if (!user_mode_vm(regs))
die(str, regs, err);
}
-
-/*
- * Perform the lazy TSS's I/O bitmap copy. If the TSS has an
- * invalid offset set (the LAZY one) and the faulting thread has
- * a valid I/O bitmap pointer, we copy the I/O bitmap in the TSS,
- * we set the offset field correctly and return 1.
- */
-static int lazy_iobitmap_copy(void)
-{
- struct thread_struct *thread;
- struct tss_struct *tss;
- int cpu;
-
- cpu = get_cpu();
- tss = &per_cpu(init_tss, cpu);
- thread = ¤t->thread;
-
- if (tss->x86_tss.io_bitmap_base == INVALID_IO_BITMAP_OFFSET_LAZY &&
- thread->io_bitmap_ptr) {
- memcpy(tss->io_bitmap, thread->io_bitmap_ptr,
- thread->io_bitmap_max);
- /*
- * If the previously set map was extending to higher ports
- * than the current one, pad extra space with 0xff (no access).
- */
- if (thread->io_bitmap_max < tss->io_bitmap_max) {
- memset((char *) tss->io_bitmap +
- thread->io_bitmap_max, 0xff,
- tss->io_bitmap_max - thread->io_bitmap_max);
- }
- tss->io_bitmap_max = thread->io_bitmap_max;
- tss->x86_tss.io_bitmap_base = IO_BITMAP_OFFSET;
- tss->io_bitmap_owner = thread;
- put_cpu();
-
- return 1;
- }
- put_cpu();
-
- return 0;
-}
#endif
static void __kprobes
conditional_sti(regs);
#ifdef CONFIG_X86_32
- if (lazy_iobitmap_copy()) {
- /* restart the faulting instruction */
- return;
- }
-
if (regs->flags & X86_VM_MASK)
goto gp_in_vm86;
#endif