Arch Linux

Description:

AppArmor on LTS seems to behave differently than non-LTS kernels. Running the following script (https://gist.github.com/bboozzoo/840cdbd066ab81ca438fab6b0b75ea1b) I get an error:

```
david@bar:/tmp/apparmor_test$ gcc a.c -lapparmor
david@bar:/tmp/apparmor_test$ ls
a.c a.out
david@bar:/tmp/apparmor_test$ ./a.out
aa_getcon: Invalid argument
1 david@bar:/tmp/apparmor_test$ uname -a
Linux bar 5.4.82-1-lts #1 SMP Tue, 08 Dec 2020 12:10:59 +0000 x86_64 GNU/Linux
```

Script:

```
// gcc -lapparmor
#include <sys/apparmor.h>
#include <stdio.h>
#include <stdlib.h>

int main(int argc, char *argv[])
{
char *label, *mode = NULL;
if (aa_getcon(&label, &mode) == -1) {
perror("aa_getcon");
exit(EXIT_FAILURE);
}
printf("label: %s\nmode: %s\n", label, mode);
free(label);
free(mode);
return 0;
}
```

I'm not sure the reason for this, but it is causing some of my custom application to fail on LTS.


Steps to reproduce:

1. Install LTS
2. Setup AppArmor
3. Try to run the aa_getcon function as shown in the gist: https://gist.github.com/bboozzoo/840cdbd066ab81ca438fab6b0b75ea1b