linux-kernel - [PATCH] mm: check high-order page when free it to pcp

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-next>] [day] [month] [year] [list]

Date:   Mon, 19 Sep 2022 11:47:18 +0800
From:   "zhaoyang.huang" <zhaoyang.huang@...soc.com>
To:     Mel Gorman <mgorman@...hsingularity.net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Zhaoyang Huang <huangzhaoyang@...il.com>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>, <ke.wang@...soc.com>
Subject: [PATCH] mm: check high-order page when free it to pcp

From: Zhaoyang Huang <zhaoyang.huang@...soc.com>

High-order pcp page escaped from checking when both of DEBUG_VM and debug_pagealloc
are all disabled if it allocated again from pcp_list without going to global
free list, which should be introduced by 44042b4498.

fix:44042b4498

Signed-off-by: Zhaoyang Huang <zhaoyang.huang@...soc.com>
---
 mm/page_alloc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index e008a3d..e77f3a7 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1437,7 +1437,7 @@ static bool bulkfree_pcp_prepare(struct page *page)
  */
 static bool free_pcp_prepare(struct page *page, unsigned int order)
 {
-	if (debug_pagealloc_enabled_static())
+	if (debug_pagealloc_enabled_static() || order)
 		return free_pages_prepare(page, order, true, FPI_NONE);
 	else
 		return free_pages_prepare(page, order, false, FPI_NONE);
-- 
1.9.1