https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: f55532a0c0b8bb6148f4e07853b876ef73bc69ca authored by Linus Torvalds on 26 March 2016, 23:03:24 UTC
Linux 4.6-rc1
Linux 4.6-rc1
Tip revision: f55532a
dm-builtin.c
#include "dm.h"
/*
* The kobject release method must not be placed in the module itself,
* otherwise we are subject to module unload races.
*
* The release method is called when the last reference to the kobject is
* dropped. It may be called by any other kernel code that drops the last
* reference.
*
* The release method suffers from module unload race. We may prevent the
* module from being unloaded at the start of the release method (using
* increased module reference count or synchronizing against the release
* method), however there is no way to prevent the module from being
* unloaded at the end of the release method.
*
* If this code were placed in the dm module, the following race may
* happen:
* 1. Some other process takes a reference to dm kobject
* 2. The user issues ioctl function to unload the dm device
* 3. dm_sysfs_exit calls kobject_put, however the object is not released
* because of the other reference taken at step 1
* 4. dm_sysfs_exit waits on the completion
* 5. The other process that took the reference in step 1 drops it,
* dm_kobject_release is called from this process
* 6. dm_kobject_release calls complete()
* 7. a reschedule happens before dm_kobject_release returns
* 8. dm_sysfs_exit continues, the dm device is unloaded, module reference
* count is decremented
* 9. The user unloads the dm module
* 10. The other process that was rescheduled in step 7 continues to run,
* it is now executing code in unloaded module, so it crashes
*
* Note that if the process that takes the foreign reference to dm kobject
* has a low priority and the system is sufficiently loaded with
* higher-priority processes that prevent the low-priority process from
* being scheduled long enough, this bug may really happen.
*
* In order to fix this module unload race, we place the release method
* into a helper code that is compiled directly into the kernel.
*/
void dm_kobject_release(struct kobject *kobj)
{
complete(dm_get_completion_from_kobject(kobj));
}
EXPORT_SYMBOL(dm_kobject_release);