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Date: Sun, 08 Dec 2019 13:53:46 +0000 From: Ben Hutchings <ben@...adent.org.uk> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org CC: akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>, "Paolo Bonzini" <pbonzini@...hat.com>, syzbot+e3f4897236c4eeb8af4f@...kaller.appspotmail.com Subject: [PATCH 3.16 62/72] KVM: x86: fix out-of-bounds write in KVM_GET_EMULATED_CPUID (CVE-2019-19332) 3.16.79-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Paolo Bonzini <pbonzini@...hat.com> commit 433f4ba1904100da65a311033f17a9bf586b287e upstream. The bounds check was present in KVM_GET_SUPPORTED_CPUID but not KVM_GET_EMULATED_CPUID. Reported-by: syzbot+e3f4897236c4eeb8af4f@...kaller.appspotmail.com Fixes: 84cffe499b94 ("kvm: Emulate MOVBE", 2013-10-29) Signed-off-by: Paolo Bonzini <pbonzini@...hat.com> Signed-off-by: Ben Hutchings <ben@...adent.org.uk> --- arch/x86/kvm/cpuid.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -327,7 +327,7 @@ static inline int __do_cpuid_ent(struct r = -E2BIG; - if (*nent >= maxnent) + if (WARN_ON(*nent >= maxnent)) goto out; do_cpuid_1_ent(entry, function, index); @@ -599,6 +599,9 @@ out: static int do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 func, u32 idx, int *nent, int maxnent, unsigned int type) { + if (*nent >= maxnent) + return -E2BIG; + if (type == KVM_GET_EMULATED_CPUID) return __do_cpuid_ent_emulated(entry, func, idx, nent, maxnent);
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