** Changed in: linux (Ubuntu)
Assignee: Tyler Hicks (tyhicks) => (unassigned)
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https://bugs.launchpad.net/bugs/1811162
Title:
Turn on CONFIG_REFCOUNT_FULL for non-x86 arches
Status in linux package in Ubuntu:
Triaged
Bug description:
The upstream kernel has added refcount protection, in two ways. For
arches that have provided a fast refcount_t implementation, they get
it automatically (this is signaled by ARCH_HAS_REFCOUNT, which as of
4.20 kernels, is only the x86 arch). For other arches, they can get
refcount protection via the CONFIG_REFCOUNT_FULL configure option. The
upstream arm64 and arm maintainers have enabled this configuration by
default for those arches, which has been carried into the ubuntu
kernel config. We should enable that for our other arches that do not
provide ARCH_HAS_REFCOUNT, namely ppc64el and s390x, to gain
protection parity with the rest of the architectures supported by
ubuntu kernels.
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