Hello, I tried to use: call_usermodehelper It worked fine with <https://github.com/smalinux/Kernel-hacking-101/blob/master/invoke-userlevel-...> /sbin/shutdown and /bin/touch but with /bin/firefox i got kernel oops: Any clarification, thanks [ 2258.760627] invoke_userlevel_app: module verification failed: signature
and/or required key missing - tainting kernel [ 2258.918529] do_init_module: 'invoke_userlevel_app'->init suspiciously returned 256, it should follow 0/-E convention do_init_module: loading module anyway... [ 2258.918543] CPU: 1 PID: 4454 Comm: insmod Tainted: G OE 5.9.0-11953-g7cf726a59435 #2 [ 2258.918544] Hardware name: Hewlett-Packard HP ProBook 450 G1/1942, BIOS L74 Ver. 01.07 01/24/2014 [ 2258.918545] Call Trace: [ 2258.918554] dump_stack+0x6b/0x83 [ 2258.918559] do_init_module.cold+0x21/0x26 [ 2258.918563] __do_sys_finit_module+0x98/0xe0 [ 2258.918566] do_syscall_64+0x33/0x40 [ 2258.918568] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 2258.918570] RIP: 0033:0x7f39f031837d [ 2258.918572] Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d eb 6a 0c 00 f7 d8 64 89 01 48 [ 2258.918573] RSP: 002b:00007ffd4a6b4bf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 2258.918576] RAX: ffffffffffffffda RBX: 0000562b8cc9c800 RCX: 00007f39f031837d [ 2258.918577] RDX: 0000000000000000 RSI: 0000562b8be25288 RDI: 0000000000000003 [ 2258.918577] RBP: 0000000000000000 R08: 0000000000000000 R09: 00007f39f03e34a0 [ 2258.918578] R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000000 [ 2258.918579] R13: 0000562b8be25288 R14: 0000562b8cc9f040 R15: 00007ffd4a6b4da8