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
| ||
|
Date: Fri, 27 Jul 2012 18:32:55 +0800 From: Wen Congyang <wency@...fujitsu.com> To: linux-mm@...ck.org, linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org, linux-acpi@...r.kernel.org, linux-s390@...r.kernel.org, linux-sh@...r.kernel.org, linux-ia64@...r.kernel.org, cmetcalf@...era.com CC: rientjes@...gle.com, liuj97@...il.com, len.brown@...el.com, benh@...nel.crashing.org, paulus@...ba.org, cl@...ux.com, minchan.kim@...il.com, akpm@...ux-foundation.org, kosaki.motohiro@...fujitsu.com, Yasuaki ISIMATU <isimatu.yasuaki@...fujitsu.com> Subject: [RFC PATCH v5 13/19] memory-hotplug: check page type in get_page_bootmem From: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com> There is a possibility that get_page_bootmem() is called to the same page many times. So when get_page_bootmem is called to the same page, the function only increments page->_count. CC: David Rientjes <rientjes@...gle.com> CC: Jiang Liu <liuj97@...il.com> CC: Len Brown <len.brown@...el.com> CC: Benjamin Herrenschmidt <benh@...nel.crashing.org> CC: Paul Mackerras <paulus@...ba.org> CC: Christoph Lameter <cl@...ux.com> Cc: Minchan Kim <minchan.kim@...il.com> CC: Andrew Morton <akpm@...ux-foundation.org> CC: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> CC: Wen Congyang <wency@...fujitsu.com> Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com> --- mm/memory_hotplug.c | 15 +++++++++++---- 1 files changed, 11 insertions(+), 4 deletions(-) diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 0c932e1..eae946b 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -95,10 +95,17 @@ static void release_memory_resource(struct resource *res) static void get_page_bootmem(unsigned long info, struct page *page, unsigned long type) { - page->lru.next = (struct list_head *) type; - SetPagePrivate(page); - set_page_private(page, info); - atomic_inc(&page->_count); + unsigned long page_type; + + page_type = (unsigned long) page->lru.next; + if (type < MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE || + type > MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE){ + page->lru.next = (struct list_head *) type; + SetPagePrivate(page); + set_page_private(page, info); + atomic_inc(&page->_count); + } else + atomic_inc(&page->_count); } /* reference to __meminit __free_pages_bootmem is valid -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists