linux-kernel - Re: [GIT PULL] asm-generic: kill <asm/segment.h> and improve nommu generic uaccess helpers

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Date:   Fri, 17 May 2019 00:48:44 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     James Bottomley <James.Bottomley@...senpartnership.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Christoph Hellwig <hch@....de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        linux-riscv@...ts.infradead.org
Subject: Re: [GIT PULL] asm-generic: kill <asm/segment.h> and improve nommu
 generic uaccess helpers

On Thu, May 16, 2019 at 11:53 PM James Bottomley
<James.Bottomley@...senpartnership.com> wrote:
>
> On Thu, 2019-05-16 at 13:59 -0700, Linus Torvalds wrote:
> > On Thu, May 16, 2019 at 1:34 PM Arnd Bergmann <arnd@...db.de> wrote:
> > >
> > >
> > > I have reconfigured it locally now and pushed an identical tag with
> > > a
> > > new signature. Can you see if that gives you the same warning if
> > > you
> > > try to pull that?
> >
> > No, same issue:
>
> The problem seems to be this:
>
> jejb@...vis:~> gpg --list-keys 60AB47FFC9095227
> pub   rsa4096 2011-10-27 [C]
>       88AFCD206B1611957187F16B60AB47FFC9095227
> sub   rsa4096 2011-10-27 [E]
>
> Your key is a "Certification key" and you have an encryption subkey but
> no signing key at all.  Usually you either have a signing subkey or
> your master key is both certification and signing ([CS] flags).
> Certification keys can only be used to certify other keys, they can't
> be used for signing, but I bet gpg is assuming that it can sign with
> the master key even if it doesn't possess the signing flag.

Strangely, the copy I have on my local machine does have the 'S'
flag. I sent it back to the server now.

> You can make your master key a signing key by doing
>
> gpg --expert --edit-key 60AB47FFC9095227
>
> Then doing
>
> gpg> change-usage
>
> and selecting "toggle sign"
>
> Or you could just add a signing subkey.

I had some problems with creating a subkey, probably because of
some misconfiguration. It seems to work now, so I created a new
signing subkey now for future use.

Thanks a lot!

     Arnd