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authorRusty Russell <rusty@rustcorp.com.au>2014-05-14 10:54:19 +0930
committerRusty Russell <rusty@rustcorp.com.au>2014-05-14 10:55:47 +0930
commit4982223e51e8ea9d09bb33c8323b5ec1877b2b51 (patch)
treec944679cbc1b341771eceea899f0cccdf64c4c64 /kernel
parentde5109898a8a0cb001abcb6916bef4efa32bf39b (diff)
module: set nx before marking module MODULE_STATE_COMING.
We currently set RO & NX on modules very late: after we move them from MODULE_STATE_UNFORMED to MODULE_STATE_COMING, and after we call parse_args() (which can exec code in the module). Much better is to do it in complete_formation() and then call the notifier. This means that the notifiers will be called on a module which is already RO & NX, so that may cause problems (ftrace already changed so they're unaffected). Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/module.c32
1 files changed, 17 insertions, 15 deletions
diff --git a/kernel/module.c b/kernel/module.c
index 66e4e0d260a9..f944c72d3c8a 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -3023,21 +3023,6 @@ static int do_init_module(struct module *mod)
*/
current->flags &= ~PF_USED_ASYNC;
- blocking_notifier_call_chain(&module_notify_list,
- MODULE_STATE_COMING, mod);
-
- /* Set RO and NX regions for core */
- set_section_ro_nx(mod->module_core,
- mod->core_text_size,
- mod->core_ro_size,
- mod->core_size);
-
- /* Set RO and NX regions for init */
- set_section_ro_nx(mod->module_init,
- mod->init_text_size,
- mod->init_ro_size,
- mod->init_size);
-
do_mod_ctors(mod);
/* Start the module */
if (mod->init != NULL)
@@ -3168,9 +3153,26 @@ static int complete_formation(struct module *mod, struct load_info *info)
/* This relies on module_mutex for list integrity. */
module_bug_finalize(info->hdr, info->sechdrs, mod);
+ /* Set RO and NX regions for core */
+ set_section_ro_nx(mod->module_core,
+ mod->core_text_size,
+ mod->core_ro_size,
+ mod->core_size);
+
+ /* Set RO and NX regions for init */
+ set_section_ro_nx(mod->module_init,
+ mod->init_text_size,
+ mod->init_ro_size,
+ mod->init_size);
+
/* Mark state as coming so strong_try_module_get() ignores us,
* but kallsyms etc. can see us. */
mod->state = MODULE_STATE_COMING;
+ mutex_unlock(&module_mutex);
+
+ blocking_notifier_call_chain(&module_notify_list,
+ MODULE_STATE_COMING, mod);
+ return 0;
out:
mutex_unlock(&module_mutex);