linux-kernel - Re: [RESEND][RFC PATCH 0/6] Fork brute force attack mitigation (fbfam)

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Message-ID: <CAFqZXNtwDpX+O69Jj3AmxMoiW7o6SE07SqDDFnGMObu8hLDQDg@mail.gmail.com>
Date:   Sat, 12 Sep 2020 22:48:39 +0200
From:   Ondrej Mosnacek <omosnace@...hat.com>
To:     Mel Gorman <mgorman@...e.de>
Cc:     John Wood <john.wood@....com>, James Morris <jmorris@...ei.org>,
        Kees Cook <keescook@...omium.org>,
        Kernel Hardening <kernel-hardening@...ts.openwall.com>,
        Matthew Wilcox <willy@...radead.org>,
        Jonathan Corbet <corbet@....net>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Iurii Zaikin <yzaikin@...gle.com>,
        "Serge E. Hallyn" <serge@...lyn.com>, linux-doc@...r.kernel.org,
        Linux kernel mailing list <linux-kernel@...r.kernel.org>,
        linux-fsdevel@...r.kernel.org,
        Linux Security Module list 
        <linux-security-module@...r.kernel.org>
Subject: Re: [RESEND][RFC PATCH 0/6] Fork brute force attack mitigation (fbfam)

On Sat, Sep 12, 2020 at 4:51 PM Mel Gorman <mgorman@...e.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.wood@....com>
> > > > >  also visible at https://github.com/johwood/linux fbfam]
> > > > >
> > > > > From: John Wood <john.wood@....com>
> > > >
> > > > Why are you resending this? The author of the code needs to be able to
> > > > send and receive emails directly as part of development and maintenance.
> >
> > I tried to send the full patch serie by myself but my email got blocked. 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 amount
> > of mails in a short period. They also informed me that soon I will be able
> > to send more mails. The quantity increase with the age of the account.
> >
>
> If you're using "git send-email" then specify --confirm=always and
> either manually send a mail every few seconds or use an expect script
> like
>
> #!/bin/bash
> EXPECT_SCRIPT=
> function cleanup() {
>         if [ "$EXPECT_SCRIPT" != "" ]; then
>                 rm $EXPECT_SCRIPT
>         fi
> }
> trap cleanup EXIT
>
> EXPECT_SCRIPT=`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.

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

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