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A comment on Google, Xiaomi, and Huawei affected by zero-day flaw that unlocks root access. Parent comment

Re:Google, Xiaomi, and Huawei affected by zero-day flaw that... by jumpingmice on Saturday October 05, 2019 @09:23PM (#21169196)
Yeah that’s the rumor but allocations of any size can fail when kmem cgroup accounting is enabled and the container is out of space.
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Re:Google, Xiaomi, and Huawei affected by zero-day flaw that... by jnurmine on Sunday October 06, 2019 @09:32AM (#21171905)
Well, if the allocation is done with GFP_ACCOUNT bit set, i.e. kmemcg accounting enabled, isn't that the intended behaviour that the allocation can fail?
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Re:Google, Xiaomi, and Huawei affected by zero-day flaw that... by jumpingmice on Sunday October 06, 2019 @12:13PM (#21172891)
Yes that is the point. In the relatively rare case of failure this particular function uses a goto to return without releasing a held mutex. Error paths within the kernel are a rich vein of malfunction.
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