[RFC PATCH 2/3] module: Don't fail module loading when setting ro_after_init section RO failed

From: Christophe Leroy
Date: Sat Nov 09 2024 - 05:36:28 EST


Once module init has succeded it is too late to cancel loading.
If setting ro_after_init data section to read-only fails, all we
can do is to inform the user through a warning.

Reported-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Closes: https://lore.kernel.org/all/20230915082126.4187913-1-ruanjinjie@xxxxxxxxxx/
Fixes: d1909c022173 ("module: Don't ignore errors from set_memory_XX()")
Signed-off-by: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
---
kernel/module/main.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/module/main.c b/kernel/module/main.c
index 2de4ad7af335..1bf4b0db291b 100644
--- a/kernel/module/main.c
+++ b/kernel/module/main.c
@@ -2583,7 +2583,9 @@ static noinline int do_init_module(struct module *mod)
#endif
ret = module_enable_rodata_ro_after_init(mod);
if (ret)
- goto fail_mutex_unlock;
+ pr_warn("%s: %s() returned %d, ro_after_init data might still be writable\n",
+ mod->name, __func__, ret);
+
mod_tree_remove_init(mod);
module_arch_freeing_init(mod);
for_class_mod_mem_type(type, init) {
@@ -2622,8 +2624,6 @@ static noinline int do_init_module(struct module *mod)

return 0;

-fail_mutex_unlock:
- mutex_unlock(&module_mutex);
fail_free_freeinit:
kfree(freeinit);
fail:
--
2.44.0