[lkml]   [2019]   [Feb]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [RFC v1 1/3] workqueue: Add resource-managed version of INIT_[DELAYED_]WORK()
On Mon, Feb 04, 2019 at 05:09:50PM -0500, Sven Van Asbroeck wrote:
> In modules which extensively use devm_ resource management, it is often
> easy to overlook (delayed) work that is left pending or running after the
> module is unloaded. This could introduce user-after-free issues.
> Nudge kernel developers into 'doing the right thing' by introducing a
> resource-managed version of INIT_[DELAYED_]WORK(). This can be used as
> an elegant way to ensure that work is not left pending or running after
> its dependencies are released.
> Functions introduced in workqueue.h :
> - devm_init_work()
> - devm_init_delayed_work()

I don't object to the basic idea but cancel_[delayed_]work_sync()
works iff queueing is disabled already, so there can be situations
where this can lead to surprising / subtle failures. Given that, it
*might* not be a bad idea to keep this explicit unless there is a way
to reliably block future queueing.



 \ /
  Last update: 2019-02-08 18:08    [W:0.211 / U:6.044 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site