This is a note to let you know that I've just added the patch titled
bpf: Fix iter/task tid filtering
to the 6.11-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
bpf-fix-iter-task-tid-filtering.patch
and it can be found in the queue-6.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 044684dcd5a3998c97542b44eff2a8226b9b1a03
Author: Jordan Rome <linux@xxxxxxxxxxxxxx>
Date: Wed Oct 16 14:00:47 2024 -0700
bpf: Fix iter/task tid filtering
[ Upstream commit 9495a5b731fcaf580448a3438d63601c88367661 ]
In userspace, you can add a tid filter by setting
the "task.tid" field for "bpf_iter_link_info".
However, `get_pid_task` when called for the
`BPF_TASK_ITER_TID` type should have been using
`PIDTYPE_PID` (tid) instead of `PIDTYPE_TGID` (pid).
Fixes: f0d74c4da1f0 ("bpf: Parameterize task iterators.")
Signed-off-by: Jordan Rome <linux@xxxxxxxxxxxxxx>
Signed-off-by: Andrii Nakryiko <andrii@xxxxxxxxxx>
Link: https://lore.kernel.org/bpf/20241016210048.1213935-1-linux@xxxxxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/kernel/bpf/task_iter.c b/kernel/bpf/task_iter.c
index 02aa9db8d7961..5af9e130e500f 100644
--- a/kernel/bpf/task_iter.c
+++ b/kernel/bpf/task_iter.c
@@ -99,7 +99,7 @@ static struct task_struct *task_seq_get_next(struct bpf_iter_seq_task_common *co
rcu_read_lock();
pid = find_pid_ns(common->pid, common->ns);
if (pid) {
- task = get_pid_task(pid, PIDTYPE_TGID);
+ task = get_pid_task(pid, PIDTYPE_PID);
*tid = common->pid;
}
rcu_read_unlock();
