^^&&^^

Edit File: sysc_sigaction.stp

# sigaction __________________________________________________
# sys_sigaction(int sig, const struct old_sigaction __user *act, struct old_sigaction __user *oact)
# sys32_sigaction(int sig, struct old_sigaction32 __user *act, struct old_sigaction32 __user *oact)
#

@define _SYSCALL_SIGACTION_NAME
%(
	name = "sigaction"
%)

@define _SYSCALL_SIGACTION_ARGSTR
%(
	argstr = sprintf("%s, {%s}, %p", sig_str, act_str, oact_uaddr)
%)

@define _SYSCALL_SIGACTION_REGARGS
%(
	sig = int_arg(1)
	sig_str = _signal_name(sig)
	act_uaddr = pointer_arg(2)
	act_str = _struct_sigaction_u(act_uaddr)
	oact_uaddr = pointer_arg(3)
%)

@define _SYSCALL_SIGACTION32_REGARGS
%(
	sig = int_arg(1)
	sig_str = _signal_name(sig)
	act_uaddr = pointer_arg(2)
	act_str = _struct_old_sigaction32_u(act_uaddr)
	oact_uaddr = pointer_arg(3)
%)

probe syscall.sigaction32 = dw_syscall.sigaction32 !, nd_syscall.sigaction32 ? {}

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

# dw_sigaction _____________________________________________________

probe dw_syscall.sigaction = kernel.function("sys_sigaction").call ?
{
	@_SYSCALL_SIGACTION_NAME
	sig = __int32($sig)
	sig_str = _signal_name(sig)
	act_uaddr = @__pointer($act)
	act_str = _struct_sigaction_u(act_uaddr)
	oact_uaddr = $oact
	@_SYSCALL_SIGACTION_ARGSTR
}
probe dw_syscall.sigaction.return = kernel.function("sys_sigaction").return ?
{
	@_SYSCALL_SIGACTION_NAME
	@SYSC_RETVALSTR($return)
}

# nd_sigaction _____________________________________________________

probe nd_syscall.sigaction = nd1_syscall.sigaction!, tp_syscall.sigaction
  { }

probe nd1_syscall.sigaction = kprobe.function("sys_sigaction") ?
{
	@_SYSCALL_SIGACTION_NAME
	%( arch != "powerpc" %? asmlinkage() %)
	@_SYSCALL_SIGACTION_REGARGS
	@_SYSCALL_SIGACTION_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.sigaction = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_gate(@const("__NR_sigaction"))
	@_SYSCALL_SIGACTION_NAME
	@_SYSCALL_SIGACTION_REGARGS
	@_SYSCALL_SIGACTION_ARGSTR
}

probe nd_syscall.sigaction.return = nd1_syscall.sigaction.return!, tp_syscall.sigaction.return
  { }

probe nd1_syscall.sigaction.return = kprobe.function("sys_sigaction").return ?
{
	@_SYSCALL_SIGACTION_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.sigaction.return = kernel.trace("sys_exit")
{
	__set_syscall_pt_regs($regs)
	@__syscall_gate(@const("__NR_sigaction"))
	@_SYSCALL_SIGACTION_NAME
	@SYSC_RETVALSTR($ret)
}

# sigaction _________________________________________________________

probe syscall.sigaction32.return = dw_syscall.sigaction32.return !,
                                   nd_syscall.sigaction32.return ? {}

# dw_sigaction32 _____________________________________________________

probe dw_syscall.sigaction32 = kernel.function("sys32_sigaction").call ?,
			    kernel.function("compat_sys_sigaction").call ?
{
	@_SYSCALL_SIGACTION_NAME
	sig = __int32($sig)
	sig_str = _signal_name(sig)
	act_uaddr = @__pointer($act)
	act_str = _struct_old_sigaction32_u(act_uaddr)
	oact_uaddr = $oact
	@_SYSCALL_SIGACTION_ARGSTR
}
probe dw_syscall.sigaction32.return = kernel.function("sys32_sigaction").return ?,
				   kernel.function("compat_sys_sigaction").return ?
{
	@_SYSCALL_SIGACTION_NAME
	@SYSC_RETVALSTR($return)
}

# nd_sigaction32 _____________________________________________________

probe nd_syscall.sigaction32 = nd1_syscall.sigaction32!, nd2_syscall.sigaction32!, tp_syscall.sigaction32
  { }

probe nd1_syscall.sigaction32 = kprobe.function("sys32_sigaction") ?,
                                kprobe.function("compat_sys_sigaction") ?
{
	@_SYSCALL_SIGACTION_NAME
	asmlinkage()
	@_SYSCALL_SIGACTION32_REGARGS
	@_SYSCALL_SIGACTION_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.sigaction32 =
	kprobe.function(@arch_syscall_prefix "compat_sys_sigaction") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_SIGACTION_NAME
	@_SYSCALL_SIGACTION32_REGARGS
	@_SYSCALL_SIGACTION_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.sigaction32 = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__compat_syscall_gate(@const("__NR_compat_sigaction"))
	@_SYSCALL_SIGACTION_NAME
	@_SYSCALL_SIGACTION32_REGARGS
	@_SYSCALL_SIGACTION_ARGSTR
}

probe nd_syscall.sigaction32.return = nd1_syscall.sigaction32.return!, nd2_syscall.sigaction32.return!, tp_syscall.sigaction32.return
  { }

probe nd1_syscall.sigaction32.return = kprobe.function("sys32_sigaction").return ?,
                                       kprobe.function("compat_sys_sigaction").return ?
{
	@_SYSCALL_SIGACTION_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 4.17+ */
probe nd2_syscall.sigaction32.return =
	kprobe.function(@arch_syscall_prefix "compat_sys_sigaction").return ?
{
	@_SYSCALL_SIGACTION_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.sigaction32.return = kernel.trace("sys_exit")
{
	__set_syscall_pt_regs($regs)
	@__compat_syscall_gate(@const("__NR_compat_sigaction"))
	@_SYSCALL_SIGACTION_NAME
	@SYSC_RETVALSTR($ret)
}