pkg/docker-engine: rpm: Ship SELinux policy denying AF_ALG sockets#449
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Ship a CIL policy module that denies AF_ALG socket creation for all container domains (container_t, spc_t). Like AppArmor, SELinux hooks into the kernel's security_socket_create() LSM callback, which fires regardless of whether the socket was created via socket(2) or the legacy socketcall(2) multiplexer. This blocks AF_ALG selectively without disrupting other socketcall usage by 32-bit binaries. This complements the seccomp profile change in moby, which blocks socket(AF_ALG) but cannot filter socketcall arguments. On SELinux-only systems (Fedora, RHEL, CentOS) where AppArmor is not available, this CIL module provides equivalent protection. Load the module from %post when SELinux is enabled, warning but keeping installation non-fatal if semodule cannot load it. Remove the module on uninstall. Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com> Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
vvoland
approved these changes
Jun 11, 2026
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Ship a CIL policy module that denies AF_ALG socket creation for all container domains (container_t, spc_t). Like AppArmor, SELinux hooks into the kernel's security_socket_create() LSM callback, which fires regardless of whether the socket was created via socket(2) or the legacy socketcall(2) multiplexer. This blocks AF_ALG selectively without disrupting other socketcall usage by 32-bit binaries.
This complements the seccomp profile change in moby, which blocks socket(AF_ALG) but cannot filter socketcall arguments.
On SELinux-only systems (Fedora, RHEL, CentOS) where AppArmor is not available, this CIL module provides equivalent protection.
Load the module from %post when SELinux is enabled, warning but keeping installation non-fatal if semodule cannot load it. Remove the module on uninstall.