3.16.84-rc1 review patch. If anyone has any objections, please let me know.
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From: Marios Pomonis pomonis@google.com
commit 14e32321f3606e4b0970200b6e5e47ee6f1e6410 upstream.
This fixes a Spectre-v1/L1TF vulnerability in picdev_write(). It replaces index computations based on the (attacked-controlled) port number with constants through a minor refactoring.
Fixes: 85f455f7ddbe ("KVM: Add support for in-kernel PIC emulation")
Signed-off-by: Nick Finco nifi@google.com Signed-off-by: Marios Pomonis pomonis@google.com Reviewed-by: Andrew Honig ahonig@google.com Reviewed-by: Jim Mattson jmattson@google.com Signed-off-by: Paolo Bonzini pbonzini@redhat.com [bwh: Backported to 3.16: pic_{,un}lock() are called outside the switch] Signed-off-by: Ben Hutchings ben@decadent.org.uk --- --- a/arch/x86/kvm/i8259.c +++ b/arch/x86/kvm/i8259.c @@ -486,9 +486,11 @@ static int picdev_write(struct kvm_pic * switch (addr) { case 0x20: case 0x21: + pic_ioport_write(&s->pics[0], addr, data); + break; case 0xa0: case 0xa1: - pic_ioport_write(&s->pics[addr >> 7], addr, data); + pic_ioport_write(&s->pics[1], addr, data); break; case 0x4d0: case 0x4d1: