linux/Documentation/vm/index.rst
Pasha Tatashin df4e817b71 mm: page table check
Check user page table entries at the time they are added and removed.

Allows to synchronously catch memory corruption issues related to double
mapping.

When a pte for an anonymous page is added into page table, we verify
that this pte does not already point to a file backed page, and vice
versa if this is a file backed page that is being added we verify that
this page does not have an anonymous mapping

We also enforce that read-only sharing for anonymous pages is allowed
(i.e.  cow after fork).  All other sharing must be for file pages.

Page table check allows to protect and debug cases where "struct page"
metadata became corrupted for some reason.  For example, when refcnt or
mapcount become invalid.

Link: https://lkml.kernel.org/r/20211221154650.1047963-4-pasha.tatashin@soleen.com
Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Frederic Weisbecker <frederic@kernel.org>
Cc: Greg Thelen <gthelen@google.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Slaby <jirislaby@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Kees Cook <keescook@chromium.org>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Paul Turner <pjt@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sami Tolvanen <samitolvanen@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Wei Xu <weixugc@google.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2022-01-15 16:30:28 +02:00

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=====================================
Linux Memory Management Documentation
=====================================
This is a collection of documents about the Linux memory management (mm)
subsystem internals with different level of details ranging from notes and
mailing list responses for elaborating descriptions of data structures and
algorithms. If you are looking for advice on simply allocating memory, see the
:ref:`memory_allocation`. For controlling and tuning guides, see the
:doc:`admin guide <../admin-guide/mm/index>`.
.. toctree::
:maxdepth: 1
active_mm
arch_pgtable_helpers
balance
cleancache
damon/index
free_page_reporting
frontswap
highmem
hmm
hwpoison
hugetlbfs_reserv
ksm
memory-model
mmu_notifier
numa
overcommit-accounting
page_migration
page_frags
page_owner
page_table_check
remap_file_pages
slub
split_page_table_lock
transhuge
unevictable-lru
vmalloced-kernel-stacks
z3fold
zsmalloc