CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL: zero-init everything passed by reference (very strong)

General informations

The Linux kernel configuration item CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL has multiple definitions:

zero-init everything passed by reference (very strong) found in security/Kconfig.hardening

The configuration item CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL:

• prompt: zero-init everything passed by reference (very strong)
• type: bool
• depends on: ( CONFIG_GCC_PLUGINS && ! CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO ) && (!( CONFIG_KASAN && CONFIG_KASAN_STACK ))
• defined in security/Kconfig.hardening
• found in Linux kernels: 5.15–5.19, 6.0–6.12

Help text

Zero-initialize any stack variables that may be passed by reference and had not already been explicitly initialized. This is intended to eliminate all classes of uninitialized stack variable exploits and information exposures.

As a side-effect, this keeps a lot of variables on the stack that can otherwise be optimized out, so combining this with KASAN_STACK can lead to a stack overflow and is disallowed.

zero-init anything passed by reference (very strong) found in security/Kconfig.hardening

The configuration item CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL:

• prompt: zero-init anything passed by reference (very strong)
• type: bool
• depends on: ( CONFIG_GCC_PLUGINS ) && (!( CONFIG_KASAN && CONFIG_KASAN_STACK ))
• defined in security/Kconfig.hardening
• found in Linux kernels: 5.2–5.14

Help text

Zero-initialize any stack variables that may be passed by reference and had not already been explicitly initialized. This is intended to eliminate all classes of uninitialized stack variable exploits and information exposures.

anything passed by reference found in scripts/gcc-plugins/Kconfig

The configuration item CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL:

• prompt: anything passed by reference
• type: bool
• depends on: (none)
• defined in scripts/gcc-plugins/Kconfig
• found in Linux kernels: 5.1

Help text

Zero-initialize any stack variables that may be passed by reference and had not already been explicitly initialized. This is intended to eliminate all classes of uninitialized stack variable exploits and information exposures.

Force initialize all struct type variables passed by reference found in scripts/gcc-plugins/Kconfig

The configuration item CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL:

• prompt: Force initialize all struct type variables passed by reference
• type: bool
• depends on: ( CONFIG_GCC_PLUGIN_STRUCTLEAK ) && (! CONFIG_COMPILE_TEST )
• defined in scripts/gcc-plugins/Kconfig
• found in Linux kernels: 4.19–4.20, 5.0

Help text

Zero initialize any struct type local variable that may be passed by reference without having been initialized.

Force initialize all struct type variables passed by reference found in arch/Kconfig

The configuration item CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL:

• prompt: Force initialize all struct type variables passed by reference
• type: bool
• depends on: ( CONFIG_GCC_PLUGIN_STRUCTLEAK ) && (! CONFIG_COMPILE_TEST )
• defined in arch/Kconfig
• found in Linux kernels: 4.14–4.18

Help text

Zero initialize any struct type local variable that may be passed by reference without having been initialized.

Hardware

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The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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