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CONFIG_DEBUG_RODATA: Write protect kernel read-only data structures

General informations

The Linux kernel configuration item CONFIG_DEBUG_RODATA has multiple definitions:

Write protect kernel read-only data structures found in arch/i386/Kconfig.debug

The configuration item CONFIG_DEBUG_RODATA:

• prompt: Write protect kernel read-only data structures
• type: bool
• depends on: CONFIG_DEBUG_KERNEL
• defined in arch/i386/Kconfig.debug
• found in Linux kernels: 2.6.16–2.6.23

Help text

Mark the kernel read-only data as write-protected in the pagetables, in order to catch accidental (and incorrect) writes to such const data. This option may have a slight performance impact because a portion of the kernel code won't be covered by a 2MB TLB anymore. If in doubt, say "N".

Write protect kernel read-only data structures found in arch/parisc/Kconfig.debug

The configuration item CONFIG_DEBUG_RODATA:

• prompt: Write protect kernel read-only data structures
• type: bool
• depends on: CONFIG_DEBUG_KERNEL
• defined in arch/parisc/Kconfig.debug
• found in Linux kernels: 2.6.16–2.6.39, 3.0–3.9, 3.10-rc+HEAD

Help text

Mark the kernel read-only data as write-protected in the pagetables, in order to catch accidental (and incorrect) writes to such const data. This option may have a slight performance impact because a portion of the kernel code won't be covered by a TLB anymore. If in doubt, say "N".

Write protect kernel read-only data structures found in arch/x86/Kconfig.debug

The configuration item CONFIG_DEBUG_RODATA:

• prompt: Write protect kernel read-only data structures
• type: bool
• depends on: CONFIG_DEBUG_KERNEL
• defined in arch/x86/Kconfig.debug
• found in Linux kernels: 2.6.24–2.6.39, 3.0–3.9, 3.10-rc+HEAD

Help text

Mark the kernel read-only data as write-protected in the pagetables, in order to catch accidental (and incorrect) writes to such const data. This is recommended so that we can catch kernel bugs sooner. If in doubt, say "Y".

Write protect kernel read-only data structures found in arch/x86_64/Kconfig.debug

The configuration item CONFIG_DEBUG_RODATA:

• prompt: Write protect kernel read-only data structures
• type: bool
• depends on: CONFIG_DEBUG_KERNEL
• defined in arch/x86_64/Kconfig.debug
• found in Linux kernels: 2.6.16–2.6.23

Help text

Mark the kernel read-only data as write-protected in the pagetables, in order to catch accidental (and incorrect) writes to such const data. This option may have a slight performance impact because a portion of the kernel code won't be covered by a 2MB TLB anymore. If in doubt, say "N".

Hardware

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