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General informations

The Linux kernel configuration item CONFIG_X86_IOPL_IOPERM:

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This enables the ioperm() and iopl() syscalls which are necessary for legacy applications.

Legacy IOPL support is an overbroad mechanism which allows user space aside of accessing all 65536 I/O ports also to disable interrupts. To gain this access the caller needs CAP_SYS_RAWIO capabilities and permission from potentially active security modules.

The emulation restricts the functionality of the syscall to only allowing the full range I/O port access, but prevents the ability to disable interrupts from user space which would be granted if the hardware IOPL mechanism would be used.



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