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authorWill Deacon <will.deacon@arm.com>2017-08-10 15:58:16 +0300
committerWill Deacon <will.deacon@arm.com>2017-12-11 16:40:35 +0300
commit27a921e75711d924617269e0ba4adb8bae9fd0d1 (patch)
treebb4db9089fb6bb5606197222704a7522d2c9b2c6 /arch/arm64/lib
parent158d495899ce55db453f682a8ac8390d5a426578 (diff)
downloadlinux-27a921e75711d924617269e0ba4adb8bae9fd0d1.tar.xz
arm64: mm: Fix and re-enable ARM64_SW_TTBR0_PAN
With the ASID now installed in TTBR1, we can re-enable ARM64_SW_TTBR0_PAN by ensuring that we switch to a reserved ASID of zero when disabling user access and restore the active user ASID on the uaccess enable path. Reviewed-by: Mark Rutland <mark.rutland@arm.com> Tested-by: Laura Abbott <labbott@redhat.com> Tested-by: Shanker Donthineni <shankerd@codeaurora.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/lib')
-rw-r--r--arch/arm64/lib/clear_user.S2
-rw-r--r--arch/arm64/lib/copy_from_user.S2
-rw-r--r--arch/arm64/lib/copy_in_user.S2
-rw-r--r--arch/arm64/lib/copy_to_user.S2
4 files changed, 4 insertions, 4 deletions
diff --git a/arch/arm64/lib/clear_user.S b/arch/arm64/lib/clear_user.S
index e88fb99c1561..8f9c4641e706 100644
--- a/arch/arm64/lib/clear_user.S
+++ b/arch/arm64/lib/clear_user.S
@@ -30,7 +30,7 @@
* Alignment fixed up by hardware.
*/
ENTRY(__clear_user)
- uaccess_enable_not_uao x2, x3
+ uaccess_enable_not_uao x2, x3, x4
mov x2, x1 // save the size for fixup return
subs x1, x1, #8
b.mi 2f
diff --git a/arch/arm64/lib/copy_from_user.S b/arch/arm64/lib/copy_from_user.S
index 4b5d826895ff..69d86a80f3e2 100644
--- a/arch/arm64/lib/copy_from_user.S
+++ b/arch/arm64/lib/copy_from_user.S
@@ -64,7 +64,7 @@
end .req x5
ENTRY(__arch_copy_from_user)
- uaccess_enable_not_uao x3, x4
+ uaccess_enable_not_uao x3, x4, x5
add end, x0, x2
#include "copy_template.S"
uaccess_disable_not_uao x3
diff --git a/arch/arm64/lib/copy_in_user.S b/arch/arm64/lib/copy_in_user.S
index b24a830419ad..e442b531252a 100644
--- a/arch/arm64/lib/copy_in_user.S
+++ b/arch/arm64/lib/copy_in_user.S
@@ -65,7 +65,7 @@
end .req x5
ENTRY(raw_copy_in_user)
- uaccess_enable_not_uao x3, x4
+ uaccess_enable_not_uao x3, x4, x5
add end, x0, x2
#include "copy_template.S"
uaccess_disable_not_uao x3
diff --git a/arch/arm64/lib/copy_to_user.S b/arch/arm64/lib/copy_to_user.S
index 351f0766f7a6..318f15d5c336 100644
--- a/arch/arm64/lib/copy_to_user.S
+++ b/arch/arm64/lib/copy_to_user.S
@@ -63,7 +63,7 @@
end .req x5
ENTRY(__arch_copy_to_user)
- uaccess_enable_not_uao x3, x4
+ uaccess_enable_not_uao x3, x4, x5
add end, x0, x2
#include "copy_template.S"
uaccess_disable_not_uao x3