Date: Fri, 23 Oct 2009 16:16:01 -0400 (EDT) From: Josh Bressers <bressers@...hat.com> To: oss-security@...ts.openwall.com Cc: "Steven M. Christey" <coley@...us.mitre.org> Subject: Re: CVE request: kvm: integer overflow in kvm_dev_ioctl_get_supported_cpuid() Please use CVE-2009-3638 for this. Thanks. -- JB ----- "Eugene Teo" <eugeneteo@...nel.sg> wrote: > Quote from the upstream commit: > "The number of entries is multiplied by the entry size, which can > overflow on 32-bit hosts. Bound the entry count instead." > > if (cpuid->nent < 1) > goto out; > + if (cpuid->nent > KVM_MAX_CPUID_ENTRIES) > + cpuid->nent = KVM_MAX_CPUID_ENTRIES; > r = -ENOMEM; > cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry2) * > cpuid->nent); > if (!cpuid_entries) > > This one can be triggered if /dev/kvm is user accessible (which is > recommended...). This was introduced in v2.6.25-rc1, and fixed in > v2.6.32-rc4. Only on 32-bit host. > > References: > http://git.kernel.org/linus/0771671749b59a507b6da4efb931c44d9691e248 > http://git.kernel.org/linus/6a54435560efdab1a08f429a954df4d6c740bddf > https://bugzilla.redhat.com/show_bug.cgi?id=530515 > > Thanks, Eugene
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