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# memfd_create _____________________________________________________
# long sys_memfd_create (const char __user* uname, unsigned int flags)

@define _SYSCALL_MEMFD_CREATE_NAME
%(
	name = "memfd_create"
%)

@define _SYSCALL_MEMFD_CREATE_ARGSTR
%(
	argstr = sprintf("%s, %s", uname, flags_str)
%)

@define _SYSCALL_MEMFD_CREATE_REGARGS
%(
	uname = user_string_quoted(pointer_arg(1))
	uname_unquoted = user_string_nofault(pointer_arg(1))
	flags = uint_arg(2)
	flags_str = _mfd_flags_str(uint_arg(2))
%)

@define _SYSCALL_MEMFD_CREATE_REGARGS_STORE
%(
        if (@probewrite(uname_unquoted))
          set_user_string_arg(pointer_arg(1), uname_unquoted)

	if (@probewrite(flags))
	  set_uint_arg(2, flags)
%)

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

# dw_memfd_create _____________________________________________________

probe dw_syscall.memfd_create = kernel.function("sys_memfd_create").call ?
{
	@_SYSCALL_MEMFD_CREATE_NAME
	uname = user_string_quoted($uname)
	flags = $flags
	flags_str = _mfd_flags_str($flags)
	@_SYSCALL_MEMFD_CREATE_ARGSTR
}
probe dw_syscall.memfd_create.return = kernel.function("sys_memfd_create").return ?
{
	@_SYSCALL_MEMFD_CREATE_NAME
	@SYSC_RETVALSTR($return)
}

# nd_memfd_create _____________________________________________________

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

probe nd1_syscall.memfd_create = kprobe.function("sys_memfd_create") ?
{
	@_SYSCALL_MEMFD_CREATE_NAME
	asmlinkage()
	@_SYSCALL_MEMFD_CREATE_REGARGS
	@_SYSCALL_MEMFD_CREATE_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.memfd_create = kprobe.function(@arch_syscall_prefix "sys_memfd_create") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_MEMFD_CREATE_NAME
	@_SYSCALL_MEMFD_CREATE_REGARGS
	@_SYSCALL_MEMFD_CREATE_ARGSTR
},
{
        %( @_IS_SREG_KERNEL %? @_SYSCALL_MEMFD_CREATE_REGARGS_STORE %)
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.memfd_create = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_memfd_create"), @const("__NR_compat_memfd_create"))
	@_SYSCALL_MEMFD_CREATE_NAME
	@_SYSCALL_MEMFD_CREATE_REGARGS
	@_SYSCALL_MEMFD_CREATE_ARGSTR
},
{
        %( @_IS_SREG_KERNEL %? @_SYSCALL_MEMFD_CREATE_REGARGS_STORE %)
}

probe nd_syscall.memfd_create.return = nd1_syscall.memfd_create.return!, nd2_syscall.memfd_create.return!, tp_syscall.memfd_create.return
  { }
  
probe nd1_syscall.memfd_create.return = kprobe.function("sys_memfd_create").return ?
{
	@_SYSCALL_MEMFD_CREATE_NAME
	@SYSC_RETVALSTR(returnval())
}

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