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[bpf,v2,1/2] bpf: Fix iter/task tid filtering

Message ID 20241016210048.1213935-1-linux@jordanrome.com (mailing list archive)
State Accepted
Commit 9495a5b731fcaf580448a3438d63601c88367661
Delegated to: BPF
Headers show
Series [bpf,v2,1/2] bpf: Fix iter/task tid filtering | expand

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Commit Message

Jordan Rome Oct. 16, 2024, 9 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

patchwork-bot+netdevbpf@kernel.org Oct. 17, 2024, 6:10 p.m. UTC | #1 
Hello:

This series was applied to bpf/bpf.git (master)
by Andrii Nakryiko <andrii@kernel.org>:

On Wed, 16 Oct 2024 14:00:47 -0700 you 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>
> 
> [...]

Here is the summary with links:
  - [bpf,v2,1/2] bpf: Fix iter/task tid filtering
    https://git.kernel.org/bpf/bpf/c/9495a5b731fc
  - [bpf,v2,2/2] bpf: properly test iter/task tid filtering
    https://git.kernel.org/bpf/bpf/c/ee8c7c6c3f8c

You are awesome, thank you!
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();