From patchwork Tue Sep 3 15:06:27 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?q?Matthias_M=C3=A4nnich?= X-Patchwork-Id: 11128237 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 7A018112C for ; Tue, 3 Sep 2019 15:08:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 56B91215EA for ; Tue, 3 Sep 2019 15:08:28 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="BYUxI3Mr" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729690AbfICPH2 (ORCPT ); Tue, 3 Sep 2019 11:07:28 -0400 Received: from mail-vk1-f202.google.com ([209.85.221.202]:49875 "EHLO mail-vk1-f202.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729083AbfICPH1 (ORCPT ); Tue, 3 Sep 2019 11:07:27 -0400 Received: by mail-vk1-f202.google.com with SMTP id j8so4138971vkn.16 for ; Tue, 03 Sep 2019 08:07:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=XfkuPAzUg0cWTsSII8UxfvUGODgh66Dt0PdffmfP8ds=; b=BYUxI3MrD4U+BDkDqOah6HY4Bw3pPfx8gK6OvtG3TXQTUxrmLgeaUM0pE8m3+shX6r a/m7v+yD6KHnNo+2ozvu18HPRGjOHvfslAqkS5IswlmTxW49zalq4r2NEg5CdB8oQkZJ pAapdfiGvhDtqiSUAMffWLVrPJkbibNXNTmF7aR7IOEMKWP7svSLCs82N06Qiv1VX1m/ 5vbEakyc4zD9nCo5vutlPMx63M7oy2fEEfWiVlMm+JhP/hBcAkGEKvPBGRSCkvuGoziM 55t1VRH8ly44VKnD8mGx4rlnGVDfwwQI67M2aRWLr9QioEbqXOZ2lppuU09AhqkaX4S+ GWeg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=XfkuPAzUg0cWTsSII8UxfvUGODgh66Dt0PdffmfP8ds=; b=p2u5ldBzDJjTeUZpjzwSV3Z+QbW/v+fQElij5t+awYKbA7KVm+R9q/pWI2FRwjEWSP EggtiWkdp91QHg9AGpCw3VWxwzFBtFhtk5UObStvgp2qZAqXjv/CDv2xKNLuGRZ3sY5b Y5FtwbA57Deim907psP0F7/vjRv9DTJ/jpqqUFP0lDLaEFvz1MMj+bF1ADGPph1u0g/j 4dfpSClTwxjwkm38munIS+YosxvKrjonxqL/1hMvFirrIPUbK+Ff7y4K3+KCp8jiLCVl WAdiAThm46DOrGijYE/upEorREkcFvjAQK4U8/eA3Io5GJw84gDMc2IWpahM2i4CwqrA 58vQ== X-Gm-Message-State: APjAAAVqU1dfuNcfCcXs1tf1Uo4vmR3BZRIFnd+YR6FYmuNjh2JAWRX9 do+h1F4FPgiwzfb5HqHzyA/pSNSca6WQLg== X-Google-Smtp-Source: APXvYqwpDXpoU/tekMTm7cq8cLvZxAh2XQiVvLYuHJwsk/oxVDEJdK9XflLHkcImHQpKAl2LR/xVFUqqHgFc+A== X-Received: by 2002:a67:fb90:: with SMTP id n16mr19342370vsr.7.1567523246431; Tue, 03 Sep 2019 08:07:26 -0700 (PDT) Date: Tue, 3 Sep 2019 16:06:27 +0100 In-Reply-To: <20190903150638.242049-1-maennich@google.com> Message-Id: <20190903150638.242049-2-maennich@google.com> Mime-Version: 1.0 References: <20180716122125.175792-1-maco@android.com> <20190903150638.242049-1-maennich@google.com> X-Mailer: git-send-email 2.23.0.187.g17f5b7556c-goog Subject: [PATCH v4 01/12] module: support reading multiple values per modinfo tag From: Matthias Maennich To: linux-kernel@vger.kernel.org Cc: kernel-team@android.com, maennich@google.com, arnd@arndb.de, gregkh@linuxfoundation.org, jeyu@kernel.org, joel@joelfernandes.org, lucas.de.marchi@gmail.com, maco@android.com, sspatil@google.com, will@kernel.org, yamada.masahiro@socionext.com, linux-kbuild@vger.kernel.org, linux-modules@vger.kernel.org, linux-usb@vger.kernel.org, usb-storage@lists.one-eyed-alien.net, linux-watchdog@vger.kernel.org Sender: owner-linux-modules@vger.kernel.org Precedence: bulk List-ID: Similar to modpost's get_next_modinfo(), introduce get_next_modinfo() in kernel/module.c to acquire any further values associated with the same modinfo tag name. That is useful for any tags that have multiple occurrences (such as 'alias'), but is in particular introduced here as part of the symbol namespaces patch series to read the (potentially) multiple namespaces a module is importing. Reviewed-by: Joel Fernandes (Google) Reviewed-by: Martijn Coenen Reviewed-by: Greg Kroah-Hartman Signed-off-by: Matthias Maennich --- kernel/module.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-) diff --git a/kernel/module.c b/kernel/module.c index 9ee93421269c..3ee507c0a92f 100644 --- a/kernel/module.c +++ b/kernel/module.c @@ -2481,7 +2481,8 @@ static char *next_string(char *string, unsigned long *secsize) return string; } -static char *get_modinfo(struct load_info *info, const char *tag) +static char *get_next_modinfo(const struct load_info *info, const char *tag, + char *prev) { char *p; unsigned int taglen = strlen(tag); @@ -2492,13 +2493,25 @@ static char *get_modinfo(struct load_info *info, const char *tag) * get_modinfo() calls made before rewrite_section_headers() * must use sh_offset, as sh_addr isn't set! */ - for (p = (char *)info->hdr + infosec->sh_offset; p; p = next_string(p, &size)) { + char *modinfo = (char *)info->hdr + infosec->sh_offset; + + if (prev) { + size -= prev - modinfo; + modinfo = next_string(prev, &size); + } + + for (p = modinfo; p; p = next_string(p, &size)) { if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') return p + taglen + 1; } return NULL; } +static char *get_modinfo(const struct load_info *info, const char *tag) +{ + return get_next_modinfo(info, tag, NULL); +} + static void setup_modinfo(struct module *mod, struct load_info *info) { struct module_attribute *attr;