totoro
2fa149f2c4
A newly created network namespace may disallow ICMP echo sockets for unprivileged users even when their GIDs are mapped into the container. When creating both user and network namespaces, initialize net.ipv4.ping_group_range using the mapped GID range capped at INT32_MAX. This follows the system-wide default from sysctl.d/50-default.conf while respecting the user namespace mapping and the kernel's accepted limit. Leave externally supplied network namespaces untouched and treat write failures as non-fatal warnings. Add regression coverage for the default 64K mapped range using the tools already available in the minimal container image. Fixes #41603
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