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Test user.* extended attribute operations on path-based Unix domain sockets (SOCK_STREAM, SOCK_DGRAM, SOCK_SEQPACKET). Path-based sockets are bound to a filesystem path and their inodes live on the underlying filesystem (e.g. tmpfs). Covers set/get/list/remove, persistence, XATTR_CREATE/XATTR_REPLACE flags, empty values, size queries, buffer-too-small errors, O_PATH fd operations, and trusted.* xattr handling. Link: https://patch.msgid.link/20260216-work-xattr-socket-v1-12-c2efa4f74cb7@kernel.org Acked-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Jan Kara <jack@suse.cz> Signed-off-by: Christian Brauner <brauner@kernel.org>