- Fix potential segfault from too small MSR_COUNT (#528901)
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qemu-fix-msr-count-potential-segfault.patch
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67
qemu-fix-msr-count-potential-segfault.patch
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From 3ea6ac6fde5cd46d5d8593a493a75eb29e2ccc9b Mon Sep 17 00:00:00 2001
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From: Eduardo Habkost <ehabkost@redhat.com>
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Date: Wed, 14 Oct 2009 15:02:27 -0300
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Subject: [PATCH] fix MSR_COUNT for kvm_arch_save_regs()
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A new register was added to the load/save list on commit
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d283d5a65a2bdcc570065267be21848bd6fe3d78, but MSR_COUNT was not updated, leading
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to potential stack corruption on kvm_arch_save_regs().
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The following registers are saved by kvm_arch_save_regs():
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1) MSR_IA32_SYSENTER_CS
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2) MSR_IA32_SYSENTER_ESP
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3) MSR_IA32_SYSENTER_EIP
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4) MSR_STAR
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5) MSR_IA32_TSC
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6) MSR_VM_HSAVE_PA
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7) MSR_CSTAR (x86_64 only)
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8) MSR_KERNELGSBASE (x86_64 only)
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9) MSR_FMASK (x86_64 only)
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10) MSR_LSTAR (x86_64 only)
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(cherry picked from commit e7e5448ba387adc20be1cf08411a5b526d684299)
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Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
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Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
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Signed-off-by: Mark McLoughlin <markmc@redhat.com>
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Fedora-patch: qemu-fix-msr-count-potential-segfault.patch
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---
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qemu-kvm-x86.c | 6 ++++--
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1 files changed, 4 insertions(+), 2 deletions(-)
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diff --git a/qemu-kvm-x86.c b/qemu-kvm-x86.c
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index 8e0f0b2..89fe77c 100644
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--- a/qemu-kvm-x86.c
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+++ b/qemu-kvm-x86.c
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@@ -116,9 +116,9 @@ static int get_msr_entry(struct kvm_msr_entry *entry, CPUState *env)
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}
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#ifdef TARGET_X86_64
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-#define MSR_COUNT 9
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+#define MSR_COUNT 10
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#else
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-#define MSR_COUNT 5
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+#define MSR_COUNT 6
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#endif
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static void set_v8086_seg(struct kvm_segment *lhs, const SegmentCache *rhs)
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@@ -260,6 +260,7 @@ void kvm_arch_load_regs(CPUState *env)
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/* msrs */
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n = 0;
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+ /* Remember to increase MSR_COUNT if you add new registers below */
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set_msr_entry(&msrs[n++], MSR_IA32_SYSENTER_CS, env->sysenter_cs);
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set_msr_entry(&msrs[n++], MSR_IA32_SYSENTER_ESP, env->sysenter_esp);
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set_msr_entry(&msrs[n++], MSR_IA32_SYSENTER_EIP, env->sysenter_eip);
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@@ -435,6 +436,7 @@ void kvm_arch_save_regs(CPUState *env)
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/* msrs */
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n = 0;
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+ /* Remember to increase MSR_COUNT if you add new registers below */
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msrs[n++].index = MSR_IA32_SYSENTER_CS;
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msrs[n++].index = MSR_IA32_SYSENTER_ESP;
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msrs[n++].index = MSR_IA32_SYSENTER_EIP;
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--
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1.6.2.5
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@ -1,7 +1,7 @@
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Summary: QEMU is a FAST! processor emulator
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Name: qemu
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Version: 0.10.6
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Release: 7%{?dist}
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Release: 8%{?dist}
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# Epoch because we pushed a qemu-1.0 package
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Epoch: 2
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License: GPLv2+ and LGPLv2+ and BSD
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@ -37,6 +37,7 @@ Patch16: qemu-ppc-on-ppc.patch
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Patch17: qemu-use-statfs-to-determine-huge-page-size.patch
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Patch18: qemu-allow-pulseaudio-to-be-the-default.patch
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Patch19: qemu-fix-virtio-net-gso-support.patch
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Patch20: qemu-fix-msr-count-potential-segfault.patch
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BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
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BuildRequires: SDL-devel zlib-devel which texi2html gnutls-devel cyrus-sasl-devel
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@ -243,6 +244,7 @@ such as kvmtrace and kvm_stat.
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%patch17 -p1
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%patch18 -p1
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%patch19 -p1
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%patch20 -p1
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%build
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# systems like rhel build system does not have a recent enough linker so
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@ -485,6 +487,9 @@ fi
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%{_mandir}/man1/qemu-img.1*
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%changelog
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* Mon Oct 19 2009 Mark McLoughlin <markmc@redhat.com> - 2:0.10.6-8
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- Fix potential segfault from too small MSR_COUNT (#528901)
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* Mon Oct 5 2009 Mark McLoughlin <markmc@redhat.com> - 2:0.10.6-7
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- Use rtl8029 PXE rom for ne2k_pci, not ne (#526243)
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- Also, replace the etherboot-zroms-kvm pkg requires with file-based requires
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