linux-kernel - Re: [PATCH 3/5] gcc-plugins/stackleak: Add 'verbose' plugin parameter

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Message-ID: <202006101303.71B51BF1@keescook>
Date:   Wed, 10 Jun 2020 13:04:29 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Alexander Popov <alex.popov@...ux.com>
Cc:     Emese Revfy <re.emese@...il.com>,
        Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Thiago Jung Bauermann <bauerman@...ux.ibm.com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Jessica Yu <jeyu@...nel.org>,
        Sven Schnelle <svens@...ckframe.org>,
        Iurii Zaikin <yzaikin@...gle.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Collingbourne <pcc@...gle.com>,
        Naohiro Aota <naohiro.aota@....com>,
        Alexander Monakov <amonakov@...ras.ru>,
        Mathias Krause <minipli@...glemail.com>,
        PaX Team <pageexec@...email.hu>,
        Brad Spengler <spender@...ecurity.net>,
        Laura Abbott <labbott@...hat.com>,
        Florian Weimer <fweimer@...hat.com>,
        kernel-hardening@...ts.openwall.com, linux-kbuild@...r.kernel.org,
        x86@...nel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, gcc@....gnu.org, notify@...nel.org
Subject: Re: [PATCH 3/5] gcc-plugins/stackleak: Add 'verbose' plugin parameter

On Wed, Jun 10, 2020 at 06:52:10PM +0300, Alexander Popov wrote:
> On 09.06.2020 21:47, Kees Cook wrote:
> > On Thu, Jun 04, 2020 at 04:49:55PM +0300, Alexander Popov wrote:
> >> Add 'verbose' plugin parameter for stackleak gcc plugin.
> >> It can be used for printing additional info about the kernel code
> >> instrumentation.
> >>
> >> For using it add the following to scripts/Makefile.gcc-plugins:
> >>   gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_STACKLEAK) \
> >>     += -fplugin-arg-stackleak_plugin-verbose
> >>
> >> Signed-off-by: Alexander Popov <alex.popov@...ux.com>
> > 
> > Acked-by: Kees Cook <keescook@...omium.org>
> 
> I see that I will change this patch after leaving alloca() support.
> I'm going to add debug printing about functions that call alloca().
> I have to omit your 'acked-by' for the changed patch, right?

If it changes dramatically, drop my Ack, yes. But since it's going via
my tree, my Ack is mostly just a quick email marker to say "yes, looks
good". :)

-- 
Kees Cook