One Hat Cyber Team

View File Name : sysc_open.stp

# open _______________________________________________________
# long sys_open(const char __user * filename, int flags, int mode)
# (obsolete) long sys32_open(const char * filename, int flags, int mode)
#

@define _SYSCALL_OPEN_NAME
%(
	name = "open"
%)

@define _SYSCALL_OPEN_ARGSTR
%(
	if (flags & @const("O_CREAT"))
		argstr = sprintf("%s, %s, %#o", filename, flags_str, mode)
	else
		argstr = sprintf("%s, %s", filename, flags_str)
%)

@define _SYSCALL_OPEN_REGARGS
%(
	filename = user_string_quoted(pointer_arg(1))
	filename_unquoted = user_string_nofault(pointer_arg(1))
	flags = int_arg(2)
	flags_str = _sys_open_flag_str(flags)
	mode = uint_arg(3)
%)

@define _SYSCALL_OPEN_REGARGS_STORE
%(
        if (@probewrite(filename_unquoted))
          set_user_string_arg(pointer_arg(1), filename_unquoted)

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

	if (@probewrite(mode))
	  set_uint_arg(3, mode)
%)

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

# dw_open _____________________________________________________

probe dw_syscall.open = __syscall.compat_open ?, __syscall.open
{
	@__syscall_compat_gate(@const("__NR_open"), @const("__NR_compat_open"))
	@_SYSCALL_OPEN_NAME
	flags = __int32($flags)
	flags_str = _sys_open_flag_str(flags)
	@_SYSCALL_OPEN_ARGSTR
}
probe __syscall.compat_open = kernel.function("compat_sys_open").call ?,
			      kernel.function("sys32_open").call ?
{
	// On some platforms, $filename and $mode are longs on the
	// kernel side. Truncate these down to 32 bits.
	filename = user_string_quoted(__uint32($filename))
	mode = __uint32($mode)
}
probe __syscall.open = kernel.function("sys_open").call
{
	filename = user_string_quoted($filename)
	mode = __uint32($mode)
}
probe dw_syscall.open.return = kernel.function("compat_sys_open").return ?,
                            kernel.function("sys32_open").return ?,
                            kernel.function("sys_open").return ?
{
	@__syscall_compat_gate(@const("__NR_open"), @const("__NR_compat_open"))
	@_SYSCALL_OPEN_NAME
	@SYSC_RETVALSTR($return)
}

# nd_open _____________________________________________________

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

probe nd1_syscall.open = kprobe.function("compat_sys_open") ?,
                         kprobe.function("sys32_open") ?,
                         kprobe.function("sys_open") ?
{
	@__syscall_compat_gate(@const("__NR_open"), @const("__NR_compat_open"))
	@_SYSCALL_OPEN_NAME
	asmlinkage()
	@_SYSCALL_OPEN_REGARGS
	@_SYSCALL_OPEN_ARGSTR
}

probe nd2_syscall.open = kprobe.function(@arch_syscall_prefix "compat_sys_open") ?,
                         kprobe.function(@arch_syscall_prefix "sys_open") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_OPEN_NAME
	@_SYSCALL_OPEN_REGARGS
	@_SYSCALL_OPEN_ARGSTR
},
{
        %( @_IS_SREG_KERNEL %? @_SYSCALL_OPEN_REGARGS_STORE %)
}

/* kernel 3.5+, but undesirable because of it affects all syscalls */
probe tp_syscall.open = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_open"), @const("__NR_compat_open"))
	@_SYSCALL_OPEN_NAME
	@_SYSCALL_OPEN_REGARGS
	@_SYSCALL_OPEN_ARGSTR
},
{
        %( @_IS_SREG_KERNEL %? @_SYSCALL_OPEN_REGARGS_STORE %)
}

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

probe nd1_syscall.open.return = kprobe.function("compat_sys_open").return ?,
                                kprobe.function("sys32_open").return ?,
                                kprobe.function("sys_open").return ?
{
	@__syscall_compat_gate(@const("__NR_open"), @const("__NR_compat_open"))
	@_SYSCALL_OPEN_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 4.17+ */
probe nd2_syscall.open.return = kprobe.function(@arch_syscall_prefix "compat_sys_open").return ?,
                                kprobe.function(@arch_syscall_prefix "sys_open").return ?
{
	@_SYSCALL_OPEN_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 3.5+, but undesirable because of it affects all syscalls */
probe tp_syscall.open.return = kernel.trace("sys_exit")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_open"), @const("__NR_compat_open"))
	@_SYSCALL_OPEN_NAME
	@SYSC_RETVALSTR($ret)
}