Invoke Firefox from kernel space

Invoke Firefox from kernel space

[Sohaib Mhmd]

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Hello,

I tried to use: call_usermodehelper
It worked fine with
<https://github.com/smalinux/Kernel-hacking-101/blob/master/invoke-userlevel-app.c>
/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
>

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Re: Invoke Firefox from kernel space

[Greg KH]

On Fri, Oct 23, 2020 at 01:35:53AM +0200, Sohaib Mhmd wrote:
> Hello,
> 
> I tried to use: call_usermodehelper
> It worked fine with
> <https://github.com/smalinux/Kernel-hacking-101/blob/master/invoke-userlevel-app.c>
> /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...

The kernel module you wrote is not handling errors properly, why ignore
the kernel's messages here?

And how can the kernel invoke a graphical program?  Please look up how
these types of programs work to see that the kernel can not directly
call them, sorry.

good luck!

greg k-h

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