linux-kernel - [PATCH 2/3] mm/mempolicy: Avoid the fallthrough with MPOLD_BIND in mpol

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]

Date: Sat, 17 Feb 2024 01:31:34 -0600
From: Donet Tom <donettom@...ux.ibm.com>
To: Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Cc: Aneesh Kumar <aneesh.kumar@...nel.org>, Huang Ying <ying.huang@...el.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Mel Gorman <mgorman@...e.de>, Ben Widawsky <ben.widawsky@...el.com>,
        Feng Tang <feng.tang@...el.com>, Michal Hocko <mhocko@...nel.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
        Rik van Riel <riel@...riel.com>, Johannes Weiner <hannes@...xchg.org>,
        Matthew Wilcox <willy@...radead.org>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Dan Williams <dan.j.williams@...el.com>,
        Hugh Dickins <hughd@...gle.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Suren Baghdasaryan <surenb@...gle.com>
Subject: [PATCH 2/3] mm/mempolicy: Avoid the fallthrough with MPOLD_BIND in mpol_misplaced.

We will update MPOL_PREFERRED_MANY in the follow up patch. This change
is required for that.

Signed-off-by: Aneesh Kumar K.V (IBM) <aneesh.kumar@...nel.org>
Signed-off-by: Donet Tom <donettom@...ux.ibm.com>
---
 mm/mempolicy.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 8478574c000c..73d698e21dae 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -2515,7 +2515,15 @@ int mpol_misplaced(struct folio *folio, struct vm_area_struct *vma,
 				break;
 			goto out;
 		}
-		fallthrough;
+
+		if (node_isset(curnid, pol->nodes))
+			goto out;
+		z = first_zones_zonelist(
+				node_zonelist(thisnid, GFP_HIGHUSER),
+				gfp_zone(GFP_HIGHUSER),
+				&pol->nodes);
+		polnid = zone_to_nid(z->zone);
+		break;
 
 	case MPOL_PREFERRED_MANY:
 		/*
-- 
2.39.3