linux-kernel - Re: KASAN: use-after-free Read in rds_tcp

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Message-ID: <CACT4Y+Y4iK+xRUUssSSomqv59GDnVWt+O86tHHmUFESFQisrrw@mail.gmail.com>
Date:   Wed, 14 Feb 2018 18:16:43 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Joe Perches <joe@...ches.com>
Cc:     Sowmini Varadhan <sowmini.varadhan@...cle.com>,
        syzbot <syzbot+bbd8e9a06452cc48059b@...kaller.appspotmail.com>,
        David Miller <davem@...emloft.net>,
        LKML <linux-kernel@...r.kernel.org>, linux-rdma@...r.kernel.org,
        netdev <netdev@...r.kernel.org>, rds-devel@....oracle.com,
        Santosh Shilimkar <santosh.shilimkar@...cle.com>,
        syzkaller-bugs@...glegroups.com
Subject: Re: KASAN: use-after-free Read in rds_tcp_tune

On Wed, Feb 14, 2018 at 6:02 PM, Joe Perches <joe@...ches.com> wrote:
> On Wed, 2018-02-14 at 16:55 +0100, Dmitry Vyukov wrote:
>> On Wed, Feb 14, 2018 at 4:35 PM, Sowmini Varadhan <sowmini.varadhan@...cle.com> wrote:
>> > btw, checkpatch.pl complains about the syzbot*@...kaller.appspotmail.com
>> > addresses as "Unrecognized email address", we should fix that
>> > error from checkpatch at some point.
>>
>> Interesting. Looking at checkpatch.pl I think it wants all addresses
>> to be in <>, i.e.
>> Reported-by: <syzbot+bbd8e9a06452cc48059b@...kaller.appspotmail.com>
>> There probably was some reason to enforce this, so I think I will
>> change the syzbot email template to include <>.
>> Thanks!
>
> Not really.
>
> It's the somewhat unusual + in the address
> that perl needs quoted before a substitution.
>
> I believe this fixes it in checkpatch.
> ---
>  scripts/checkpatch.pl | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> index 3d4040322ae1..2b8397da39d3 100755
> --- a/scripts/checkpatch.pl
> +++ b/scripts/checkpatch.pl
> @@ -1075,7 +1075,7 @@ sub parse_email {
>         } elsif ($formatted_email =~ /(\S+\@\S+)(.*)$/) {
>                 $address = $1;
>                 $comment = $2 if defined $2;
> -               $formatted_email =~ s/$address.*$//;
> +               $formatted_email =~ s/\Q$address\E.*$//;
>                 $name = $formatted_email;
>                 $name = trim($name);
>                 $name =~ s/^\"|\"$//g;


I can confirm that running
$ git show HEAD | scripts/checkpatch.pl -
on a commit that contains a syzbot Reported-by tag does not produce
the warning anymore.

Joe, do you mind mailing this as patch?