Song Liu 535b070f4a
bpf: Introduce bpf_cgroup_read_xattr to read xattr of cgroup's node ...
BPF programs, such as LSM and sched_ext, would benefit from tags on
cgroups. One common practice to apply such tags is to set xattrs on
cgroupfs folders.
Introduce kfunc bpf_cgroup_read_xattr, which allows reading cgroup's
xattr.
Note that, we already have bpf_get_[file|dentry]_xattr. However, these
two APIs are not ideal for reading cgroupfs xattrs, because:
1) These two APIs only works in sleepable contexts;
2) There is no kfunc that matches current cgroup to cgroupfs dentry.
bpf_cgroup_read_xattr is generic and can be useful for many program
types. It is also safe, because it requires trusted or rcu protected
argument (KF_RCU). Therefore, we make it available to all program types.
Signed-off-by: Song Liu <song@kernel.org >
Link: https://lore.kernel.org/20250623063854.1896364-3-song@kernel.org
Acked-by: Tejun Heo <tj@kernel.org >
Signed-off-by: Christian Brauner <brauner@kernel.org >
2025-06-23 13:03:12 +02:00
2025-06-23 13:03:12 +02:00
2025-06-03 14:12:36 -07:00
2025-06-07 10:05:35 -07:00
2025-04-02 18:17:33 -07:00
2025-05-27 20:09:06 -07:00
2025-04-29 08:27:10 +02:00
2025-05-31 15:44:16 -07:00
2025-06-02 16:00:26 -07:00
2025-04-30 21:53:35 +02:00
2025-05-27 08:15:26 -07:00
2025-05-08 19:49:33 +02:00
2025-05-14 13:16:24 +02:00
2025-06-02 12:24:58 -07:00
2025-06-07 10:05:35 -07:00
2025-05-31 15:44:16 -07:00
2025-03-27 19:22:24 -07:00
2025-06-08 09:07:37 +02:00
2025-06-08 09:07:37 +02:00
2025-06-08 09:07:37 +02:00
2025-06-08 08:19:01 -07:00
2025-02-12 12:24:16 +01:00
2024-04-04 16:24:16 +02:00
2025-04-15 11:32:34 +02:00
2025-04-11 14:14:41 -04:00
2024-10-11 14:34:16 -04:00
2024-12-05 19:22:38 -05:00
2025-03-18 15:34:27 +01:00
2024-06-24 22:24:55 -07:00
2024-04-29 08:29:29 -07:00
2025-03-07 22:03:09 -06:00
2025-03-30 15:44:36 -07:00
2025-03-04 18:44:29 -08:00
2025-05-08 21:50:19 +02:00
2025-02-10 16:56:58 -08:00
2025-05-21 10:48:21 -07:00
2025-05-11 17:54:10 -07:00
2024-12-02 11:25:09 +01:00
2025-05-27 19:40:33 -07:00
2024-02-23 17:48:22 -08:00
2025-05-31 19:12:53 -07:00
2025-05-31 15:44:16 -07:00
2024-10-14 09:14:35 +02:00
2025-03-15 21:22:52 +09:00
2025-05-11 17:54:08 -07:00
2025-02-21 15:05:38 +01:00
2025-01-13 22:40:36 -08:00
2025-03-10 11:54:46 +01:00
2024-07-20 16:33:21 +09:00
2025-01-02 22:12:12 +01:00
2025-02-18 10:16:04 +01:00
2025-02-21 10:25:33 +01:00
2025-02-21 09:20:30 +01:00
2025-05-31 19:12:53 -07:00
2024-11-07 15:25:05 +01:00
2024-12-30 17:59:08 -08:00
2025-04-29 15:54:53 -04:00
2025-03-16 22:30:47 -07:00
2025-05-31 19:12:53 -07:00
2025-05-12 23:50:40 -07:00
2025-05-12 23:50:40 -07:00
2024-04-23 14:59:01 +10:00
2024-12-24 09:46:49 +01:00
2025-03-10 11:54:46 +01:00
2025-01-07 16:59:15 +01:00
2025-06-08 09:07:37 +02:00
2025-01-28 13:48:37 +01:00
2025-05-31 19:12:53 -07:00
2024-11-05 17:12:31 -08:00
2025-05-09 13:13:54 +02:00
2025-05-19 13:44:16 +08:00
2025-05-31 19:12:53 -07:00
2025-05-07 20:24:59 +02:00
2025-03-06 10:18:36 +01:00
2025-01-28 13:48:37 +01:00
2025-05-06 13:59:00 +02:00
2024-08-04 13:36:28 -07:00
2025-05-11 17:48:15 -07:00
2025-04-01 10:06:52 -07:00
2024-04-25 21:07:03 -07:00
2025-05-11 17:54:09 -07:00
2024-10-09 12:47:19 -07:00
2025-03-21 22:10:05 -07:00
2025-03-06 22:26:49 +01:00
2024-11-14 16:09:51 -08:00
2025-02-24 11:17:10 -08:00
2025-04-09 13:32:16 +02:00
2025-01-28 11:34:03 -08:00
2025-03-25 10:46:44 +01:00
2025-01-28 13:48:37 +01:00
2025-03-30 15:44:36 -07:00
2025-03-11 10:15:52 -07:00
2024-07-18 12:19:20 -07:00
2025-05-03 12:02:07 +02:00
2025-04-14 14:13:41 +02:00
2025-04-09 13:32:16 +02:00
2025-01-13 22:40:36 -08:00
2024-11-03 01:28:06 -05:00
2025-02-05 07:14:24 -08:00
2025-03-21 15:30:10 -04:00
2024-07-12 16:39:53 -07:00
2025-03-16 22:30:50 -07:00
2025-01-28 13:48:37 +01:00
2025-02-12 12:12:27 +01:00
2024-09-12 12:16:09 +02:00
2025-01-28 13:48:37 +01:00
2025-04-18 10:08:11 -04:00
2025-05-11 17:54:04 -07:00
2025-03-24 09:52:37 -07:00
2025-04-01 10:06:52 -07:00
2025-05-21 10:48:22 -07:00
2025-06-08 09:07:37 +02:00
535b070f4a