On Fri, 2024-05-24 at 15:19 +0100, Marc Zyngier wrote:

When userspace writes to once of the core registers, we make sure to narrow the corresponding GPRs if PSTATE indicates an AArch32 context.

The code tries to check whether the context is EL0 or EL1 so that it narrows the correct registers. But it does so by checking the full PSTATE instead of PSTATE.M.

As a consequence, and if we are restoring an AArch32 EL0 context in a 64bit guest, and that PSTATE has *any* bit set outside of PSTATE.M, we narrow *all* registers instead of only the first 15, destroying the 64bit state.

Obviously, this is not something the guest is likely to enjoy.

Correctly masking PSTATE to only evaluate PSTATE.M fixes it.

Fixes: 90c1f934ed71 ("KVM: arm64: Get rid of the AArch32 register mapping code") Reported-by: Nina Schoetterl-Glausch nsg@linux.ibm.com Signed-off-by: Marc Zyngier maz@kernel.org Cc: stable@vger.kernel.org

---

arch/arm64/kvm/guest.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c index e2f762d959bb..d9617b11f7a8 100644 --- a/arch/arm64/kvm/guest.c +++ b/arch/arm64/kvm/guest.c @@ -276,7 +276,7 @@ static int set_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) if (*vcpu_cpsr(vcpu) & PSR_MODE32_BIT) { int i, nr_reg;

• switch (*vcpu_cpsr(vcpu)) {
  

• switch (*vcpu_cpsr(vcpu) & PSR_AA32_MODE_MASK) {
  

  /*
  • Either we are dealing with user mode, and only the
  • first 15 registers (+ PC) must be narrowed to 32bit.

Reviewed-by: Nina Schoetterl-Glausch nsg@linux.ibm.com