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Subject[PATCH 2/2] module: Enhance verify_export_symbols
Date
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>
---
kernel/module.c | 48 ++++++++++++++++++++++++------------------------
1 file changed, 24 insertions(+), 24 deletions(-)

diff -r 08e60e418777 kernel/module.c
--- a/kernel/module.c Tue Mar 18 11:30:06 2008 +1100
+++ b/kernel/module.c Tue Mar 18 14:05:37 2008 +1100
@@ -1397,33 +1397,33 @@ EXPORT_SYMBOL_GPL(__symbol_get);
*/
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. */

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