| Server IP : 195.134.90.114 / Your IP : 216.73.216.87 Web Server : Apache/2.4.58 System : Linux nepub 6.8.0-88-generic #89-Ubuntu SMP PREEMPT_DYNAMIC Sat Oct 11 01:02:46 UTC 2025 x86_64 User : www-data ( 33) PHP Version : 8.2.30 Disable Function : NONE MySQL : OFF | cURL : ON | WGET : ON | Perl : ON | Python : OFF | Sudo : ON | Pkexec : OFF Directory : /usr/share/doc/bpftrace/examples/ |
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Demonstrations of capable, the Linux bpftrace/eBPF version. capable traces calls to the kernel cap_capable() function, which does security capability checks, and prints details for each call. For example: # ./capable.bt TIME UID PID COMM CAP NAME AUDIT 22:11:23 114 2676 snmpd 12 CAP_NET_ADMIN 1 22:11:23 0 6990 run 24 CAP_SYS_RESOURCE 1 22:11:23 0 7003 chmod 3 CAP_FOWNER 1 22:11:23 0 7003 chmod 4 CAP_FSETID 1 22:11:23 0 7005 chmod 4 CAP_FSETID 1 22:11:23 0 7005 chmod 4 CAP_FSETID 1 22:11:23 0 7006 chown 4 CAP_FSETID 1 22:11:23 0 7006 chown 4 CAP_FSETID 1 22:11:23 0 6990 setuidgid 6 CAP_SETGID 1 22:11:23 0 6990 setuidgid 6 CAP_SETGID 1 22:11:23 0 6990 setuidgid 7 CAP_SETUID 1 22:11:24 0 7013 run 24 CAP_SYS_RESOURCE 1 22:11:24 0 7026 chmod 3 CAP_FOWNER 1 22:11:24 0 7026 chmod 4 CAP_FSETID 1 22:11:24 0 7028 chmod 4 CAP_FSETID 1 22:11:24 0 7028 chmod 4 CAP_FSETID 1 22:11:24 0 7029 chown 4 CAP_FSETID 1 22:11:24 0 7029 chown 4 CAP_FSETID 1 22:11:24 0 7013 setuidgid 6 CAP_SETGID 1 22:11:24 0 7013 setuidgid 6 CAP_SETGID 1 22:11:24 0 7013 setuidgid 7 CAP_SETUID 1 22:11:25 0 7036 run 24 CAP_SYS_RESOURCE 1 22:11:25 0 7049 chmod 3 CAP_FOWNER 1 22:11:25 0 7049 chmod 4 CAP_FSETID 1 22:11:25 0 7051 chmod 4 CAP_FSETID 1 22:11:25 0 7051 chmod 4 CAP_FSETID 1 [...] This can be useful for general debugging, and also security enforcement: determining a whitelist of capabilities an application needs. The output above includes various capability checks: snmpd checking CAP_NET_ADMIN, run checking CAP_SYS_RESOURCES, then some short-lived processes checking CAP_FOWNER, CAP_FSETID, etc. To see what each of these capabilities does, check the capabilities(7) man page and the kernel source. There is another version of this tool in bcc: https://github.com/iovisor/bcc The bcc version provides options to customize the output.