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When /dev/hidraw* devices are not accessible, liblinphone crashes in HidDevice::stopPollTimer(). This adds a stub hidapi implementation that returns empty device lists, preventing the crash while disabling USB headset button support. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com> |
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| hidapi_dummy.c | ||
| README.md | ||
HID Crash Fix for Linphone
Problem
Linphone crashes on startup with SIGSEGV in LinphonePrivate::HidDevice::stopPollTimer() when the user has no read access to /dev/hidraw* devices.
Root Cause
The liblinphone SDK's HID subsystem (for USB headset button support) does not handle permission errors gracefully. When hid_enumerate() fails or returns devices that cannot be opened, the subsequent timer handling crashes.
Solution
Replace libhidapi-hidraw.so.0.15.0 inside the AppImage with a stub implementation that:
- Returns empty device lists from
hid_enumerate() - Returns NULL from all
hid_open*()functions - Returns safe error values from all other operations
This disables USB headset button support but prevents the crash.
Build
gcc -shared -fPIC -O2 -Wall -Wextra -Wpedantic -std=c11 \
-o libhidapi-hidraw.so.0.15.0 hidapi_dummy.c
Integration into AppImage
# Extract
./Linphone-*.AppImage --appimage-extract
# Replace library
cp libhidapi-hidraw.so.0.15.0 squashfs-root/lib/
# Repackage
ARCH=x86_64 appimagetool squashfs-root Linphone-Fixed.AppImage
Alternative: System-wide Fix
Instead of patching the AppImage, grant HID access to users:
echo 'KERNEL=="hidraw*", TAG+="uaccess", MODE="0666"' | \
sudo tee /etc/udev/rules.d/99-hidraw-permissions.rules
sudo udevadm control --reload-rules && sudo udevadm trigger
Files
hidapi_dummy.c- Complete HIDAPI 0.15.0 stub implementation (25 functions)