diff mbox

[PATCHv2] kvm: Fix nonsense handling of compat ioctl

Message ID 20120822133400.20200.3726.stgit@localhost.localdomain (mailing list archive)
State New, archived
Headers show

Commit Message

Alan Cox Aug. 22, 2012, 1:34 p.m. UTC 
From: Alan Cox <alan@linux.intel.com>

KVM_SET_SIGNAL_MASK passed a NULL argument leaves the on stack signal
sets uninitialized. It then passes them through to
kvm_vcpu_ioctl_set_sigmask.

We should be passing a NULL in this case not translated garbage.

Signed-off-by: Alan Cox <alan@linux.intel.com>
---

 virt/kvm/kvm_main.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)


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Comments

Marcelo Tosatti Aug. 26, 2012, 6:12 p.m. UTC | #1 
On Wed, Aug 22, 2012 at 02:34:11PM +0100, Alan Cox wrote:
> From: Alan Cox <alan@linux.intel.com>
> 
> KVM_SET_SIGNAL_MASK passed a NULL argument leaves the on stack signal
> sets uninitialized. It then passes them through to
> kvm_vcpu_ioctl_set_sigmask.
> 
> We should be passing a NULL in this case not translated garbage.
> 
> Signed-off-by: Alan Cox <alan@linux.intel.com>

Applied, thanks.

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diff mbox

Patch

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index a2e85af..cd1fde9a 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1975,9 +1975,10 @@  static long kvm_vcpu_compat_ioctl(struct file *filp,
 			if (copy_from_user(&csigset, sigmask_arg->sigset,
 					   sizeof csigset))
 				goto out;
-		}
-		sigset_from_compat(&sigset, &csigset);
-		r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
+			sigset_from_compat(&sigset, &csigset);
+			r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
+		} else
+			r = kvm_vcpu_ioctl_set_sigmask(vcpu, NULL);
 		break;
 	}
 	default: