Re: [PATCH 1/2] HID: bpf: enforce HID_BPF dependencies

From: Jon Hunter
Date: Thu Dec 01 2022 - 08:13:20 EST



On 30/11/2022 10:10, Benjamin Tissoires wrote:
As mentioned in the link below, having JIT and BPF is not enough to
have fmod_ret and error injection 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@xxxxxxxxxxxxxx
Fixes: f5c27da4e3c8 ("HID: initial BPF implementation")
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx>
---
drivers/hid/bpf/Kconfig | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/hid/bpf/Kconfig b/drivers/hid/bpf/Kconfig
index 298634fc3335..498232f9faa9 100644
--- a/drivers/hid/bpf/Kconfig
+++ b/drivers/hid/bpf/Kconfig
@@ -4,7 +4,9 @@ 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 && \
+ FUNCTION_ERROR_INJECTION
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


This fixes it for me!

Tested-by: Jon Hunter <jonathanh@xxxxxxxxxx>

Thanks!
Jon

--
nvpublic