diff options
Diffstat (limited to 'arch/x86/kernel/ioport.c')
| -rw-r--r-- | arch/x86/kernel/ioport.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/x86/kernel/ioport.c b/arch/x86/kernel/ioport.c index 589b3193f1020..9c3cf0944bce3 100644 --- a/arch/x86/kernel/ioport.c +++ b/arch/x86/kernel/ioport.c @@ -4,6 +4,7 @@ */ #include <linux/sched.h> +#include <linux/sched/task_stack.h> #include <linux/kernel.h> #include <linux/capability.h> #include <linux/errno.h> @@ -16,6 +17,7 @@ #include <linux/syscalls.h> #include <linux/bitmap.h> #include <asm/syscalls.h> +#include <asm/desc.h> /* * this changes the io permissions bitmap in the current task. @@ -45,6 +47,16 @@ asmlinkage long sys_ioperm(unsigned long from, unsigned long num, int turn_on) memset(bitmap, 0xff, IO_BITMAP_BYTES); t->io_bitmap_ptr = bitmap; set_thread_flag(TIF_IO_BITMAP); + + /* + * Now that we have an IO bitmap, we need our TSS limit to be + * correct. It's fine if we are preempted after doing this: + * with TIF_IO_BITMAP set, context switches will keep our TSS + * limit correct. + */ + preempt_disable(); + refresh_tss_limit(); + preempt_enable(); } /* |