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modpost: check forbidden MODULE_IMPORT_NS("module:") at compile time

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Explicitly adding MODULE_IMPORT_NS("module:...") is not allowed.

Currently, this is only checked at run time. That is, when such a
module is loaded, an error message like the following is shown:

  foo: module tries to import module namespace: module:bar

Obviously, checking this at compile time improves usability.

In such a case, modpost will report the following error at compile time:

  ERROR: modpost: foo: explicitly importing namespace "module:bar" is not allowed.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
This commit is contained in:
Masahiro Yamada 2025-05-22 16:17:20 +09:00
parent 8f81d8529e
commit 9c036cfbb7
1 changed files with 8 additions and 1 deletions
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9
scripts/mod/modpost.c
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@ -28,6 +28,8 @@
#include "modpost.h"
#include "../../include/linux/license.h"
#define MODULE_NS_PREFIX "module:"
static bool module_enabled;
/* Are we using CONFIG_MODVERSIONS? */
static bool modversions;
@ -1597,8 +1599,13 @@ static void read_symbols(const char *modname)
for (namespace = get_modinfo(&info, "import_ns");
namespace;
namespace = get_next_modinfo(&info, "import_ns", namespace))
namespace = get_next_modinfo(&info, "import_ns", namespace)) {
if (strstarts(namespace, MODULE_NS_PREFIX))
error("%s: explicitly importing namespace \"%s\" is not allowed.\n",
mod->name, namespace);
add_namespace(&mod->imported_namespaces, namespace);
}
if (!get_modinfo(&info, "description"))
warn("missing MODULE_DESCRIPTION() in %s\n", modname);