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Will Deacon e7ef4e829f arm64: SW PAN: Update saved ttbr0 value on enter_lazy_tlb ... commit d96cc49bff upstream. enter_lazy_tlb is called when a kernel thread rides on the back of another mm, due to a context switch or an explicit call to unuse_mm where a call to switch_mm is elided. In these cases, it's important to keep the saved ttbr value up to date with the active mm, otherwise we can end up with a stale value which points to a potentially freed page table. This patch implements enter_lazy_tlb for arm64, so that the saved ttbr0 is kept up-to-date with the active mm for kernel threads. Cc: Mark Rutland <mark.rutland@arm.com> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Vinayak Menon <vinmenon@codeaurora.org> Fixes: 39bc88e5e3 ("arm64: Disable TTBR0_EL1 during normal kernel execution") Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Reviewed-by: Mark Rutland <mark.rutland@arm.com> Reported-by: Vinayak Menon <vinmenon@codeaurora.org> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		History 2017-12-14 09:53:02 +01:00
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asm	arm64: SW PAN: Update saved ttbr0 value on enter_lazy_tlb	2017-12-14 09:53:02 +01:00
uapi/asm	License cleanup: add SPDX license identifier to uapi header files with a license	2017-11-02 11:20:11 +01:00