diff options
Diffstat (limited to 'arch/x86/Kconfig')
| -rw-r--r-- | arch/x86/Kconfig | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index d6e1faa28c58..2aad1cd14cc5 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1254,6 +1254,38 @@ config X86_VSYSCALL_EMULATION Disabling this option saves about 7K of kernel size and possibly 4K of additional runtime pagetable memory. +choice + prompt "IOPL" + default X86_IOPL_EMULATION + +config X86_IOPL_EMULATION + bool "IOPL Emulation" + ---help--- + 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. + +config X86_IOPL_LEGACY + bool "IOPL Legacy" + ---help--- + Allow the full IOPL permissions, i.e. user space access to all + 65536 I/O ports and also the ability to disable interrupts, which + is overbroad and can result in system lockups. + +config X86_IOPL_NONE + bool "IOPL None" + ---help--- + Disable the IOPL permission syscall. That's the safest option as + no sane application should depend on this functionality. + +endchoice + config TOSHIBA tristate "Toshiba Laptop support" depends on X86_32 |