Re: KASAN: use-after-free Read in rds_tcp_tune

Joe Perches
2018-02-14T17:33:00Z

On Wed, 2018-02-14 at 18:16 +0100, Dmitry Vyukov wrote:
> On Wed, Feb 14, 2018 at 6:02 PM, Joe Perches <joe@perches.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@oracle.com> wrote:
> > > > btw, checkpatch.pl complains about the syzbot*@syzkaller.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@syzkaller.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
[]
> > @@ -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?

'course not. It's nice you tested it.

I did on the last thousand commits without
apparent change.

$ git log --format=oneline --no-merges -1000 | \
cut -f1 -d" " | \
while read commit ; do \
./scripts/checkpatch.pl --git $commit --types=bad_sign_off --terse ; \
done