From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH RESEND] kvm: Fix nonsense handling of compat ioctl
Date: Mon, 20 Aug 2012 15:43:43 +0100 [thread overview]
Message-ID: <20120820144330.6218.27112.stgit@localhost.localdomain> (raw)
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(-)
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index a2e85af..e47a7ca 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
+ kvm_vcpu_ioctl_set_sigmask(vcpu, NULL);
break;
}
default:
next reply other threads:[~2012-08-20 14:26 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-20 14:43 Alan Cox [this message]
2012-08-22 12:22 ` [PATCH RESEND] kvm: Fix nonsense handling of compat ioctl Avi Kivity
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