linux

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Will Deacon ffd1b63a58 KVM: arm64: Ensure user_mem_abort() return value is initialised

If a change in the MMU notifier sequence number forces user_mem_abort()
to return early when attempting to handle a stage-2 fault, we return
uninitialised stack to kvm_handle_guest_abort(), which could potentially
result in the injection of an external abort into the guest or a spurious
return to userspace. Neither or these are what we want to do.

Initialise 'ret' to 0 in user_mem_abort() so that bailing due to a
change in the MMU notrifier sequence number is treated as though the
fault was handled.

Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Alexandru Elisei <alexandru.elisei@arm.com>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Cc: Gavin Shan <gshan@redhat.com>
Cc: Alexandru Elisei <alexandru.elisei@arm.com>
Link: https://lore.kernel.org/r/20200930102442.16142-1-will@kernel.org

2020-10-02 09:25:25 +01:00

alpha

treewide: Use fallthrough pseudo-keyword

2020-08-23 17:36:59 -05:00

arc

ARC fixes for 5.9-rc4

2020-09-05 13:46:14 -07:00

arm

A set of fixes for lockdep, tracing and RCU:

2020-08-30 11:43:50 -07:00

arm64

KVM: arm64: Ensure user_mem_abort() return value is initialised