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@glider.be>
Link: https://lore.kernel.org/r/293d29d6a0d1823165be97285c1bc73e90ee9db8.1736239070.git.geert+renesas@glider.be
Signed-off-by: Kees Cook <kees@kernel.org>

diff --git a/security/Kconfig.hardening b/security/Kconfig.hardening
index c9d5ca3d8d08de237102f1ffe3f310636ae0d6ff..b56e001e0c6a95331a845413a945d94bf48f1ebe 100644 (file)
--- 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)"