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| author | Vitaly Kuznetsov <vkuznets@redhat.com> | 2020-06-05 13:59:06 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-06-08 13:59:42 +0200 |
| commit | 25597f64c2f6fffa367d1e6ff4f62b9a751f9051 (patch) | |
| tree | a34ad21c8acf7065f9ac26da987c9bcfbd23ac6a /arch/x86/kvm | |
| parent | KVM: VMX: Properly handle kvm_read/write_guest_virt*() result (diff) | |
| download | linux-25597f64c2f6fffa367d1e6ff4f62b9a751f9051.tar.xz linux-25597f64c2f6fffa367d1e6ff4f62b9a751f9051.zip | |
Revert "KVM: x86: work around leak of uninitialized stack contents"
handle_vmptrst()/handle_vmread() stopped injecting #PF unconditionally
and switched to nested_vmx_handle_memory_failure() which just kills the
guest with KVM_EXIT_INTERNAL_ERROR in case of MMIO access, zeroing
'exception' in kvm_write_guest_virt_system() is not needed anymore.
This reverts commit 541ab2aeb28251bf7135c7961f3a6080eebcc705.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <20200605115906.532682-2-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm')
| -rw-r--r-- | arch/x86/kvm/x86.c | 7 |
1 files changed, 0 insertions, 7 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 13512baf6f6e..c26dd1363151 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -5647,13 +5647,6 @@ int kvm_write_guest_virt_system(struct kvm_vcpu *vcpu, gva_t addr, void *val, /* kvm_write_guest_virt_system can pull in tons of pages. */ vcpu->arch.l1tf_flush_l1d = true; - /* - * FIXME: this should call handle_emulation_failure if X86EMUL_IO_NEEDED - * is returned, but our callers are not ready for that and they blindly - * call kvm_inject_page_fault. Ensure that they at least do not leak - * uninitialized kernel stack memory into cr2 and error code. - */ - memset(exception, 0, sizeof(*exception)); return kvm_write_guest_virt_helper(addr, val, bytes, vcpu, PFERR_WRITE_MASK, exception); } |