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From ac8540f237280b2e302949f15d229e13477245c7 Mon Sep 17 00:00:00 2001
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Message-Id: <ac8540f237280b2e302949f15d229e13477245c7@dist-git>
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From: Paolo Bonzini <pbonzini@redhat.com>
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Date: Tue, 12 Dec 2017 16:23:41 +0100
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Subject: [PATCH] util: introduce virHostCPUGetMicrocodeVersion
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This new API reads host's CPU microcode version from /proc/cpuinfo.
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Unfortunately, there is no other way of reading microcode version which
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would be usable from both system and session daemon.
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CVE-2017-5715
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
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---
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src/libvirt_private.syms | 1 +
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src/util/virhostcpu.c | 43 +++++++++++++++++++++++++++++++++++++++++++
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src/util/virhostcpu.h | 2 ++
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3 files changed, 46 insertions(+)
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diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
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index 85b15314a9..57999e77b0 100644
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--- a/src/libvirt_private.syms
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+++ b/src/libvirt_private.syms
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@@ -1861,6 +1861,7 @@ virHostCPUGetCount;
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virHostCPUGetInfo;
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virHostCPUGetKVMMaxVCPUs;
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virHostCPUGetMap;
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+virHostCPUGetMicrocodeVersion;
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virHostCPUGetOnline;
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virHostCPUGetOnlineBitmap;
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virHostCPUGetPresentBitmap;
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diff --git a/src/util/virhostcpu.c b/src/util/virhostcpu.c
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index bd58aa43df..a7ae7cd4cb 100644
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--- a/src/util/virhostcpu.c
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+++ b/src/util/virhostcpu.c
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@@ -1211,3 +1211,46 @@ virHostCPUGetKVMMaxVCPUs(void)
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return -1;
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}
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#endif /* HAVE_LINUX_KVM_H */
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+
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+
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+#ifdef __linux__
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+
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+unsigned int
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+virHostCPUGetMicrocodeVersion(void)
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+{
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+ char *outbuf = NULL;
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+ char *cur;
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+ unsigned int version = 0;
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+
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+ if (virFileReadHeaderQuiet(CPUINFO_PATH, 4096, &outbuf) < 0) {
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+ char ebuf[1024];
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+ VIR_DEBUG("Failed to read microcode version from %s: %s",
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+ CPUINFO_PATH, virStrerror(errno, ebuf, sizeof(ebuf)));
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+ return 0;
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+ }
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+
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+ /* Account for format 'microcode : XXXX'*/
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+ if (!(cur = strstr(outbuf, "microcode")) ||
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+ !(cur = strchr(cur, ':')))
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+ goto cleanup;
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+ cur++;
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+
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+ /* Linux places the microcode revision in a 32-bit integer, so
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+ * ui is fine for us too. */
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+ if (virStrToLong_ui(cur, &cur, 0, &version) < 0)
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+ goto cleanup;
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+
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+ cleanup:
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+ VIR_FREE(outbuf);
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+ return version;
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+}
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+
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+#else
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+
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+unsigned int
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+virHostCPUGetMicrocodeVersion(void)
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+{
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+ return 0;
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+}
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+
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+#endif
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diff --git a/src/util/virhostcpu.h b/src/util/virhostcpu.h
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index 67033de842..f9f3359288 100644
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--- a/src/util/virhostcpu.h
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+++ b/src/util/virhostcpu.h
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@@ -66,4 +66,6 @@ virBitmapPtr virHostCPUGetSiblingsList(unsigned int cpu);
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int virHostCPUGetOnline(unsigned int cpu, bool *online);
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+unsigned int virHostCPUGetMicrocodeVersion(void);
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+
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#endif /* __VIR_HOSTCPU_H__*/
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--
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2.15.1
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