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UPSTREAM: bpf: Ensure correct locking around vulnerable function find_vpid()

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[ Upstream commit 83c10cc362 ]

The documentation for find_vpid() clearly states:

  "Must be called with the tasklist_lock or rcu_read_lock() held."

Presently we do neither for find_vpid() instance in bpf_task_fd_query().
Add proper rcu_read_lock/unlock() to fix the issue.

Bug: 232939090
Fixes: 41bdc4b40e ("bpf: introduce bpf subcommand BPF_TASK_FD_QUERY")
Signed-off-by: Lee Jones <lee@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20220912133855.1218900-1-lee@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Lee Jones <joneslee@google.com>
Change-Id: I517b52d97a22b92be1a479279067ddb7b84efbba
This commit is contained in:
Lee Jones
2022-09-12 14:38:55 +01:00
committed by Treehugger Robot
parent 01b3d953ac
commit 98671fcc32
1 changed files with 2 additions and 0 deletions
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2
kernel/bpf/syscall.c
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@@ -3917,7 +3917,9 @@ static int bpf_task_fd_query(const union bpf_attr *attr,
if (attr->task_fd_query.flags != 0)
return -EINVAL;
rcu_read_lock();
task = get_pid_task(find_vpid(pid), PIDTYPE_PID);
rcu_read_unlock();
if (!task)
return -ENOENT;