Follow @Openwall on Twitter for new release announcements and other news
[<prev] [next>] [day] [month] [year] [list]
Date: Sun, 27 May 2018 17:59:27 +0200
From: <>
Cc: <>
Subject: Patch "kvm: x86: fix KVM_XEN_HVM_CONFIG ioctl" has been added to the 4.9-stable tree

This is a note to let you know that I've just added the patch titled

    kvm: x86: fix KVM_XEN_HVM_CONFIG ioctl

to the 4.9-stable tree which can be found at:;a=summary

The filename of the patch is:
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <> know about it.

>From foo@baz Sun May 27 17:33:37 CEST 2018
From: Paolo Bonzini <>
Date: Thu, 26 Oct 2017 15:45:47 +0200
Subject: kvm: x86: fix KVM_XEN_HVM_CONFIG ioctl

From: Paolo Bonzini <>

[ Upstream commit 51776043afa415435c7e4636204fbe4f7edc4501 ]

This ioctl is obsolete (it was used by Xenner as far as I know) but
still let's not break it gratuitously...  Its handler is copying
directly into struct kvm.  Go through a bounce buffer instead, with
the added benefit that we can actually do something useful with the
flags argument---the previous code was exiting with -EINVAL but still
doing the copy.

This technically is a userspace ABI breakage, but since no one should be
using the ioctl, it's a good occasion to see if someone actually

Cc: Kees Cook <>
Cc: Radim Krčmář <>
Signed-off-by: Paolo Bonzini <>
Signed-off-by: Kees Cook <>
Signed-off-by: Sasha Levin <>
Signed-off-by: Greg Kroah-Hartman <>
 arch/x86/kvm/x86.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -4131,13 +4131,14 @@ long kvm_arch_vm_ioctl(struct file *filp
+		struct kvm_xen_hvm_config xhc;
 		r = -EFAULT;
-		if (copy_from_user(&kvm->arch.xen_hvm_config, argp,
-				   sizeof(struct kvm_xen_hvm_config)))
+		if (copy_from_user(&xhc, argp, sizeof(xhc)))
 			goto out;
 		r = -EINVAL;
-		if (kvm->arch.xen_hvm_config.flags)
+		if (xhc.flags)
 			goto out;
+		memcpy(&kvm->arch.xen_hvm_config, &xhc, sizeof(xhc));
 		r = 0;

Patches currently in stable-queue which might be from are


Powered by blists - more mailing lists

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.