FROMLIST: 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> (cherry picked from git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git commit 27a921e75711d924617269e0ba4adb8bae9fd0d1) Change-Id: I3b06e02766753c59fac975363a2ead5c5e45b8f3 [ghackmann@google.com: adjust context, applying asm-uaccess.h changes to uaccess.h] Signed-off-by:
Greg Hackmann <ghackmann@google.com> Signed-off-by:
Greg Kroah-Hartman <gregkh@google.com>
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