CONFIG_IO_STRICT_DEVMEM: Filter I/O access to /dev/mem

General informations

The Linux kernel configuration item CONFIG_IO_STRICT_DEVMEM:

• prompt: Filter I/O access to /dev/mem
• type: bool
• depends on: CONFIG_STRICT_DEVMEM
• defined in lib/Kconfig.debug
• found in Linux kernels: 4.5–4.20, 5.0–5.19, 6.0–6.12

Help text

If this option is disabled, you allow userspace (root) access to all io-memory regardless of whether a driver is actively using that range. Accidental access to this is obviously disastrous, but specific access can be used by people debugging kernel drivers.

If this option is switched on, the /dev/mem file only allows userspace access to *idle* io-memory ranges (see /proc/iomem) This may break traditional users of /dev/mem (dosemu, legacy X, etc...) if the driver using a given range cannot be disabled.

If in doubt, say Y.

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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