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When attaching to systemd units with ProtectProc=invisible, /proc/sys/kernel/cap_last_cap is not accessible from within the namespace. This caused cntr to fail with "No such file or directory" errors. Fix by reading cap_last_cap in the host namespace (in procfs::status()) before transitioning into the target namespace. The value is stored in ProcStatus and passed to capabilities::drop() when needed. Fixes: #606
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When attaching to systemd units with ProtectProc=invisible, /proc/sys/kernel/cap_last_cap is not accessible from within the namespace. This caused cntr to fail with "No such file or directory" errors.
Fix by reading cap_last_cap in the host namespace (in procfs::status()) before transitioning into the target namespace. The value is stored in ProcStatus and passed to capabilities::drop() when needed.
Fixes: #606