netdev - [PATCH HID for-next v3 3/5] HID: bpf: enforce HID

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Date:   Tue,  6 Dec 2022 15:59:34 +0100
From:   Benjamin Tissoires <benjamin.tissoires@...hat.com>
To:     Jiri Kosina <jikos@...nel.org>,
        Florent Revest <revest@...omium.org>,
        Jon Hunter <jonathanh@...dia.com>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>
Subject: [PATCH HID for-next v3 3/5] HID: bpf: enforce HID_BPF dependencies

As mentioned in the link below, having JIT and BPF is not enough to
have fentry/fexit/fmod_ret APIs. This resolves the error that
happens on a system without tracing enabled when hid-bpf tries to
load itself.

Link: https://lore.kernel.org/r/CABRcYmKyRchQhabi1Vd9RcMQFCcb=EtWyEbFDFRTc-L-U8WhgA@mail.gmail.com
Fixes: f5c27da4e3c8 ("HID: initial BPF implementation")
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>

---

no changes in v3

changes in v2:
- dropped ALLOW_ERROR_INJECTION requirement
---
 drivers/hid/bpf/Kconfig | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/hid/bpf/Kconfig b/drivers/hid/bpf/Kconfig
index 298634fc3335..03f52145b83b 100644
--- a/drivers/hid/bpf/Kconfig
+++ b/drivers/hid/bpf/Kconfig
@@ -4,7 +4,8 @@ menu "HID-BPF support"
 config HID_BPF
 	bool "HID-BPF support"
 	default HID_SUPPORT
-	depends on BPF && BPF_SYSCALL
+	depends on BPF && BPF_SYSCALL && \
+		   DYNAMIC_FTRACE_WITH_DIRECT_CALLS
 	help
 	This option allows to support eBPF programs on the HID subsystem.
 	eBPF programs can fix HID devices in a lighter way than a full
-- 
2.38.1