again, don't really understand... On 08/21, Suren Baghdasaryan wrote: > > Actually, reviewing again and considering where list_add_tail_rcu is > happening, maybe the race with clone(CLONE_VM) does not introduce > false negatives.
I think it does... Whatever we check, mm_users or MMF_PROC_SHARED, the task can do clone(CLONE_VM) right after the check. > However a false negative I think will happen when a > task shares mm with another task and also has an additional thread. > Shared mm will increment mm_users without adding to signal->live Yes, > and > the additional thread will advance signal->live without adding to > mm_users. No, please note that CLONE_THREAD requires CLONE_VM. Oleg.
