Paolo Bonzini de5b55f616 KVM: x86: fix conversion of addresses to linear in 32-bit protected mode ...

commit 0c1d77f4ba upstream.

Commit e8dd2d2d64 ("Silence compiler warning in arch/x86/kvm/emulate.c",
2015-09-06) broke boot of the Hurd.  The bug is that the "default:"
case actually could modify "la", but after the patch this change is
not reflected in *linear.

The bug is visible whenever a non-zero segment base causes the linear
address to wrap around the 4GB mark.

Fixes: e8dd2d2d64
Reported-by: Aurelien Jarno <aurelien@aurel32.net>
Tested-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2016-03-03 15:07:29 -08:00

142 KiB

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