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From: Linus Walleij <linus.walleij@linaro.org>
To: David Laight <David.Laight@aculab.com>
Cc: "Will Deacon" <will@kernel.org>, "Jian Cai" <jiancai@google.com>,
	"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>,
	"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>,
	"Kees Cook" <keescook@chromium.org>,
	"Ard Biesheuvel" <ardb@kernel.org>,
	"Andreas Färber" <afaerber@suse.de>,
	"Ingo Molnar" <mingo@kernel.org>, "Marc Zyngier" <maz@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 Mailing List" <linux-kernel@vger.kernel.org>,
	"linux-security-module@vger.kernel.org"
	<linux-security-module@vger.kernel.org>
Subject: Re: [PATCH v4] ARM: Implement SLS mitigation
Date: Wed, 3 Mar 2021 16:31:41 +0100	[thread overview]
Message-ID: <CACRpkdYM3x6pJU3Vi+EEHtC3wD1DkrtVbGDd3PFHWL0fxjSA9g@mail.gmail.com> (raw)
In-Reply-To: <49e8725f29ab4ecda6d669e9216bca29@AcuMS.aculab.com>

On Wed, Mar 3, 2021 at 4:29 PM David Laight <David.Laight@aculab.com> wrote:
> > On Tue, Feb 23, 2021 at 11:05 AM Will Deacon <will@kernel.org> wrote:

> > I wrote some suggestions on follow-ups in my reply, and I can
> > help out doing some of the patches, I think.
> >
> > Since ARM32 RET is mov pc, <>
> > git grep 'mov.*pc,' | wc -l gives 93 sites in arch/arm.
> > I suppose these need to come out:
> >
> > mov pc, lr
> > dsb(nsh);
> > isb();
>
> Won't that go horribly wrong for conditional returns?

It will so I would not insert it after those. It has to be
on a case-by-base basis, I am not planning any
search and replace operations.

Yours,
Linus Walleij

WARNING: multiple messages have this Message-ID (diff)
From: Linus Walleij <linus.walleij@linaro.org>
To: David Laight <David.Laight@aculab.com>
Cc: "Will Deacon" <will@kernel.org>, "Jian Cai" <jiancai@google.com>,
	"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>,
	"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>,
	"Kees Cook" <keescook@chromium.org>,
	"Ard Biesheuvel" <ardb@kernel.org>,
	"Andreas Färber" <afaerber@suse.de>,
	"Ingo Molnar" <mingo@kernel.org>, "Marc Zyngier" <maz@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 Mailing List" <linux-kernel@vger.kernel.org>,
	"linux-security-module@vger.kernel.org"
	<linux-security-module@vger.kernel.org>
Subject: Re: [PATCH v4] ARM: Implement SLS mitigation
Date: Wed, 3 Mar 2021 16:31:41 +0100	[thread overview]
Message-ID: <CACRpkdYM3x6pJU3Vi+EEHtC3wD1DkrtVbGDd3PFHWL0fxjSA9g@mail.gmail.com> (raw)
In-Reply-To: <49e8725f29ab4ecda6d669e9216bca29@AcuMS.aculab.com>

On Wed, Mar 3, 2021 at 4:29 PM David Laight <David.Laight@aculab.com> wrote:
> > On Tue, Feb 23, 2021 at 11:05 AM Will Deacon <will@kernel.org> wrote:

> > I wrote some suggestions on follow-ups in my reply, and I can
> > help out doing some of the patches, I think.
> >
> > Since ARM32 RET is mov pc, <>
> > git grep 'mov.*pc,' | wc -l gives 93 sites in arch/arm.
> > I suppose these need to come out:
> >
> > mov pc, lr
> > dsb(nsh);
> > isb();
>
> Won't that go horribly wrong for conditional returns?

It will so I would not insert it after those. It has to be
on a case-by-base basis, I am not planning any
search and replace operations.

Yours,
Linus Walleij

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  reply	other threads:[~2021-03-03 18:43 UTC|newest]

Thread overview: 58+ 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  5:14 ` Jian Cai
2021-02-12  5:55 ` Nathan Chancellor
2021-02-12  5:55   ` Nathan Chancellor
2021-02-12 10:41   ` David Laight
2021-02-12 10:41     ` David Laight
2021-02-12 19:52     ` [PATCH v2] " Jian Cai
2021-02-12 19:52       ` Jian Cai
2021-02-17  9:49       ` Will Deacon
2021-02-17  9:49         ` Will Deacon
2021-02-17 11:05         ` David Laight
2021-02-17 11:05           ` David Laight
2021-03-25 14:01         ` Linus Walleij
2021-03-25 14:01           ` Linus Walleij
2021-02-17 18:20       ` Nick Desaulniers
2021-02-17 18:20         ` Nick Desaulniers
2021-02-19 20:18       ` [PATCH v3] ARM: Implement " Jian Cai
2021-02-19 20:18         ` Jian Cai
2021-02-19 20:30         ` Nathan Chancellor
2021-02-19 20:30           ` Nathan Chancellor
2021-02-19 23:08         ` [PATCH v4] " Jian Cai
2021-02-19 23:08           ` Jian Cai
2021-02-21 10:13           ` Russell King - ARM Linux admin
2021-02-21 10:13             ` Russell King - ARM Linux admin
2021-02-22 11:58           ` Will Deacon
2021-02-22 11:58             ` Will Deacon
2021-02-22 21:50             ` Jian Cai
2021-02-22 21:50               ` Jian Cai
2021-02-23 10:04               ` Will Deacon
2021-02-23 10:04                 ` Will Deacon
2021-03-03 15:18                 ` Linus Walleij
2021-03-03 15:18                   ` Linus Walleij
2021-03-03 15:29                   ` David Laight
2021-03-03 15:29                     ` David Laight
2021-03-03 15:31                     ` Linus Walleij [this message]
2021-03-03 15:31                       ` Linus Walleij
2021-02-23  2:31           ` [PATCH v5] " Jian Cai
2021-02-23  2:31             ` Jian Cai
2021-02-23  2:35             ` Jian Cai
2021-02-23  2:35               ` Jian Cai
2021-03-03 15:04               ` Linus Walleij
2021-03-03 15:04                 ` Linus Walleij
2021-03-04 23:22                 ` Jian Cai
2021-03-04 23:22                   ` Jian Cai
2021-03-06 12:25                   ` Linus Walleij
2021-03-06 12:25                     ` Linus Walleij
2021-03-10  4:43                     ` Jian Cai
2021-03-10  4:43                       ` Jian Cai
2021-03-22 11:45                       ` Linus Walleij
2021-03-22 11:45                         ` Linus Walleij
2021-03-23 22:39                         ` Jian Cai
2021-03-23 22:39                           ` Jian Cai
2021-03-05  0:53               ` [PATCH v6] " Jian Cai
2021-03-05  0:53                 ` Jian Cai
2021-03-05  9:52                 ` Will Deacon
2021-03-05  9:52                   ` Will Deacon
2021-03-06 12:27                   ` Linus Walleij
2021-03-06 12:27                     ` Linus Walleij

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