diff options
Diffstat (limited to 'freed-ora/current/f18/0002-KVM-x86-fix-for-buffer-overflow-in-handling-of-MSR_K.patch')
| -rw-r--r-- | freed-ora/current/f18/0002-KVM-x86-fix-for-buffer-overflow-in-handling-of-MSR_K.patch | 41 |
1 files changed, 0 insertions, 41 deletions
diff --git a/freed-ora/current/f18/0002-KVM-x86-fix-for-buffer-overflow-in-handling-of-MSR_K.patch b/freed-ora/current/f18/0002-KVM-x86-fix-for-buffer-overflow-in-handling-of-MSR_K.patch deleted file mode 100644 index a4516e43e..000000000 --- a/freed-ora/current/f18/0002-KVM-x86-fix-for-buffer-overflow-in-handling-of-MSR_K.patch +++ /dev/null @@ -1,41 +0,0 @@ -From c300aa64ddf57d9c5d9c898a64b36877345dd4a9 Mon Sep 17 00:00:00 2001 -From: Andy Honig <ahonig@google.com> -Date: Mon, 11 Mar 2013 09:34:52 -0700 -Subject: [PATCH 2/3] KVM: x86: fix for buffer overflow in handling of - MSR_KVM_SYSTEM_TIME (CVE-2013-1796) - -If the guest sets the GPA of the time_page so that the request to update the -time straddles a page then KVM will write onto an incorrect page. The -write is done byusing kmap atomic to get a pointer to the page for the time -structure and then performing a memcpy to that page starting at an offset -that the guest controls. Well behaved guests always provide a 32-byte aligned -address, however a malicious guest could use this to corrupt host kernel -memory. - -Tested: Tested against kvmclock unit test. - -Signed-off-by: Andrew Honig <ahonig@google.com> -Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> ---- - arch/x86/kvm/x86.c | 5 +++++ - 1 file changed, 5 insertions(+) - -diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c -index f7c850b..2ade60c 100644 ---- a/arch/x86/kvm/x86.c -+++ b/arch/x86/kvm/x86.c -@@ -1959,6 +1959,11 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info) - /* ...but clean it before doing the actual write */ - vcpu->arch.time_offset = data & ~(PAGE_MASK | 1); - -+ /* Check that the address is 32-byte aligned. */ -+ if (vcpu->arch.time_offset & -+ (sizeof(struct pvclock_vcpu_time_info) - 1)) -+ break; -+ - vcpu->arch.time_page = - gfn_to_page(vcpu->kvm, data >> PAGE_SHIFT); - --- -1.8.1.4 - |
