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authorOleg Nesterov <oleg@redhat.com>2017-08-21 17:35:02 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2017-08-21 12:47:31 -0700
commitdd1c1f2f2028a7b851f701fc6a8ebe39dcb95e7c (patch)
tree96b5e5466504cc8c88b0f0435e80f70f0c627c58 /tools
parent14ccee78fc82f5512908f4424f541549a5705b89 (diff)
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pids: make task_tgid_nr_ns() safe
This was reported many times, and this was even mentioned in commit 52ee2dfdd4f5 ("pids: refactor vnr/nr_ns helpers to make them safe") but somehow nobody bothered to fix the obvious problem: task_tgid_nr_ns() is not safe because task->group_leader points to nowhere after the exiting task passes exit_notify(), rcu_read_lock() can not help. We really need to change __unhash_process() to nullify group_leader, parent, and real_parent, but this needs some cleanups. Until then we can turn task_tgid_nr_ns() into another user of __task_pid_nr_ns() and fix the problem. Reported-by: Troy Kensinger <tkensinger@google.com> Signed-off-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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