diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2019-11-12 21:40:33 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2019-11-16 11:24:06 +0100 |
| commit | 111e7b15cf10f6e973ccf537c70c66a5de539060 (patch) | |
| tree | 93f6a063e7829376797a00750c338338be0eee7d /arch/x86/Kconfig | |
| parent | a24ca9976843156eabbc5f2d798954b5674d1b61 (diff) | |
x86/ioperm: Extend IOPL config to control ioperm() as well
If iopl() is disabled, then providing ioperm() does not make much sense.
Rename the config option and disable/enable both syscalls with it. Guard
the code with #ifdefs where appropriate.
Suggested-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/Kconfig')
| -rw-r--r-- | arch/x86/Kconfig | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 1f926e396ec1..b162ce1482fc 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1254,10 +1254,13 @@ config X86_VSYSCALL_EMULATION Disabling this option saves about 7K of kernel size and possibly 4K of additional runtime pagetable memory. -config X86_IOPL_EMULATION - bool "IOPL Emulation" +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 |