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| author | Matthew Wilcox (Oracle) <[email protected]> | 2023-09-20 04:09:58 +0000 |
|---|---|---|
| committer | Andrew Morton <[email protected]> | 2023-09-30 00:20:46 +0000 |
| commit | ce60f27bb62dfeb1bf827350520f34abc84e0933 (patch) | |
| tree | ba2bb32d49a6ed1df73a1f1e62392929b12c5e1f /mm/vmalloc.c | |
| parent | mm: report success more often from filemap_map_folio_range() (diff) | |
| download | kernel-ce60f27bb62dfeb1bf827350520f34abc84e0933.tar.gz kernel-ce60f27bb62dfeb1bf827350520f34abc84e0933.zip | |
mm: abstract moving to the next PFN
In order to fix the L1TF vulnerability, x86 can invert the PTE bits for
PROT_NONE VMAs, which means we cannot move from one PTE to the next by
adding 1 to the PFN field of the PTE. This results in the BUG reported at
[1].
Abstract advancing the PTE to the next PFN through a pte_next_pfn()
function/macro.
Link: https://lkml.kernel.org/r/[email protected]
Fixes: bcc6cc832573 ("mm: add default definition of set_ptes()")
Signed-off-by: Matthew Wilcox (Oracle) <[email protected]>
Reported-by: [email protected]
Closes: https://lkml.kernel.org/r/[email protected] [1]
Reviewed-by: Yin Fengwei <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: David Hildenbrand <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Diffstat (limited to 'mm/vmalloc.c')
0 files changed, 0 insertions, 0 deletions