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uprobes: use pagesize-aligned virtual address when replacing pages
uprobes passes an unaligned page mapping address to folio_add_new_anon_rmap(), which ends up triggering a VM_BUG_ON() we recently extended in commit372cbd4d5a
("mm: non-pmd-mappable, large folios for folio_add_new_anon_rmap()"). Arguably, this is uprobes code doing something wrong; however, for the time being it would have likely worked in rmap code because __folio_set_anon() would set folio->index to the same value. Looking at __replace_page(), we'd also pass slightly wrong values to mmu_notifier_range_init(), page_vma_mapped_walk(), flush_cache_page(), ptep_clear_flush() and set_pte_at_notify(). I suspect most of them are fine, but let's just mark the introducing commit as the one needed fixing. I don't think CC stable is warranted. We'll add more sanity checks in rmap code separately, to make sure that we always get properly aligned addresses. Link: https://lkml.kernel.org/r/20240115100731.91007-1-david@redhat.com Fixes:c517ee744b
("uprobes: __replace_page() should not use page_address_in_vma()") Signed-off-by: David Hildenbrand <david@redhat.com> Reported-by: Jiri Olsa <jolsa@kernel.org> Closes: https://lkml.kernel.org/r/ZaMR2EWN-HvlCfUl@krava Tested-by: Jiri Olsa <jolsa@kernel.org> Reviewed-by: Ryan Roberts <ryan.roberts@arm.com> Acked-by: Oleg Nesterov <oleg@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Alexander Shishkin Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Ian Rogers <irogers@google.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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@ -537,7 +537,7 @@ retry:
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}
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}
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ret = __replace_page(vma, vaddr, old_page, new_page);
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ret = __replace_page(vma, vaddr & PAGE_MASK, old_page, new_page);
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if (new_page)
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put_page(new_page);
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put_old:
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