CONFIG_ARM64_MODULE_PLTS: Use PLTs to allow module memory to spill over into vmalloc area

General informations

The Linux kernel configuration item CONFIG_ARM64_MODULE_PLTS has multiple definitions:

Use PLTs to allow module memory to spill over into vmalloc area found in arch/arm64/Kconfig

The configuration item CONFIG_ARM64_MODULE_PLTS:

• prompt: Use PLTs to allow module memory to spill over into vmalloc area
• type: bool
• depends on: CONFIG_MODULES
• defined in arch/arm64/Kconfig
• found in Linux kernels: 5.3–5.19, 6.0–6.4

Help text

Allocate PLTs when loading modules so that jumps and calls whose targets are too far away for their relative offsets to be encoded in the instructions themselves can be bounced via veneers in the module's PLT. This allows modules to be allocated in the generic vmalloc area after the dedicated module memory area has been exhausted.

When running with address space randomization (KASLR), the module region itself may be too far away for ordinary relative jumps and calls, and so in that case, module PLTs are required and cannot be disabled.

Specific errata workaround(s) might also force module PLTs to be enabled (ARM64_ERRATUM_843419).

found in arch/arm64/Kconfig

The configuration item CONFIG_ARM64_MODULE_PLTS:

• prompt:
• type: bool
• depends on: (none)
• defined in arch/arm64/Kconfig
• found in Linux kernels: 4.6–4.20, 5.0–5.2

Help text

(none)

Hardware

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This page is automaticly generated with free (libre, open) software lkddb(see lkddb-sources).

The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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