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Message-ID: <202006101302.AC218FA1@keescook>
Date: Wed, 10 Jun 2020 13:03:27 -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 2/5] gcc-plugins/stackleak: Use asm instrumentation to
avoid useless register saving
On Wed, Jun 10, 2020 at 06:47:14PM +0300, Alexander Popov wrote:
> On 09.06.2020 21:46, Kees Cook wrote:
> The inline asm statement that is used for instrumentation is arch-specific.
> Trying to add
> asm volatile("call stackleak_track_stack")
> in gcc plugin on aarch64 makes gcc break spectacularly.
Ah! Thank you, that eluded my eyes. :)
> I pass the target arch name to the plugin and check it explicitly to avoid that.
>
> Moreover, I'm going to create a gcc enhancement request for supporting
> no_caller_saved_registers attribute on aarch64.
For arm64 right now it looks like the plugin will just remain
"inefficient" in these cleanup, as before, yes?
--
Kees Cook
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