Re: [RFC v2 PATCH] futex: extend set_robust_list to allow 2 locking ABIs at the same time.
flat view
From: Zack Weinberg <hidden>
Date: 2019-11-06 14:16:33
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lkml
On Tue, Nov 5, 2019 at 9:28 AM Thomas Gleixner [off-list ref] wrote:
The real issue is that the robust list could be circular by incident or malice and there is no way for the kernel to figure that out. That would prevent the task from exiting and make it iterate over the list until doomsday, i.e. a nice unpriviledged DoS.
Why can't the kernel use the standard tortoise-and-hare algorithm for detecting circular linked lists here? zw