pagemap: make useable for non-privilege users
Get series with b4
b4 am 20150714152516.29844.69929.stgit@buzzVersions newest first · linked by author and title
- v4 Latest5 patches 16 repliesIn review
- v1 RFC0 of 3 patches 3 repliesSuperseded
Changes in v4 from the cover letter
* patches reordered: cleanup now in second patch
* update pagemap for hugetlb, add missing 'FILE' bit
* fix PM_PFRAME_BITS: its 55 not 54 as was in previous versions
Patches in v4 No applies recorded yet
| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 1/5 | pagemap: check permissions and capabilities at open timefs/ | +28 | 2 replies | |
| 2/5 | pagemap: switch to the new format and do some cleanupfs/ tools/ | +61 | 1 reply | |
| 3/5 | pagemap: rework hugetlb and thp reportfs/ | +44 | 5 replies | |
| 4/5 | pagemap: hide physical addresses from non-privileged usersfs/ | +14 | 3 replies | |
| 5/5 | pagemap: add mmap-exclusive bit for marking pages mapped only hereDocumentation/ fs/ tools/ | +25 | 2 replies |
Reviews trailers per patch
All 5 patches have a Reviewed-by or Acked-by.
| Patch | Mark Williamson | Naoya Horiguchi |
|---|---|---|
| 1/5 | R-b | R-b |
| 2/5 | R-b | |
| 3/5 | R-b | R-b |
| 4/5 | R-b | |
| 5/5 | Requested-by R-b | R-b |
Trailers given in replies are filled; those carried in the patches from earlier versions are outlined with dashes.
Cover letter [PATCHSET v4 0/5] pagemap: make useable for non-privilege users
This patchset makes pagemap useable again in the safe way (after row hammer bug it was made CAP_SYS_ADMIN-only). This patchset restores access for non-privileged users but hides PFNs from them.
Also it adds bit 'map-exlusive' which is set if page is mapped only here:
it helps in estimation of working set without exposing pfns and allows to distinguish CoWed and non-CoWed private anonymous pages.
Second patch removes page-shift bits and completes migration to the new pagemap format: flags soft-dirty and mmap-exlusive are available only in the new format.
Changes since v3:
* patches reordered: cleanup now in second patch
* update pagemap for hugetlb, add missing 'FILE' bit
* fix PM_PFRAME_BITS: its 55 not 54 as was in previous versions
---
Konstantin Khlebnikov (5):
pagemap: check permissions and capabilities at open time
pagemap: switch to the new format and do some cleanup
pagemap: rework hugetlb and thp report
pagemap: hide physical addresses from non-privileged users
pagemap: add mmap-exclusive bit for marking pages mapped only here
Documentation/vm/pagemap.txt | 3 fs/proc/task_mmu.c | 267 ++++++++++++++++++------------------------ tools/vm/page-types.c | 35 +++--- 3 files changed, 137 insertions(+), 168 deletions(-)
--
Konstantin
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