linux-kernel - [PATCH v2 09/26] modpost: dump Module.symvers in the same order of modules.order

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20220501084032.1025918-10-masahiroy@kernel.org>
Date:   Sun,  1 May 2022 17:40:15 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     linux-kbuild@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Masahiro Yamada <masahiroy@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Michal Marek <michal.lkml@...kovi.net>
Subject: [PATCH v2 09/26] modpost: dump Module.symvers in the same order of modules.order

modpost dumps the exported symbols into Module.symvers, but currently
in random order because it iterates in the hash table.

Add a linked list of exported symbols in struct module, so we can
iterate on symbols per module.

This commit makes Module.symvers much more readable; the outer loop in
write_dump() iterates over the modules in the order of modules.order,
and the inner loop dumps symbols in each module.

Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>
---

(no changes since v1)

 scripts/mod/modpost.c | 29 +++++++++++++----------------
 scripts/mod/modpost.h |  1 +
 2 files changed, 14 insertions(+), 16 deletions(-)

diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index d0cf94e1e984..cd49ef7b5953 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -185,6 +185,7 @@ static struct module *new_module(const char *modname)
 	mod = NOFAIL(malloc(sizeof(*mod) + strlen(modname) + 1));
 	memset(mod, 0, sizeof(*mod));
 
+	INIT_LIST_HEAD(&mod->exported_symbols);
 	INIT_LIST_HEAD(&mod->unresolved_symbols);
 	INIT_LIST_HEAD(&mod->missing_namespaces);
 	INIT_LIST_HEAD(&mod->imported_namespaces);
@@ -211,7 +212,7 @@ static struct module *new_module(const char *modname)
 
 struct symbol {
 	struct symbol *next;
-	struct list_head list;	/* link to module::unresolved_symbols */
+	struct list_head list;	/* link to module::exported_symbols or module::unresolved_symbols */
 	struct module *module;
 	char *namespace;
 	unsigned int crc;
@@ -413,6 +414,7 @@ static struct symbol *sym_add_exported(const char *name, struct module *mod,
 
 	if (!s) {
 		s = new_symbol(name, mod, export);
+		list_add_tail(&s->list, &mod->exported_symbols);
 	} else if (!external_module || s->module->is_vmlinux ||
 		   s->module == mod) {
 		warn("%s: '%s' exported twice. Previous export was in %s%s\n",
@@ -2456,22 +2458,17 @@ static void read_dump(const char *fname)
 static void write_dump(const char *fname)
 {
 	struct buffer buf = { };
-	struct symbol *symbol;
-	const char *namespace;
-	int n;
+	struct module *mod;
+	struct symbol *sym;
 
-	for (n = 0; n < SYMBOL_HASH_SIZE ; n++) {
-		symbol = symbolhash[n];
-		while (symbol) {
-			if (!symbol->module->from_dump) {
-				namespace = symbol->namespace;
-				buf_printf(&buf, "0x%08x\t%s\t%s\t%s\t%s\n",
-					   symbol->crc, symbol->name,
-					   symbol->module->name,
-					   export_str(symbol->export),
-					   namespace ? namespace : "");
-			}
-			symbol = symbol->next;
+	list_for_each_entry(mod, &modules, list) {
+		if (mod->from_dump)
+			continue;
+		list_for_each_entry(sym, &mod->exported_symbols, list) {
+			buf_printf(&buf, "0x%08x\t%s\t%s\t%s\t%s\n",
+				   sym->crc, sym->name, mod->name,
+				   export_str(sym->export),
+				   sym->namespace ?: "");
 		}
 	}
 	write_buf(&buf, fname);
diff --git a/scripts/mod/modpost.h b/scripts/mod/modpost.h
index 2a8c1ad0305e..1c2d6498d764 100644
--- a/scripts/mod/modpost.h
+++ b/scripts/mod/modpost.h
@@ -111,6 +111,7 @@ buf_write(struct buffer *buf, const char *s, int len);
 
 struct module {
 	struct list_head list;
+	struct list_head exported_symbols;
 	struct list_head unresolved_symbols;
 	bool is_gpl_compatible;
 	bool from_dump;		/* true if module was loaded from *.symvers */
-- 
2.32.0