lguest: Guest int3 fix
Ron Minnich noticed that guest userspace gets a GPF when it tries to int3:
we need to copy the privilege level from the guest-supplied IDT to the real
IDT. int3 is the only common case where guest userspace expects to invoke
an interrupt, so that's the symptom of failing to do this.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
diff --git a/drivers/lguest/interrupts_and_traps.c b/drivers/lguest/interrupts_and_traps.c
index 0414ddf..a103906 100644
--- a/drivers/lguest/interrupts_and_traps.c
+++ b/drivers/lguest/interrupts_and_traps.c
@@ -406,7 +406,8 @@
* deliver_trap() to bounce it back into the Guest. */
static void default_idt_entry(struct desc_struct *idt,
int trap,
- const unsigned long handler)
+ const unsigned long handler,
+ const struct desc_struct *base)
{
/* A present interrupt gate. */
u32 flags = 0x8e00;
@@ -415,6 +416,10 @@
* the Guest to use the "int" instruction to trigger it. */
if (trap == LGUEST_TRAP_ENTRY)
flags |= (GUEST_PL << 13);
+ else if (base)
+ /* Copy priv. level from what Guest asked for. This allows
+ * debug (int 3) traps from Guest userspace, for example. */
+ flags |= (base->b & 0x6000);
/* Now pack it into the IDT entry in its weird format. */
idt->a = (LGUEST_CS<<16) | (handler&0x0000FFFF);
@@ -428,7 +433,7 @@
unsigned int i;
for (i = 0; i < ARRAY_SIZE(state->guest_idt); i++)
- default_idt_entry(&state->guest_idt[i], i, def[i]);
+ default_idt_entry(&state->guest_idt[i], i, def[i], NULL);
}
/*H:240 We don't use the IDT entries in the "struct lguest" directly, instead
@@ -442,6 +447,8 @@
/* We can simply copy the direct traps, otherwise we use the default
* ones in the Switcher: they will return to the Host. */
for (i = 0; i < ARRAY_SIZE(cpu->arch.idt); i++) {
+ const struct desc_struct *gidt = &cpu->arch.idt[i];
+
/* If no Guest can ever override this trap, leave it alone. */
if (!direct_trap(i))
continue;
@@ -449,12 +456,15 @@
/* Only trap gates (type 15) can go direct to the Guest.
* Interrupt gates (type 14) disable interrupts as they are
* entered, which we never let the Guest do. Not present
- * entries (type 0x0) also can't go direct, of course. */
- if (idt_type(cpu->arch.idt[i].a, cpu->arch.idt[i].b) == 0xF)
- idt[i] = cpu->arch.idt[i];
+ * entries (type 0x0) also can't go direct, of course.
+ *
+ * If it can't go direct, we still need to copy the priv. level:
+ * they might want to give userspace access to a software
+ * interrupt. */
+ if (idt_type(gidt->a, gidt->b) == 0xF)
+ idt[i] = *gidt;
else
- /* Reset it to the default. */
- default_idt_entry(&idt[i], i, def[i]);
+ default_idt_entry(&idt[i], i, def[i], gidt);
}
}