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/kernel/ioport.c | |
| 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/kernel/ioport.c')
| -rw-r--r-- | arch/x86/kernel/ioport.c | 26 |
1 files changed, 19 insertions, 7 deletions
diff --git a/arch/x86/kernel/ioport.c b/arch/x86/kernel/ioport.c index d5dcde972c42..8abeee0dd7bf 100644 --- a/arch/x86/kernel/ioport.c +++ b/arch/x86/kernel/ioport.c @@ -14,6 +14,8 @@ #include <asm/io_bitmap.h> #include <asm/desc.h> +#ifdef CONFIG_X86_IOPL_IOPERM + static atomic64_t io_bitmap_sequence; void io_bitmap_share(struct task_struct *tsk) @@ -172,13 +174,6 @@ SYSCALL_DEFINE1(iopl, unsigned int, level) struct thread_struct *t = ¤t->thread; unsigned int old; - /* - * Careful: the IOPL bits in regs->flags are undefined under Xen PV - * and changing them has no effect. - */ - if (IS_ENABLED(CONFIG_X86_IOPL_NONE)) - return -ENOSYS; - if (level > 3) return -EINVAL; @@ -200,3 +195,20 @@ SYSCALL_DEFINE1(iopl, unsigned int, level) return 0; } + +#else /* CONFIG_X86_IOPL_IOPERM */ + +long ksys_ioperm(unsigned long from, unsigned long num, int turn_on) +{ + return -ENOSYS; +} +SYSCALL_DEFINE3(ioperm, unsigned long, from, unsigned long, num, int, turn_on) +{ + return -ENOSYS; +} + +SYSCALL_DEFINE1(iopl, unsigned int, level) +{ + return -ENOSYS; +} +#endif |