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From: Masahiro Yamada <yamada.masahiro@socionext.com>
To: Jessica Yu <jeyu@kernel.org>
Cc: Matthias Maennich <maennich@google.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Shaun Ruffell <sruffell@sruffell.net>,
	linux-kbuild@vger.kernel.org,
	Masahiro Yamada <yamada.masahiro@socionext.com>,
	Michal Marek <michal.lkml@markovi.net>,
	linux-kernel@vger.kernel.org
Subject: [PATCH v2 2/6] modpost: fix broken sym->namespace for external module builds
Date: Thu,  3 Oct 2019 16:58:22 +0900	[thread overview]
Message-ID: <20191003075826.7478-3-yamada.masahiro@socionext.com> (raw)
In-Reply-To: <20191003075826.7478-1-yamada.masahiro@socionext.com>

Currently, external module builds produce tons of false-positives:

  WARNING: module <mod> uses symbol <sym> from namespace <ns>, but does not import it.

Here, the <ns> part shows a random string.

When you build external modules, the symbol info of vmlinux and
in-kernel modules are read from $(objtree)/Module.symvers, but
read_dump() is buggy in multiple ways:

[1] When the modpost is run for vmlinux and in-kernel modules,
sym_extract_namespace() allocates memory for the namespace. On the
other hand, read_dump() does not, then sym->namespace will point to
somewhere in the line buffer of get_next_line(). The data in the
buffer will be replaced soon, and sym->namespace will end up with
pointing to unrelated data. As a result, check_exports() will show
random strings in the warning messages.

[2] When there is no namespace, sym_extract_namespace() returns NULL.
On the other hand, read_dump() sets namespace to an empty string "".
(but, it will be later replaced with unrelated data due to bug [1].)
The check_exports() shows a warning unless exp->namespace is NULL,
so every symbol read from read_dump() emits the warning, which is
mostly false positive.

To address [1], sym_add_exported() calls strdup() for s->namespace.
The namespace from sym_extract_namespace() must be freed to avoid
memory leak.

For [2], I changed the if-conditional in check_exports().

This commit also fixes sym_add_exported() to set s->namespace correctly
when the symbol is preloaded.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Matthias Maennich <maennich@google.com>
---

Changes in v2:
  - Change the approach to deal with ->preloaded

 scripts/mod/modpost.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index 2c644086c412..936d3ad23c83 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -166,7 +166,7 @@ struct symbol {
 	struct module *module;
 	unsigned int crc;
 	int crc_valid;
-	const char *namespace;
+	char *namespace;
 	unsigned int weak:1;
 	unsigned int vmlinux:1;    /* 1 if symbol is defined in vmlinux */
 	unsigned int kernel:1;     /* 1 if symbol is from kernel
@@ -348,7 +348,7 @@ static enum export export_from_sec(struct elf_info *elf, unsigned int sec)
 		return export_unknown;
 }
 
-static const char *sym_extract_namespace(const char **symname)
+static char *sym_extract_namespace(const char **symname)
 {
 	char *namespace = NULL;
 	char *ns_separator;
@@ -373,7 +373,6 @@ static struct symbol *sym_add_exported(const char *name, const char *namespace,
 
 	if (!s) {
 		s = new_symbol(name, mod, export);
-		s->namespace = namespace;
 	} else {
 		if (!s->preloaded) {
 			warn("%s: '%s' exported twice. Previous export was in %s%s\n",
@@ -384,6 +383,8 @@ static struct symbol *sym_add_exported(const char *name, const char *namespace,
 			s->module = mod;
 		}
 	}
+	free(s->namespace);
+	s->namespace = namespace ? strdup(namespace) : NULL;
 	s->preloaded = 0;
 	s->vmlinux   = is_vmlinux(mod->name);
 	s->kernel    = 0;
@@ -670,7 +671,8 @@ static void handle_modversions(struct module *mod, struct elf_info *info,
 	unsigned int crc;
 	enum export export;
 	bool is_crc = false;
-	const char *name, *namespace;
+	const char *name;
+	char *namespace;
 
 	if ((!is_vmlinux(mod->name) || mod->is_dot_o) &&
 	    strstarts(symname, "__ksymtab"))
@@ -745,6 +747,7 @@ static void handle_modversions(struct module *mod, struct elf_info *info,
 			name = symname + strlen("__ksymtab_");
 			namespace = sym_extract_namespace(&name);
 			sym_add_exported(name, namespace, mod, export);
+			free(namespace);
 		}
 		if (strcmp(symname, "init_module") == 0)
 			mod->has_init = 1;
@@ -2193,7 +2196,7 @@ static int check_exports(struct module *mod)
 		else
 			basename = mod->name;
 
-		if (exp->namespace) {
+		if (exp->namespace && exp->namespace[0]) {
 			add_namespace(&mod->required_namespaces,
 				      exp->namespace);
 
-- 
2.17.1


  parent reply	other threads:[~2019-10-03  7:59 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-03  7:58 [PATCH v2 0/6] module: various bug-fixes and clean-ups for module namespace Masahiro Yamada
2019-10-03  7:58 ` [PATCH v2 1/6] module: swap the order of symbol.namespace Masahiro Yamada
2019-10-03  7:58 ` Masahiro Yamada [this message]
2019-10-03  6:29   ` [PATCH v2 2/6] modpost: fix broken sym->namespace for external module builds Shaun Ruffell
2019-10-03 14:42     ` Masahiro Yamada
2019-10-04 15:10       ` Jessica Yu
2019-10-03  7:58 ` [PATCH v2 3/6] module: rename __kstrtab_ns_* to __kstrtabns_* to avoid symbol conflict Masahiro Yamada
2019-10-03  7:58 ` [PATCH v2 4/6] kbuild: fix build error of 'make nsdeps' in clean tree Masahiro Yamada
2019-10-03  7:58 ` [PATCH v2 5/6] nsdeps: fix hashbang of scripts/nsdeps Masahiro Yamada
2019-10-03  7:58 ` [PATCH v2 6/6] nsdeps: make generated patches independent of locale Masahiro Yamada
2019-10-07 16:43 ` [PATCH v2 0/6] module: various bug-fixes and clean-ups for module namespace Jessica Yu

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