From patchwork Tue Sep 3 15:06:33 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthias Maennich X-Patchwork-Id: 11128159 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 20DBF14F7 for ; Tue, 3 Sep 2019 15:07:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id ECF01215EA for ; Tue, 3 Sep 2019 15:07:47 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="ldoyE70k" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729874AbfICPHp (ORCPT ); Tue, 3 Sep 2019 11:07:45 -0400 Received: from mail-qt1-f202.google.com ([209.85.160.202]:42096 "EHLO mail-qt1-f202.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729872AbfICPHp (ORCPT ); Tue, 3 Sep 2019 11:07:45 -0400 Received: by mail-qt1-f202.google.com with SMTP id e22so19295394qtp.9 for ; Tue, 03 Sep 2019 08:07:44 -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=RSyx3V/T3+Fb/fBnjK85DcZdNsViLHAQqUGk4FWkZsU=; b=ldoyE70kJF8tGNXA/RdsmM9WccjJ/l/oyRh7hHi08RWg0nZ0Rb9g+gDqK01q50s4LE kEVDyCivDnMhp2TLCfzMZYj7EbsAcC1SKLhl1eECH6O6bIxSkf2tkH8PeVaISi8BMrjQ bFXkoedgoNYakwEgLdUh8j5FZZjsKdK6CtIOvdnLDO3LaQhp7wzRMV3TRywQgOkYCBOv 2akNhCRlY8j1azQOET4yeA7EmwQcMc0+z3BB0hSY3z7eYrDCORt+rTpAmU8VUCpl7APr R6ehlcXY7D66jWN4vC0T8gA6QaXzDZCb1IaCgj/asymbAZciAkWxF0iDkOohDTp8DXxs BeSA== 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=RSyx3V/T3+Fb/fBnjK85DcZdNsViLHAQqUGk4FWkZsU=; b=NntRDDgkS5QnTxlxCiSmVliukrG3ohbkeMyVALC6jAo1UYpR8Tlt50pCCuRgMVQ/4/ yojPWaOLdmjp4c0cEPIchZ8vpFFCJLDBj/RKKkOwapbaTWIZpXKHVetyjc0YhvGTXe4M ekCHcOC1Lpc1RwSvuhICLuEImm5vHQQTHLICXoHJ4kfkaiijwXqkbmQQglkhUUa3dCTi +iCSsy+DxqwtD7fhXzB9bNe9O60+78BiWBaZMBmy+aRuQG6w09U3dZisTYKC99+unZuF gydoklyK0eXSs1V+yBwRVxdxPplfKxV2+AysX8iteZMt8hCUn5fAi+gKE2pYk6veaXQA WI9g== X-Gm-Message-State: APjAAAWG9C0ciw9cSA+89Vtl24RGc/pI7Bh/xHocWKUrGht0sQYYddS3 ZzVYunK/qp/FaCwLjlUsIwrnbMg3ApysTA== X-Google-Smtp-Source: APXvYqzWnbTLWyx6Y6Af5dccbNi55xGD4hNXquBtED1N8JNA/6qhN3gWGV+qHmrza6FyvvdYJCf4Aj27tPX94g== X-Received: by 2002:aed:3c52:: with SMTP id u18mr15781866qte.194.1567523264136; Tue, 03 Sep 2019 08:07:44 -0700 (PDT) Date: Tue, 3 Sep 2019 16:06:33 +0100 In-Reply-To: <20190903150638.242049-1-maennich@google.com> Message-Id: <20190903150638.242049-8-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 07/12] modpost: add support for generating namespace dependencies 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: linux-kbuild-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org This patch adds an option to modpost to generate a .ns_deps file per module, containing the namespace dependencies for that module. E.g. if the linked module my-module.ko would depend on the symbol myfunc.MY_NS in the namespace MY_NS, the my-module.ns_deps file created by modpost would contain the entry MY_NS to express the namespace dependency of my-module imposed by using the symbol myfunc. These files can subsequently be used by static analysis tools (like coccinelle scripts) to address issues with missing namespace imports. A later patch of this series will introduce such a script 'nsdeps' and a corresponding make target to automatically add missing MODULE_IMPORT_NS() definitions to the module's sources. For that it uses the information provided in the generated .ns_deps files. Co-developed-by: Martijn Coenen Signed-off-by: Martijn Coenen Reviewed-by: Greg Kroah-Hartman Signed-off-by: Matthias Maennich --- .gitignore | 1 + Makefile | 2 +- scripts/mod/modpost.c | 54 +++++++++++++++++++++++++++++++++++++++---- scripts/mod/modpost.h | 2 ++ 4 files changed, 53 insertions(+), 6 deletions(-) diff --git a/.gitignore b/.gitignore index 2030c7a4d2f8..9ee63aa2a3fb 100644 --- a/.gitignore +++ b/.gitignore @@ -32,6 +32,7 @@ *.lzo *.mod *.mod.c +*.ns_deps *.o *.o.* *.order diff --git a/Makefile b/Makefile index 0cbe8717bdb3..0cdb957ae2c3 100644 --- a/Makefile +++ b/Makefile @@ -1669,7 +1669,7 @@ clean: $(clean-dirs) -o -name '*.ko.*' \ -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ -o -name '*.dwo' -o -name '*.lst' \ - -o -name '*.su' -o -name '*.mod' \ + -o -name '*.su' -o -name '*.mod' -o -name '*.ns_deps' \ -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ -o -name '*.lex.c' -o -name '*.tab.[ch]' \ -o -name '*.asn1.[ch]' \ diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c index c2d49afaea1c..be72da25fe7c 100644 --- a/scripts/mod/modpost.c +++ b/scripts/mod/modpost.c @@ -38,6 +38,8 @@ static int sec_mismatch_count = 0; static int sec_mismatch_fatal = 0; /* ignore missing files */ static int ignore_missing_files; +/* write namespace dependencies */ +static int write_namespace_deps; enum export { export_plain, export_unused, export_gpl, @@ -2176,10 +2178,15 @@ static int check_exports(struct module *mod) else basename = mod->name; - if (exp->namespace && - !module_imports_namespace(mod, exp->namespace)) { - warn("module %s uses symbol %s from namespace %s, but does not import it.\n", - basename, exp->name, exp->namespace); + if (exp->namespace) { + add_namespace(&mod->required_namespaces, + exp->namespace); + + if (!write_namespace_deps && + !module_imports_namespace(mod, exp->namespace)) { + warn("module %s uses symbol %s from namespace %s, but does not import it.\n", + basename, exp->name, exp->namespace); + } } if (!mod->gpl_compatible) @@ -2484,6 +2491,31 @@ static void write_dump(const char *fname) free(buf.p); } +static void write_namespace_deps_files(void) +{ + struct module *mod; + struct namespace_list *ns; + struct buffer ns_deps_buf = {}; + + for (mod = modules; mod; mod = mod->next) { + char fname[PATH_MAX]; + + if (mod->skip) + continue; + + ns_deps_buf.pos = 0; + + for (ns = mod->required_namespaces; ns; ns = ns->next) + buf_printf(&ns_deps_buf, "%s\n", ns->namespace); + + if (ns_deps_buf.pos == 0) + continue; + + sprintf(fname, "%s.ns_deps", mod->name); + write_if_changed(&ns_deps_buf, fname); + } +} + struct ext_sym_list { struct ext_sym_list *next; const char *file; @@ -2500,7 +2532,7 @@ int main(int argc, char **argv) struct ext_sym_list *extsym_iter; struct ext_sym_list *extsym_start = NULL; - while ((opt = getopt(argc, argv, "i:I:e:mnsT:o:awE")) != -1) { + while ((opt = getopt(argc, argv, "i:I:e:mnsT:o:awEd")) != -1) { switch (opt) { case 'i': kernel_read = optarg; @@ -2541,6 +2573,9 @@ int main(int argc, char **argv) case 'E': sec_mismatch_fatal = 1; break; + case 'd': + write_namespace_deps = 1; + break; default: exit(1); } @@ -2575,6 +2610,9 @@ int main(int argc, char **argv) err |= check_modname_len(mod); err |= check_exports(mod); + if (write_namespace_deps) + continue; + add_header(&buf, mod); add_intree_flag(&buf, !external_module); add_retpoline(&buf); @@ -2587,6 +2625,12 @@ int main(int argc, char **argv) sprintf(fname, "%s.mod.c", mod->name); write_if_changed(&buf, fname); } + + if (write_namespace_deps) { + write_namespace_deps_files(); + return 0; + } + if (dump_write) write_dump(dump_write); if (sec_mismatch_count && sec_mismatch_fatal) diff --git a/scripts/mod/modpost.h b/scripts/mod/modpost.h index 9626bf3e7424..92a926d375d2 100644 --- a/scripts/mod/modpost.h +++ b/scripts/mod/modpost.h @@ -126,6 +126,8 @@ struct module { struct buffer dev_table_buf; char srcversion[25]; int is_dot_o; + // Required namespace dependencies + struct namespace_list *required_namespaces; // Actual imported namespaces struct namespace_list *imported_namespaces; };