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df4e817b71
linux-next/arch
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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
..
alpha mm: remove redundant check about FAULT_FLAG_ALLOW_RETRY bit 2022-01-15 16:30:27 +02:00
arc mm: remove redundant check about FAULT_FLAG_ALLOW_RETRY bit 2022-01-15 16:30:27 +02:00
arm mm: remove redundant check about FAULT_FLAG_ALLOW_RETRY bit 2022-01-15 16:30:27 +02:00
arm64 mm: remove redundant check about FAULT_FLAG_ALLOW_RETRY bit 2022-01-15 16:30:27 +02:00
csky csky: fix typo of fpu config macro 2021-12-08 14:15:54 +08:00
h8300 Kbuild updates for v5.16 2021-11-08 09:15:45 -08:00
hexagon mm: remove redundant check about FAULT_FLAG_ALLOW_RETRY bit 2022-01-15 16:30:27 +02:00
ia64 mm: remove redundant check about FAULT_FLAG_ALLOW_RETRY bit 2022-01-15 16:30:27 +02:00
m68k mm: remove redundant check about FAULT_FLAG_ALLOW_RETRY bit 2022-01-15 16:30:27 +02:00
microblaze mm: remove redundant check about FAULT_FLAG_ALLOW_RETRY bit 2022-01-15 16:30:27 +02:00
mips mm: remove redundant check about FAULT_FLAG_ALLOW_RETRY bit 2022-01-15 16:30:27 +02:00
nds32 mm: remove redundant check about FAULT_FLAG_ALLOW_RETRY bit 2022-01-15 16:30:27 +02:00
nios2 mm: remove redundant check about FAULT_FLAG_ALLOW_RETRY bit 2022-01-15 16:30:27 +02:00
openrisc mm: remove redundant check about FAULT_FLAG_ALLOW_RETRY bit 2022-01-15 16:30:27 +02:00
parisc mm: remove redundant check about FAULT_FLAG_ALLOW_RETRY bit 2022-01-15 16:30:27 +02:00
powerpc mm: remove redundant check about FAULT_FLAG_ALLOW_RETRY bit 2022-01-15 16:30:27 +02:00
riscv mm: remove redundant check about FAULT_FLAG_ALLOW_RETRY bit 2022-01-15 16:30:27 +02:00
s390 mm: remove redundant check about FAULT_FLAG_ALLOW_RETRY bit 2022-01-15 16:30:27 +02:00
sh mm: remove redundant check about FAULT_FLAG_ALLOW_RETRY bit 2022-01-15 16:30:27 +02:00
sparc mm: remove redundant check about FAULT_FLAG_ALLOW_RETRY bit 2022-01-15 16:30:27 +02:00
um mm: remove redundant check about FAULT_FLAG_ALLOW_RETRY bit 2022-01-15 16:30:27 +02:00
x86 mm: move tlb_flush_pending inline helpers to mm_inline.h 2022-01-15 16:30:27 +02:00
xtensa mm: remove redundant check about FAULT_FLAG_ALLOW_RETRY bit 2022-01-15 16:30:27 +02:00
.gitignore
Kconfig mm: page table check 2022-01-15 16:30:28 +02:00