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add proposed fix for LP#1674838

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Patches and rationale by Seth Forshee[1]:

My testing shows that the "POWER9: Additional power9
patches" patches are responsible, two of them in particular:

 - mm: introduce page_vma_mapped_walk()
 - mm, ksm: convert write_protect_page() to use page_vma_mapped_walk()

These patches don't appear to be included for any
functionality they provide, but rather to make "mm/ksm:
handle protnone saved writes when making page write protect"
a clean cherry pick instead of a backport. But the backport
isn't that difficult, so as far as I can tell we can do away
with the other two patches.

1: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1674838/comments/108
This commit is contained in:
Fabian Grünbichler
2017-05-05 09:12:17 +02:00
parent 7f0f6370be
commit 2b834b083d
5 changed files with 543 additions and 0 deletions
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Makefile
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@@ -229,6 +229,10 @@ ${KERNEL_SRC}/README ${KERNEL_CFG_ORG}: ${KERNEL_SRC_SUBMODULE} | submodules
cd ${KERNEL_SRC}; patch -p1 < ../openvswitch-Set-internal-device-max-mtu-to-ETH_MAX_M.patch
cd ${KERNEL_SRC}; patch -p1 < ../CVE-2017-7979-0001-net_sched-nla_memdup_cookie-can-be-static.patch
cd ${KERNEL_SRC}; patch -p1 < ../CVE-2017-7979-0002-net-sched-actions-allocate-act-cookie-early.patch
cd ${KERNEL_SRC}; patch -p1 < ../swapops-0001-Revert-mm-ksm-handle-protnone-saved-writes-when-maki.patch
cd ${KERNEL_SRC}; patch -p1 < ../swapops-0002-Revert-mm-ksm-convert-write_protect_page-to-use-page.patch
cd ${KERNEL_SRC}; patch -p1 < ../swapops-0003-Revert-mm-introduce-page_vma_mapped_walk.patch
cd ${KERNEL_SRC}; patch -p1 < ../swapops-0004-mm-ksm-handle-protnone-saved-writes-when-making-page.patch
sed -i ${KERNEL_SRC}/Makefile -e 's/^EXTRAVERSION.*$$/EXTRAVERSION=${EXTRAVERSION}/'
touch $@