From patchwork Thu May 9 14:38:54 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joe Lawrence X-Patchwork-Id: 10937253 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B331A92A for ; Thu, 9 May 2019 14:39:47 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A34AB1FF30 for ; Thu, 9 May 2019 14:39:47 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 976D628A19; Thu, 9 May 2019 14:39:47 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A71751FF30 for ; Thu, 9 May 2019 14:39:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726632AbfEIOjl (ORCPT ); Thu, 9 May 2019 10:39:41 -0400 Received: from mx1.redhat.com ([209.132.183.28]:59588 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726831AbfEIOjM (ORCPT ); Thu, 9 May 2019 10:39:12 -0400 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 3C68C3B718; Thu, 9 May 2019 14:39:12 +0000 (UTC) Received: from jlaw-desktop.redhat.com (ovpn-123-90.rdu2.redhat.com [10.10.123.90]) by smtp.corp.redhat.com (Postfix) with ESMTP id A612E5E7A6; Thu, 9 May 2019 14:39:11 +0000 (UTC) From: Joe Lawrence To: linux-kernel@vger.kernel.org, live-patching@vger.kernel.org, linux-kbuild@vger.kernel.org Subject: [PATCH v4 05/10] modpost: Integrate klp-convert Date: Thu, 9 May 2019 10:38:54 -0400 Message-Id: <20190509143859.9050-6-joe.lawrence@redhat.com> In-Reply-To: <20190509143859.9050-1-joe.lawrence@redhat.com> References: <20190509143859.9050-1-joe.lawrence@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.30]); Thu, 09 May 2019 14:39:12 +0000 (UTC) Sender: linux-kbuild-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Josh Poimboeuf Create cmd_klp_convert and hook it into scripts/Makefile.modpost. cmd_klp_convert invokes klp-convert with the right arguments for the conversion of unresolved symbols inside a livepatch. Signed-off-by: Josh Poimboeuf Signed-off-by: Konstantin Khlebnikov Signed-off-by: Miroslav Benes Signed-off-by: Joao Moreira Signed-off-by: Joe Lawrence --- scripts/Kbuild.include | 4 +++- scripts/Makefile.modpost | 16 +++++++++++++++- scripts/mod/modpost.c | 6 +++++- scripts/mod/modpost.h | 1 + 4 files changed, 24 insertions(+), 3 deletions(-) diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include index 7484b9d8272f..f8b7d12e44c9 100644 --- a/scripts/Kbuild.include +++ b/scripts/Kbuild.include @@ -236,6 +236,8 @@ endif # (needed for the shell) make-cmd = $(call escsq,$(subst $(pound),$$(pound),$(subst $$,$$$$,$(cmd_$(1))))) +save-cmd = printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd + # Find any prerequisites that is newer than target or that does not exist. # PHONY targets skipped in both cases. any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^) @@ -243,7 +245,7 @@ any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^) # Execute command if command has changed or prerequisite(s) are updated. if_changed = $(if $(strip $(any-prereq) $(arg-check)), \ $(cmd); \ - printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:) + $(save-cmd), @:) # Execute the command and also postprocess generated .d dependencies file. if_changed_dep = $(if $(strip $(any-prereq) $(arg-check)),$(cmd_and_fixdep),@:) diff --git a/scripts/Makefile.modpost b/scripts/Makefile.modpost index 6b7f354f189a..1bef611f99b6 100644 --- a/scripts/Makefile.modpost +++ b/scripts/Makefile.modpost @@ -124,8 +124,22 @@ quiet_cmd_ld_ko_o = LD [M] $@ -o $@ $(real-prereqs) ; \ $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) +SLIST = $(objtree)/Symbols.list +KLP_CONVERT = scripts/livepatch/klp-convert +quiet_cmd_klp_convert = KLP $@ + cmd_klp_convert = mv $@ $(@:.ko=.klp.o); \ + $(KLP_CONVERT) $(SLIST) $(@:.ko=.klp.o) $@ + +define rule_ld_ko_o + $(Q)$(call echo-cmd,ld_ko_o) $(cmd_ld_ko_o) ; \ + $(call save-cmd,ld_ko_o) ; \ + $(if $(CONFIG_LIVEPATCH), \ + $(if $(wildcard $(MODVERDIR)/$(basetarget).livepatch), \ + $(call echo-cmd,klp_convert) $(cmd_klp_convert) )) +endef + $(modules): %.ko :%.o %.mod.o FORCE - +$(call if_changed,ld_ko_o) + +$(call if_changed_rule,ld_ko_o) targets += $(modules) diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c index f277e116e0eb..374b22c76ec5 100644 --- a/scripts/mod/modpost.c +++ b/scripts/mod/modpost.c @@ -1974,6 +1974,10 @@ static void read_symbols(const char *modname) license = get_next_modinfo(&info, "license", license); } + /* Livepatch modules have unresolved symbols resolved by klp-convert */ + if (get_modinfo(&info, "livepatch")) + mod->livepatch = 1; + for (sym = info.symtab_start; sym < info.symtab_stop; sym++) { symname = remove_dot(info.strtab + sym->st_name); @@ -2101,7 +2105,7 @@ static int check_exports(struct module *mod) const char *basename; exp = find_symbol(s->name); if (!exp || exp->module == mod) { - if (have_vmlinux && !s->weak) { + if (have_vmlinux && !s->weak && !mod->livepatch) { if (warn_unresolved) { warn("\"%s\" [%s.ko] undefined!\n", s->name, mod->name); diff --git a/scripts/mod/modpost.h b/scripts/mod/modpost.h index 8453d6ac2f77..2acfaae064ec 100644 --- a/scripts/mod/modpost.h +++ b/scripts/mod/modpost.h @@ -118,6 +118,7 @@ struct module { int skip; int has_init; int has_cleanup; + int livepatch; struct buffer dev_table_buf; char srcversion[25]; int is_dot_o;