module: Enhance verify_export_symbols
Make verify_export_symbols check the modules unused, unused_gpl and
gpl_future syms.
Inspired by Jan Beulich's fix, but table-driven.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
diff --git a/kernel/module.c b/kernel/module.c
index ee91893..d2d093e 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -1400,33 +1400,33 @@
*/
static int verify_export_symbols(struct module *mod)
{
- const char *name = NULL;
- unsigned long i, ret = 0;
+ unsigned int i;
struct module *owner;
- const unsigned long *crc;
+ const struct kernel_symbol *s;
+ struct {
+ const struct kernel_symbol *sym;
+ unsigned int num;
+ } arr[] = {
+ { mod->syms, mod->num_syms },
+ { mod->gpl_syms, mod->num_gpl_syms },
+ { mod->gpl_future_syms, mod->num_gpl_future_syms },
+ { mod->unused_syms, mod->num_unused_syms },
+ { mod->unused_gpl_syms, mod->num_unused_gpl_syms },
+ };
- for (i = 0; i < mod->num_syms; i++)
- if (!IS_ERR_VALUE(find_symbol(mod->syms[i].name,
- &owner, &crc, true, false))) {
- name = mod->syms[i].name;
- ret = -ENOEXEC;
- goto dup;
+ for (i = 0; i < ARRAY_SIZE(arr); i++) {
+ for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) {
+ if (!IS_ERR_VALUE(find_symbol(s->name, &owner,
+ NULL, true, false))) {
+ printk(KERN_ERR
+ "%s: exports duplicate symbol %s"
+ " (owned by %s)\n",
+ mod->name, s->name, module_name(owner));
+ return -ENOEXEC;
+ }
}
-
- for (i = 0; i < mod->num_gpl_syms; i++)
- if (!IS_ERR_VALUE(find_symbol(mod->gpl_syms[i].name,
- &owner, &crc, true, false))) {
- name = mod->gpl_syms[i].name;
- ret = -ENOEXEC;
- goto dup;
- }
-
-dup:
- if (ret)
- printk(KERN_ERR "%s: exports duplicate symbol %s (owned by %s)\n",
- mod->name, name, module_name(owner));
-
- return ret;
+ }
+ return 0;
}
/* Change all symbols so that st_value encodes the pointer directly. */