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-rw-r--r--include/linux/license.h14
-rw-r--r--kernel/module.c11
-rw-r--r--scripts/mod/modpost.c71
-rw-r--r--scripts/mod/modpost.h1
4 files changed, 85 insertions, 12 deletions
diff --git a/include/linux/license.h b/include/linux/license.h
new file mode 100644
index 0000000..decdbf4
--- /dev/null
+++ b/include/linux/license.h
@@ -0,0 +1,14 @@
+#ifndef __LICENSE_H
+#define __LICENSE_H
+
+static inline int license_is_gpl_compatible(const char *license)
+{
+ return (strcmp(license, "GPL") == 0
+ || strcmp(license, "GPL v2") == 0
+ || strcmp(license, "GPL and additional rights") == 0
+ || strcmp(license, "Dual BSD/GPL") == 0
+ || strcmp(license, "Dual MIT/GPL") == 0
+ || strcmp(license, "Dual MPL/GPL") == 0);
+}
+
+#endif
diff --git a/kernel/module.c b/kernel/module.c
index bbe0486..6903815 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -43,6 +43,7 @@
#include <asm/uaccess.h>
#include <asm/semaphore.h>
#include <asm/cacheflush.h>
+#include <linux/license.h>
#if 0
#define DEBUGP printk
@@ -1248,16 +1249,6 @@ static void layout_sections(struct module *mod,
}
}
-static inline int license_is_gpl_compatible(const char *license)
-{
- return (strcmp(license, "GPL") == 0
- || strcmp(license, "GPL v2") == 0
- || strcmp(license, "GPL and additional rights") == 0
- || strcmp(license, "Dual BSD/GPL") == 0
- || strcmp(license, "Dual MIT/GPL") == 0
- || strcmp(license, "Dual MPL/GPL") == 0);
-}
-
static void set_license(struct module *mod, const char *license)
{
if (!license)
diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index ba2e4fc..baa4d83 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -13,6 +13,7 @@
#include <ctype.h>
#include "modpost.h"
+#include "../../include/linux/license.h"
/* Are we using CONFIG_MODVERSIONS? */
int modversions = 0;
@@ -99,6 +100,7 @@ static struct module *new_module(char *modname)
/* add to list */
mod->name = p;
+ mod->gpl_compatible = -1;
mod->next = modules;
modules = mod;
@@ -493,13 +495,18 @@ static char *next_string(char *string, unsigned long *secsize)
return string;
}
-static char *get_modinfo(void *modinfo, unsigned long modinfo_len,
- const char *tag)
+static char *get_next_modinfo(void *modinfo, unsigned long modinfo_len,
+ const char *tag, char *info)
{
char *p;
unsigned int taglen = strlen(tag);
unsigned long size = modinfo_len;
+ if (info) {
+ size -= info - (char *)modinfo;
+ modinfo = next_string(info, &size);
+ }
+
for (p = modinfo; p; p = next_string(p, &size)) {
if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
return p + taglen + 1;
@@ -507,6 +514,13 @@ static char *get_modinfo(void *modinfo, unsigned long modinfo_len,
return NULL;
}
+static char *get_modinfo(void *modinfo, unsigned long modinfo_len,
+ const char *tag)
+
+{
+ return get_next_modinfo(modinfo, modinfo_len, tag, NULL);
+}
+
/**
* Test if string s ends in string sub
* return 0 if match
@@ -981,6 +995,7 @@ static void read_symbols(char *modname)
{
const char *symname;
char *version;
+ char *license;
struct module *mod;
struct elf_info info = { };
Elf_Sym *sym;
@@ -996,6 +1011,18 @@ static void read_symbols(char *modname)
mod->skip = 1;
}
+ license = get_modinfo(info.modinfo, info.modinfo_len, "license");
+ while (license) {
+ if (license_is_gpl_compatible(license))
+ mod->gpl_compatible = 1;
+ else {
+ mod->gpl_compatible = 0;
+ break;
+ }
+ license = get_next_modinfo(info.modinfo, info.modinfo_len,
+ "license", license);
+ }
+
for (sym = info.symtab_start; sym < info.symtab_stop; sym++) {
symname = info.strtab + sym->st_name;
@@ -1052,6 +1079,40 @@ void buf_write(struct buffer *buf, const char *s, int len)
buf->pos += len;
}
+void check_license(struct module *mod)
+{
+ struct symbol *s, *exp;
+
+ for (s = mod->unres; s; s = s->next) {
+ if (mod->gpl_compatible == 1) {
+ /* GPL-compatible modules may use all symbols */
+ continue;
+ }
+ exp = find_symbol(s->name);
+ if (!exp || exp->module == mod)
+ continue;
+ const char *basename = strrchr(mod->name, '/');
+ if (basename)
+ basename++;
+ switch (exp->export) {
+ case export_gpl:
+ fatal("modpost: GPL-incompatible module %s "
+ "uses GPL-only symbol '%s'\n",
+ basename ? basename : mod->name,
+ exp->name);
+ break;
+ case export_gpl_future:
+ warn("modpost: GPL-incompatible module %s "
+ "uses future GPL-only symbol '%s'\n",
+ basename ? basename : mod->name,
+ exp->name);
+ break;
+ case export_plain: /* ignore */ break;
+ case export_unknown: /* ignore */ break;
+ }
+ }
+}
+
/**
* Header for the generated file
**/
@@ -1328,6 +1389,12 @@ int main(int argc, char **argv)
for (mod = modules; mod; mod = mod->next) {
if (mod->skip)
continue;
+ check_license(mod);
+ }
+
+ for (mod = modules; mod; mod = mod->next) {
+ if (mod->skip)
+ continue;
buf.pos = 0;
diff --git a/scripts/mod/modpost.h b/scripts/mod/modpost.h
index f7ee3a3..2b00c60 100644
--- a/scripts/mod/modpost.h
+++ b/scripts/mod/modpost.h
@@ -100,6 +100,7 @@ buf_write(struct buffer *buf, const char *s, int len);
struct module {
struct module *next;
const char *name;
+ int gpl_compatible;
struct symbol *unres;
int seen;
int skip;
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