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-rw-r--r--arch/arm64/lib/clear_user.S8
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/arm64/lib/clear_user.S b/arch/arm64/lib/clear_user.S
index c17967fdf..a9723c71c 100644
--- a/arch/arm64/lib/clear_user.S
+++ b/arch/arm64/lib/clear_user.S
@@ -16,7 +16,11 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/linkage.h>
+
+#include <asm/alternative.h>
#include <asm/assembler.h>
+#include <asm/cpufeature.h>
+#include <asm/sysreg.h>
.text
@@ -29,6 +33,8 @@
* Alignment fixed up by hardware.
*/
ENTRY(__clear_user)
+ALTERNATIVE("nop", __stringify(SET_PSTATE_PAN(0)), ARM64_HAS_PAN, \
+ CONFIG_ARM64_PAN)
mov x2, x1 // save the size for fixup return
subs x1, x1, #8
b.mi 2f
@@ -48,6 +54,8 @@ USER(9f, strh wzr, [x0], #2 )
b.mi 5f
USER(9f, strb wzr, [x0] )
5: mov x0, #0
+ALTERNATIVE("nop", __stringify(SET_PSTATE_PAN(1)), ARM64_HAS_PAN, \
+ CONFIG_ARM64_PAN)
ret
ENDPROC(__clear_user)