openharmony/kernel_linux
1
0
Fork 0
mirror of https://gitee.com/openharmony/kernel_linux synced 2025-02-25 06:02:34 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

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

Browse Source 
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.

Cc: stable@vger.kernel.org # v3.16
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Andy Lutomirski 2014-08-16 04:13:37 +09:30 committed by Rusty Russell
parent c9d26423e5
commit ff7e0055bb
1 changed files with 5 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
kernel/module.c
View File

@ -3304,6 +3304,11 @@ static int load_module(struct load_info *info, const char __user *uargs,
mutex_lock(&module_mutex);
module_bug_cleanup(mod);
mutex_unlock(&module_mutex);
/* we can't deallocate the module until we clear memory protection */
unset_module_init_ro_nx(mod);
unset_module_core_ro_nx(mod);
ddebug_cleanup:
dynamic_debug_remove(info->debug);
synchronize_sched();