]> git.baikalelectronics.ru Git - kernel.git/commit
arm64: Make USER_DS an inclusive limit
authorRobin Murphy <robin.murphy@arm.com>
Mon, 5 Feb 2018 15:34:18 +0000 (15:34 +0000)
committerCatalin Marinas <catalin.marinas@arm.com>
Tue, 6 Feb 2018 22:53:32 +0000 (22:53 +0000)
commitaceea5d1be8b52d1daee28cccbc07c000cca40f2
tree9a30fc16dfef70bdc8547ef696ba6be7fa273c87
parent56dd263265620a69a6ea17dd568825540639884b
arm64: Make USER_DS an inclusive limit

Currently, USER_DS represents an exclusive limit while KERNEL_DS is
inclusive. In order to do some clever trickery for speculation-safe
masking, we need them both to behave equivalently - there aren't enough
bits to make KERNEL_DS exclusive, so we have precisely one option. This
also happens to correct a longstanding false negative for a range
ending on the very top byte of kernel memory.

Mark Rutland points out that we've actually got the semantics of
addresses vs. segments muddled up in most of the places we need to
amend, so shuffle the {USER,KERNEL}_DS definitions around such that we
can correct those properly instead of just pasting "-1"s everywhere.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
arch/arm64/include/asm/processor.h
arch/arm64/include/asm/uaccess.h
arch/arm64/kernel/entry.S
arch/arm64/mm/fault.c