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Date:   Sun, 13 Sep 2020 09:24:30 +0200
From:   John Wood <john.wood@gmx.com>
To:     Ondrej Mosnacek <omosnace@redhat.com>, Mel Gorman <mgorman@suse.de>
Cc:     John Wood <john.wood@gmx.com>, James Morris <jmorris@namei.org>,
        Kees Cook <keescook@chromium.org>,
        Kernel Hardening <kernel-hardening@lists.openwall.com>,
        Matthew Wilcox <willy@infradead.org>,
        Jonathan Corbet <corbet@lwn.net>,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        Ingo Molnar <mingo@redhat.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Juri Lelli <juri.lelli@redhat.com>,
        Vincent Guittot <vincent.guittot@linaro.org>,
        Dietmar Eggemann <dietmar.eggemann@arm.com>,
        Steven Rostedt <rostedt@goodmis.org>,
        Ben Segall <bsegall@google.com>,
        Luis Chamberlain <mcgrof@kernel.org>,
        Iurii Zaikin <yzaikin@google.com>,
        "Serge E. Hallyn" <serge@hallyn.com>, linux-doc@vger.kernel.org,
        Linux kernel mailing list <linux-kernel@vger.kernel.org>,
        linux-fsdevel@vger.kernel.org,
        Linux Security Module list 
        <linux-security-module@vger.kernel.org>
Subject: Re: [RESEND][RFC PATCH 0/6] Fork brute force attack mitigation
 (fbfam)
Message-ID: <20200913072430.GA2965@ubuntu>
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 <20200912093652.GA3041@ubuntu>
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Hi,

On Sat, Sep 12, 2020 at 10:48:39PM +0200, Ondrej Mosnacek wrote:
> On Sat, Sep 12, 2020 at 4:51 PM Mel Gorman <mgorman@suse.de> wrote:
> > On Sat, Sep 12, 2020 at 11:36:52AM +0200, John Wood wrote:
> > > On Sat, Sep 12, 2020 at 12:56:18AM -0700, Kees Cook wrote:
> > > > On Sat, Sep 12, 2020 at 10:03:23AM +1000, James Morris wrote:
> > > > > On Thu, 10 Sep 2020, Kees Cook wrote:
> > > > >
> > > > > > [kees: re-sending this series on behalf of John Wood <john.woo=
d@gmx.com>
> > > > > >  also visible at https://github.com/johwood/linux fbfam]
> > > > > >
> > > > > > From: John Wood <john.wood@gmx.com>
> > > > >
> > > > > Why are you resending this? The author of the code needs to be a=
ble to
> > > > > send and receive emails directly as part of development and main=
tenance.
> > >
> > > I tried to send the full patch serie by myself but my email got bloc=
ked. After
> > > get support from my email provider it told to me that my account is =
young,
> > > and due to its spam policie I am not allow, for now, to send a big a=
mount
> > > of mails in a short period. They also informed me that soon I will b=
e able
> > > to send more mails. The quantity increase with the age of the accoun=
t.
> > >
> >
> > If you're using "git send-email" then specify --confirm=3Dalways and
> > either manually send a mail every few seconds or use an expect script
> > like
> >
> > #!/bin/bash
> > EXPECT_SCRIPT=3D
> > function cleanup() {
> >         if [ "$EXPECT_SCRIPT" !=3D "" ]; then
> >                 rm $EXPECT_SCRIPT
> >         fi
> > }
> > trap cleanup EXIT
> >
> > EXPECT_SCRIPT=3D`mktemp`
> > cat > $EXPECT_SCRIPT <<EOF
> > spawn sh ./SEND
> > expect {
> >         "Send this email"   { sleep 10; exp_send y\\r; exp_continue }
> > }
> > EOF
> >
> > expect -f $EXPECT_SCRIPT
> > exit $?
> >
> > This will work if your provider limits the rate mails are sent rather
> > than the total amount.

Yes, it seems to be what is happening.

> ...or you could keep it simple and just pass "--batch-size 1
> --relogin-delay 10" to git send-email ;)

Mel and Ondrej thanks a lot for the proposed solutions. I'm sure some of
your solutions will be used soon.

> --
> Ondrej Mosnacek
> Software Engineer, Platform Security - SELinux kernel
> Red Hat, Inc.

Regards,
John Wood