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[3.19.y-ckt,stable] Patch "arm/arm64: KVM: Fix ioctl error handling" has been added to the 3.19.y-ckt tree

Message ID 1458157292-6724-1-git-send-email-kamal@canonical.com
State New
Headers show

Commit Message

Kamal Mostafa March 16, 2016, 7:41 p.m. UTC 
This is a note to let you know that I have just added a patch titled

    arm/arm64: KVM: Fix ioctl error handling

to the linux-3.19.y-queue branch of the 3.19.y-ckt extended stable tree 
which can be found at:

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.19.y-queue

This patch is scheduled to be released in version 3.19.8-ckt17.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.19.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

---8<------------------------------------------------------------

From 2999c4ff76cd034c9662b4da22f75762b2f51cb9 Mon Sep 17 00:00:00 2001
From: "Michael S. Tsirkin" <mst@redhat.com>
Date: Sun, 28 Feb 2016 17:32:07 +0200
Subject: arm/arm64: KVM: Fix ioctl error handling

commit 4cad67fca3fc952d6f2ed9e799621f07666a560f upstream.

Calling return copy_to_user(...) in an ioctl will not
do the right thing if there's a pagefault:
copy_to_user returns the number of bytes not copied
in this case.

Fix up kvm to do
	return copy_to_user(...)) ?  -EFAULT : 0;

everywhere.

Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 arch/arm/kvm/guest.c   | 2 +-
 arch/arm64/kvm/guest.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

--
2.7.0
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Patch

diff --git a/arch/arm/kvm/guest.c b/arch/arm/kvm/guest.c
index 384bab6..949d9fa 100644
--- a/arch/arm/kvm/guest.c
+++ b/arch/arm/kvm/guest.c
@@ -173,7 +173,7 @@  static int get_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
 	u64 val;

 	val = kvm_arm_timer_get_reg(vcpu, reg->id);
-	return copy_to_user(uaddr, &val, KVM_REG_SIZE(reg->id));
+	return copy_to_user(uaddr, &val, KVM_REG_SIZE(reg->id)) ? -EFAULT : 0;
 }

 static unsigned long num_core_regs(void)
diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
index 9535bd5..d4e04d2 100644
--- a/arch/arm64/kvm/guest.c
+++ b/arch/arm64/kvm/guest.c
@@ -184,7 +184,7 @@  static int get_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
 	u64 val;

 	val = kvm_arm_timer_get_reg(vcpu, reg->id);
-	return copy_to_user(uaddr, &val, KVM_REG_SIZE(reg->id));
+	return copy_to_user(uaddr, &val, KVM_REG_SIZE(reg->id)) ? -EFAULT : 0;
 }

 /**