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module: Add module specific symbol namespace support

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Designate the "module:${modname}" symbol namespace to mean: 'only
export to the named module'.

Notably, explicit imports of anything in the "module:" space is
forbidden.

Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Reviewed-by: Petr Pavlu <petr.pavlu@suse.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
This commit is contained in:
Peter Zijlstra
2025-05-02 16:12:06 +02:00
committed by Masahiro Yamada
parent 6b91ff002c
commit 520b1a147d
2 changed files with 41 additions and 3 deletions
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11
scripts/mod/modpost.c
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@@ -1682,6 +1682,14 @@ void buf_write(struct buffer *buf, const char *s, int len)
buf->pos += len;
}
static bool verify_module_namespace(const char *namespace, const char *modname)
{
const char *prefix = "module:";
return strstarts(namespace, prefix) &&
!strcmp(namespace + strlen(prefix), modname);
}
static void check_exports(struct module *mod)
{
struct symbol *s, *exp;
@@ -1709,7 +1717,8 @@ static void check_exports(struct module *mod)
basename = get_basename(mod->name);
if (!contains_namespace(&mod->imported_namespaces, exp->namespace)) {
if (!verify_module_namespace(exp->namespace, basename) &&
!contains_namespace(&mod->imported_namespaces, exp->namespace)) {
modpost_log(!allow_missing_ns_imports,
"module %s uses symbol %s from namespace %s, but does not import it.\n",
basename, exp->name, exp->namespace);