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:   Mon, 23 Jan 2023 11:04:15 -0600
From:   George Prekas <george@...abrica.net>
To:     linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Hyeonggon Yoo <42.hyeyoo@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        "Liam R. Howlett" <Liam.Howlett@...cle.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Andrei Vagin <avagin@...il.com>,
        George Prekas <george@...abrica.net>
Subject: [PATCH 5/9] mm: kmemleak: do not scan sparsemap_buf

sparsemap_buf is used for vmemmap and vmemmap contains an array of
struct page. kmemleak scans the pages separately. If it scans them
twice, then it will duplicate the number of found references and will
cause missed leaks.

Signed-off-by: George Prekas <george@...abrica.net>
---
 mm/sparse.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mm/sparse.c b/mm/sparse.c
index 2779b419ef2a..49df7a052037 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -14,6 +14,7 @@
 #include <linux/swap.h>
 #include <linux/swapops.h>
 #include <linux/bootmem_info.h>
+#include <linux/kmemleak.h>
 
 #include "internal.h"
 #include <asm/dma.h>
@@ -466,6 +467,8 @@ static void __init sparse_buffer_init(unsigned long size, int nid)
 	 */
 	sparsemap_buf = memmap_alloc(size, section_map_size(), addr, nid, true);
 	sparsemap_buf_end = sparsemap_buf + size;
+	/* sparsemap_buf has been registered with its physical address in kmemleak */
+	kmemleak_no_scan_phys(virt_to_phys(sparsemap_buf));
 }
 
 static void __init sparse_buffer_fini(void)
-- 
2.37.1

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ