From patchwork Wed Nov 18 22:07:24 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sami Tolvanen X-Patchwork-Id: 11916037 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-26.2 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT,USER_IN_DEF_DKIM_WL autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id F1B71C5519F for ; Wed, 18 Nov 2020 22:09:32 +0000 (UTC) Received: from mother.openwall.net (mother.openwall.net [195.42.179.200]) by mail.kernel.org (Postfix) with SMTP id E0E80246CB for ; Wed, 18 Nov 2020 22:09:31 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="dbW3OmpX" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E0E80246CB Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kernel-hardening-return-20416-kernel-hardening=archiver.kernel.org@lists.openwall.com Received: (qmail 5341 invoked by uid 550); 18 Nov 2020 22:08:07 -0000 Mailing-List: contact kernel-hardening-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-ID: Received: (qmail 5219 invoked from network); 18 Nov 2020 22:08:07 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=sender:date:in-reply-to:message-id:mime-version:references:subject :from:to:cc; bh=viQfWSBnWWQkhdsfshg6wjQjXkrLrUdatQTDtGtOjLo=; b=dbW3OmpXPLinNMGxA3qqhmIvkxGOzMc7C/RLfKw2PW/qdCHjGaq5Rs1hCGsIzYh/jX cUO3w+ryPubJXJGol/AuBCcRFfqimlfssxX4y6J+iwik+/cszhw9jew2aOb9Lmdvu7q3 qieIDuh+CLwus3Se4ineY0Vi/kyTjXVxXyZ5lorAi2Hmy7HlCWwt7n7Fopjj6RXhZLX7 kv5Z35uHWmDhqECCVyNr9OPFyUHAODR3hYTPnvLnPLJZNbu1ZVXJIfgazGluz4pgyU8J qMfDZ+fkDzZG6An4ZATuVPNoDZGPBmol5zRBPXVr5pn1bl81Wq0RE3gdh/WU/xznOT8P KR2w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=viQfWSBnWWQkhdsfshg6wjQjXkrLrUdatQTDtGtOjLo=; b=WOLZSzWXi/c5nTZ689CXf+rWJMTIC81c+V7ABVU9hkfGJb6szgNWWmgatjBopO89UV yqUbDH7tGorybbOkGRQksDy4DtftHciaUccc+nv6+tu1D4cttXJy8ORdyHlJi+kUtJgO rYt1aU/v9J2el96y0StRT7uHV2NUllc0imVv+JkBZYR3u3dWm2sj2gUj1eZSAZ7wzSV9 yjImX3Cqkp10Xdr/Ixlr3KmtCdcBZfMAbrXzIjt2LvSZ7g5hBB6R0GXojfMUCIZvYlrs ce40jMHT/bovW9/HkP8WyHdBetfniapIp6YF6mIqjBu7nT+cb3KYUTPrv/ef7bWiRDQt 6fVQ== X-Gm-Message-State: AOAM5334bNbKG8/z4/b1jYilsc/MoSFlwE9tU/4NbXAkBNOZDd1mTmNa /6uxdyNg57jHQ9OhZM6qxofJI3T8iH0Del2MHuU= X-Google-Smtp-Source: ABdhPJzhC6bbGfgKTOT/DdbCJcRfllDjQ4hY6LJihFMdwChNr7SRK4RBgObFPHKV0TZJgGDSTsKPIHTsuMaflYXpbFA= Sender: "samitolvanen via sendgmr" X-Received: from samitolvanen1.mtv.corp.google.com ([2620:15c:201:2:f693:9fff:fef4:1b6d]) (user=samitolvanen job=sendgmr) by 2002:a25:9248:: with SMTP id e8mr12067724ybo.223.1605737275399; Wed, 18 Nov 2020 14:07:55 -0800 (PST) Date: Wed, 18 Nov 2020 14:07:24 -0800 In-Reply-To: <20201118220731.925424-1-samitolvanen@google.com> Message-Id: <20201118220731.925424-11-samitolvanen@google.com> Mime-Version: 1.0 References: <20201118220731.925424-1-samitolvanen@google.com> X-Mailer: git-send-email 2.29.2.454.gaff20da3a2-goog Subject: [PATCH v7 10/17] modpost: lto: strip .lto from module names From: Sami Tolvanen To: Masahiro Yamada , Steven Rostedt , Will Deacon Cc: Josh Poimboeuf , Peter Zijlstra , Greg Kroah-Hartman , "Paul E. McKenney" , Kees Cook , Nick Desaulniers , clang-built-linux@googlegroups.com, kernel-hardening@lists.openwall.com, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, Sami Tolvanen With LTO, everything is compiled into LLVM bitcode, so we have to link each module into native code before modpost. Kbuild uses the .lto.o suffix for these files, which also ends up in module information. This change strips the unnecessary .lto suffix from the module name. Suggested-by: Bill Wendling Signed-off-by: Sami Tolvanen Reviewed-by: Kees Cook --- scripts/mod/modpost.c | 16 +++++++--------- scripts/mod/modpost.h | 9 +++++++++ scripts/mod/sumversion.c | 6 +++++- 3 files changed, 21 insertions(+), 10 deletions(-) diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c index f882ce0d9327..ebb15cc3f262 100644 --- a/scripts/mod/modpost.c +++ b/scripts/mod/modpost.c @@ -17,7 +17,6 @@ #include #include #include -#include #include #include "modpost.h" #include "../../include/linux/license.h" @@ -80,14 +79,6 @@ modpost_log(enum loglevel loglevel, const char *fmt, ...) exit(1); } -static inline bool strends(const char *str, const char *postfix) -{ - if (strlen(str) < strlen(postfix)) - return false; - - return strcmp(str + strlen(str) - strlen(postfix), postfix) == 0; -} - void *do_nofail(void *ptr, const char *expr) { if (!ptr) @@ -1984,6 +1975,10 @@ static char *remove_dot(char *s) size_t m = strspn(s + n + 1, "0123456789"); if (m && (s[n + m] == '.' || s[n + m] == 0)) s[n] = 0; + + /* strip trailing .lto */ + if (strends(s, ".lto")) + s[strlen(s) - 4] = '\0'; } return s; } @@ -2007,6 +2002,9 @@ static void read_symbols(const char *modname) /* strip trailing .o */ tmp = NOFAIL(strdup(modname)); tmp[strlen(tmp) - 2] = '\0'; + /* strip trailing .lto */ + if (strends(tmp, ".lto")) + tmp[strlen(tmp) - 4] = '\0'; mod = new_module(tmp); free(tmp); } diff --git a/scripts/mod/modpost.h b/scripts/mod/modpost.h index 3aa052722233..fab30d201f9e 100644 --- a/scripts/mod/modpost.h +++ b/scripts/mod/modpost.h @@ -2,6 +2,7 @@ #include #include #include +#include #include #include #include @@ -180,6 +181,14 @@ static inline unsigned int get_secindex(const struct elf_info *info, return info->symtab_shndx_start[sym - info->symtab_start]; } +static inline bool strends(const char *str, const char *postfix) +{ + if (strlen(str) < strlen(postfix)) + return false; + + return strcmp(str + strlen(str) - strlen(postfix), postfix) == 0; +} + /* file2alias.c */ extern unsigned int cross_build; void handle_moddevtable(struct module *mod, struct elf_info *info, diff --git a/scripts/mod/sumversion.c b/scripts/mod/sumversion.c index d587f40f1117..760e6baa7eda 100644 --- a/scripts/mod/sumversion.c +++ b/scripts/mod/sumversion.c @@ -391,10 +391,14 @@ void get_src_version(const char *modname, char sum[], unsigned sumlen) struct md4_ctx md; char *fname; char filelist[PATH_MAX + 1]; + int postfix_len = 1; + + if (strends(modname, ".lto.o")) + postfix_len = 5; /* objects for a module are listed in the first line of *.mod file. */ snprintf(filelist, sizeof(filelist), "%.*smod", - (int)strlen(modname) - 1, modname); + (int)strlen(modname) - postfix_len, modname); buf = read_text_file(filelist);