libct: fix shared pidns detection#3865
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When someone is using libcontainer to start and kill containers from a long lived process (i.e. the same process creates and removes the container), initProcess.wait method is used, which has a kludge to work around killing containers that do not have their own PID namespace. The code that checks for own PID namespace is not entirely correct. To be exact, it does not set sharePidns flag when the host/caller PID namespace is implicitly used. As a result, the above mentioned kludge does not work. Fix this, and provide a test case (which is checked to fail before the fix). Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
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I'm going to convert this to an issue, and merge the fix to #3825. |
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Filed #3866 |
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Found while working on #3825.
When someone is using libcontainer to start and kill containers from a long lived process (i.e. the same process creates and removes the container), initProcess.wait method is used, which has a kludge to work around killing containers that do not have their own PID namespace.
The code that checks for own PID namespace is not entirely correct. To be exact, it does not set sharePidns flag when the host/caller PID namespace is implicitly used. As a result, the above mentioned kludge does not work.
Fix this, and provide a test case. The test is checked to fail before the fix: