linux-kernel - [RFC PATCH] x86/Kconfig: Disable KASLR on debug builds

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Message-ID: <20231130120552.6735-1-bp@alien8.de>
Date:   Thu, 30 Nov 2023 13:05:52 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     X86 ML <x86@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>
Subject: [RFC PATCH] x86/Kconfig: Disable KASLR on debug builds

From: "Borislav Petkov (AMD)" <bp@...en8.de>

Having KASLR enabled makes debugging a kernel completely useless because
virtual addresses are not stable, leading to people poking at kernel
internals to have to go and rebuild with RANDOMIZE_BASE=off.

Just disable it on debugging builds where it is not needed anyway.

Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
---
 arch/x86/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index c456c9b1fc7c..da94354b1b75 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2159,7 +2159,7 @@ config RELOCATABLE
 
 config RANDOMIZE_BASE
 	bool "Randomize the address of the kernel image (KASLR)"
-	depends on RELOCATABLE
+	depends on RELOCATABLE && !DEBUG_KERNEL
 	default y
 	help
 	  In support of Kernel Address Space Layout Randomization (KASLR),
-- 
2.42.0.rc0.25.ga82fb66fed25