Commits on Nov 6, 2023

1. mountinfo: linux: add a /proc/self/mountinfo fallback …

   In very specific cases (that we hit in runc), it is possible to be
   running in a child pid namespace (where the Go process's pid is 1) but
   still have a host /proc. While this is not a problem with
   /proc/thread-self (since the process *is* in the host pid namespace),
   the /proc/self/task/<tid> fallback doesn't work because gettid(2)
   returns the wrong thread-id for the host pid namespace.
   
   There isn't much we can do in this case other than use /proc/self,
   because the simple workarounds (grep NSpid /proc/self/task/*/status)
   aren't available in pre-3.17 kernels and any more complicated schemes
   (such as setting the signal mask to something unique and scanning for
   it) are unworkable for obvious reasons.
   
   Fixes: 12c61a3 ("mountinfo: linux: use /proc/thread-self/mountinfo")
   Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>

   

   cyphar committed Nov 6, 2023
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