linux-kernel - [PATCH] hardening: Document INIT_STACK_ALL

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Message-ID: <293d29d6a0d1823165be97285c1bc73e90ee9db8.1736239070.git.geert+renesas@glider.be>
Date: Tue,  7 Jan 2025 09:38:57 +0100
From: Geert Uytterhoeven <geert+renesas@...der.be>
To: Kees Cook <kees@...nel.org>,
	"Gustavo A . R . Silva" <gustavoars@...nel.org>,
	Paul Moore <paul@...l-moore.com>,
	James Morris <jmorris@...ei.org>,
	"Serge E . Hallyn" <serge@...lyn.com>
Cc: linux-hardening@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH] hardening: Document INIT_STACK_ALL_PATTERN behavior with GCC

The help text for INIT_STACK_ALL_PATTERN documents the patterns used by
Clang, but lacks documentation for GCC.

Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
---
 security/Kconfig.hardening | 1 +
 1 file changed, 1 insertion(+)

diff --git a/security/Kconfig.hardening b/security/Kconfig.hardening
index c9d5ca3d8d08de23..b56e001e0c6a9533 100644
--- a/security/Kconfig.hardening
+++ b/security/Kconfig.hardening
@@ -127,6 +127,7 @@ choice
 		  repeating for all types and padding except float and double
 		  which use 0xFF repeating (-NaN). Clang on 32-bit uses 0xFF
 		  repeating for all types and padding.
+		  GCC uses 0xFE repeating for all types, and zero for padding.
 
 	config INIT_STACK_ALL_ZERO
 		bool "zero-init everything (strongest and safest)"
-- 
2.43.0