aboutsummaryrefslogtreecommitdiff
path: root/scripts/mod/modpost.c
diff options
context:
space:
mode:
Diffstat (limited to 'scripts/mod/modpost.c')
-rw-r--r--scripts/mod/modpost.c177
1 files changed, 158 insertions, 19 deletions
diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index d0f86ed43f7..0dd16177642 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;
@@ -22,6 +23,8 @@ int have_vmlinux = 0;
static int all_versions = 0;
/* If we are modposting external module set to 1 */
static int external_module = 0;
+/* How a symbol is exported */
+enum export {export_plain, export_gpl, export_gpl_future, export_unknown};
void fatal(const char *fmt, ...)
{
@@ -97,6 +100,7 @@ static struct module *new_module(char *modname)
/* add to list */
mod->name = p;
+ mod->gpl_compatible = -1;
mod->next = modules;
modules = mod;
@@ -118,6 +122,7 @@ struct symbol {
unsigned int kernel:1; /* 1 if symbol is from kernel
* (only for external modules) **/
unsigned int preloaded:1; /* 1 if symbol from Module.symvers */
+ enum export export; /* Type of export */
char name[0];
};
@@ -153,7 +158,8 @@ static struct symbol *alloc_symbol(const char *name, unsigned int weak,
}
/* For the hash of exported symbols */
-static struct symbol *new_symbol(const char *name, struct module *module)
+static struct symbol *new_symbol(const char *name, struct module *module,
+ enum export export)
{
unsigned int hash;
struct symbol *new;
@@ -161,6 +167,7 @@ static struct symbol *new_symbol(const char *name, struct module *module)
hash = tdb_hash(name) % SYMBOL_HASH_SIZE;
new = symbolhash[hash] = alloc_symbol(name, 0, symbolhash[hash]);
new->module = module;
+ new->export = export;
return new;
}
@@ -179,16 +186,55 @@ static struct symbol *find_symbol(const char *name)
return NULL;
}
+static struct {
+ const char *str;
+ enum export export;
+} export_list[] = {
+ { .str = "EXPORT_SYMBOL", .export = export_plain },
+ { .str = "EXPORT_SYMBOL_GPL", .export = export_gpl },
+ { .str = "EXPORT_SYMBOL_GPL_FUTURE", .export = export_gpl_future },
+ { .str = "(unknown)", .export = export_unknown },
+};
+
+
+static const char *export_str(enum export ex)
+{
+ return export_list[ex].str;
+}
+
+static enum export export_no(const char * s)
+{
+ int i;
+ for (i = 0; export_list[i].export != export_unknown; i++) {
+ if (strcmp(export_list[i].str, s) == 0)
+ return export_list[i].export;
+ }
+ return export_unknown;
+}
+
+static enum export export_from_sec(struct elf_info *elf, Elf_Section sec)
+{
+ if (sec == elf->export_sec)
+ return export_plain;
+ else if (sec == elf->export_gpl_sec)
+ return export_gpl;
+ else if (sec == elf->export_gpl_future_sec)
+ return export_gpl_future;
+ else
+ return export_unknown;
+}
+
/**
* Add an exported symbol - it may have already been added without a
* CRC, in this case just update the CRC
**/
-static struct symbol *sym_add_exported(const char *name, struct module *mod)
+static struct symbol *sym_add_exported(const char *name, struct module *mod,
+ enum export export)
{
struct symbol *s = find_symbol(name);
if (!s) {
- s = new_symbol(name, mod);
+ s = new_symbol(name, mod, export);
} else {
if (!s->preloaded) {
warn("%s: '%s' exported twice. Previous export "
@@ -200,16 +246,17 @@ static struct symbol *sym_add_exported(const char *name, struct module *mod)
s->preloaded = 0;
s->vmlinux = is_vmlinux(mod->name);
s->kernel = 0;
+ s->export = export;
return s;
}
static void sym_update_crc(const char *name, struct module *mod,
- unsigned int crc)
+ unsigned int crc, enum export export)
{
struct symbol *s = find_symbol(name);
if (!s)
- s = new_symbol(name, mod);
+ s = new_symbol(name, mod, export);
s->crc = crc;
s->crc_valid = 1;
}
@@ -283,7 +330,7 @@ static void parse_elf(struct elf_info *info, const char *filename)
hdr = grab_file(filename, &info->size);
if (!hdr) {
perror(filename);
- abort();
+ exit(1);
}
info->hdr = hdr;
if (info->size < sizeof(*hdr))
@@ -309,13 +356,21 @@ static void parse_elf(struct elf_info *info, const char *filename)
for (i = 1; i < hdr->e_shnum; i++) {
const char *secstrings
= (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
+ const char *secname;
if (sechdrs[i].sh_offset > info->size)
goto truncated;
- if (strcmp(secstrings+sechdrs[i].sh_name, ".modinfo") == 0) {
+ secname = secstrings + sechdrs[i].sh_name;
+ if (strcmp(secname, ".modinfo") == 0) {
info->modinfo = (void *)hdr + sechdrs[i].sh_offset;
info->modinfo_len = sechdrs[i].sh_size;
- }
+ } else if (strcmp(secname, "__ksymtab") == 0)
+ info->export_sec = i;
+ else if (strcmp(secname, "__ksymtab_gpl") == 0)
+ info->export_gpl_sec = i;
+ else if (strcmp(secname, "__ksymtab_gpl_future") == 0)
+ info->export_gpl_future_sec = i;
+
if (sechdrs[i].sh_type != SHT_SYMTAB)
continue;
@@ -353,6 +408,7 @@ static void handle_modversions(struct module *mod, struct elf_info *info,
Elf_Sym *sym, const char *symname)
{
unsigned int crc;
+ enum export export = export_from_sec(info, sym->st_shndx);
switch (sym->st_shndx) {
case SHN_COMMON:
@@ -362,7 +418,8 @@ static void handle_modversions(struct module *mod, struct elf_info *info,
/* CRC'd symbol */
if (memcmp(symname, CRC_PFX, strlen(CRC_PFX)) == 0) {
crc = (unsigned int) sym->st_value;
- sym_update_crc(symname + strlen(CRC_PFX), mod, crc);
+ sym_update_crc(symname + strlen(CRC_PFX), mod, crc,
+ export);
}
break;
case SHN_UNDEF:
@@ -406,7 +463,8 @@ static void handle_modversions(struct module *mod, struct elf_info *info,
default:
/* All exported symbols */
if (memcmp(symname, KSYMTAB_PFX, strlen(KSYMTAB_PFX)) == 0) {
- sym_add_exported(symname + strlen(KSYMTAB_PFX), mod);
+ sym_add_exported(symname + strlen(KSYMTAB_PFX), mod,
+ export);
}
if (strcmp(symname, MODULE_SYMBOL_PREFIX "init_module") == 0)
mod->has_init = 1;
@@ -437,13 +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;
@@ -451,6 +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
@@ -821,6 +891,10 @@ static int init_section_ref_ok(const char *name)
".pci_fixup_final",
".pdr",
"__param",
+ "__ex_table",
+ ".fixup",
+ ".smp_locks",
+ ".plt", /* seen on ARCH=um build on x86_64. Harmless */
NULL
};
/* Start of section names */
@@ -846,6 +920,8 @@ static int init_section_ref_ok(const char *name)
for (s = namelist3; *s; s++)
if (strstr(name, *s) != NULL)
return 1;
+ if (strrcmp(name, ".init") == 0)
+ return 1;
return 0;
}
@@ -892,6 +968,10 @@ static int exit_section_ref_ok(const char *name)
".exitcall.exit",
".eh_frame",
".stab",
+ "__ex_table",
+ ".fixup",
+ ".smp_locks",
+ ".plt", /* seen on ARCH=um build on x86_64. Harmless */
NULL
};
/* Start of section names */
@@ -921,6 +1001,7 @@ static void read_symbols(char *modname)
{
const char *symname;
char *version;
+ char *license;
struct module *mod;
struct elf_info info = { };
Elf_Sym *sym;
@@ -936,6 +1017,18 @@ 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;
@@ -992,6 +1085,41 @@ 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) {
+ const char *basename;
+ if (mod->gpl_compatible == 1) {
+ /* GPL-compatible modules may use all symbols */
+ continue;
+ }
+ exp = find_symbol(s->name);
+ if (!exp || exp->module == mod)
+ continue;
+ 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
**/
@@ -1142,6 +1270,9 @@ static void write_if_changed(struct buffer *b, const char *fname)
fclose(file);
}
+/* parse Module.symvers file. line format:
+ * 0x12345678<tab>symbol<tab>module[<tab>export]
+ **/
static void read_dump(const char *fname, unsigned int kernel)
{
unsigned long size, pos = 0;
@@ -1153,7 +1284,7 @@ static void read_dump(const char *fname, unsigned int kernel)
return;
while ((line = get_next_line(&pos, file, size))) {
- char *symname, *modname, *d;
+ char *symname, *modname, *d, *export;
unsigned int crc;
struct module *mod;
struct symbol *s;
@@ -1164,8 +1295,9 @@ static void read_dump(const char *fname, unsigned int kernel)
if (!(modname = strchr(symname, '\t')))
goto fail;
*modname++ = '\0';
- if (strchr(modname, '\t'))
- goto fail;
+ if ((export = strchr(modname, '\t')) != NULL)
+ *export++ = '\0';
+
crc = strtoul(line, &d, 16);
if (*symname == '\0' || *modname == '\0' || *d != '\0')
goto fail;
@@ -1177,10 +1309,10 @@ static void read_dump(const char *fname, unsigned int kernel)
mod = new_module(NOFAIL(strdup(modname)));
mod->skip = 1;
}
- s = sym_add_exported(symname, mod);
+ s = sym_add_exported(symname, mod, export_no(export));
s->kernel = kernel;
s->preloaded = 1;
- sym_update_crc(symname, mod, crc);
+ sym_update_crc(symname, mod, crc, export_no(export));
}
return;
fail:
@@ -1210,9 +1342,10 @@ static void write_dump(const char *fname)
symbol = symbolhash[n];
while (symbol) {
if (dump_sym(symbol))
- buf_printf(&buf, "0x%08x\t%s\t%s\n",
+ buf_printf(&buf, "0x%08x\t%s\t%s\t%s\n",
symbol->crc, symbol->name,
- symbol->module->name);
+ symbol->module->name,
+ export_str(symbol->export));
symbol = symbol->next;
}
}
@@ -1263,6 +1396,12 @@ 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;
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-02 01:11:35 +0000