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From:   Masahiro Yamada <masahiroy@kernel.org>
To:     linux-kbuild@vger.kernel.org
Cc:     linux-kernel@vger.kernel.org,
        Masahiro Yamada <masahiroy@kernel.org>,
        Michal Marek <michal.lkml@markovi.net>,
        Nick Desaulniers <ndesaulniers@google.com>
Subject: [PATCH 3/5] modpost: simplify mod->name allocation
Date:   Tue, 24 May 2022 01:46:24 +0900
Message-Id: <20220523164626.858340-3-masahiroy@kernel.org>
In-Reply-To: <20220523164626.858340-1-masahiroy@kernel.org>
References: <20220523164626.858340-1-masahiroy@kernel.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
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mod->name is set to the ELF filename with the suffix ".o" stripped.

The current code calls strdup() and free() to manipulate the string,
but a simpler approach is to pass new_module() with the name length
subtracted by 2.

Also, check if the passed filename ends with ".o" before stripping it.

The current code blindly chops the suffix

    tmp[strlen(tmp) - 2] = '\0'

but it will cause buffer under-run if strlen(tmp) < 2;

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
---

 scripts/mod/modpost.c | 25 ++++++++++++-------------
 1 file changed, 12 insertions(+), 13 deletions(-)

diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index 843c64eebe8b..77c315dea1a3 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -172,11 +172,11 @@ static struct module *find_module(const char *modname)
 	return NULL;
 }
 
-static struct module *new_module(const char *modname)
+static struct module *new_module(const char *name, size_t namelen)
 {
 	struct module *mod;
 
-	mod = NOFAIL(malloc(sizeof(*mod) + strlen(modname) + 1));
+	mod = NOFAIL(malloc(sizeof(*mod) + namelen + 1));
 	memset(mod, 0, sizeof(*mod));
 
 	INIT_LIST_HEAD(&mod->exported_symbols);
@@ -184,8 +184,9 @@ static struct module *new_module(const char *modname)
 	INIT_LIST_HEAD(&mod->missing_namespaces);
 	INIT_LIST_HEAD(&mod->imported_namespaces);
 
-	strcpy(mod->name, modname);
-	mod->is_vmlinux = (strcmp(modname, "vmlinux") == 0);
+	memcpy(mod->name, name, namelen);
+	mod->name[namelen] = '\0';
+	mod->is_vmlinux = (strcmp(mod->name, "vmlinux") == 0);
 
 	/*
 	 * Set mod->is_gpl_compatible to true by default. If MODULE_LICENSE()
@@ -2022,16 +2023,14 @@ static void read_symbols(const char *modname)
 	if (!parse_elf(&info, modname))
 		return;
 
-	{
-		char *tmp;
-
-		/* strip trailing .o */
-		tmp = NOFAIL(strdup(modname));
-		tmp[strlen(tmp) - 2] = '\0';
-		mod = new_module(tmp);
-		free(tmp);
+	if (!strends(modname, ".o")) {
+		error("%s: filename must be suffixed with .o\n", modname);
+		return;
 	}
 
+	/* strip trailing .o */
+	mod = new_module(modname, strlen(modname) - strlen(".o"));
+
 	if (!mod->is_vmlinux) {
 		license = get_modinfo(&info, "license");
 		if (!license)
@@ -2493,7 +2492,7 @@ static void read_dump(const char *fname)
 
 		mod = find_module(modname);
 		if (!mod) {
-			mod = new_module(modname);
+			mod = new_module(modname, strlen(modname));
 			mod->from_dump = true;
 		}
 		s = sym_add_exported(symname, mod, gpl_only);
-- 
2.32.0