From 6807c84652b0b7e2e198e50a9ad47ef41b236e59 Mon Sep 17 00:00:00 2001 From: Ingo Molnar <mingo@kernel.org> Date: Tue, 18 Apr 2017 11:08:12 +0200 Subject: [PATCH] x86: Enable KASLR by default KASLR is mature (and important) enough to be enabled by default on x86. Also enable it by default in the defconfigs. Acked-by: Thomas Gleixner <tglx@linutronix.de> Cc: Baoquan He <bhe@redhat.com> Cc: Borislav Petkov <bp@suse.de> Cc: Kees Cook <keescook@chromium.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Yinghai Lu <yinghai@kernel.org> Cc: dan.j.williams@intel.com Cc: dave.jiang@intel.com Cc: dyoung@redhat.com Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org> --- arch/x86/Kconfig | 6 +++--- arch/x86/configs/i386_defconfig | 2 ++ arch/x86/configs/x86_64_defconfig | 2 ++ 3 files changed, 7 insertions(+), 3 deletions(-) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index cc98d5a294eee2..dc12dddb40b2e1 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1966,7 +1966,7 @@ config RELOCATABLE config RANDOMIZE_BASE bool "Randomize the address of the kernel image (KASLR)" depends on RELOCATABLE - default n + default y ---help--- In support of Kernel Address Space Layout Randomization (KASLR), this randomizes the physical address at which the kernel image @@ -1996,7 +1996,7 @@ config RANDOMIZE_BASE theoretically possible, but the implementations are further limited due to memory layouts. - If unsure, say N. + If unsure, say Y. # Relocation on x86 needs some additional build support config X86_NEED_RELOCS @@ -2045,7 +2045,7 @@ config RANDOMIZE_MEMORY configuration have in average 30,000 different possible virtual addresses for each memory section. - If unsure, say N. + If unsure, say Y. config RANDOMIZE_MEMORY_PHYSICAL_PADDING hex "Physical memory mapping padding" if EXPERT diff --git a/arch/x86/configs/i386_defconfig b/arch/x86/configs/i386_defconfig index 5fa6ee2c2dde05..6cf79e1a683017 100644 --- a/arch/x86/configs/i386_defconfig +++ b/arch/x86/configs/i386_defconfig @@ -57,6 +57,8 @@ CONFIG_EFI=y CONFIG_HZ_1000=y CONFIG_KEXEC=y CONFIG_CRASH_DUMP=y +CONFIG_RANDOMIZE_BASE=y +CONFIG_RANDOMIZE_MEMORY=y # CONFIG_COMPAT_VDSO is not set CONFIG_HIBERNATION=y CONFIG_PM_DEBUG=y diff --git a/arch/x86/configs/x86_64_defconfig b/arch/x86/configs/x86_64_defconfig index 7ef4a099defcda..8a9521b6a5376c 100644 --- a/arch/x86/configs/x86_64_defconfig +++ b/arch/x86/configs/x86_64_defconfig @@ -55,6 +55,8 @@ CONFIG_EFI=y CONFIG_HZ_1000=y CONFIG_KEXEC=y CONFIG_CRASH_DUMP=y +CONFIG_RANDOMIZE_BASE=y +CONFIG_RANDOMIZE_MEMORY=y # CONFIG_COMPAT_VDSO is not set CONFIG_HIBERNATION=y CONFIG_PM_DEBUG=y -- GitLab