CVE-2013-4587 kvm: out-of-bounds access (rhbz 1030986 1042071)

This commit is contained in:
Josh Boyer 2013-12-12 16:23:58 -05:00
parent d856aba78d
commit 211cf9eef9
2 changed files with 100 additions and 0 deletions

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@ -0,0 +1,93 @@
Bugzilla: 1042071
Upstream-status: 3.13 and sent to stable
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From: Paolo Bonzini <pbonzini@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: gleb@redhat.com, kvm@vger.kernel.org, pmatouse@redhat.com,
Andy Honig <ahonig@google.com>, stable@vger.kernel.org
Subject: [PATCH] KVM: Improve create VCPU parameter
Date: Thu, 12 Dec 2013 21:36:51 +0100
Message-Id: <1386880614-23300-1-git-send-email-pbonzini@redhat.com>
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From: Andy Honig <ahonig@google.com>
In multiple functions the vcpu_id is used as an offset into a bitfield. Ag
malicious user could specify a vcpu_id greater than 255 in order to set or
clear bits in kernel memory. This could be used to elevate priveges in the
kernel. This patch verifies that the vcpu_id provided is less than 255.
The api documentation already specifies that the vcpu_id must be less than
max_vcpus, but this is currently not checked.
Reported-by: Andrew Honig <ahonig@google.com>
Cc: stable@vger.kernel.org
Signed-off-by: Andrew Honig <ahonig@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
virt/kvm/kvm_main.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index a0aa84b5941a..4f588bc94186 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1898,6 +1898,9 @@ static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
int r;
struct kvm_vcpu *vcpu, *v;
+ if (id >= KVM_MAX_VCPUS)
+ return -EINVAL;
+
vcpu = kvm_arch_vcpu_create(kvm, id);
if (IS_ERR(vcpu))
return PTR_ERR(vcpu);
--
1.8.3.1
--
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@ -723,6 +723,9 @@ Patch25173: KVM-x86-Convert-vapic-synchronization-to-_cached-functions.patch
#CVE-2013-6376 rhbz 1033106 1042099
Patch25174: KVM-x86-fix-guest-initiated-crash-with-x2apic.patch
#CVE-2013-4587 rhbz 1030986 1042071
Patch25175: KVM-Improve-create-VCPU-parameter.patch
# END OF PATCH DEFINITIONS
%endif
@ -1412,6 +1415,9 @@ ApplyPatch KVM-x86-Convert-vapic-synchronization-to-_cached-functions.patch
#CVE-2013-6376 rhbz 1033106 1042099
ApplyPatch KVM-x86-fix-guest-initiated-crash-with-x2apic.patch
#CVE-2013-4587 rhbz 1030986 1042071
ApplyPatch KVM-Improve-create-VCPU-parameter.patch
# END OF PATCH APPLICATIONS
%endif
@ -2225,6 +2231,7 @@ fi
# || ||
%changelog
* Thu Dec 12 2013 Josh Boyer <jwboyer@fedoraproject.org>
- CVE-2013-4587 kvm: out-of-bounds access (rhbz 1030986 1042071)
- CVE-2013-6376 kvm: BUG_ON in apic_cluster_id (rhbz 1033106 1042099)
- CVE-2013-6368 kvm: cross page vapic_addr access (rhbz 1032210 1042090)
- CVE-2013-6367 kvm: division by 0 in apic_get_tmcct (rhbz 1032207 1042081)