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Subject[PATCH 4.14 02/54] arm64: mm: dont write garbage into TTBR1_EL1 register
4.14-stable review patch.  If anyone has any objections, please let me know.


From: Ard Biesheuvel <>

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: <> #v4.14
Reported-by: Nicolas Dechesne <>
Signed-off-by: Ard Biesheuvel <>
Acked-by: Will Deacon <>
Signed-off-by: Greg Kroah-Hartman <>
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
tlbi vmalle1
dsb nsh

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