linux-kernel - [PATCH 09/13] mm: don't abuse pte_index() in hmm_vma_handle

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20190730055203.28467-10-hch@lst.de>
Date:   Tue, 30 Jul 2019 08:51:59 +0300
From:   Christoph Hellwig <hch@....de>
To:     Jérôme Glisse <jglisse@...hat.com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Ben Skeggs <bskeggs@...hat.com>,
        Felix Kuehling <Felix.Kuehling@....com>
Cc:     Ralph Campbell <rcampbell@...dia.com>, linux-mm@...ck.org,
        nouveau@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        amd-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH 09/13] mm: don't abuse pte_index() in hmm_vma_handle_pmd

pte_index is an internal arch helper in various architectures,
without consistent semantics.  Open code that calculation of a PMD
index based on the virtual address instead.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 mm/hmm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/hmm.c b/mm/hmm.c
index 88b77a4a6a1e..e63ab7f11334 100644
--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -486,7 +486,7 @@ static int hmm_vma_handle_pmd(struct mm_walk *walk,
 	if (pmd_protnone(pmd) || fault || write_fault)
 		return hmm_vma_walk_hole_(addr, end, fault, write_fault, walk);
 
-	pfn = pmd_pfn(pmd) + pte_index(addr);
+	pfn = pmd_pfn(pmd) + ((addr & ~PMD_MASK) >> PAGE_SHIFT);
 	for (i = 0; addr < end; addr += PAGE_SIZE, i++, pfn++) {
 		if (pmd_devmap(pmd)) {
 			pgmap = get_dev_pagemap(pfn, pgmap);
-- 
2.20.1