From 2c9eb7028c0714c3379b58a59c60f7b5b7a5adb0 Mon Sep 17 00:00:00 2001 From: Josh Poimboeuf Date: Tue, 3 Oct 2017 20:10:36 -0500 Subject: [PATCH 037/242] objtool: Upgrade libelf-devel warning to error for CONFIG_ORC_UNWINDER MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit CVE-2017-5754 With CONFIG_ORC_UNWINDER, if the user doesn't have libelf-devel installed, and they don't see the make warning, their ORC unwinder will be silently broken. Upgrade the warning to an error. Reported-and-tested-by: Borislav Petkov Signed-off-by: Josh Poimboeuf Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Link: http://lkml.kernel.org/r/d9dfc39fb8240998820f9efb233d283a1ee96084.1507079417.git.jpoimboe@redhat.com Signed-off-by: Ingo Molnar (cherry picked from commit 3dd40cb320fee7c23b574ab821ce140ccd1281c9) Signed-off-by: Andy Whitcroft Signed-off-by: Kleber Sacilotto de Souza (cherry picked from commit c413466a72ca533ec126ebc0c5bb579ae0c96b1d) Signed-off-by: Fabian Grünbichler --- Makefile | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/Makefile b/Makefile index 8e14a926fc94..490ce18685ea 100644 --- a/Makefile +++ b/Makefile @@ -965,7 +965,11 @@ ifdef CONFIG_STACK_VALIDATION ifeq ($(has_libelf),1) objtool_target := tools/objtool FORCE else - $(warning "Cannot use CONFIG_STACK_VALIDATION, please install libelf-dev, libelf-devel or elfutils-libelf-devel") + ifdef CONFIG_ORC_UNWINDER + $(error "Cannot generate ORC metadata for CONFIG_ORC_UNWINDER=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") + else + $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel") + endif SKIP_STACK_VALIDATION := 1 export SKIP_STACK_VALIDATION endif -- 2.14.2