kroah.com> - 2017-05-08 14:50 +0200
        Re: [kernel-hardening] Re: [PATCH v9 1/4] syscalls: Verify address  limit before returning to user-mode Ingo Molnar <mingo@kernel.org> - 2017-05-09 08:50 +0200
          Re: [kernel-hardening] Re: [PATCH v9 1/4] syscalls: Verify address  limit before returning to user-mode Christoph Hellwig <hch@infradead.org> - 2017-05-09 11:00 +0200
            Re: [kernel-hardening] Re: [PATCH v9 1/4] syscalls: Verify address  limit before returning to user-mode Andy Lutomirski <luto@kernel.org> - 2017-05-09 15:10 +0200
              Re: [kernel-hardening] Re: [PATCH v9 1/4] syscalls: Verify address  limit before returning to user-mode Christoph Hellwig <hch@infradead.org> - 2017-05-09 15:10 +0200
                Re: [kernel-hardening] Re: [PATCH v9 1/4] syscalls: Verify address  limit before returning to user-mode Christoph Hellwig <hch@infradead.org> - 2017-05-09 18:10 +0200
                Re: [kernel-hardening] Re: [PATCH v9 1/4] syscalls: Verify address  limit before returning to user-mode Kees Cook <keescook@chromium.org> - 2017-05-09 19:00 +0200
                Re: [kernel-hardening] Re: [PATCH v9 1/4] syscalls: Verify address  limit before returning to user-mode Andy Lutomirski <luto@amacapital.net> - 2017-05-10 01:00 +0200
                Re: [kernel-hardening] Re: [PATCH v9 1/4] syscalls: Verify address  limit before returning to user-mode Kees Cook <keescook@chromium.org> - 2017-05-10 01:40 +0200
                Re: [kernel-hardening] Re: [PATCH v9 1/4] syscalls: Verify address  limit before returning to user-mode Andy Lutomirski <luto@kernel.org> - 2017-05-10 04:10 +0200
                Re: [kernel-hardening] Re: [PATCH v9 1/4] syscalls: Verify address  limit before returning to user-mode Christoph Hellwig <hch@infradead.org> - 2017-05-10 09:20 +0200
                Re: [kernel-hardening] Re: [PATCH v9 1/4] syscalls: Verify address  limit before returning to user-mode Borislav Petkov <bp@alien8.de> - 2017-05-11 13:30 +0200
                Re: [kernel-hardening] Re: [PATCH v9 1/4] syscalls: Verify address  limit before returning to user-mode Christoph Hellwig <hch@infradead.org> - 2017-05-10 08:50 +0200
                Re: [kernel-hardening] Re: [PATCH v9 1/4] syscalls: Verify address  limit before returning to user-mode Al Viro <viro@ZenIV.linux.org.uk> - 2017-05-10 04:20 +0200
                Re: [kernel-hardening] Re: [PATCH v9 1/4] syscalls: Verify address  limit before returning to user-mode Al Viro <viro@ZenIV.linux.org.uk> - 2017-05-10 04:50 +0200
                Re: [kernel-hardening] Re: [PATCH v9 1/4] syscalls: Verify address  limit before returning to user-mode Al Viro <viro@ZenIV.linux.org.uk> - 2017-05-10 05:20 +0200
                Re: [kernel-hardening] Re: [PATCH v9 1/4] syscalls: Verify address  limit before returning to user-mode Al Viro <viro@ZenIV.linux.org.uk> - 2017-05-10 05:30 +0200
                Re: [kernel-hardening] Re: [PATCH v9 1/4] syscalls: Verify address  limit before returning to user-mode Al Viro <viro@ZenIV.linux.org.uk> - 2017-05-10 05:50 +0200
                Re: [kernel-hardening] Re: [PATCH v9 1/4] syscalls: Verify address  limit before returning to user-mode Christoph Hellwig <hch@infradead.org> - 2017-05-10 09:00 +0200
                Re: [kernel-hardening] Re: [PATCH v9 1/4] syscalls: Verify address  limit before returning to user-mode Christoph Hellwig <hch@infradead.org> - 2017-05-10 09:00 +0200
                Re: [kernel-hardening] Re: [PATCH v9 1/4] syscalls: Verify address  limit before returning to user-mode Al Viro <viro@ZenIV.linux.org.uk> - 2017-05-10 09:30 +0200
                Re: [kernel-hardening] Re: [PATCH v9 1/4] syscalls: Verify address  limit before returning to user-mode Christoph Hellwig <hch@infradead.org> - 2017-05-10 09:40 +0200
                Re: [kernel-hardening] Re: [PATCH v9 1/4] syscalls: Verify address  limit before returning to user-mode Christoph Hellwig <hch@infradead.org> - 2017-05-10 09:00 +0200
                Re: [kernel-hardening] Re: [PATCH v9 1/4] syscalls: Verify address  limit before returning to user-mode Arnd Bergmann <arnd@arndb.de> - 2017-05-10 09:30 +0200
                Re: [kernel-hardening] Re: [PATCH v9 1/4] syscalls: Verify address  limit before returning to user-mode Christoph Hellwig <hch@infradead.org> - 2017-05-10 09:40 +0200
              Re: [kernel-hardening] Re: [PATCH v9 1/4] syscalls: Verify address  limit before returning to user-mode Brian Gerst <brgerst@gmail.com> - 2017-05-09 18:10 +0200
              Re: [kernel-hardening] Re: [PATCH v9 1/4] syscalls: Verify address  limit before returning to user-mode Arnd Bergmann <arnd@arndb.de> - 2017-05-10 09:40 +0200
                Re: [kernel-hardening] Re: [PATCH v9 1/4] syscalls: Verify address  limit before returning to user-mode Al Viro <viro@ZenIV.linux.org.uk> - 2017-05-10 10:10 +0200
                Re: [kernel-hardening] Re: [PATCH v9 1/4] syscalls: Verify address  limit before returning to user-mode Christoph Hellwig <hch@infradead.org> - 2017-05-10 10:20 +0200
                Re: [kernel-hardening] Re: [PATCH v9 1/4] syscalls: Verify address  limit before returning to user-mode Andy Lutomirski <luto@kernel.org> - 2017-05-11 02:20 +0200
      Re: [PATCH v9 1/4] syscalls: Verify address limit before returning to user-mode Kees Cook <keescook@chromium.org> - 2017-05-08 15:20 +0200
        Re: [PATCH v9 1/4] syscalls: Verify address limit before returning to user-mode Jann Horn <jannh@google.com> - 2017-05-08 16:10 +0200
          Re: [PATCH v9 1/4] syscalls: Verify address limit before returning  to user-mode Al Viro <viro@ZenIV.linux.org.uk> - 2017-05-08 22:50 +0200
        Re: [PATCH v9 1/4] syscalls: Verify address limit before returning  to user-mode Ingo Molnar <mingo@kernel.org> - 2017-05-08 16:10 +0200
          Re: [PATCH v9 1/4] syscalls: Verify address limit before returning to user-mode Kees Cook <keescook@chromium.org> - 2017-05-08 17:30 +0200
            Re: [PATCH v9 1/4] syscalls: Verify address limit before returning  to user-mode Ingo Molnar <mingo@kernel.org> - 2017-05-09 08:40 +0200

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