Commits on Oct 27, 2023

1. mountinfo: linux: use /proc/thread-self/mountinfo …

   In a Go program with many threads, which goroutine is running on the
   thread-group leader thread is not something programs can controls. Thus,
   even if you use runtime.LockOSThread() for threads that have different
   mount namespaces, it's possible that /proc/self will refer to the
   "wrong" thread.
   
   The solution is to simply use /proc/thread-self, which will always
   provide the correct result for the calling thread. For pre-3.17 kernels
   we use /proc/self/task/<tid> as a fallback.
   
   The usage of /proc/self/mountinfo caused isuses for a patch to runc
   which creates a thread to create id-mapped mounts (which requires
   joining the container mount namespace).
   
   Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>

   

   cyphar committed Oct 27, 2023
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