mm: open-code page_folio() in dump_page()

JIRA: https://issues.redhat.com/browse/RHEL-84184

This patch is a backport of the following upstream commit:
commit 6a7de1b
Author: Matthew Wilcox (Oracle) <[email protected]>
Date:   Mon Nov 25 20:17:19 2024 +0000

    mm: open-code page_folio() in dump_page()

    page_folio() calls page_fixed_fake_head() which will misidentify this page
    as being a fake head and load off the end of 'precise'.  We may have a
    pointer to a fake head, but that's OK because it contains the right
    information for dump_page().

    gcc-15 is smart enough to catch this with -Warray-bounds:

    In function 'page_fixed_fake_head',
        inlined from '_compound_head' at ../include/linux/page-flags.h:251:24,
        inlined from '__dump_page' at ../mm/debug.c:123:11:
    ../include/asm-generic/rwonce.h:44:26: warning: array subscript 9 is outside
    +array bounds of 'struct page[1]' [-Warray-bounds=]

    Link: https://lkml.kernel.org/r/[email protected]
    Fixes: fae7d83 ("mm: add __dump_folio()")
    Signed-off-by: Matthew Wilcox (Oracle) <[email protected]>
    Reported-by: Kees Cook <[email protected]>
    Cc: <[email protected]>
    Signed-off-by: Andrew Morton <[email protected]>

Signed-off-by: Rafael Aquini <[email protected]>

Author: Rafael Aquini

mm/debug.c

@@ -114,19 +114,22 @@ static void __dump_page(const struct page *page)
 {
 	struct folio *foliop, folio;
 	struct page precise;
+	unsigned long head;
 	unsigned long pfn = page_to_pfn(page);
 	unsigned long idx, nr_pages = 1;
 	int loops = 5;
 
 again:
 	memcpy(&precise, page, sizeof(*page));
-	foliop = page_folio(&precise);
-	if (foliop == (struct folio *)&precise) {
+	head = precise.compound_head;
+	if ((head & 1) == 0) {
+		foliop = (struct folio *)&precise;
 		idx = 0;
 		if (!folio_test_large(foliop))
 			goto dump;
 		foliop = (struct folio *)page;
 	} else {
+		foliop = (struct folio *)(head - 1);
 		idx = folio_page_idx(foliop, page);
 	}