diff options
Diffstat (limited to 'arch/x86/Kconfig')
| -rw-r--r-- | arch/x86/Kconfig | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index b89eb1f0c0d2..d936174f9d49 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1224,6 +1224,24 @@ config X86_VSYSCALL_EMULATION Disabling this option saves about 7K of kernel size and possibly 4K of additional runtime pagetable memory. +config X86_IOPL_IOPERM + bool "IOPERM and IOPL Emulation" + default y + ---help--- + 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. + config TOSHIBA tristate "Toshiba Laptop support" depends on X86_32 |