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powerpc fixes for 5.2 #6

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One fix for a bug in our context id handling on 64-bit hash CPUs, which can lead
 to unrelated processes being able to read/write to each other's virtual memory.
 See the commit for full details.
 
 That is the fix for CVE-2019-12817.
 
 This also adds a kernel selftest for the bug.
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Merge tag 'powerpc-5.2-6' into fixes

This merges the commits that were the fix for CVE-2019-12817, which was
developed under embargo. They have already been merged by Linus

Merge them into fixes now so that this branch contains all the fixes for
this release.
This commit is contained in:
Michael Ellerman 2019-07-01 13:59:40 +10:00
commit b7cbb52401
4 changed files with 139 additions and 10 deletions
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