Messages in this thread | | | Subject | [PATCHSET v4 0/5] pagemap: make useable for non-privilege users | From | Konstantin Khlebnikov <> | Date | Tue, 14 Jul 2015 18:37:34 +0300 |
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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
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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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