#include <linux/sched.h>
#include <linux/kernel.h>
+#include <linux/capability.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/ioport.h>
memset(bitmap, 0xff, IO_BITMAP_BYTES);
t->io_bitmap_ptr = bitmap;
+ set_thread_flag(TIF_IO_BITMAP);
}
/*
/*
* Sets the lazy trigger so that the next I/O operation will
* reload the correct bitmap.
+ * Reset the owner so that a process switch will not set
+ * tss->io_bitmap_base to IO_BITMAP_OFFSET.
*/
tss->io_bitmap_base = INVALID_IO_BITMAP_OFFSET_LAZY;
+ tss->io_bitmap_owner = NULL;
put_cpu();
volatile struct pt_regs * regs = (struct pt_regs *) &unused;
unsigned int level = regs->ebx;
unsigned int old = (regs->eflags >> 12) & 3;
+ struct thread_struct *t = ¤t->thread;
if (level > 3)
return -EINVAL;
if (!capable(CAP_SYS_RAWIO))
return -EPERM;
}
- regs->eflags = (regs->eflags &~ 0x3000UL) | (level << 12);
- /* Make sure we return the long way (not sysenter) */
- set_thread_flag(TIF_IRET);
+ t->iopl = level << 12;
+ regs->eflags = (regs->eflags & ~X86_EFLAGS_IOPL) | t->iopl;
+ set_iopl_mask(t->iopl);
return 0;
}