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Filename : sysc_rt_sigpending.stp
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# rt_sigpending ______________________________________________
#
# long sys_rt_sigpending(sigset_t __user *set, size_t sigsetsize)
# COMPAT_SYSCALL_DEFINE2(rt_sigpending, compat_sigset_t __user *, uset,
#		compat_size_t, sigsetsize)
# asmlinkage long sys32_rt_sigpending(compat_sigset_t __user *set,
#				    compat_size_t sigsetsize)
#

@define _SYSCALL_RT_SIGPENDING_NAME
%(
	name = "rt_sigpending"
%)

@define _SYSCALL_RT_SIGPENDING_ARGSTR
%(
	argstr = sprintf("%p, %u", set_uaddr, sigsetsize)
%)

@define _SYSCALL_RT_SIGPENDING_REGARGS
%(
	set_uaddr = pointer_arg(1)
	sigsetsize = ulong_arg(2)
%)

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

# dw_rt_sigpending _____________________________________________________

probe dw_syscall.rt_sigpending = __syscall.rt_sigpending ?,
                              kernel.function("compat_sys_rt_sigpending").call !,
                              kernel.function("sys32_rt_sigpending").call ?
{
	@_SYSCALL_RT_SIGPENDING_NAME
	set_uaddr = @choose_defined($uset, $set)
	sigsetsize = @__compat_ulong($sigsetsize)
	@_SYSCALL_RT_SIGPENDING_ARGSTR
}
probe __syscall.rt_sigpending = kernel.function("sys_rt_sigpending").call ?
{
	@__syscall_gate(@const("__NR_rt_sigpending"))
}
probe dw_syscall.rt_sigpending.return = __syscall.rt_sigpending.return ?,
                                     kernel.function("compat_sys_rt_sigpending").return !,
                                     kernel.function("sys32_rt_sigpending").return ?
{
	@_SYSCALL_RT_SIGPENDING_NAME
	@SYSC_RETVALSTR($return)
}
probe __syscall.rt_sigpending.return =
	kernel.function("sys_rt_sigpending").return ?
{
	@__syscall_gate(@const("__NR_rt_sigpending"))
}

# nd_rt_sigpending _____________________________________________________

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

probe nd1_syscall.rt_sigpending = __nd1_syscall.rt_sigpending ?,
				  __nd1_syscall.compat_rt_sigpending ?
{
	@_SYSCALL_RT_SIGPENDING_NAME
	asmlinkage()
	@_SYSCALL_RT_SIGPENDING_REGARGS
	@_SYSCALL_RT_SIGPENDING_ARGSTR
}
probe __nd1_syscall.rt_sigpending = kprobe.function("sys_rt_sigpending") ?
{
	@__syscall_gate(@const("__NR_rt_sigpending"))
}
probe __nd1_syscall.compat_rt_sigpending =
	kprobe.function("compat_sys_rt_sigpending") !,
	kprobe.function("sys32_rt_sigpending") ?
{
}

/* kernel 4.17+ */
probe nd2_syscall.rt_sigpending =
	kprobe.function(@arch_syscall_prefix "sys_rt_sigpending") ?,
	kprobe.function(@arch_syscall_prefix "compat_sys_rt_sigpending") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_RT_SIGPENDING_NAME
	@_SYSCALL_RT_SIGPENDING_REGARGS
	@_SYSCALL_RT_SIGPENDING_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.rt_sigpending = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_rt_sigpending"), @const("__NR_compat_rt_sigpending"))
	@_SYSCALL_RT_SIGPENDING_NAME
	@_SYSCALL_RT_SIGPENDING_REGARGS
	@_SYSCALL_RT_SIGPENDING_ARGSTR
}

probe nd_syscall.rt_sigpending.return = nd1_syscall.rt_sigpending.return!, nd2_syscall.rt_sigpending.return!, tp_syscall.rt_sigpending.return
  { }
  
probe nd1_syscall.rt_sigpending.return =
	__nd1_syscall.rt_sigpending.return ?,
	__nd1_syscall.compat_rt_sigpending.return ?
{
	@_SYSCALL_RT_SIGPENDING_NAME
	@SYSC_RETVALSTR(returnval())
}
probe __nd1_syscall.rt_sigpending.return =
	kprobe.function("sys_rt_sigpending").return ?
{
	@__syscall_gate(@const("__NR_rt_sigpending"))
}
probe __nd1_syscall.compat_rt_sigpending.return =
	kprobe.function("compat_sys_rt_sigpending").return !,
	kprobe.function("sys32_rt_sigpending").return ?
{
}

/* kernel 4.17+ */
probe nd2_syscall.rt_sigpending.return =
	kprobe.function(@arch_syscall_prefix "sys_rt_sigpending").return ?,
	kprobe.function(@arch_syscall_prefix "compat_sys_rt_sigpending").return ?
{
	@_SYSCALL_RT_SIGPENDING_NAME
	@SYSC_RETVALSTR(returnval())
}
 
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.rt_sigpending.return = kernel.trace("sys_exit")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_rt_sigpending"), @const("__NR_compat_rt_sigpending"))
	@_SYSCALL_RT_SIGPENDING_NAME
	@SYSC_RETVALSTR($ret)
}