module: Clean up ro/nx after early module load failures

The commit 4982223e51e8 module: set nx before marking module MODULE_STATE_COMING. introduced a regression: if a module fails to parse its arguments or if mod_sysfs_setup fails, then the module's memory will be freed while still read-only. Anything that reuses that memory will crash as soon as it tries to write to it.

Andy Lutomirski committed 12 years ago

Commit ff7e0051 parent c9d26421 file · +5 −0Browse files

Showing the changes to kernel/module.c (1 of 1 file). Show all

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kernel/module.c+5−0

@@ -3304,6 +3304,11 @@ static int load_module(struct load_info info, const char __user uargs, · 3303 unmodified lines
3304	3304	mutex_lock(&module_mutex);
3305	3305	module_bug_cleanup(mod);
3306	3306	mutex_unlock(&module_mutex);
	3307	+
	3308	+ /* we can't deallocate the module until we clear memory protection */
	3309	+ unset_module_init_ro_nx(mod);
	3310	+ unset_module_core_ro_nx(mod);
	3311	+
3307	3312	ddebug_cleanup:
3308	3313	dynamic_debug_remove(info->debug);
3309	3314	synchronize_sched();