[Crash-utility] [PATCH] arm64: incorrect translation, physical address include flags
Hi
We have seen a problem when translating virtual to physical
addresses. It appears that upper flags are not cleared.
Example below, observe that physical address is incorrect for 'PAGE:',
it include flags in upper bits. This value is also returned from
arm64_vtop_3level_4k().
crash> vtop ffffffc081000000
VIRTUAL PHYSICAL
ffffffc081000000 81000000
PAGE DIRECTORY: ffffffc00007d000
PGD: ffffffc00007d810 => 61fe003
PMD: ffffffc0061fe040 => 20000081000711
PAGE: 20000081000000 (2MB)
PTE PHYSICAL FLAGS
20000081000711 81000000 (VALID|SHARED|AF|PXN)
vtop: WARNING: sparsemem: invalid section number: 8388610
---
arm64.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/arm64.c b/arm64.c
index d1d75c4..2320df9 100644
--- a/arm64.c
+++ b/arm64.c
@@ -802,6 +802,7 @@ arm64_vtop_3level_4k(ulong pgd, ulong vaddr, physaddr_t *paddr, int
verbose)
if ((pmd_val & PMD_TYPE_MASK) == PMD_TYPE_SECT) {
ulong sectionbase = pmd_val & SECTION_PAGE_MASK_2MB;
+ sectionbase &= PHYS_MASK;
if (verbose) {
fprintf(fp, " PAGE: %lx (2MB)\n\n", sectionbase);
arm64_translate_pte(pmd_val, 0, 0);
--
1.9.1