From patchwork Mon Dec 2 14:59:48 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Zijlstra X-Patchwork-Id: 13890940 Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 54426205AD0; Mon, 2 Dec 2024 15:11:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.92.199 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733152298; cv=none; b=knBedDh+GbC+zOCsq9ch7tX6iMqXj17SSeY41iIuMF8fBZuFR3+xaWaFCTTfgCqmL6kuxxTFH8OWf5RHQJ62Y4V4YgCadF/j5En2ETF1GoTl43oQIGXX8zJ+Tg9c2N5N+60eQvY3mr3FKNYDopCKGdIqXAtDXxdpELrLPFBnmis= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733152298; c=relaxed/simple; bh=ICOg1urReFlrbqKpNdpCrFXGtC8QcWkJbyQIfD2HIMs=; h=Message-ID:Date:From:To:Cc:Subject:References:MIME-Version: Content-Type; 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} - namespace = get_modinfo(&info, "import_ns"); - while (namespace) { + for (namespace = get_modinfo(&info, "import_ns"); namespace; + namespace = get_next_modinfo(&info, "import_ns", namespace)) add_namespace(&mod->imported_namespaces, namespace); - namespace = get_next_modinfo(&info, "import_ns", - namespace); - } if (extra_warn && !get_modinfo(&info, "description")) warn("missing MODULE_DESCRIPTION() in %s\n", modname); From patchwork Mon Dec 2 14:59:49 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Zijlstra X-Patchwork-Id: 13890937 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 55789207A3D; Mon, 2 Dec 2024 15:11:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal: i=1; 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Mon, 02 Dec 2024 15:11:28 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 0) id C64EC300729; Mon, 2 Dec 2024 16:11:27 +0100 (CET) Message-ID: <20241202150810.270511329@infradead.org> User-Agent: quilt/0.66 Date: Mon, 02 Dec 2024 15:59:49 +0100 From: Peter Zijlstra To: mcgrof@kernel.org Cc: x86@kernel.org, hpa@zytor.com, petr.pavlu@suse.com, samitolvanen@google.com, da.gomez@samsung.com, masahiroy@kernel.org, nathan@kernel.org, nicolas@fjasle.eu, linux-kernel@vger.kernel.org, linux-modules@vger.kernel.org, linux-kbuild@vger.kernel.org, hch@infradead.org, gregkh@linuxfoundation.org, "Peter Zijlstra (Intel)" Subject: [PATCH -v2 3/7] module/modpost: Add basename helper References: <20241202145946.108093528@infradead.org> Precedence: bulk X-Mailing-List: linux-kbuild@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Signed-off-by: Peter Zijlstra (Intel) --- scripts/mod/modpost.c | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-) --- a/scripts/mod/modpost.c +++ b/scripts/mod/modpost.c @@ -1553,6 +1553,16 @@ static void mod_set_crcs(struct module * free(buf); } +static const char *mod_basename(const char *modname) +{ + const char *basename = strrchr(modname, '/'); + if (basename) + basename++; + else + basename = modname; + return basename; +} + static void read_symbols(const char *modname) { const char *symname; @@ -1697,11 +1707,7 @@ static void check_exports(struct module s->crc_valid = exp->crc_valid; s->crc = exp->crc; - basename = strrchr(mod->name, '/'); - if (basename) - basename++; - else - basename = mod->name; + basename = mod_basename(mod->name); if (!contains_namespace(&mod->imported_namespaces, exp->namespace)) { modpost_log(!allow_missing_ns_imports, From patchwork Mon Dec 2 14:59:50 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Zijlstra X-Patchwork-Id: 13890941 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CB71B1FECDE; 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Received: from 77-249-17-89.cable.dynamic.v4.ziggo.nl ([77.249.17.89] helo=noisy.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1tI859-00000008CPm-17Pt; Mon, 02 Dec 2024 15:11:28 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 0) id C9DFE300731; Mon, 2 Dec 2024 16:11:27 +0100 (CET) Message-ID: <20241202150810.382545529@infradead.org> User-Agent: quilt/0.66 Date: Mon, 02 Dec 2024 15:59:50 +0100 From: Peter Zijlstra To: mcgrof@kernel.org Cc: x86@kernel.org, hpa@zytor.com, petr.pavlu@suse.com, samitolvanen@google.com, da.gomez@samsung.com, masahiroy@kernel.org, nathan@kernel.org, nicolas@fjasle.eu, linux-kernel@vger.kernel.org, linux-modules@vger.kernel.org, linux-kbuild@vger.kernel.org, hch@infradead.org, gregkh@linuxfoundation.org, "Peter Zijlstra (Intel)" Subject: [PATCH -v2 4/7] module: Add module specific symbol namespace support References: <20241202145946.108093528@infradead.org> Precedence: bulk X-Mailing-List: linux-kbuild@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Designate the "MODULE_${modname}" symbol namespace to mean: 'only export to the named module'. Notably, explicit imports of anything in the "MODULE_" space is forbidden. Modules implicitly get the "MODULE_${modname}" namespace added. Signed-off-by: Peter Zijlstra (Intel) --- kernel/module/main.c | 28 ++++++++++++++++++++++++++-- scripts/mod/modpost.c | 5 +++++ 2 files changed, 31 insertions(+), 2 deletions(-) --- a/kernel/module/main.c +++ b/kernel/module/main.c @@ -1070,6 +1070,13 @@ static int verify_namespace_is_imported( namespace = kernel_symbol_namespace(sym); if (namespace && namespace[0]) { + /* + * Implicitly import MODULE_${mod->name} namespace. + */ + if (strncmp(namespace, "MODULE_", 7) == 0 && + strcmp(namespace+7, mod->name) == 0) + return 0; + for_each_modinfo_entry(imported_namespace, info, "import_ns") { if (strcmp(namespace, imported_namespace) == 0) return 0; @@ -1613,15 +1620,30 @@ static void module_license_taint_check(s } } -static void setup_modinfo(struct module *mod, struct load_info *info) +static int setup_modinfo(struct module *mod, struct load_info *info) { struct module_attribute *attr; + char *imported_namespace; int i; for (i = 0; (attr = modinfo_attrs[i]); i++) { if (attr->setup) attr->setup(mod, get_modinfo(info, attr->attr.name)); } + + for_each_modinfo_entry(imported_namespace, info, "import_ns") { + /* + * 'MODULE_' prefixed namespaces are implicit, disallow + * explicit imports. + */ + if (strstarts(imported_namespace, "MODULE_")) { + pr_err("%s: module tries to import module namespace: %s\n", + mod->name, imported_namespace); + return -EPERM; + } + } + + return 0; } static void free_modinfo(struct module *mod) @@ -2935,7 +2957,9 @@ static int load_module(struct load_info goto free_unload; /* Set up MODINFO_ATTR fields */ - setup_modinfo(mod, info); + err = setup_modinfo(mod, info); + if (err) + goto free_modinfo; /* Fix up syms, so that st_value is a pointer to location. */ err = simplify_symbols(mod, info); --- a/scripts/mod/modpost.c +++ b/scripts/mod/modpost.c @@ -1565,6 +1565,7 @@ static const char *mod_basename(const ch static void read_symbols(const char *modname) { + char module_namespace[MODULE_NAME_LEN + 8]; const char *symname; char *version; char *license; @@ -1600,6 +1601,10 @@ static void read_symbols(const char *mod namespace = get_next_modinfo(&info, "import_ns", namespace)) add_namespace(&mod->imported_namespaces, namespace); + snprintf(module_namespace, sizeof(module_namespace), "MODULE_%s", + mod_basename(mod->name)); + add_namespace(&mod->imported_namespaces, module_namespace); + if (extra_warn && !get_modinfo(&info, "description")) warn("missing MODULE_DESCRIPTION() in %s\n", modname); } From patchwork Mon Dec 2 14:59:51 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Zijlstra X-Patchwork-Id: 13890939 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4E824205ACC; Mon, 2 Dec 2024 15:11:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733152297; cv=none; b=ehsONdijU0vnjOYM5tET+juKlocWTd9SHSqT3qVOz6dR2pcDwLfZo1uTwgx6Y2pEq6e4NSxbMl7flKh/cUecOwBiTXWDCXcnfqfOKv/kYd3DBpFQhMKBwPujQaoWOU1PzM1zKTsXBT+cYxu61YWJn8P3aiMbmmq2m+woUiQYtdw= ARC-Message-Signature: i=1; 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That is, something like: "MODULE_foo-*,bar" is now possible. Signed-off-by: Peter Zijlstra (Intel) --- kernel/module/main.c | 39 ++++++++++++++++++++++++++++++++++----- scripts/mod/modpost.c | 40 ++++++++++++++++++++++++++++++++++------ 2 files changed, 68 insertions(+), 11 deletions(-) --- a/kernel/module/main.c +++ b/kernel/module/main.c @@ -1061,6 +1061,38 @@ static char *get_modinfo(const struct lo return get_next_modinfo(info, tag, NULL); } +/* + * @namespace ~= "MODULE_foo-*,bar", match @modname to 'foo-*' or 'bar' + */ +static bool verify_module_namespace(const char *namespace, const char *modname) +{ + size_t len, modlen = strlen(modname); + const char *sep; + bool glob; + + if (strncmp(namespace, "MODULE_", 7) != 0) + return false; + + for (namespace += 7; *namespace; namespace = sep) { + sep = strchrnul(namespace, ','); + len = sep - namespace; + + glob = false; + if (sep[-1] == '*') { + len--; + glob = true; + } + + if (*sep) + sep++; + + if (strncmp(namespace, modname, len) == 0 && (glob || len == modlen)) + return true; + } + + return false; +} + static int verify_namespace_is_imported(const struct load_info *info, const struct kernel_symbol *sym, struct module *mod) @@ -1070,11 +1102,8 @@ static int verify_namespace_is_imported( namespace = kernel_symbol_namespace(sym); if (namespace && namespace[0]) { - /* - * Implicitly import MODULE_${mod->name} namespace. - */ - if (strncmp(namespace, "MODULE_", 7) == 0 && - strcmp(namespace+7, mod->name) == 0) + + if (verify_module_namespace(namespace, mod->name)) return 0; for_each_modinfo_entry(imported_namespace, info, "import_ns") { --- a/scripts/mod/modpost.c +++ b/scripts/mod/modpost.c @@ -1565,7 +1565,6 @@ static const char *mod_basename(const ch static void read_symbols(const char *modname) { - char module_namespace[MODULE_NAME_LEN + 8]; const char *symname; char *version; char *license; @@ -1601,10 +1600,6 @@ static void read_symbols(const char *mod namespace = get_next_modinfo(&info, "import_ns", namespace)) add_namespace(&mod->imported_namespaces, namespace); - snprintf(module_namespace, sizeof(module_namespace), "MODULE_%s", - mod_basename(mod->name)); - add_namespace(&mod->imported_namespaces, module_namespace); - if (extra_warn && !get_modinfo(&info, "description")) warn("missing MODULE_DESCRIPTION() in %s\n", modname); } @@ -1687,6 +1682,38 @@ void buf_write(struct buffer *buf, const buf->pos += len; } +/* + * @namespace ~= "MODULE_foo-*,bar", match @modname to 'foo-*' or 'bar' + */ +static bool module_namespace(const char *namespace, const char *modname) +{ + size_t len, modlen = strlen(modname); + const char *sep; + bool glob; + + if (strncmp(namespace, "MODULE_", 7) != 0) + return false; + + for (namespace += 7; *namespace; namespace = sep) { + sep = strchrnul(namespace, ','); + len = sep - namespace; + + glob = false; + if (sep[-1] == '*') { + len--; + glob = true; + } + + if (*sep) + sep++; + + if (strncmp(namespace, modname, len) == 0 && (glob || len == modlen)) + return true; + } + + return false; +} + static void check_exports(struct module *mod) { struct symbol *s, *exp; @@ -1714,7 +1741,8 @@ static void check_exports(struct module basename = mod_basename(mod->name); - if (!contains_namespace(&mod->imported_namespaces, exp->namespace)) { + if (!module_namespace(exp->namespace, basename) && + !contains_namespace(&mod->imported_namespaces, exp->namespace)) { modpost_log(!allow_missing_ns_imports, "module %s uses symbol %s from namespace %s, but does not import it.\n", basename, exp->name, exp->namespace); From patchwork Mon Dec 2 14:59:52 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Zijlstra X-Patchwork-Id: 13890936 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7110C205ACD; Mon, 2 Dec 2024 15:11:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733152296; cv=none; b=BPdP+j0RlPt/ku4kgy81D8dFnZbU7V8AUV4du/Od4YY+MTn1ZjwvOSXy0ehPZOyqQpDeVp2SczCjcmuIAJgCqJy42KHg0xP0drTT7FiYS64iAA8pgZfwjEvzrxMQcpBlXjgl2witB5rhBt6Qr41Sqtl371SAbFWTRnrDPFAlFSo= ARC-Message-Signature: i=1; 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Since this happens late in the build, only the kernel needs to bother with this, the modpost tool still sees the original name. Reported-by: Sean Christopherson Signed-off-by: Peter Zijlstra (Intel) Tested-by: Sean Christopherson --- kernel/module/main.c | 26 +++++++++++++++++++++++++- 1 file changed, 25 insertions(+), 1 deletion(-) --- a/kernel/module/main.c +++ b/kernel/module/main.c @@ -1062,6 +1062,30 @@ static char *get_modinfo(const struct lo } /* + * Like strncmp(), except s/-/_/g as per scripts/Makefile.lib:name-fix-token rule. + */ +static int mod_strncmp(const char *str_a, const char *str_b, size_t n) +{ + for (int i = 0; i < n; i++) { + char a = str_a[i]; + char b = str_b[i]; + int d; + + if (a == '-') a = '_'; + if (b == '-') b = '_'; + + d = a - b; + if (d) + return d; + + if (!a) + break; + } + + return 0; +} + +/* * @namespace ~= "MODULE_foo-*,bar", match @modname to 'foo-*' or 'bar' */ static bool verify_module_namespace(const char *namespace, const char *modname) @@ -1086,7 +1110,7 @@ static bool verify_module_namespace(cons if (*sep) sep++; - if (strncmp(namespace, modname, len) == 0 && (glob || len == modlen)) + if (mod_strncmp(namespace, modname, len) == 0 && (glob || len == modlen)) return true; 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+ * + * As would be generated when using EXPORT_SYMBOL_GPL_FOR(foo, "kvm"), use + * varargs to assemble it like so: + * + * .ascii "MODULE_", "kvm", "\0" ; + * + */ +#define ___EXPORT_SYMBOL(sym, license, ns...) \ .section ".export_symbol","a" ASM_NL \ __export_symbol_##sym: ASM_NL \ .asciz license ASM_NL \ - .asciz ns ASM_NL \ + .ascii ns, "\0" ASM_NL \ __EXPORT_SYMBOL_REF(sym) ASM_NL \ .previous @@ -39,20 +51,20 @@ * be reused in other execution contexts such as the UEFI stub or the * decompressor. */ -#define __EXPORT_SYMBOL(sym, license, ns) +#define __EXPORT_SYMBOL(sym, license, ns...) #elif defined(__GENKSYMS__) -#define __EXPORT_SYMBOL(sym, license, ns) __GENKSYMS_EXPORT_SYMBOL(sym) +#define __EXPORT_SYMBOL(sym, license, ns...) __GENKSYMS_EXPORT_SYMBOL(sym) #elif defined(__ASSEMBLY__) -#define __EXPORT_SYMBOL(sym, license, ns) \ +#define __EXPORT_SYMBOL(sym, license, ns...) \ ___EXPORT_SYMBOL(sym, license, ns) #else -#define __EXPORT_SYMBOL(sym, license, ns) \ +#define __EXPORT_SYMBOL(sym, license, ns...) \ extern typeof(sym) sym; \ __ADDRESSABLE(sym) \ asm(__stringify(___EXPORT_SYMBOL(sym, license, ns))) @@ -70,4 +82,6 @@ #define EXPORT_SYMBOL_NS(sym, ns) __EXPORT_SYMBOL(sym, "", ns) #define EXPORT_SYMBOL_NS_GPL(sym, ns) __EXPORT_SYMBOL(sym, "GPL", ns) +#define EXPORT_SYMBOL_GPL_FOR(sym, mods) __EXPORT_SYMBOL(sym, "GPL", "MODULE_", mods) + #endif /* _LINUX_EXPORT_H */