From patchwork Fri Jan 24 06:25:16 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vasily Averin X-Patchwork-Id: 11349795 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 92F7D14B4 for ; Fri, 24 Jan 2020 06:25:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 782A82071A for ; Fri, 24 Jan 2020 06:25:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727493AbgAXGZs (ORCPT ); Fri, 24 Jan 2020 01:25:48 -0500 Received: from relay.sw.ru ([185.231.240.75]:52000 "EHLO relay.sw.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726173AbgAXGZs (ORCPT ); Fri, 24 Jan 2020 01:25:48 -0500 Received: from vvs-ws.sw.ru ([172.16.24.21]) by relay.sw.ru with esmtp (Exim 4.92.3) (envelope-from ) id 1iusP7-0007u1-9B; Fri, 24 Jan 2020 09:25:17 +0300 From: Vasily Averin Subject: [PATCH 1/1] proc_keys_next should increase position index To: keyrings@vger.kernel.org, linux-security-module@vger.kernel.org Cc: David Howells , Jarkko Sakkinen , James Morris , "Serge E. Hallyn" Message-ID: Date: Fri, 24 Jan 2020 09:25:16 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.2.2 MIME-Version: 1.0 Content-Language: en-US Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: if seq_file .next fuction does not change position index, read after some lseek can generate unexpected output. https://bugzilla.kernel.org/show_bug.cgi?id=206283 Signed-off-by: Vasily Averin --- security/keys/proc.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/security/keys/proc.c b/security/keys/proc.c index 415f3f1..d0cde66 100644 --- a/security/keys/proc.c +++ b/security/keys/proc.c @@ -139,6 +139,8 @@ static void *proc_keys_next(struct seq_file *p, void *v, loff_t *_pos) n = key_serial_next(p, v); if (n) *_pos = key_node_serial(n); + else + (*_pos)++; return n; }