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Filename : sysc_seccomp.stp
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# seccomp ____________________________________________________
# long sys_seccomp(unsigned int op, unsigned int flags, const char __user* uargs)

@define _SYSCALL_SECCOMP_NAME
%(
	name = "seccomp"
%)

@define _SYSCALL_SECCOMP_ARGSTR
%(
	argstr = sprintf("%s, %s, %p", op_str, flags_str, uargs_uaddr)
%)

@define _SYSCALL_SECCOMP_REGARGS
%(
	op = uint_arg(1)
	op_str = _seccomp_op_str(op)
	flags = uint_arg(2)
	flags_str = _seccomp_flags_str(flags)
%( systemtap_v <= "2.9" %?
	uargs = user_string_quoted(pointer_arg(3))
%)
	uargs_uaddr = pointer_arg(3)
%)

probe syscall.seccomp = dw_syscall.seccomp !, nd_syscall.seccomp ? {}
probe syscall.seccomp.return = dw_syscall.seccomp.return !,
                               nd_syscall.seccomp.return ? {}

# dw_seccomp _____________________________________________________

probe dw_syscall.seccomp = kernel.function("sys_seccomp").call ?
{
	@_SYSCALL_SECCOMP_NAME
	op = $op
	op_str = _seccomp_op_str(op)
	flags = $flags
	flags_str = _seccomp_flags_str(flags)
%( systemtap_v <= "2.9" %?
	uargs = user_string_quoted($uargs)
%)
	uargs_uaddr = $uargs
	@_SYSCALL_SECCOMP_ARGSTR
}
probe dw_syscall.seccomp.return = kernel.function("sys_seccomp").return ?
{
	@_SYSCALL_SECCOMP_NAME
	@SYSC_RETVALSTR($return)
}

# nd_seccomp _____________________________________________________

probe nd_syscall.seccomp = nd1_syscall.seccomp!, nd2_syscall.seccomp!, tp_syscall.seccomp
  { }

probe nd1_syscall.seccomp = kprobe.function("sys_seccomp") ?
{
	@_SYSCALL_SECCOMP_NAME
	asmlinkage()
	@_SYSCALL_SECCOMP_REGARGS
	@_SYSCALL_SECCOMP_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.seccomp = kprobe.function(@arch_syscall_prefix "sys_seccomp") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_SECCOMP_NAME
	@_SYSCALL_SECCOMP_REGARGS
	@_SYSCALL_SECCOMP_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.seccomp = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_seccomp"), @const("__NR_compat_seccomp"))
	@_SYSCALL_SECCOMP_NAME
	@_SYSCALL_SECCOMP_REGARGS
	@_SYSCALL_SECCOMP_ARGSTR
}

probe nd_syscall.seccomp.return = nd1_syscall.seccomp.return!, nd2_syscall.seccomp.return!, tp_syscall.seccomp.return
  { }
  
probe nd1_syscall.seccomp.return = kprobe.function("sys_seccomp").return ?
{
	@_SYSCALL_SECCOMP_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 4.17+ */
probe nd2_syscall.seccomp.return = kprobe.function(@arch_syscall_prefix "sys_seccomp").return ?
{
	@_SYSCALL_SECCOMP_NAME
	@SYSC_RETVALSTR(returnval())
}
 
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.seccomp.return = kernel.trace("sys_exit")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_seccomp"), @const("__NR_compat_seccomp"))
	@_SYSCALL_SECCOMP_NAME
	@SYSC_RETVALSTR($ret)
}