From: Linus Walleij <linus.walleij@linaro.org>
To: Jian Cai <jiancai@google.com>
Cc: "Nick Desaulniers" <ndesaulniers@google.com>,
"Manoj Gupta" <manojgupta@google.com>,
"Luis Lozano" <llozano@google.com>,
clang-built-linux <clang-built-linux@googlegroups.com>,
"Nathan Chancellor" <nathan@kernel.org>,
"David Laight" <David.Laight@aculab.com>,
"Will Deacon" <will@kernel.org>,
"Russell King" <rmk+kernel@armlinux.org.uk>,
"Russell King" <linux@armlinux.org.uk>,
"Catalin Marinas" <catalin.marinas@arm.com>,
"James Morris" <jmorris@namei.org>,
"Serge E. Hallyn" <serge@hallyn.com>,
"Arnd Bergmann" <arnd@arndb.de>,
"Masahiro Yamada" <masahiroy@kernel.org>,
"Krzysztof Kozlowski" <krzk@kernel.org>,
"Marc Zyngier" <maz@kernel.org>,
"Kees Cook" <keescook@chromium.org>,
"Andreas Färber" <afaerber@suse.de>,
"Ard Biesheuvel" <ardb@kernel.org>,
"Ingo Molnar" <mingo@kernel.org>,
"Andrew Morton" <akpm@linux-foundation.org>,
"Mike Rapoport" <rppt@kernel.org>,
"Mark Rutland" <mark.rutland@arm.com>,
"David Brazdil" <dbrazdil@google.com>,
"James Morse" <james.morse@arm.com>,
"Linux ARM" <linux-arm-kernel@lists.infradead.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
linux-security-module@vger.kernel.org
Subject: Re: [PATCH v5] ARM: Implement SLS mitigation
Date: Sat, 6 Mar 2021 13:25:36 +0100 [thread overview]
Message-ID: <CACRpkdYrqy78EfB_+UY0QtA0v0tD+_+O09Pod8-1Vd-p-VyMWA@mail.gmail.com> (raw)
In-Reply-To: <CA+SOCL+M5YfhygG=ogqvqp7y40v+32RiteGr=53THzwvdGugyA@mail.gmail.com>
On Fri, Mar 5, 2021 at 12:23 AM Jian Cai <jiancai@google.com> wrote:
> On Wed, Mar 3, 2021 at 7:04 AM Linus Walleij <linus.walleij@linaro.org> wrote:
> >
> > On Tue, Feb 23, 2021 at 3:36 AM Jian Cai <jiancai@google.com> wrote:
> >
> > > This patch adds CONFIG_HARDEN_SLS_ALL that can be used to turn on
> > > -mharden-sls=all, which mitigates the straight-line speculation
> > > vulnerability, speculative execution of the instruction following some
> > > unconditional jumps. Notice -mharden-sls= has other options as below,
> > > and this config turns on the strongest option.
> > >
> > > all: enable all mitigations against Straight Line Speculation that are implemented.
> > > none: disable all mitigations against Straight Line Speculation.
> > > retbr: enable the mitigation against Straight Line Speculation for RET and BR instructions.
> > > blr: enable the mitigation against Straight Line Speculation for BLR instructions.
> >
> > I heard about compiler protection for this, so nice to see it happening!
> >
> > Would you happen to know if there is any plan to do the same for GCC?
> > I know you folks at Google like LLVM, but if you know let us know.
>
> I think gcc also has these options.
> https://gcc.gnu.org/onlinedocs/gcc/AArch64-Options.html
And how does that work with this part of your patch:
+#define SLS_TEXT \
+ ALIGN_FUNCTION(); \
+ *(.text.__llvm_slsblr_thunk_*)
This does not look compiler agnostic?
Yours,
Linus Walleij
next prev parent reply other threads:[~2021-03-06 12:26 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-12 5:14 [PATCH] ARM: Implement Clang's SLS mitigation Jian Cai
2021-02-12 5:55 ` Nathan Chancellor
2021-02-12 10:41 ` David Laight
2021-02-12 19:52 ` [PATCH v2] " Jian Cai
2021-02-17 9:49 ` Will Deacon
2021-02-17 11:05 ` David Laight
2021-03-25 14:01 ` Linus Walleij
2021-02-17 18:20 ` Nick Desaulniers
2021-02-19 20:18 ` [PATCH v3] ARM: Implement " Jian Cai
2021-02-19 20:30 ` Nathan Chancellor
2021-02-19 23:08 ` [PATCH v4] " Jian Cai
2021-02-21 10:13 ` Russell King - ARM Linux admin
2021-02-22 11:58 ` Will Deacon
2021-02-22 21:50 ` Jian Cai
2021-02-23 10:04 ` Will Deacon
2021-03-03 15:18 ` Linus Walleij
2021-03-03 15:29 ` David Laight
2021-03-03 15:31 ` Linus Walleij
2021-02-23 2:31 ` [PATCH v5] " Jian Cai
2021-02-23 2:35 ` Jian Cai
2021-03-03 15:04 ` Linus Walleij
2021-03-04 23:22 ` Jian Cai
2021-03-06 12:25 ` Linus Walleij [this message]
2021-03-10 4:43 ` Jian Cai
2021-03-22 11:45 ` Linus Walleij
2021-03-23 22:39 ` Jian Cai
2021-03-05 0:53 ` [PATCH v6] " Jian Cai
2021-03-05 9:52 ` Will Deacon
2021-03-06 12:27 ` Linus Walleij
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