[PATCH 0/3 v2] Sync unmappings in vmalloc/ioremap areas

From: Joerg Roedel
Date: Wed Jul 17 2019 - 03:15:08 EST


Hi,

here is a small patch-set to sync unmappings in the
vmalloc/ioremap areas between page-tables in the system.

This is only needed x86-32 with !SHARED_KERNEL_PMD, which is
the case on a PAE kernel with PTI enabled.

On affected systems the missing sync causes old mappings to
persist in some page-tables, causing data corruption and
other undefined behavior.

Please review.

Thanks,

Joerg

Changes since v1:
- Added correct Fixes-tags to all patches

Joerg Roedel (3):
x86/mm: Check for pfn instead of page in vmalloc_sync_one()
x86/mm: Sync also unmappings in vmalloc_sync_one()
mm/vmalloc: Sync unmappings in vunmap_page_range()

arch/x86/mm/fault.c | 9 +++++----
mm/vmalloc.c | 2 ++
2 files changed, 7 insertions(+), 4 deletions(-)

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2.17.1