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arm64: mm: Fix and re-enable ARM64_SW_TTBR0_PAN

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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>
This commit is contained in:
Will Deacon
2017-08-10 13:58:16 +01:00
parent 158d495899
commit 27a921e757
10 changed files with 42 additions and 21 deletions
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2
arch/arm64/lib/clear_user.S
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@@ -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