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module: add config option MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS

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If MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS is enabled (default=n), the
requirement for modules to import all namespaces that are used by
the module is relaxed.

Enabling this option effectively allows (invalid) modules to be loaded
while only a warning is emitted.

Disabling this option keeps the enforcement at module loading time and
loading is denied if the module's imports are not satisfactory.

Reviewed-by: Martijn Coenen <maco@android.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Matthias Maennich <maennich@google.com>
Signed-off-by: Jessica Yu <jeyu@kernel.org>
This commit is contained in:
Matthias Maennich
2019-09-06 11:32:29 +01:00
committed by Jessica Yu
parent cb9b55d21f
commit 3d52ec5e5d
2 changed files with 22 additions and 2 deletions
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11
kernel/module.c
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@@ -1408,9 +1408,16 @@ static int verify_namespace_is_imported(const struct load_info *info,
imported_namespace = get_next_modinfo(
info, "import_ns", imported_namespace);
}
pr_err("%s: module uses symbol (%s) from namespace %s, but does not import it.\n",
mod->name, kernel_symbol_name(sym), namespace);
#ifdef CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS
pr_warn(
#else
pr_err(
#endif
"%s: module uses symbol (%s) from namespace %s, but does not import it.\n",
mod->name, kernel_symbol_name(sym), namespace);
#ifndef CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS
return -EINVAL;
#endif
}
return 0;
}