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Message-ID: <20171108104221.GH2652@pathway.suse.cz>
Date: Wed, 8 Nov 2017 11:42:21 +0100
From: Petr Mladek <pmladek@...e.com>
To: "Tobin C. Harding" <me@...in.cc>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>,
"Jason A. Donenfeld" <Jason@...c4.com>,
Theodore Ts'o <tytso@....edu>, Kees Cook <keescook@...omium.org>,
Paolo Bonzini <pbonzini@...hat.com>,
Tycho Andersen <tycho@...ker.com>,
"Roberts, William C" <william.c.roberts@...el.com>,
Tejun Heo <tj@...nel.org>,
Jordan Glover <Golden_Miller83@...tonmail.ch>,
Greg KH <gregkh@...uxfoundation.org>, Joe Perches <joe@...ches.com>,
Ian Campbell <ijc@...lion.org.uk>,
Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <wilal.deacon@....com>,
Steven Rostedt <rostedt@...dmis.org>,
Chris Fries <cfries@...gle.com>, Dave Weinstein <olorin@...gle.com>,
Daniel Micay <danielmicay@...il.com>,
Djalal Harouni <tixxdz@...il.com>, linux-kernel@...r.kernel.org,
Network Development <netdev@...r.kernel.org>,
David Miller <davem@...emloft.net>,
kernel-hardening@...ts.openwall.com,
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
Andy Lutomirski <luto@...nel.org>,
Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH 4/7] scripts/leaking_addresses: add reporting
On Wed 2017-11-08 14:37:36, Tobin C. Harding wrote:
> Currently script just dumps all results found. Potentially, this risks
> loosing single results among multiple duplicate results. We need some
> way of restricting duplicates to assist users of the script. It would
> also be nice if we got a report instead of raw results.
>
> Duplicates can be defined in various ways, instead of trying to find a
> single perfect solution we can present the user with various options to
> display the output. Doing so will typically lead to users wanting to
> view the output multiple times. Currently we scan the kernel each time,
> this is slow and unnecessary. We can expedite the process by writing the
> results to file for subsequent viewing.
>
> Add sub-commands `scan` and `format`. Display output as a report instead
> of raw results. Add --raw flag to view raw results. Save results to
> file. For subsequent calls to `format` parse output file instead of
> re-scanning.
>
> Signed-off-by: Tobin C. Harding <me@...in.cc>
> ---
> scripts/leaking_addresses.pl | 201 ++++++++++++++++++++++++++++++++++++++++---
> 1 file changed, 187 insertions(+), 14 deletions(-)
>
> diff --git a/scripts/leaking_addresses.pl b/scripts/leaking_addresses.pl
> index 719ed0aaede7..4c31e935319b 100755
> --- a/scripts/leaking_addresses.pl
> +++ b/scripts/leaking_addresses.pl
> @@ -21,14 +21,19 @@ use File::Spec;
> use Cwd 'abs_path';
> use Term::ANSIColor qw(:constants);
> use Getopt::Long qw(:config no_auto_abbrev);
> +use File::Spec::Functions 'catfile';
>
> my $P = $0;
> my $V = '0.01';
>
> -# Directories to scan.
> +# Directories to scan (we scan `dmesg` also).
> my @DIRS = ('/proc', '/sys');
>
> # Command line options.
> +my $output = "scan.out";
The hard-coded filename and its use is dangerous. Nobody expects that
this kind of script writes/re-writes a file on the system.
> +my $suppress_dmesg = 0;
> +my $squash_by_path = 0;
> +my $raw = 0;
> my $help = 0;
> my $debug = 0;
>
> @@ -70,21 +75,34 @@ sub help
> my ($exitcode) = @_;
>
> print << "EOM";
> -Usage: $P [OPTIONS]
> +
> +Usage: $P COMMAND [OPTIONS]
> Version: $V
>
> +Commands:
> +
> + scan Scan the kernel (savesg raw results to file and runs `format`).
> + format Parse results file and format output.
The later formatting/filtering might be useful but the use
of the hard coded file is strange. Also it is pity that
the script does not do anything useful out of box.
I suggest to remove the commands and do the scan out of box.
It should not store anything on the disk by default.
Then we could define following options:
-o, --output=<file> Store raw results into file for later formatting.
-i, --input=<file> Read raw result from file and just format them.
Well, it is still somehow non-intuitive. It might help to
be more explicit:
-o, --output-raw=<file>
-i, --input-raw=<file>
> Options:
>
> - -d, --debug Display debugging output.
> - -h, --help, --version Display this help and exit.
> + -o, --output=<file> Raw results output file, used for later formatting.
> + --suppress-dmesg Do not show dmesg results.
> + --squash-by-path Show one result per unique path.
I would personally add also option for the default mode:
--squash-by-filename Show one result per unique filename
(default).
In fact, I would personally use --squash-by-path or even --raw by
default. These provide easy to understand output. While the
--squash-by-filename mode has pretty good results but
it is quite non-intuitive.
Best Regards,
Petr
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