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| author | Gleb Natapov <gleb@redhat.com> | 2012-12-11 15:14:12 +0200 |
|---|---|---|
| committer | Marcelo Tosatti <mtosatti@redhat.com> | 2012-12-11 21:00:28 -0200 |
| commit | 58b7825bc324da55415034a9f6ca5d716b8fd898 (patch) | |
| tree | 819453213ec9f5c68eae10088467f1abe75d9cb4 /arch | |
| parent | 0b26b588d97031fe8e16a35186220a6c14c89849 (diff) | |
| download | linux-58b7825bc324da55415034a9f6ca5d716b8fd898.tar.gz linux-58b7825bc324da55415034a9f6ca5d716b8fd898.tar.bz2 linux-58b7825bc324da55415034a9f6ca5d716b8fd898.zip | |
KVM: emulator: fix real mode segment checks in address linearization
In real mode CS register is writable, so do not #GP on write.
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kvm/emulate.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index 39171cb307ea..979869f70468 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -677,8 +677,9 @@ static int __linearize(struct x86_emulate_ctxt *ctxt, addr.seg); if (!usable) goto bad; - /* code segment or read-only data segment */ - if (((desc.type & 8) || !(desc.type & 2)) && write) + /* code segment in protected mode or read-only data segment */ + if ((((ctxt->mode != X86EMUL_MODE_REAL) && (desc.type & 8)) + || !(desc.type & 2)) && write) goto bad; /* unreadable code segment */ if (!fetch && (desc.type & 8) && !(desc.type & 2)) |