[v8,08/12] arm64: vdso: disable Shadow Call Stack

Message ID	20200219000817.195049-9-samitolvanen@google.com (mailing list archive)
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Headers	show Return-Path: <SRS0=T7oI=4H=lists.infradead.org=linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@kernel.org> DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E14F524656 Date: Tue, 18 Feb 2020 16:08:13 -0800 In-Reply-To: <20200219000817.195049-1-samitolvanen@google.com> Message-Id: <20200219000817.195049-9-samitolvanen@google.com> Mime-Version: 1.0 References: <20191018161033.261971-1-samitolvanen@google.com> <20200219000817.195049-1-samitolvanen@google.com> Subject: [PATCH v8 08/12] arm64: vdso: disable Shadow Call Stack From: Sami Tolvanen <samitolvanen@google.com> To: 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>, Mark Rutland <mark.rutland@arm.com>, james.morse@arm.com summary: Content analysis details: (-7.7 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [2607:f8b0:4864:20:0:0:0:449 listed in] [list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -7.5 USER_IN_DEF_DKIM_WL From: address is in the default DKIM white-list 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature -0.0 DKIMWL_WL_MED DKIMwl.org - Medium sender Precedence: list Cc: Kees Cook <keescook@chromium.org>, Jann Horn <jannh@google.com>, Masahiro Yamada <yamada.masahiro@socionext.com>, Marc Zyngier <maz@kernel.org>, kernel-hardening@lists.openwall.com, Nick Desaulniers <ndesaulniers@google.com>, linux-kernel@vger.kernel.org, Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>, clang-built-linux@googlegroups.com, Sami Tolvanen <samitolvanen@google.com>, Laura Abbott <labbott@redhat.com>, Dave Martin <Dave.Martin@arm.com>, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" <linux-arm-kernel-bounces@lists.infradead.org> Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org
Series	add support for Clang's Shadow Call Stack \| expand [v8,00/12] add support for Clang's Shadow Call Stack [v8,01/12] add support for Clang's Shadow Call Stack (SCS) [v8,02/12] scs: add accounting [v8,03/12] scs: add support for stack usage debugging [v8,04/12] scs: disable when function graph tracing is enabled [v8,05/12] arm64: reserve x18 from general allocation with SCS [v8,06/12] arm64: preserve x18 when CPU is suspended [v8,07/12] arm64: efi: restore x18 if it was corrupted [v8,08/12] arm64: vdso: disable Shadow Call Stack [v8,09/12] arm64: disable SCS for hypervisor code [v8,10/12] arm64: implement Shadow Call Stack [v8,11/12] arm64: scs: add shadow stacks for SDEI [v8,12/12] efi/libstub: disable SCS

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20200219000817.195049-9-samitolvanen@google.com (mailing list archive)

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Subject: [PATCH v8 08/12] arm64: vdso: disable Shadow Call Stack
From: Sami Tolvanen <samitolvanen@google.com>
To: 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>,
 Mark Rutland <mark.rutland@arm.com>,
 james.morse@arm.com
Precedence: list
Cc: Kees Cook <keescook@chromium.org>, Jann Horn <jannh@google.com>,
 Masahiro Yamada <yamada.masahiro@socionext.com>,
 Marc Zyngier <maz@kernel.org>,
 kernel-hardening@lists.openwall.com,
 Nick Desaulniers <ndesaulniers@google.com>, linux-kernel@vger.kernel.org,
 Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>,
 clang-built-linux@googlegroups.com, Sami Tolvanen <samitolvanen@google.com>,
 Laura Abbott <labbott@redhat.com>, Dave Martin <Dave.Martin@arm.com>,
 linux-arm-kernel@lists.infradead.org
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Series

add support for Clang's Shadow Call Stack | expand

Commit Message

Sami Tolvanen Feb. 19, 2020, 12:08 a.m. UTC

Shadow stacks are only available in the kernel, so disable SCS
instrumentation for the vDSO.

Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Will Deacon <will@kernel.org>
---
 arch/arm64/kernel/vdso/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/kernel/vdso/Makefile b/arch/arm64/kernel/vdso/Makefile
index dd2514bb1511..a87a4f11724e 100644
--- a/arch/arm64/kernel/vdso/Makefile
+++ b/arch/arm64/kernel/vdso/Makefile
@@ -25,7 +25,7 @@  ccflags-y += -DDISABLE_BRANCH_PROFILING
 
 VDSO_LDFLAGS := -Bsymbolic
 
-CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) -Os
+CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) -Os $(CC_FLAGS_SCS)
 KBUILD_CFLAGS			+= $(DISABLE_LTO)
 KASAN_SANITIZE			:= n
 UBSAN_SANITIZE			:= n

[v8,08/12] arm64: vdso: disable Shadow Call Stack

Commit Message

Patch