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Message-ID: <CAG48ez05JOvqzYGr3PvyQGwFURspFWvNvf-b8Y613PX0biug8w@mail.gmail.com>
Date: Thu, 4 Jun 2020 16:01:30 +0200
From: Jann Horn <jannh@...gle.com>
To: Alexander Popov <alex.popov@...ux.com>, Kees Cook <keescook@...omium.org>,
Elena Reshetova <elena.reshetova@...el.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 <kernel-hardening@...ts.openwall.com>, linux-kbuild@...r.kernel.org,
"the arch/x86 maintainers" <x86@...nel.org>, Linux ARM <linux-arm-kernel@...ts.infradead.org>,
kernel list <linux-kernel@...r.kernel.org>, gcc@....gnu.org, notify@...nel.org
Subject: Re: [PATCH 1/5] gcc-plugins/stackleak: Exclude alloca() from the
instrumentation logic
On Thu, Jun 4, 2020 at 3:51 PM Alexander Popov <alex.popov@...ux.com> wrote:
> Some time ago Variable Length Arrays (VLA) were removed from the kernel.
> The kernel is built with '-Wvla'. Let's exclude alloca() from the
> instrumentation logic and make it simpler. The build-time assertion
> against alloca() is added instead.
[...]
> + /* Variable Length Arrays are forbidden in the kernel */
> + gcc_assert(!is_alloca(stmt));
There is a patch series from Elena and Kees on the kernel-hardening
list that deliberately uses __builtin_alloca() in the syscall entry
path to randomize the stack pointer per-syscall - see
<https://lore.kernel.org/kernel-hardening/20200406231606.37619-4-keescook@chromium.org/>.
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