selftests/xattr: test xattrs on various socket families

Test user.* xattr operations on sockets from different address families:
AF_INET, AF_INET6, AF_NETLINK, and AF_PACKET. All socket types use
so

selftests/xattr: test xattrs on various socket families

Test user.* xattr operations on sockets from different address families:
AF_INET, AF_INET6, AF_NETLINK, and AF_PACKET. All socket types use
sockfs for their inodes, so user.* xattrs should work regardless of
address family.

Each fixture creates a socket (no bind needed) and verifies the full
fsetxattr/fgetxattr/flistxattr/fremovexattr cycle. AF_INET6 skips if
not supported; AF_PACKET skips if CAP_NET_RAW is unavailable.

Also tests abstract namespace AF_UNIX sockets, which live in sockfs
(not on a filesystem) and should support user.* xattrs.

Link: https://patch.msgid.link/20260216-work-xattr-socket-v1-14-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>

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selftests/xattr: sockfs socket xattr tests

Test user.* extended attribute operations on sockfs sockets. Sockets
created via socket() have their inodes in sockfs, which now supports
user.* xattrs wit

selftests/xattr: sockfs socket xattr tests

Test user.* extended attribute operations on sockfs sockets. Sockets
created via socket() have their inodes in sockfs, which now supports
user.* xattrs with per-inode limits.

Tests fsetxattr/fgetxattr/flistxattr/fremovexattr operations including
set/get, listing (verifies system.sockprotoname presence), remove,
update, XATTR_CREATE/XATTR_REPLACE flags, empty values, size queries,
and buffer-too-small errors.

Also tests per-inode limit enforcement: maximum 128 xattrs, maximum
128KB total value size, limit recovery after removal, and independent
limits across different sockets.

Link: https://patch.msgid.link/20260216-work-xattr-socket-v1-13-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>

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selftests/xattr: path-based AF_UNIX socket xattr tests

Test user.* extended attribute operations on path-based Unix domain
sockets (SOCK_STREAM, SOCK_DGRAM, SOCK_SEQPACKET). Path-based sockets
are b

selftests/xattr: path-based AF_UNIX socket xattr tests

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>

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