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module: Enhance verify_export_symbols

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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>
This commit is contained in:
Rusty Russell 2008-05-01 21:15:00 -05:00
parent 4e2d92454b
commit b211104d11
1 changed files with 24 additions and 24 deletions
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48
kernel/module.c
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@ -1400,33 +1400,33 @@ 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. */