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From: Sami Tolvanen <samitolvanen@google.com>
To: Nick Desaulniers <ndesaulniers@google.com>
Cc: Will Deacon <will@kernel.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	 Steven Rostedt <rostedt@goodmis.org>,
	Masami Hiramatsu <mhiramat@kernel.org>,
	 Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	Dave Martin <Dave.Martin@arm.com>,
	 Kees Cook <keescook@chromium.org>,
	Laura Abbott <labbott@redhat.com>,
	 Mark Rutland <mark.rutland@arm.com>,
	Jann Horn <jannh@google.com>,
	 Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>,
	 Masahiro Yamada <yamada.masahiro@socionext.com>,
	 clang-built-linux <clang-built-linux@googlegroups.com>,
	 Kernel Hardening <kernel-hardening@lists.openwall.com>,
	 Linux ARM <linux-arm-kernel@lists.infradead.org>,
	LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v3 13/17] arm64: preserve x18 when CPU is suspended
Date: Thu, 31 Oct 2019 10:27:26 -0700
Message-ID: <CABCJKudb2_OH5CRFm64rxv-VVnuOrO-ZOrXRHg8hR98Vj+BzVw@mail.gmail.com> (raw)
In-Reply-To: <CAKwvOd=kcPS1CU=AUjOPr7SAipPFhs-v_mXi=AbqW5Vp9XUaiw@mail.gmail.com>

On Thu, Oct 31, 2019 at 10:18 AM Nick Desaulniers
<ndesaulniers@google.com> wrote:
> > +#ifdef CONFIG_SHADOW_CALL_STACK
> > +       ldr     x18, [x0, #96]
> > +       str     xzr, [x0, #96]
>
> How come we zero out x0+#96, but not for other offsets? Is this str necessary?

It clears the shadow stack pointer from the sleep state buffer, which
is not strictly speaking necessary, but leaves one fewer place to find
it.

Sami

  reply index

Thread overview: 252+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-18 16:10 [PATCH 00/18] add support for Clang's Shadow Call Stack Sami Tolvanen
2019-10-18 16:10 ` [PATCH 01/18] arm64: mm: don't use x18 in idmap_kpti_install_ng_mappings Sami Tolvanen
2019-10-18 16:43   ` Nick Desaulniers
2019-10-18 16:10 ` [PATCH 02/18] arm64/lib: copy_page: avoid x18 register in assembler code Sami Tolvanen
2019-10-18 16:10 ` [PATCH 03/18] arm64: kvm: stop treating register x18 as caller save Sami Tolvanen
2019-10-21  6:19   ` Ard Biesheuvel
2019-10-22 17:22   ` Marc Zyngier
2019-10-22 21:45     ` Sami Tolvanen
2019-10-18 16:10 ` [PATCH 04/18] arm64: kernel: avoid x18 as an arbitrary temp register Sami Tolvanen
2019-10-18 16:10 ` [PATCH 05/18] arm64: kbuild: reserve reg x18 from general allocation by the compiler Sami Tolvanen
2019-10-18 17:32   ` Nick Desaulniers
2019-10-18 19:00     ` Sami Tolvanen
2019-10-21  6:12       ` Ard Biesheuvel
2019-10-21 20:43         ` Sami Tolvanen
2019-10-18 16:10 ` [PATCH 06/18] add support for Clang's Shadow Call Stack (SCS) Sami Tolvanen
2019-10-18 16:58   ` Joe Perches
2019-10-18 17:08   ` Nick Desaulniers
2019-10-18 17:11     ` Sami Tolvanen
2019-10-18 18:32       ` Miguel Ojeda
2019-10-18 20:33         ` Nick Desaulniers
2019-10-19  0:21           ` Miguel Ojeda
2019-10-18 17:42   ` Jann Horn
2019-10-18 17:56     ` Sami Tolvanen
2019-10-22 16:28   ` Mark Rutland
2019-10-22 16:30     ` Kees Cook
2019-10-22 16:49       ` Mark Rutland
2019-10-22 19:26     ` Sami Tolvanen
2019-10-24 13:28       ` Mark Rutland
2019-10-24 14:38         ` Masahiro Yamada
2019-10-23 16:59     ` Sami Tolvanen
2019-10-24  1:47       ` Masahiro Yamada
2019-10-24 12:04       ` Steven Rostedt
2019-10-24 22:17         ` Sami Tolvanen
2019-10-18 16:10 ` [PATCH 07/18] scs: add accounting Sami Tolvanen
2019-10-18 16:10 ` [PATCH 08/18] scs: add support for stack usage debugging Sami Tolvanen
2019-10-18 16:10 ` [PATCH 09/18] trace: disable function graph tracing with SCS Sami Tolvanen
2019-10-18 17:01   ` Steven Rostedt
2019-10-18 17:08     ` Sami Tolvanen
2019-10-21  6:15   ` Ard Biesheuvel
2019-10-18 16:10 ` [PATCH 10/18] kprobes: fix compilation without CONFIG_KRETPROBES Sami Tolvanen
2019-10-18 17:02   ` Steven Rostedt
2019-10-21  9:13     ` Masami Hiramatsu
2019-10-18 16:10 ` [PATCH 11/18] kprobes: disable kretprobes with SCS Sami Tolvanen
2019-10-18 17:04   ` Steven Rostedt
2019-10-21  9:15     ` Masami Hiramatsu
2019-10-18 16:10 ` [PATCH 12/18] arm64: reserve x18 only with Shadow Call Stack Sami Tolvanen
2019-10-18 21:23   ` Nick Desaulniers
2019-10-22 16:00     ` Mark Rutland
2019-10-22 16:27       ` Kees Cook
2019-10-18 16:10 ` [PATCH 13/18] arm64: preserve x18 when CPU is suspended Sami Tolvanen
2019-10-18 16:49   ` Nick Desaulniers
2019-10-18 17:05     ` Sami Tolvanen
2019-10-21 16:56   ` Mark Rutland
2019-10-21 22:43     ` Sami Tolvanen
2019-10-22 15:47       ` Mark Rutland
2019-10-18 16:10 ` [PATCH 14/18] arm64: efi: restore x18 if it was corrupted Sami Tolvanen
2019-10-21  6:20   ` Ard Biesheuvel
2019-10-21 22:39     ` Sami Tolvanen
2019-10-22  5:54       ` Ard Biesheuvel
2019-10-18 16:10 ` [PATCH 15/18] arm64: vdso: disable Shadow Call Stack Sami Tolvanen
2019-10-18 16:10 ` [PATCH 16/18] arm64: kprobes: fix kprobes without CONFIG_KRETPROBES Sami Tolvanen
2019-10-21  6:21   ` Ard Biesheuvel
2019-10-21 16:06     ` Kees Cook
2019-10-18 16:10 ` [PATCH 17/18] arm64: disable SCS for hypervisor code Sami Tolvanen
2019-10-18 16:10 ` [PATCH 18/18] arm64: implement Shadow Call Stack Sami Tolvanen
2019-10-18 17:12   ` Jann Horn
2019-10-18 17:18     ` Sami Tolvanen
2019-10-18 17:23     ` Mark Rutland
2019-10-18 17:35       ` Sami Tolvanen
2019-10-21 16:49         ` Mark Rutland
2019-10-21  9:28 ` [PATCH 00/18] add support for Clang's " Masami Hiramatsu
2019-10-24 22:51 ` [PATCH v2 00/17] " samitolvanen
2019-10-24 22:51   ` [PATCH v2 01/17] arm64: mm: don't use x18 in idmap_kpti_install_ng_mappings samitolvanen
2019-10-25  9:24     ` Mark Rutland
2019-10-24 22:51   ` [PATCH v2 02/17] arm64/lib: copy_page: avoid x18 register in assembler code samitolvanen
2019-10-25  9:41     ` Mark Rutland
2019-10-25 21:40       ` Sami Tolvanen
2019-10-24 22:51   ` [PATCH v2 03/17] arm64: kvm: stop treating register x18 as caller save samitolvanen
2019-10-24 22:51   ` [PATCH v2 04/17] arm64: kernel: avoid x18 as an arbitrary temp register samitolvanen
2019-10-25 10:02     ` Mark Rutland
2019-10-24 22:51   ` [PATCH v2 05/17] add support for Clang's Shadow Call Stack (SCS) samitolvanen
2019-10-25 10:56     ` Mark Rutland
2019-10-25 20:49       ` Sami Tolvanen
2019-10-28 16:35         ` Mark Rutland
2019-10-28 19:57           ` Kees Cook
2019-10-29 18:06             ` Sami Tolvanen
2019-10-25 16:22     ` Nick Desaulniers
2019-10-25 20:51       ` Sami Tolvanen
2019-10-26 15:57     ` Joe Perches
2019-10-28 15:19       ` Sami Tolvanen
2019-10-28 15:31         ` Miguel Ojeda
2019-10-28 16:15           ` Sami Tolvanen
2019-10-24 22:51   ` [PATCH v2 06/17] scs: add accounting samitolvanen
2019-10-24 22:51   ` [PATCH v2 07/17] scs: add support for stack usage debugging samitolvanen
2019-10-24 22:51   ` [PATCH v2 08/17] kprobes: fix compilation without CONFIG_KRETPROBES samitolvanen
2019-10-24 22:51   ` [PATCH v2 09/17] arm64: disable function graph tracing with SCS samitolvanen
2019-10-25 11:03     ` Mark Rutland
2019-10-29 17:45       ` Sami Tolvanen
2019-10-29 20:35         ` Nick Desaulniers
2019-10-24 22:51   ` [PATCH v2 10/17] arm64: disable kretprobes " samitolvanen
2019-10-24 22:51   ` [PATCH v2 11/17] arm64: reserve x18 from general allocation " samitolvanen
2019-10-24 22:51   ` [PATCH v2 12/17] arm64: preserve x18 when CPU is suspended samitolvanen
2019-10-24 22:51   ` [PATCH v2 13/17] arm64: efi: restore x18 if it was corrupted samitolvanen
2019-10-24 22:51   ` [PATCH v2 14/17] arm64: vdso: disable Shadow Call Stack samitolvanen
2019-10-24 22:51   ` [PATCH v2 15/17] arm64: kprobes: fix kprobes without CONFIG_KRETPROBES samitolvanen
2019-10-24 22:51   ` [PATCH v2 16/17] arm64: disable SCS for hypervisor code samitolvanen
2019-10-25  1:20     ` Steven Rostedt
2019-10-25  1:29     ` Masahiro Yamada
2019-10-25  1:42       ` Steven Rostedt
2019-10-25 19:24       ` Sami Tolvanen
2019-10-24 22:51   ` [PATCH v2 17/17] arm64: implement Shadow Call Stack samitolvanen
2019-10-31 16:46 ` [PATCH v3 00/17] add support for Clang's " samitolvanen
2019-10-31 16:46   ` [PATCH v3 01/17] arm64: mm: avoid x18 in idmap_kpti_install_ng_mappings samitolvanen
2019-10-31 16:46   ` [PATCH v3 02/17] arm64/lib: copy_page: avoid x18 register in assembler code samitolvanen
2019-10-31 16:46   ` [PATCH v3 03/17] arm64: kvm: stop treating register x18 as caller save samitolvanen
2019-11-01  3:48     ` Kees Cook
2019-10-31 16:46   ` [PATCH v3 04/17] arm64: kernel: avoid x18 __cpu_soft_restart samitolvanen
2019-11-01  3:47     ` Kees Cook
2019-10-31 16:46   ` [PATCH v3 05/17] add support for Clang's Shadow Call Stack (SCS) samitolvanen
2019-11-01  3:51     ` Kees Cook
2019-11-01 16:28       ` Sami Tolvanen
2019-10-31 16:46   ` [PATCH v3 06/17] scs: add accounting samitolvanen
2019-11-01  3:52     ` Kees Cook
2019-10-31 16:46   ` [PATCH v3 07/17] scs: add support for stack usage debugging samitolvanen
2019-11-01  3:55     ` Kees Cook
2019-11-01 16:32       ` Sami Tolvanen
2019-11-01 19:02         ` Kees Cook
2019-10-31 16:46   ` [PATCH v3 08/17] kprobes: fix compilation without CONFIG_KRETPROBES samitolvanen
2019-11-01  3:55     ` Kees Cook
2019-10-31 16:46   ` [PATCH v3 09/17] arm64: kprobes: fix kprobes " samitolvanen
2019-11-01  3:56     ` Kees Cook
2019-10-31 16:46   ` [PATCH v3 10/17] arm64: disable kretprobes with SCS samitolvanen
2019-11-01  3:56     ` Kees Cook
2019-10-31 16:46   ` [PATCH v3 11/17] arm64: disable function graph tracing " samitolvanen
2019-11-01  3:58     ` Kees Cook
2019-11-01 20:32       ` Sami Tolvanen
2019-10-31 16:46   ` [PATCH v3 12/17] arm64: reserve x18 from general allocation " samitolvanen
2019-10-31 17:11     ` Nick Desaulniers
2019-11-01  3:59     ` Kees Cook
2019-10-31 16:46   ` [PATCH v3 13/17] arm64: preserve x18 when CPU is suspended samitolvanen
2019-10-31 17:18     ` Nick Desaulniers
2019-10-31 17:27       ` Sami Tolvanen [this message]
2019-10-31 17:34         ` Nick Desaulniers
2019-10-31 17:42           ` Sami Tolvanen
2019-11-01  3:59           ` Kees Cook
2019-10-31 16:46   ` [PATCH v3 14/17] arm64: efi: restore x18 if it was corrupted samitolvanen
2019-11-01  4:00     ` Kees Cook
2019-10-31 16:46   ` [PATCH v3 15/17] arm64: vdso: disable Shadow Call Stack samitolvanen
2019-10-31 17:28     ` Nick Desaulniers
2019-11-01  4:01     ` Kees Cook
2019-10-31 16:46   ` [PATCH v3 16/17] arm64: disable SCS for hypervisor code samitolvanen
2019-11-01  3:46     ` Kees Cook
2019-11-01  4:02     ` Kees Cook
2019-10-31 16:46   ` [PATCH v3 17/17] arm64: implement Shadow Call Stack samitolvanen
2019-11-01  3:45     ` Kees Cook
2019-11-01 15:44       ` Sami Tolvanen
2019-11-01 22:11 ` [PATCH v4 00/17] add support for Clang's " Sami Tolvanen
2019-11-01 22:11   ` [PATCH v4 01/17] arm64: mm: avoid x18 in idmap_kpti_install_ng_mappings Sami Tolvanen
2019-11-01 22:11   ` [PATCH v4 02/17] arm64/lib: copy_page: avoid x18 register in assembler code Sami Tolvanen
2019-11-01 22:11   ` [PATCH v4 03/17] arm64: kvm: stop treating register x18 as caller save Sami Tolvanen
2019-11-04 11:04     ` Marc Zyngier
2019-11-04 13:30       ` Marc Zyngier
2019-11-04 11:51     ` Mark Rutland
2019-11-04 21:44       ` Sami Tolvanen
2019-11-01 22:11   ` [PATCH v4 04/17] arm64: kernel: avoid x18 __cpu_soft_restart Sami Tolvanen
2019-11-04 11:39     ` Mark Rutland
2019-11-04 16:44       ` Sami Tolvanen
2019-11-01 22:11   ` [PATCH v4 05/17] add support for Clang's Shadow Call Stack (SCS) Sami Tolvanen
2019-11-01 22:36     ` Miguel Ojeda
2019-11-04 12:31     ` Mark Rutland
2019-11-04 18:25       ` Sami Tolvanen
2019-11-01 22:11   ` [PATCH v4 06/17] scs: add accounting Sami Tolvanen
2019-11-04 13:13     ` Marc Zyngier
2019-11-04 16:42       ` Sami Tolvanen
2019-11-04 16:59         ` Marc Zyngier
2019-11-01 22:11   ` [PATCH v4 07/17] scs: add support for stack usage debugging Sami Tolvanen
2019-11-02 17:31     ` Kees Cook
2019-11-04 12:40     ` Mark Rutland
2019-11-04 21:35       ` Sami Tolvanen
2019-11-05  9:17         ` Mark Rutland
2019-11-01 22:11   ` [PATCH v4 08/17] kprobes: fix compilation without CONFIG_KRETPROBES Sami Tolvanen
2019-11-13 20:27     ` Steven Rostedt
2019-11-01 22:11   ` [PATCH v4 09/17] arm64: kprobes: fix kprobes " Sami Tolvanen
2019-11-01 22:11   ` [PATCH v4 10/17] arm64: disable kretprobes with SCS Sami Tolvanen
2019-11-04 17:04     ` Mark Rutland
2019-11-04 23:42       ` Sami Tolvanen
2019-11-05  9:04         ` Mark Rutland
2019-11-01 22:11   ` [PATCH v4 11/17] arm64: disable function graph tracing " Sami Tolvanen
2019-11-04 17:11     ` Mark Rutland
2019-11-04 23:44       ` Sami Tolvanen
2019-11-05  9:15         ` Mark Rutland
2019-11-05 20:00           ` Nick Desaulniers
2019-11-05 22:05           ` Sami Tolvanen
2019-11-01 22:11   ` [PATCH v4 12/17] arm64: reserve x18 from general allocation " Sami Tolvanen
2019-11-01 22:11   ` [PATCH v4 13/17] arm64: preserve x18 when CPU is suspended Sami Tolvanen
2019-11-04 13:20     ` Marc Zyngier
2019-11-04 21:38       ` Sami Tolvanen
2019-11-04 21:59         ` Nick Desaulniers
2019-11-05  0:02           ` Sami Tolvanen
2019-11-05 14:55             ` Marc Zyngier
2019-11-01 22:11   ` [PATCH v4 14/17] arm64: efi: restore x18 if it was corrupted Sami Tolvanen
2019-11-01 22:11   ` [PATCH v4 15/17] arm64: vdso: disable Shadow Call Stack Sami Tolvanen
2019-11-01 22:11   ` [PATCH v4 16/17] arm64: disable SCS for hypervisor code Sami Tolvanen
2019-11-01 22:11   ` [PATCH v4 17/17] arm64: implement Shadow Call Stack Sami Tolvanen
2019-11-05 23:55 ` [PATCH v5 00/14] add support for Clang's " Sami Tolvanen
2019-11-05 23:55   ` [PATCH v5 01/14] arm64: mm: avoid x18 in idmap_kpti_install_ng_mappings Sami Tolvanen
2019-11-05 23:55   ` [PATCH v5 02/14] arm64/lib: copy_page: avoid x18 register in assembler code Sami Tolvanen
2019-11-05 23:55   ` [PATCH v5 03/14] arm64: kvm: stop treating register x18 as caller save Sami Tolvanen
2019-11-05 23:55   ` [PATCH v5 04/14] arm64: kernel: avoid x18 in __cpu_soft_restart Sami Tolvanen
2019-11-05 23:55   ` [PATCH v5 05/14] add support for Clang's Shadow Call Stack (SCS) Sami Tolvanen
2019-11-15 15:37     ` Mark Rutland
2019-11-15 18:34       ` Sami Tolvanen
2019-11-05 23:56   ` [PATCH v5 06/14] scs: add accounting Sami Tolvanen
2019-11-05 23:56   ` [PATCH v5 07/14] scs: add support for stack usage debugging Sami Tolvanen
2019-11-05 23:56   ` [PATCH v5 08/14] arm64: disable function graph tracing with SCS Sami Tolvanen
2019-11-15 14:18     ` Mark Rutland
2019-11-05 23:56   ` [PATCH v5 09/14] arm64: reserve x18 from general allocation " Sami Tolvanen
2019-11-05 23:56   ` [PATCH v5 10/14] arm64: preserve x18 when CPU is suspended Sami Tolvanen
2019-11-06 20:39     ` Nick Desaulniers
2019-11-15 14:27     ` Mark Rutland
2019-11-05 23:56   ` [PATCH v5 11/14] arm64: efi: restore x18 if it was corrupted Sami Tolvanen
2019-11-06  4:45     ` Miguel Ojeda
2019-11-07 10:51       ` Ard Biesheuvel
2019-11-07 16:26         ` Sami Tolvanen
2019-11-05 23:56   ` [PATCH v5 12/14] arm64: vdso: disable Shadow Call Stack Sami Tolvanen
2019-11-15 14:43     ` Mark Rutland
2019-11-05 23:56   ` [PATCH v5 13/14] arm64: disable SCS for hypervisor code Sami Tolvanen
2019-11-15 14:46     ` Mark Rutland
2019-11-05 23:56   ` [PATCH v5 14/14] arm64: implement Shadow Call Stack Sami Tolvanen
2019-11-15 15:20     ` Mark Rutland
2019-11-15 20:19       ` Sami Tolvanen
2019-11-18 23:13         ` Sami Tolvanen
2019-11-12 23:44   ` [PATCH v5 00/14] add support for Clang's " Kees Cook
2019-11-13 12:03     ` Will Deacon
2019-11-13 18:33       ` Kees Cook
2019-11-15 14:16     ` Mark Rutland
2019-12-06 22:13 ` [PATCH v6 00/15] " Sami Tolvanen
2019-12-06 22:13   ` [PATCH v6 01/15] arm64: mm: avoid x18 in idmap_kpti_install_ng_mappings Sami Tolvanen
2019-12-06 22:13   ` [PATCH v6 02/15] arm64/lib: copy_page: avoid x18 register in assembler code Sami Tolvanen
2019-12-06 22:13   ` [PATCH v6 03/15] arm64: kvm: stop treating register x18 as caller save Sami Tolvanen
2019-12-06 22:13   ` [PATCH v6 04/15] arm64: kernel: avoid x18 in __cpu_soft_restart Sami Tolvanen
2019-12-06 22:13   ` [PATCH v6 05/15] add support for Clang's Shadow Call Stack (SCS) Sami Tolvanen
2019-12-06 22:13   ` [PATCH v6 06/15] scs: add accounting Sami Tolvanen
2019-12-06 22:13   ` [PATCH v6 07/15] scs: add support for stack usage debugging Sami Tolvanen
2019-12-06 22:13   ` [PATCH v6 08/15] arm64: disable function graph tracing with SCS Sami Tolvanen
2019-12-06 22:13   ` [PATCH v6 09/15] arm64: reserve x18 from general allocation " Sami Tolvanen
2019-12-06 22:13   ` [PATCH v6 10/15] arm64: preserve x18 when CPU is suspended Sami Tolvanen
2019-12-06 22:13   ` [PATCH v6 11/15] arm64: efi: restore x18 if it was corrupted Sami Tolvanen
2019-12-06 22:13   ` [PATCH v6 12/15] arm64: vdso: disable Shadow Call Stack Sami Tolvanen
2019-12-06 22:13   ` [PATCH v6 13/15] arm64: disable SCS for hypervisor code Sami Tolvanen
2019-12-06 22:13   ` [PATCH v6 14/15] arm64: implement Shadow Call Stack Sami Tolvanen
2019-12-06 22:13   ` [PATCH v6 15/15] arm64: scs: add shadow stacks for SDEI Sami Tolvanen

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