CONFIG_HARDENED_USERCOPY_FALLBACK: Allow usercopy whitelist violations to fallback to object size

General informations

The Linux kernel configuration item CONFIG_HARDENED_USERCOPY_FALLBACK:

• prompt: Allow usercopy whitelist violations to fallback to object size
• type: bool
• depends on: CONFIG_HARDENED_USERCOPY
• defined in security/Kconfig
• found in Linux kernels: 4.16–4.20, 5.0–5.15

Help text

This is a temporary option that allows missing usercopy whitelists to be discovered via a WARN() to the kernel log, instead of rejecting the copy, falling back to non-whitelisted hardened usercopy that checks the slab allocation size instead of the whitelist size. This option will be removed once it seems like all missing usercopy whitelists have been identified and fixed. Booting with "slab_common.usercopy_fallback=Y/N" can change this setting.

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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