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[bpf-next,v1,1/2] bpf: Fix iter/task tid filtering

Message ID 20241015182707.1746074-1-linux@jordanrome.com (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series [bpf-next,v1,1/2] bpf: Fix iter/task tid filtering | expand

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Commit Message

Jordan Rome Oct. 15, 2024, 6:27 p.m. UTC 
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@jordanrome.com>
---
 kernel/bpf/task_iter.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--
2.43.5

Comments

Andrii Nakryiko Oct. 16, 2024, 8:09 p.m. UTC | #1 
On Tue, Oct 15, 2024 at 11:33 AM Jordan Rome <linux@jordanrome.com> wrote:
>
> 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@jordanrome.com>
> ---
>  kernel/bpf/task_iter.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>

This change is an important fix, so it has to target bpf tree, please
use [PATCH bpf] subject prefix

> diff --git a/kernel/bpf/task_iter.c b/kernel/bpf/task_iter.c
> index 02aa9db8d796..5af9e130e500 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();
> --
> 2.43.5
>
diff mbox series

Patch

diff --git a/kernel/bpf/task_iter.c b/kernel/bpf/task_iter.c
index 02aa9db8d796..5af9e130e500 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();