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# ptrace _____________________________________________________
#
# int sys_ptrace(long request,
#                long pid,
#                long addr,
#                long data)
#

@define _SYSCALL_PTRACE_NAME
%(
	name = "ptrace"
%)

@define _SYSCALL_PTRACE_ARGSTR
%(
	argstr = _ptrace_argstr(request, pid, addr, data)
%)

@define _SYSCALL_PTRACE_REGARGS
%(
	request = long_arg(1)
	pid = int_arg(2)
	addr = ulong_arg(3)
	data = ulong_arg(4)
%)

@define _SYSCALL_PTRACE_REGARGS_STORE
%(
        if (@probewrite(request))
          set_long_arg(1, request)

	if (@probewrite(pid))
	  set_int_arg(2, pid)

	if (@probewrite(addr))
	  set_ulong_arg(3, addr)

	if (@probewrite(data))
	  set_ulong_arg(4, data)
%)

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

# dw_ptrace _____________________________________________________

probe dw_syscall.ptrace = kernel.function("sys_ptrace").call ?,
		kernel.function("compat_sys_ptrace").call ?
{
	@_SYSCALL_PTRACE_NAME
	request = @__compat_ulong($request)
	pid = __int32($pid)
	addr = @__compat_ulong($addr)
	data = @__compat_ulong(@choose_defined($data, $cdata))
	@_SYSCALL_PTRACE_ARGSTR
}
probe dw_syscall.ptrace.return = kernel.function("sys_ptrace").return ?,
	kernel.function("compat_sys_ptrace").return ?
{
	@_SYSCALL_PTRACE_NAME
	@SYSC_RETVALSTR($return)

	geteventmsg_data = _ptrace_return_geteventmsg_data(@entry($request), @entry($data))
	arch_prctl_addr = _ptrace_return_arch_prctl_addr(@entry($request), @entry($addr), @entry($data))
}

# nd_ptrace _____________________________________________________

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

probe nd1_syscall.ptrace = kprobe.function("sys_ptrace") ?,
	kprobe.function("compat_sys_ptrace") ?
{
	@_SYSCALL_PTRACE_NAME
	asmlinkage()
	@_SYSCALL_PTRACE_REGARGS
	@_SYSCALL_PTRACE_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.ptrace = kprobe.function(@arch_syscall_prefix "sys_ptrace") ?,
	kprobe.function(@arch_syscall_prefix "compat_sys_ptrace") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_PTRACE_NAME
	@_SYSCALL_PTRACE_REGARGS
	@_SYSCALL_PTRACE_ARGSTR
},
{
        %( @_IS_SREG_KERNEL %? @_SYSCALL_PTRACE_REGARGS_STORE %)
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.ptrace = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_ptrace"), @const("__NR_compat_ptrace"))
	@_SYSCALL_PTRACE_NAME
	@_SYSCALL_PTRACE_REGARGS
	@_SYSCALL_PTRACE_ARGSTR
},
{
        %( @_IS_SREG_KERNEL %? @_SYSCALL_PTRACE_REGARGS_STORE %)
}

probe nd_syscall.ptrace.return = nd1_syscall.ptrace.return!, nd2_syscall.ptrace.return!, tp_syscall.ptrace.return
  { }
  
probe nd1_syscall.ptrace.return = kprobe.function("sys_ptrace").return ?,
	kprobe.function("compat_sys_ptrace").return ?
{
	@_SYSCALL_PTRACE_NAME
	@SYSC_RETVALSTR(returnval())

	geteventmsg_data = 0
	arch_prctl_addr = 0
}

/* kernel 4.17+ */
probe nd2_syscall.ptrace.return = kprobe.function(@arch_syscall_prefix "sys_ptrace").return ?,
	kprobe.function(@arch_syscall_prefix "compat_sys_ptrace").return ?
{
	@_SYSCALL_PTRACE_NAME
	@SYSC_RETVALSTR(returnval())

	geteventmsg_data = 0
	arch_prctl_addr = 0
}
 
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.ptrace.return = kernel.trace("sys_exit")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_ptrace"), @const("__NR_compat_ptrace"))
	@_SYSCALL_PTRACE_NAME
	@SYSC_RETVALSTR($ret)

	geteventmsg_data = 0
	arch_prctl_addr = 0
}