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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>,
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Naohiro Aota <naohiro.aota@....com>,
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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
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