]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
arm64: kernel: Save and restore UAO and addr_limit on exception entry
authorJames Morse <james.morse@arm.com>
Mon, 20 Jun 2016 17:28:01 +0000 (18:28 +0100)
committerWill Deacon <will.deacon@arm.com>
Thu, 7 Jul 2016 14:55:37 +0000 (15:55 +0100)
commite19a6ee2460bdd0d0055a6029383422773f9999a
treef8e7898101568c82617d7afd66e712b9f0538a0e
parent4c2e07c6a29e0129e975727b9f57eede813eea85
arm64: kernel: Save and restore UAO and addr_limit on exception entry

If we take an exception while at EL1, the exception handler inherits
the original context's addr_limit and PSTATE.UAO values. To be consistent
always reset addr_limit and PSTATE.UAO on (re-)entry to EL1. This
prevents accidental re-use of the original context's addr_limit.

Based on a similar patch for arm from Russell King.

Cc: <stable@vger.kernel.org> # 4.6-
Acked-by: Will Deacon <will.deacon@arm.com>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
arch/arm64/include/asm/ptrace.h
arch/arm64/kernel/asm-offsets.c
arch/arm64/kernel/entry.S
arch/arm64/mm/fault.c