This is a note to let you know that I've just added the patch titled arm64: mm: don't write garbage into TTBR1_EL1 register to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: arm64-mm-don-t-write-garbage-into-ttbr1_el1-register.patch and it can be found in the queue-4.14 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From ard.biesheuvel@xxxxxxxxxx Mon Feb 26 13:53:22 2018 From: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx> Date: Fri, 23 Feb 2018 18:29:02 +0000 Subject: arm64: mm: don't write garbage into TTBR1_EL1 register To: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx Cc: catalin.marinas@xxxxxxx, will.deacon@xxxxxxx, marc.zyngier@xxxxxxx, mark.rutland@xxxxxxx, nicolas.dechesne@xxxxxxxxxx, gregkh@xxxxxxxxxxxxxxxxxxx, Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx> Message-ID: <20180223182902.24873-1-ard.biesheuvel@xxxxxxxxxx> From: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx> Stable backport commit 173358a49173 ("arm64: kpti: Add ->enable callback to remap swapper using nG mappings") of upstream commit f992b4dfd58b did not survive the backporting process unscathed, and ends up writing garbage into the TTBR1_EL1 register, rather than pointing it to the zero page to disable translations. Fix that. Cc: <stable@xxxxxxxxxxxxxxx> #v4.14 Reported-by: Nicolas Dechesne <nicolas.dechesne@xxxxxxxxxx> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx> Acked-by: Will Deacon <will.deacon@xxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/arm64/mm/proc.S | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/arch/arm64/mm/proc.S +++ b/arch/arm64/mm/proc.S @@ -155,7 +155,7 @@ ENDPROC(cpu_do_switch_mm) .macro __idmap_cpu_set_reserved_ttbr1, tmp1, tmp2 adrp \tmp1, empty_zero_page - msr ttbr1_el1, \tmp2 + msr ttbr1_el1, \tmp1 isb tlbi vmalle1 dsb nsh Patches currently in stable-queue which might be from ard.biesheuvel@xxxxxxxxxx are queue-4.14/arm64-mm-don-t-write-garbage-into-ttbr1_el1-register.patch