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From: Linus Walleij <linus.walleij@linaro.org>
To: Russell King <linux@armlinux.org.uk>,
	 Sami Tolvanen <samitolvanen@google.com>,
	Kees Cook <keescook@chromium.org>,
	 Nathan Chancellor <nathan@kernel.org>,
	 Nick Desaulniers <ndesaulniers@google.com>,
	 Ard Biesheuvel <ardb@kernel.org>, Arnd Bergmann <arnd@arndb.de>
Cc: linux-arm-kernel@lists.infradead.org, llvm@lists.linux.dev,
	 Linus Walleij <linus.walleij@linaro.org>
Subject: [PATCH v2 1/9] ARM: Support CLANG CFI
Date: Thu, 07 Mar 2024 15:22:00 +0100	[thread overview]
Message-ID: <20240307-arm32-cfi-v2-1-cc74ea0306b3@linaro.org> (raw)
In-Reply-To: <20240307-arm32-cfi-v2-0-cc74ea0306b3@linaro.org>

Support Control Flow Integrity (CFI) when compiling with
CLANG.

In the as-of-writing LLVM CLANG implementation (v17)
the 32-bit ARM platform is supported by the generic CFI
implementation, which isn't tailored specifically for ARM32
but works well enough to enable the feature.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 arch/arm/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 0af6709570d1..1216656a40bc 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -34,6 +34,7 @@ config ARM
 	select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
 	select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT if CPU_V7
 	select ARCH_SUPPORTS_ATOMIC_RMW
+	select ARCH_SUPPORTS_CFI_CLANG
 	select ARCH_SUPPORTS_HUGETLBFS if ARM_LPAE
 	select ARCH_SUPPORTS_PER_VMA_LOCK
 	select ARCH_USE_BUILTIN_BSWAP

-- 
2.34.1


WARNING: multiple messages have this Message-ID (diff)
From: Linus Walleij <linus.walleij@linaro.org>
To: Russell King <linux@armlinux.org.uk>,
	 Sami Tolvanen <samitolvanen@google.com>,
	Kees Cook <keescook@chromium.org>,
	 Nathan Chancellor <nathan@kernel.org>,
	 Nick Desaulniers <ndesaulniers@google.com>,
	 Ard Biesheuvel <ardb@kernel.org>, Arnd Bergmann <arnd@arndb.de>
Cc: linux-arm-kernel@lists.infradead.org, llvm@lists.linux.dev,
	 Linus Walleij <linus.walleij@linaro.org>
Subject: [PATCH v2 1/9] ARM: Support CLANG CFI
Date: Thu, 07 Mar 2024 15:22:00 +0100	[thread overview]
Message-ID: <20240307-arm32-cfi-v2-1-cc74ea0306b3@linaro.org> (raw)
In-Reply-To: <20240307-arm32-cfi-v2-0-cc74ea0306b3@linaro.org>

Support Control Flow Integrity (CFI) when compiling with
CLANG.

In the as-of-writing LLVM CLANG implementation (v17)
the 32-bit ARM platform is supported by the generic CFI
implementation, which isn't tailored specifically for ARM32
but works well enough to enable the feature.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 arch/arm/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 0af6709570d1..1216656a40bc 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -34,6 +34,7 @@ config ARM
 	select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
 	select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT if CPU_V7
 	select ARCH_SUPPORTS_ATOMIC_RMW
+	select ARCH_SUPPORTS_CFI_CLANG
 	select ARCH_SUPPORTS_HUGETLBFS if ARM_LPAE
 	select ARCH_SUPPORTS_PER_VMA_LOCK
 	select ARCH_USE_BUILTIN_BSWAP

-- 
2.34.1


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

  reply	other threads:[~2024-03-07 14:22 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-03-07 14:21 [PATCH v2 0/9] CFI for ARM32 using LLVM Linus Walleij
2024-03-07 14:21 ` Linus Walleij
2024-03-07 14:22 ` Linus Walleij [this message]
2024-03-07 14:22   ` [PATCH v2 1/9] ARM: Support CLANG CFI Linus Walleij
2024-03-07 14:22 ` [PATCH v2 2/9] ARM: tlbflush: Make TLB flushes into static inlines Linus Walleij
2024-03-07 14:22   ` Linus Walleij
2024-03-07 14:22 ` [PATCH v2 3/9] ARM: bugs: Check in the vtable instead of defined aliases Linus Walleij
2024-03-07 14:22   ` Linus Walleij
2024-03-07 14:22 ` [PATCH v2 4/9] ARM: proc: Use inlines instead of defines Linus Walleij
2024-03-07 14:22   ` Linus Walleij
2024-03-07 14:22 ` [PATCH v2 5/9] ARM: delay: Turn delay functions into static inlines Linus Walleij
2024-03-07 14:22   ` Linus Walleij
2024-03-07 14:22 ` [PATCH v2 6/9] ARM: turn CPU cache flush " Linus Walleij
2024-03-07 14:22   ` Linus Walleij
2024-03-07 14:22 ` [PATCH v2 7/9] ARM: page: Turn highpage accesses " Linus Walleij
2024-03-07 14:22   ` Linus Walleij
2024-03-07 14:22 ` [PATCH v2 8/9] ARM: ftrace: Define ftrace_stub_graph Linus Walleij
2024-03-07 14:22   ` Linus Walleij
2024-03-07 14:22 ` [PATCH v2 9/9] ARM: KCFI: Allow permissive CFI mode Linus Walleij
2024-03-07 14:22   ` Linus Walleij
2024-03-07 18:58   ` Kees Cook
2024-03-07 18:58     ` Kees Cook

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