linux-kernel - Re: [PATCH 4/4] leaking_addresses: add scan

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Date:   Mon, 26 Feb 2018 13:01:32 +1100
From:   "Tobin C. Harding" <me@...in.cc>
To:     Tycho Andersen <tycho@...ho.ws>
Cc:     Kernel Hardening <kernel-hardening@...ts.openwall.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/4] leaking_addresses: add scan_once array

On Sun, Feb 25, 2018 at 06:09:53PM -0700, Tycho Andersen wrote:
> Hi Tobin,
> 
> On Mon, Feb 19, 2018 at 01:50:49PM +1100, Tobin C. Harding wrote:
> > +sub already_scanned
> > +{
> > +	my ($filename) = @_;
> > +	state %seen;
> > +
> > +	foreach (@once_only) {
> > +		if (/^$filename$/) {
> > +			if ($seen{$_} == 1) {
> 
> This should be something like,
> 
> if (($seen{$_} //= 0) == 1) {
> 
> otherwise I get a bunch of uninitialized warnings,
> 
> Use of uninitialized value in pattern match (m//) at /usr/share/perl/5.26/Math/BigInt.pm line 1199.
>     Math::BigInt::bcmp(Math::BigInt=HASH(0x55dc2f7e4580), undef) called at /usr/share/perl/5.26/Math/BigInt.pm line 1257
>     Math::BigInt::beq(Math::BigInt=HASH(0x55dc2f7e4580), undef) called at /usr/share/perl/5.26/Math/BigInt.pm line 105
>     Math::BigInt::__ANON__(Math::BigInt=HASH(0x55dc2f7e4580), undef, 1) called at ./leaking_addresses.pl line 422
>     main::already_scanned("smaps") called at ./leaking_addresses.pl line 448
>     main::skip("/proc/1/smaps") called at ./leaking_addresses.pl line 509
>     main::walk("/proc", "/sys") called at ./leaking_addresses.pl line 159
> 
> Tycho

Cool, thanks.  Will fix and re-spin.


	Tobin