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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: f0d74c4da1 ("bpf: Parameterize task iterators.")
Signed-off-by: Jordan Rome <linux@jordanrome.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20241016210048.1213935-1-linux@jordanrome.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jordan Rome 2024-10-16 14:00:47 -07:00 committed by Greg Kroah-Hartman
parent 4ed32cc093
commit bb0f943675
1 changed files with 1 additions and 1 deletions
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2
kernel/bpf/task_iter.c
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@ -119,7 +119,7 @@ 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();