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Filename : sysc_open_by_handle_at.stp
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# open_by_handle_at ___________________________________________
#
# SYSCALL_DEFINE3(open_by_handle_at, int, mountdirfd,
#		struct file_handle __user *, handle,
#		int, flags)
# COMPAT_SYSCALL_DEFINE3(open_by_handle_at, int, mountdirfd,
#			     struct file_handle __user *, handle, int, flags)

@define _SYSCALL_OPEN_BY_HANDLE_AT_NAME
%(
	name = "open_by_handle_at"
%)

@define _SYSCALL_OPEN_BY_HANDLE_AT_ARGSTR
%(
	argstr = sprintf("%s, %p, %s", mount_dfd_str, handle_uaddr, flags_str)
%)

@define _SYSCALL_OPEN_BY_HANDLE_AT_REGARGS
%(
	mount_dfd = int_arg(1)
	mount_dfd_str = _dfd_str(mount_dfd)
	handle_uaddr = pointer_arg(2)
	flags = int_arg(3)
	flags_str = _sys_open_flag_str(flags)
%)

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

# dw_open_by_handle_at _____________________________________________________

probe dw_syscall.open_by_handle_at =
	kernel.function("sys_open_by_handle_at").call ?,
	kernel.function("compat_sys_open_by_handle_at").call ?
{
	@_SYSCALL_OPEN_BY_HANDLE_AT_NAME
	mount_dfd = __int32($mountdirfd)
	mount_dfd_str = _dfd_str(mount_dfd)
	handle_uaddr = @__pointer($handle)
	flags = __int32($flags)
	flags_str = _sys_open_flag_str(flags)
	@_SYSCALL_OPEN_BY_HANDLE_AT_ARGSTR
}
probe dw_syscall.open_by_handle_at.return =
	kernel.function("sys_open_by_handle_at").return ?,
	kernel.function("compat_sys_open_by_handle_at").return ?
{
	@_SYSCALL_OPEN_BY_HANDLE_AT_NAME
	@SYSC_RETVALSTR($return)
}

# nd_open_by_handle_at _____________________________________________________

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

probe nd1_syscall.open_by_handle_at = kprobe.function("sys_open_by_handle_at") ?,
	kprobe.function("compat_sys_open_by_handle_at") ?
{
	@_SYSCALL_OPEN_BY_HANDLE_AT_NAME
	asmlinkage()
	@_SYSCALL_OPEN_BY_HANDLE_AT_REGARGS
	@_SYSCALL_OPEN_BY_HANDLE_AT_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.open_by_handle_at =
	kprobe.function(@arch_syscall_prefix "sys_open_by_handle_at") ?,
	kprobe.function(@arch_syscall_prefix "compat_sys_open_by_handle_at") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_OPEN_BY_HANDLE_AT_NAME
	@_SYSCALL_OPEN_BY_HANDLE_AT_REGARGS
	@_SYSCALL_OPEN_BY_HANDLE_AT_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.open_by_handle_at = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_open_by_handle_at"),
			       @const("__NR_compat_open_by_handle_at"))
	@_SYSCALL_OPEN_BY_HANDLE_AT_NAME
	@_SYSCALL_OPEN_BY_HANDLE_AT_REGARGS
	@_SYSCALL_OPEN_BY_HANDLE_AT_ARGSTR
}

probe nd_syscall.open_by_handle_at.return = nd1_syscall.open_by_handle_at.return!, nd2_syscall.open_by_handle_at.return!, tp_syscall.open_by_handle_at.return
  { }
  
probe nd1_syscall.open_by_handle_at.return =
	kprobe.function("sys_open_by_handle_at").return ?,
	kprobe.function("compat_sys_open_by_handle_at").return ?
{
	@_SYSCALL_OPEN_BY_HANDLE_AT_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 4.17+ */
probe nd2_syscall.open_by_handle_at.return =
	kprobe.function(@arch_syscall_prefix "sys_open_by_handle_at").return ?,
	kprobe.function(@arch_syscall_prefix "compat_sys_open_by_handle_at").return ?
{
	@_SYSCALL_OPEN_BY_HANDLE_AT_NAME
	@SYSC_RETVALSTR(returnval())
}
 
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.open_by_handle_at.return = kernel.trace("sys_exit")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_open_by_handle_at"),
			       @const("__NR_compat_open_by_handle_at"))
	@_SYSCALL_OPEN_BY_HANDLE_AT_NAME
	@SYSC_RETVALSTR($ret)
}