linux-kernel - Re: [PATCH v2 5/5] gcc-plugins/stackleak: Add 'verbose' plugin parameter

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Message-ID: <202006240740.5AF6369E53@keescook>
Date:   Wed, 24 Jun 2020 07:41:16 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Alexander Popov <alex.popov@...ux.com>
Cc:     Luis Chamberlain <mcgrof@...nel.org>, Jann Horn <jannh@...gle.com>,
        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>,
        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 v2 5/5] gcc-plugins/stackleak: Add 'verbose' plugin
 parameter

On Wed, Jun 24, 2020 at 04:09:20PM +0300, Alexander Popov wrote:
> On 24.06.2020 15:53, Luis Chamberlain wrote:
> > On Wed, Jun 24, 2020 at 03:33:30PM +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
> > 
> > Would be nice if we instead could pass an argument to make which lets
> > us enable this.
> 
> This feature is useful only for debugging stackleak gcc plugin.
> 
> The cflag that enables it is similar to -fplugin-arg-structleak_plugin-verbose,
> which is used for debugging the structleak plugin.
> 
> This debugging feature clutters the kernel build output, I don't think that many
> people will use it. So IMO creating a separate argument for make is not really
> needed.

Yup, agreed. The precedent for plugin verbosity is via CONFIGs. They're
not really general purpose enough to justify a "make" argument.

-- 
Kees Cook