The patch titled
Subject: pagemap-update-documentation-fix
has been added to the -mm tree. Its filename is
pagemap-update-documentation-fix.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/pagemap-update-documentation-fix.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/pagemap-update-documentation-fix.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Subject: pagemap-update-documentation-fix
various tweaks
Cc: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxxxxxx>
Cc: Mark Williamson <mwilliamson@xxxxxxxxxxxxxxxxx>
Cc: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/vm/pagemap.txt | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff -puN Documentation/vm/pagemap.txt~pagemap-update-documentation-fix Documentation/vm/pagemap.txt
--- a/Documentation/vm/pagemap.txt~pagemap-update-documentation-fix
+++ a/Documentation/vm/pagemap.txt
@@ -22,9 +22,9 @@ There are three components to pagemap:
* Bit 62 page swapped
* Bit 63 page present
- Since Linux 4.0 only users with the CAP_SYS_ADMIN capability can get PFNs:
- for unprivileged users from 4.0 till 4.2 open fails with -EPERM, starting
- from from 4.2 PFN field is zeroed if user has no CAP_SYS_ADMIN capability.
+ Since Linux 4.0 only users with the CAP_SYS_ADMIN capability can get PFNs.
+ In 4.0 and 4.1 opens by unprivileged fail with -EPERM. Starting from
+ 4.2 the PFN field is zeroed if the user does not have CAP_SYS_ADMIN.
Reason: information about PFNs helps in exploiting Rowhammer vulnerability.
If the page is not present but in swap, then the PFN contains an
_
Patches currently in -mm which might be from akpm@xxxxxxxxxxxxxxxxxxxx are
arch-alpha-kernel-systblss-remove-debug-check.patch
kernel-kthreadc-kthread_create_on_node-clarify-documentation.patch
scripts-spellingtxt-adding-misspelled-word-for-check-fix.patch
mm.patch
userfaultfd-change-the-read-api-to-return-a-uffd_msg-fix-2.patch
userfaultfd-change-the-read-api-to-return-a-uffd_msg-fix-2-fix.patch
userfaultfd-avoid-mmap_sem-read-recursion-in-mcopy_atomic-fix.patch
mm-mlock-refactor-mlock-munlock-and-munlockall-code-checkpatch-fixes.patch
mm-gup-add-mm_lock_present-checkpatch-fixes.patch
mm-mlock-introduce-vm_lockonfault-and-add-mlock-flags-to-enable-it-v4-checkpatch-fixes.patch
mm-mmap-add-mmap-flag-to-request-vm_lockonfault-v4-fix.patch
genalloc-add-name-arg-to-gen_pool_get-and-devm_gen_pool_create-fix.patch
genalloc-add-support-of-multiple-gen_pools-per-device-fix.patch
mm-make-gup-handle-pfn-mapping-unless-foll_get-is-requested-fix.patch
dax-revert-userfaultfd-change.patch
thp-prepare-for-dax-huge-pages-fix.patch
pagemap-add-mmap-exclusive-bit-for-marking-pages-mapped-only-here-fix.patch
pagemap-update-documentation-fix.patch
mm-show-proportional-swap-share-of-the-mapping-fix.patch
mm-improve-__gfp_noretry-comment-based-on-implementation-fix.patch
memcg-export-struct-mem_cgroup-fix.patch
memcg-export-struct-mem_cgroup-fix-2.patch
include-linux-page-flagsh-rename-macros-to-avoid-collisions.patch
mm-vmscan-fix-the-page-state-calculation-in-too_many_isolated.patch
x86-add-pmd_-for-thp-fix.patch
sparc-add-pmd_-for-thp-fix.patch
mm-support-madvisemadv_free-fix-2.patch
mm-dont-split-thp-page-when-syscall-is-called-fix-3.patch
mm-move-lazy-free-pages-to-inactive-list-fix-fix.patch
mm-move-lazy-free-pages-to-inactive-list-fix-fix-fix.patch
procfs-always-expose-proc-pid-map_files-and-make-it-readable-fix.patch
procfs-always-expose-proc-pid-map_files-and-make-it-readable-fix-fix.patch
linux-next.patch
linux-next-rejects.patch
drivers-gpu-drm-i915-intel_spritec-fix-build.patch
drivers-gpu-drm-i915-intel_tvc-fix-build.patch
net-netfilter-ipset-work-around-gcc-444-initializer-bug.patch
fs-seq_file-convert-int-seq_vprint-seq_printf-etc-returns-to-void-fix.patch
do_shared_fault-check-that-mmap_sem-is-held.patch
journal_add_journal_head-debug.patch
journal_add_journal_head-debug-fix.patch
kernel-forkc-export-kernel_thread-to-modules.patch
mutex-subsystem-synchro-test-module.patch
slab-leaks3-default-y.patch
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