netdev - [PATCH bpf-next] bpf: Allow bpf_current_task_under

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20180428073235.3917719-1-qinteng@fb.com>
Date:   Sat, 28 Apr 2018 00:32:35 -0700
From:   Teng Qin <qinteng@...com>
To:     <netdev@...r.kernel.org>
CC:     <ast@...nel.org>, <daniel@...earbox.net>, <yhs@...com>,
        <kernel-team@...com>, Teng Qin <qinteng@...com>
Subject: [PATCH bpf-next] bpf: Allow bpf_current_task_under_cgroup in interrupt

Currently, the bpf_current_task_under_cgroup helper has a check where if
the BPF program is running in_interrupt(), it will return -EINVAL. This
prevents the helper to be used in many useful scenarios, particularly
BPF programs attached to Perf Events.

This commit removes the check. Tested a few NMI (Perf Event) and some
softirq context, the helper returns the correct result.
---
 kernel/trace/bpf_trace.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index 56ba0f2..f94890c 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -474,8 +474,6 @@ BPF_CALL_2(bpf_current_task_under_cgroup, struct bpf_map *, map, u32, idx)
 	struct bpf_array *array = container_of(map, struct bpf_array, map);
 	struct cgroup *cgrp;
 
-	if (unlikely(in_interrupt()))
-		return -EINVAL;
 	if (unlikely(idx >= array->map.max_entries))
 		return -E2BIG;
 
-- 
2.9.5