diff options
Diffstat (limited to 'drivers/lguest/x86')
| -rw-r--r-- | drivers/lguest/x86/core.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/lguest/x86/core.c b/drivers/lguest/x86/core.c index a125109446dc..39f64c95de18 100644 --- a/drivers/lguest/x86/core.c +++ b/drivers/lguest/x86/core.c | |||
| @@ -216,9 +216,10 @@ static int emulate_insn(struct lguest *lg) | |||
| 216 | * guest_pa just subtracts the Guest's page_offset. */ | 216 | * guest_pa just subtracts the Guest's page_offset. */ |
| 217 | unsigned long physaddr = guest_pa(lg, lg->regs->eip); | 217 | unsigned long physaddr = guest_pa(lg, lg->regs->eip); |
| 218 | 218 | ||
| 219 | /* The guest_pa() function only works for Guest kernel addresses, but | 219 | /* This must be the Guest kernel trying to do something, not userspace! |
| 220 | * that's all we're trying to do anyway. */ | 220 | * The bottom two bits of the CS segment register are the privilege |
| 221 | if (lg->regs->eip < lg->page_offset) | 221 | * level. */ |
| 222 | if ((lg->regs->cs & 3) != GUEST_PL) | ||
| 222 | return 0; | 223 | return 0; |
| 223 | 224 | ||
| 224 | /* Decoding x86 instructions is icky. */ | 225 | /* Decoding x86 instructions is icky. */ |