From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pb0-f48.google.com (mail-pb0-f48.google.com [209.85.160.48]) by kanga.kvack.org (Postfix) with ESMTP id D6D4A6B0037 for ; Wed, 2 Oct 2013 10:29:00 -0400 (EDT) Received: by mail-pb0-f48.google.com with SMTP id ma3so949850pbc.35 for ; Wed, 02 Oct 2013 07:29:00 -0700 (PDT) From: Jan Kara Subject: [PATCH 02/26] ia64: Use get_user_pages_fast() in err_inject.c Date: Wed, 2 Oct 2013 16:27:43 +0200 Message-Id: <1380724087-13927-3-git-send-email-jack@suse.cz> In-Reply-To: <1380724087-13927-1-git-send-email-jack@suse.cz> References: <1380724087-13927-1-git-send-email-jack@suse.cz> Sender: owner-linux-mm@kvack.org List-ID: To: LKML Cc: linux-mm@kvack.org, Jan Kara , Tony Luck , linux-ia64@vger.kernel.org Convert get_user_pages() call to get_user_pages_fast(). This actually fixes an apparent bug where get_user_pages() has been called without mmap_sem for an arbitrary user-provided address. CC: Tony Luck CC: linux-ia64@vger.kernel.org Signed-off-by: Jan Kara --- arch/ia64/kernel/err_inject.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/arch/ia64/kernel/err_inject.c b/arch/ia64/kernel/err_inject.c index f59c0b844e88..75d35906a86b 100644 --- a/arch/ia64/kernel/err_inject.c +++ b/arch/ia64/kernel/err_inject.c @@ -142,8 +142,7 @@ store_virtual_to_phys(struct device *dev, struct device_attribute *attr, u64 virt_addr=simple_strtoull(buf, NULL, 16); int ret; - ret = get_user_pages(current, current->mm, virt_addr, - 1, VM_READ, 0, NULL, NULL); + ret = get_user_pages_fast(virt_addr, 1, VM_READ, NULL); if (ret<=0) { #ifdef ERR_INJ_DEBUG printk("Virtual address %lx is not existing.\n",virt_addr); -- 1.8.1.4 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org