From the Linux kernel, the subsequent vulnerability has been settled: mm: Really don't attempt to NUMA-migrate COW internet pages that produce other employs Oded Gabbay stories that enabling NUMA balancing leads to corruption with his Gaudi accelerator test load: "All the details are during the bug, but the bottom line is always that by some means, this patch brings about corruption in the event the numa balancing attribute is enabled AND we don't use procedure affinity AND we use GUP to pin internet pages so our accelerator can DMA to/from technique memory. Either disabling numa balancing, applying course of action affinity to bind to specific numa-node or reverting this patch will cause the bug to disappear" and Oded bisected the issue to commit 09854ba94c6a ("mm: do_wp_page() simplification"). Now, the NUMA balancing shouldn't in fact be changing the writability of a page, and therefore shouldn't matter for COW. Nevertheless it seems it does. Suspicious. Nonetheless, despite that, the ailment for enabling NUMA faults in change_pte_range() is nonsensical.
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It uses "page_mapcount(site)" to choose if a COW website page need to be NUMA-guarded or not, and that makes Unquestionably no sense. The number of mappings a website page has is irrelevant: not merely does GUP get a reference to a website page as in Oded's circumstance, but the opposite mappings migth be paged out and the sole reference to them could well be from the website page depend. Considering the fact that we must always under no circumstances seek to NUMA-balance a web site that we won't shift anyway as a result of other references, just fix the code to employ 'page_count()'. Oded confirms that that fixes his challenge. Now, this does suggest that something in NUMA balancing ends up modifying webpage protections (apart from the apparent one of creating the page inaccessible to get the NUMA faulting details). Or else the COW simplification would not matter - considering the fact that undertaking the GUP within the page would ensure It is really writable. The cause of that permission transform would be excellent to determine much too, website since it Obviously leads to spurious COW gatherings - but fixing the nonsensical check that just occurred to work in advance of is obviously the CorrectThing(tm) to perform No matter.
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