tree fb62ec15844bee34626b37a80ec6d82d6ee3f26a
parent 4d8efc2d5ee4c9ccfeb29ee8afd47a8660d0c0ce
author Will Deacon <will.deacon@arm.com> 1517844860 +0000
committer Catalin Marinas <catalin.marinas@arm.com> 1517957615 +0000

arm64: entry: Ensure branch through syscall table is bounded under speculation

In a similar manner to array_index_mask_nospec, this patch introduces an
assembly macro (mask_nospec64) which can be used to bound a value under
speculation. This macro is then used to ensure that the indirect branch
through the syscall table is bounded under speculation, with out-of-range
addresses speculating as calls to sys_io_setup (0).

Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>