From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964844AbeBLOpY (ORCPT ); Mon, 12 Feb 2018 09:45:24 -0500 Received: from out30-130.freemail.mail.aliyun.com ([115.124.30.130]:43792 "EHLO out30-130.freemail.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S935941AbeBLOpQ (ORCPT ); Mon, 12 Feb 2018 09:45:16 -0500 X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R551e4;CH=green;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e01353;MF=zhang.jia@linux.alibaba.com;NM=1;PH=DS;RN=6;SR=0;TI=SMTPD_---0Sy3nJF7_1518446695; From: Jia Zhang To: tglx@linutronix.de, jolsa@redhat.com, mingo@redhat.com, hpa@zytor.com Cc: x86@kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 2/2] x86/mm/64: Add vsyscall page to /proc/kcore conditionally Date: Mon, 12 Feb 2018 22:44:54 +0800 Message-Id: <1518446694-21124-3-git-send-email-zhang.jia@linux.alibaba.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1518446694-21124-1-git-send-email-zhang.jia@linux.alibaba.com> References: <1518446694-21124-1-git-send-email-zhang.jia@linux.alibaba.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The vsyscall page should be visible only if vsyscall=emulate/native when dumping /proc/kcore. Signed-off-by: Jia Zhang Reviewed-by: Jiri Olsa --- arch/x86/mm/init_64.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c index 14cd7f8..cbd6ea4 100644 --- a/arch/x86/mm/init_64.c +++ b/arch/x86/mm/init_64.c @@ -1193,8 +1193,10 @@ void __init mem_init(void) register_page_bootmem_info(); /* Register memory areas for /proc/kcore */ - kclist_add(&kcore_vsyscall, (void *)VSYSCALL_ADDR, - PAGE_SIZE, KCORE_USER); + if (get_gate_vma(&init_mm)) { + kclist_add(&kcore_vsyscall, (void *)VSYSCALL_ADDR, + PAGE_SIZE, KCORE_USER); + } mem_init_print_info(NULL); } -- 1.8.3.1