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bpf: Fix iter/task tid filtering

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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
This commit is contained in:
Jordan Rome 2024-10-16 14:00:47 -07:00 committed by Andrii Nakryiko
parent e59db0623f
commit 9495a5b731
1 changed files with 1 additions and 1 deletions
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2
kernel/bpf/task_iter.c
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@ -99,7 +99,7 @@ static struct task_struct *task_seq_get_next(struct bpf_iter_seq_task_common *co
rcu_read_lock(); rcu_read_lock();
pid = find_pid_ns(common->pid, common->ns); pid = find_pid_ns(common->pid, common->ns);
if (pid) { if (pid) {
task = get_pid_task(pid, PIDTYPE_TGID); task = get_pid_task(pid, PIDTYPE_PID);
*tid = common->pid; *tid = common->pid;
} }
rcu_read_unlock(); rcu_read_unlock();