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Date: Mon, 4 Dec 2017 18:58:49 +0530
From: Kaiwan N Billimoria <kaiwan.billimoria@...il.com>
To: Alexander Kapshuk <alexander.kapshuk@...il.com>
Cc: "Tobin C. Harding" <me@...in.cc>, linux-kernel <linux-kernel@...r.kernel.org>,
kernel-hardening@...ts.openwall.com
Subject: Re: [PATCH] leaking_addresses: add support for 32-bit kernel addresses
Sure, thanks Alexander..
Tobin, request you to pl make the change while merging, thanks..
Thanks & Regards,
Kaiwan.
On Mon, Dec 4, 2017 at 6:07 PM, Alexander Kapshuk <
alexander.kapshuk@...il.com> wrote:
> On Mon, Dec 4, 2017 at 12:20 PM, <kaiwan.billimoria@...il.com> wrote:
> > On Mon, 2017-12-04 at 19:21 +1100, Tobin C. Harding wrote:
> >> On Mon, Dec 04, 2017 at 10:51:53AM +0530, Kaiwan N Billimoria wrote:
> >> > > ---
> >> > diff --git a/scripts/leaking_addresses.pl b/scripts/
> leaking_addresses.pl
> >> > index 9906dcf8b807..260b52e456f1 100755
> >> > --- a/scripts/leaking_addresses.pl
> >> > +++ b/scripts/leaking_addresses.pl
> >> > @@ -266,7 +266,7 @@ sub is_false_positive
> >> > sub is_false_positive_ix86_32
> >> > {
> >> > my ($match) = @_;
> >> > - state $page_offset = eval get_page_offset(); # only gets
> called once
> >> > + state $page_offset = hex get_page_offset(); # only gets
> called once
> >>
> >> I don't think this is valid ;) I meant use hex() to convert the string
> >> to an int so it doesn't throw the warning (inside get_page_offset()).
> >
> > Yup, got it, thanks :-p
> > Combined patch below:
> >
> >
> > ---
> > scripts/leaking_addresses.pl | 13 ++++++-------
> > 1 file changed, 6 insertions(+), 7 deletions(-)
> >
> > diff --git a/scripts/leaking_addresses.pl b/scripts/leaking_addresses.pl
> > index 9906dcf8b807..a595a2c66b12 100755
> > --- a/scripts/leaking_addresses.pl
> > +++ b/scripts/leaking_addresses.pl
> > @@ -266,8 +266,7 @@ sub is_false_positive
> > sub is_false_positive_ix86_32
> > {
> > my ($match) = @_;
> > - state $page_offset = eval get_page_offset(); # only gets called
> once
> > -
> > + state $page_offset = get_page_offset(); # only gets called once
> > if ($match =~ '\b(0x)?(f|F){8}\b') {
> > return 1;
> > }
> > @@ -283,7 +282,7 @@ sub is_false_positive_ix86_32
> > sub get_page_offset
> > {
> > my $page_offset;
> > - my $default_offset = "0xc0000000";
> > + my $default_offset = hex("0xc0000000");
> > my @config_files;
> >
> > # Allow --page-offset-32bit to override.
> > @@ -306,23 +305,23 @@ sub get_page_offset
> > } else {
> > $page_offset = parse_kernel_config_file($tmp_
> file);
> > if ($page_offset ne "") {
> > - return $page_offset;
> > + return hex($page_offset);
> > }
> > }
> > system("rm -f $tmp_file");
> > }
> >
> > foreach my $config_file (@config_files) {
> > - $config_file =~ s/\R*//g;
> > + chomp $config_file;
> > $page_offset = parse_kernel_config_file($config_file);
> > if ($page_offset ne "") {
> > - return $page_offset;
> > + return hex($page_offset);
> > }
> > }
> >
> > printf STDERR "\nFailed to parse kernel config files\n";
> > printf STDERR "*** NOTE ***\n";
> > - printf STDERR "Falling back to PAGE_OFFSET = %s\n\n",
> $default_offset;
> > + printf STDERR "Falling back to PAGE_OFFSET = 0x%x\n\n",
> $default_offset;
>
> Better use the '#' flag with the 'x' conversion specifier:
> perl -e 'my $default_offset = hex("0xc0000000");printf "%#x\n",
> $default_offset'
> 0xc0000000
>
> >
> > return $default_offset;
> > }
> > --
> > 2.14.3
> >
> > Thanks,
> > Kaiwan.
> >
> >> thanks,
> >> Tobin.
>
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