Legato communication problem - SMACK eating SCM_RIGHTs data?

[svogl]

We’re cross-compiling the Legato framework for a custom ARM board (Toradex i.MX6D, kernel version 4.9) via a yocto sdk.
Everything compiles nicely but the components cannot communicate with one another. I’ve tracked the issue down to unixSocket.c unixSocket_ReceiveMsg, where the MSG_CTRUNC flag is set when a file descriptor is requested.

It seems to work shortly if I drop the security flags on the named pipes in /tmp/legato but this will introduce security holes.

Does anyone have a fix/workaround for this?

[flu]

Hello Simon,

Assumption: this issue is still open on your siden, please tell if not.

You should provide this information:

• Legato version ( e.g. which tag on GitHub - legatoproject/legato-af: Legato Application Framework )
• Linux kernel configuration ( e.g. zcat /proc/config.gz )
• Linux kernel code ( e.g. which tag on linux-toradex.git - Linux kernel for Apalis and Colibri modules )

You should also check Legato fixes related to UNIX-domain sockets:

History for framework/liblegato/linux/unixSocket.c - legatoproject/legato-af

KR.